1.MVC介绍

mvc全类名是Model View Controller,是模型（model）-视图（view）-控制器（controller）的缩写，它是一种软件设计典范，是一种软件框架设计分层模式。

Model:是应用程序中处于处理应用程序数据逻辑的部分

View:是应用程序中处理数据显示的部分。

Controller:是应用程序中处理用户交互的部分。

 

最典型的MVC就是：JSP+Servlet+javabean模式。

 

2.MVC发展历史

• Model 1(jsp+javabean)
• Model 2(jsp+servlet+javabean)

目前市场上的MVC框架

• 3.1SpringMVC(主流MVC框架)：是spring框架的一部分（子框架），是实现对servlet技术进行封装。
• 3.2Struts
• 3.3Jfinal

1.SpringMVC运行原理（执行过程）

整理流程

具体步骤：

1、  首先用户发送请求到前端控制器，前端控制器根据请求信息（如 URL）来决定选择哪一个页面控制器进行处理并把请求委托给它，即以前的控制器的控制逻辑部分；图中的 1、2 步骤；

2、  页面控制器接收到请求后，进行功能处理，首先需要收集和绑定请求参数到一个对象，这个对象在 Spring Web MVC 中叫命令对象，并进行验证，然后将命令对象委托给业务对象进行处理；处理完毕后返回一个 ModelAndView（模型数据和逻辑视图名）；图中的 3、4、5 步骤；

3、  前端控制器收回控制权，然后根据返回的逻辑视图名，选择相应的视图进行渲染，并把模型数据传入以便视图渲染；图中的步骤 6、7；

4、  前端控制器再次收回控制权，将响应返回给用户，图中的步骤 8；至此整个结束。

核心流程

具体步骤：

第一步：发起请求到前端控制器(DispatcherServlet)

第二步：前端控制器请求HandlerMapping查找 Handler （可以根据xml配置、注解进行查找）

第三步：处理器映射器HandlerMapping向前端控制器返回Handler，HandlerMapping会把请求映射为HandlerExecutionChain对象（包含一个Handler处理器（页面控制器）对象，多个HandlerInterceptor拦截器对象），通过这种策略模式，很容易添加新的映射策略

第四步：前端控制器调用处理器适配器去执行Handler

第五步：处理器适配器HandlerAdapter将会根据适配的结果去执行Handler

第六步：Handler执行完成给适配器返回ModelAndView

第七步：处理器适配器向前端控制器返回ModelAndView （ModelAndView是springmvc框架的一个底层对象，包括 Model和view）

第八步：前端控制器请求视图解析器去进行视图解析 （根据逻辑视图名解析成真正的视图(jsp)），通过这种策略很容易更换其他视图技术，只需要更改视图解析器即可

第九步：视图解析器向前端控制器返回View

第十步：前端控制器进行视图渲染 （视图渲染将模型数据(在ModelAndView对象中)填充到request域）

第十一步：前端控制器向用户响应结果

(此处参考https://www.cnblogs.com/leskang/p/6101368.html)

  在SpringMVC 中，控制器Controller 负责处理由DispatcherServlet 分发的请求，它把用户请求的数据经过业务处理层处理之后封装成一个Model ，然后再把该Model 返回给对应的View 进行展示。在SpringMVC 中提供了一个非常简便的定义Controller 的方法，你无需继承特定的类或实现特定的接口，只需使用@Controller 标记一个类是Controller ，然后使用@RequestMapping 和@RequestParam 等一些注解用以定义URL 请求和Controller 方法之间的映射，这样的Controller 就能被外界访问到。此外Controller 不会直接依赖于HttpServletRequest 和HttpServletResponse 等HttpServlet 对象，它们可以通过Controller 的方法参数灵活的获取到。

2.需求：

用户提交一个请求，服务端处理器接收到请求后，给出一条信息，在相应页面中显示该条信息

package com.bjsxt.handlers;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import org.springframework.web.servlet.ModelAndView;import org.springframework.web.servlet.mvc.Controller;//后端控制器public class MyController implements Controller {    @Override    public ModelAndView handleRequest(HttpServletRequest request, HttpServletResponse response) throws Exception {        ModelAndView mv = new ModelAndView();        System.out.println("进入到后端控制器方法！");        mv.addObject("msg", "Hello SpringMVC!");        mv.setViewName("/jsp/welcome.jsp");        return mv;    }}

      
        
       
        springmvc-01-primary
         
           
        
         index.jsp
          
         
         
             
        
         springmvc
              
        
         org.springframework.web.servlet.DispatcherServlet
              
              
                  
         
          contextConfigLocation
                   
         
          classpath:springmvc.xml
               
          
         
             
        
         springmvc
              
        
         *.do
          
       
      

<%@ page language="java" contentType="text/html; charset=UTF-8"    pageEncoding="UTF-8"%>
          ${msg}

 

配置式开发

3.开发步骤

3.1导入jar包

 

3.2配置web.xml，注册SpringMVC前端控制器（中央调度器）

      
        
       
        springmvc-01-primary
         
           
        
         index.jsp
          
         
         
             
        
         springmvc
              
        
         org.springframework.web.servlet.DispatcherServlet
              
              
                  
         
          contextConfigLocation
                   
         
          classpath:springmvc.xml
               
          
         
             
        
         springmvc
              
        
         *.do
          
       
      

3.3编写SpringMVC后端控制器

package com.bjsxt.handlers;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import org.springframework.web.servlet.ModelAndView;import org.springframework.web.servlet.mvc.Controller;//后端控制器public class MyController implements Controller {    @Override    public ModelAndView handleRequest(HttpServletRequest request, HttpServletResponse response) throws Exception {        ModelAndView mv = new ModelAndView();        System.out.println("进入到后端控制器方法！");        mv.addObject("msg", "Hello SpringMVC!");        mv.setViewName("/jsp/welcome.jsp");        return mv;    }}

3.4编写springmvc配置文件，注册后端控制器（注意id写法格式）

3.5编写跳转资源页面

<%@ page language="java" contentType="text/html; charset=UTF-8"    pageEncoding="UTF-8"%>
          ${msg}

 

 

4.web.xml中urlpattern配置问题

4.1配置/和配置/*的区别

• /：拦截静态资源
• /*：会报错，所有资源都会拦截包括zip资源。

4.2静态资源无法访问解决方案（三种）

 第一种方案：

web.xml中配置

 

第二种解决方案：

• 在springmvc.xml下直接加入：<mvc:default-servlet-handler/>

第三种

• 在springmvc.xml下直接加入：
• <mvc:resources location="/images/"  mapping="/images/**"></mvc:resources>   //该路径下的所有资源都能访问到

 web.xml

      
        
       
        springmvc-01-primary
         
           
        
         index.jsp
          
         
         
         
         
             
        
         springmvc
              
        
         org.springframework.web.servlet.DispatcherServlet
              
              
                  
         
          contextConfigLocation
                   
         
          classpath:springmvc.xml
               
          
         
             
        
         springmvc
              
        
         /
          
       
      

springmvc.xml

controller

package com.bjsxt.handlers;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import org.springframework.web.servlet.ModelAndView;import org.springframework.web.servlet.mvc.Controller;//后端控制器public class MyController implements Controller {    @Override    public ModelAndView handleRequest(HttpServletRequest request, HttpServletResponse response) throws Exception {        ModelAndView mv = new ModelAndView();        System.out.println("进入到后端控制器方法！");        mv.addObject("msg", "Hello SpringMVC!");        mv.setViewName("/jsp/welcome.jsp");        return mv;    }}

 

注解式开发

1.搭建环境

 

• 1.1 后端控制器无需实现接口,添加相应注解
• 1.2 springmvc配置文件无需注册controller
• 1.3 springmvc配置文件中添加组件扫描器、注解驱动

        <mvc:annotation-driven /> 会自动注册DefaultAnnotationHandlerMapping与AnnotationMethodHandlerAdapter 两个bean,

         并提供了：数据绑定支持，@NumberFormatannotation支持，@DateTimeFormat支持，@Valid支持，读写XML的支持（JAXB），读写JSON的支持                  

        （Jackson）等等。

 

2.涉及常用注解

• @Controller、@RequestMapping(类体上【命名空间】、方法上)、@Scope

 

 <mvc:annotation-driven>:提供数据绑定支持，xml读写,json支持。

 

controller

package com.bjsxt.handlers;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import org.springframework.context.annotation.Scope;import org.springframework.stereotype.Controller;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.servlet.ModelAndView;//后端控制器@Controller //该注解表将当前类交给spring容器管理@Scope("prototype")@RequestMapping("/springmvc")  //该注解起到限定范围的作用public class MyController{    @RequestMapping("/hadleRequest")    public ModelAndView handleRequest(HttpServletRequest request, HttpServletResponse response) throws Exception {        ModelAndView mv = new ModelAndView();        System.out.println("进入到后端控制器方法！");        mv.addObject("msg", "Hello SpringMVC!");        mv.setViewName("/jsp/welcome.jsp");        return mv;    }}

springmvc.xml

web.xml

      
        
       
        springmvc-01-primary
         
           
        
         index.jsp
          
         
         
         
         
             
        
         springmvc
              
        
         org.springframework.web.servlet.DispatcherServlet
              
              
                  
         
          contextConfigLocation
                   
         
          classpath:springmvc.xml
               
          
         
             
        
         springmvc
              
        
         /
          
       
      

 

 

 

 

 

 

 

3.视图解析器（前缀、后缀）

package com.bjsxt.handlers;import org.springframework.context.annotation.Scope;import org.springframework.stereotype.Controller;import org.springframework.web.bind.annotation.RequestMapping;//后端控制器@Controller //该注解表将当前类交给spring容器管理@Scope("prototype")@RequestMapping("/springmvc")  //该注解起到限定范围的作用public class MyController{    @RequestMapping("/hello")    public String hello(){        return "welcome";    }}

      
        
       
        springmvc-01-primary
         
           
        
         index.jsp
          
         
         
         
         
             
        
         springmvc
              
        
         org.springframework.web.servlet.DispatcherServlet
              
              
                  
         
          contextConfigLocation
                   
         
          classpath:springmvc.xml
               
          
         
             
        
         springmvc
              
        
         /
          
       
      

 

4.处理器方法常用的参数（五类）

 

4.1 HttpServletRequest

4.2 HttpServletResponse

4.3 HttpSession

4.4 用于承载数据的Model、Map、ModelMap【代码示例】

4.5 请求中所携带的请求参数

 无

 

5.接收请求参数

5.1 逐个接收 (涉及注解@RequestParam)

前提：处理器名和index.jsp的值必须一致，才能接收。

解决办法：

public ModelAndView hello(@RequestParam("username") String name,int age)

package com.bjsxt.handlers;import org.springframework.context.annotation.Scope;import org.springframework.stereotype.Controller;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.RequestParam;import org.springframework.web.servlet.ModelAndView;//后端控制器@Controller //该注解表将当前类交给spring容器管理@Scope("prototype")@RequestMapping("/springmvc")  //该注解起到限定范围的作用public class MyController{    @RequestMapping("/hello")    public ModelAndView hello(@RequestParam("username") String name,int age){        ModelAndView modelAndView = new ModelAndView();        modelAndView.addObject("username", name);        modelAndView.addObject("age", age);        modelAndView.setViewName("welcome");        return modelAndView;    }}

      
        
       
        springmvc-01-primary
         
           
        
         index.jsp
          
         
         
         
         
             
        
         springmvc
              
        
         org.springframework.web.servlet.DispatcherServlet
              
              
                  
         
          contextConfigLocation
                   
         
          classpath:springmvc.xml
               
          
         
             
        
         springmvc
              
        
         /
          
       
      

 

5.2 以对象形式整体接收

package com.bjsxt.handlers;import org.springframework.context.annotation.Scope;import org.springframework.stereotype.Controller;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.RequestParam;import org.springframework.web.servlet.ModelAndView;import com.bjsxt.pojo.Star;//后端控制器@Controller //该注解表将当前类交给spring容器管理@Scope("prototype")@RequestMapping("/springmvc")  //该注解起到限定范围的作用public class MyController{    @RequestMapping("/hello")    public ModelAndView hello(Star star){        ModelAndView modelAndView = new ModelAndView();        modelAndView.addObject("username", star.getUsername());        modelAndView.addObject("age", star.getAge());        modelAndView.setViewName("welcome");        return modelAndView;    }}

package com.bjsxt.pojo;public class Star {    private String username;    private int age;    public String getUsername() {        return username;    }    public void setUsername(String username) {        this.username = username;    }    public int getAge() {        return age;    }    public void setAge(int age) {        this.age = age;    }        }

      
        
       
        springmvc-01-primary
         
           
        
         index.jsp
          
         
         
         
         
             
        
         springmvc
              
        
         org.springframework.web.servlet.DispatcherServlet
              
              
                  
         
          contextConfigLocation
                   
         
          classpath:springmvc.xml
               
          
         
             
        
         springmvc
              
        
         /
          
       
      

<%@ page language="java" contentType="text/html; charset=UTF-8"    pageEncoding="UTF-8"%>
          
      
        
       
       
        
       
       
        
           
      

 

 

5.3 域属性参数的接收

<%@ page language="java" contentType="text/html; charset=UTF-8"    pageEncoding="UTF-8"%>
          
      
               用户名：
       
       
        年龄：
       
       
        伴侣名称：
       
       
        
           
      

      
        
       
        springmvc-01-primary
         
           
        
         index.jsp
          
         
         
         
         
             
        
         springmvc
              
        
         org.springframework.web.servlet.DispatcherServlet
              
              
                  
         
          contextConfigLocation
                   
         
          classpath:springmvc.xml
               
          
         
             
        
         springmvc
              
        
         /
          
       
      

package com.bjsxt.handlers;import org.springframework.context.annotation.Scope;import org.springframework.stereotype.Controller;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.RequestParam;import org.springframework.web.servlet.ModelAndView;import com.bjsxt.pojo.Star;//后端控制器@Controller //该注解表将当前类交给spring容器管理@Scope("prototype")@RequestMapping("/springmvc")  //该注解起到限定范围的作用public class MyController{    @RequestMapping("/hello")    public ModelAndView hello(Star star){        ModelAndView modelAndView = new ModelAndView();        modelAndView.addObject("username", star.getUsername());        modelAndView.addObject("age", star.getAge());        modelAndView.addObject("partnerName", star.getParter().getName());        modelAndView.setViewName("welcome");        return modelAndView;    }}

package com.bjsxt.pojo;public class Star {    private String username;    private int age;        //域属性，也称为对象属性    private Parter parter;        public Parter getParter() {        return parter;    }    public void setParter(Parter parter) {        this.parter = parter;    }    public String getUsername() {        return username;    }    public void setUsername(String username) {        this.username = username;    }    public int getAge() {        return age;    }    public void setAge(int age) {        this.age = age;    }        }

package com.bjsxt.pojo;public class Parter {    private String name;    public String getName() {        return name;    }    public void setName(String name) {        this.name = name;    }    }

 

5.4 数组或集合参数的接收

package com.bjsxt.handlers;import java.util.List;import org.springframework.context.annotation.Scope;import org.springframework.stereotype.Controller;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.RequestParam;import org.springframework.web.servlet.ModelAndView;import com.bjsxt.pojo.Star;//后端控制器@Controller //该注解表将当前类交给spring容器管理@Scope("prototype")@RequestMapping("/springmvc")  //该注解起到限定范围的作用public class MyController{    //数组接收参数    /*    @RequestMapping("/hello")    public void  hello(String[] interest){        for (String string : interest) {            System.out.println(string);        }    }    */    //集合接收参数    @RequestMapping("/hello")    public void  hello1(@RequestParam List
      
        interest){        for (String string : interest) {            System.out.println(string);        }    }}
      

package com.bjsxt.pojo;public class Parter {    private String name;    public String getName() {        return name;    }    public void setName(String name) {        this.name = name;    }    }

package com.bjsxt.pojo;public class Star {    private String username;    private int age;        //域属性，也称为对象属性    private Parter parter;        public Parter getParter() {        return parter;    }    public void setParter(Parter parter) {        this.parter = parter;    }    public String getUsername() {        return username;    }    public void setUsername(String username) {        this.username = username;    }    public int getAge() {        return age;    }    public void setAge(int age) {        this.age = age;    }        }

      
        
       
        springmvc-01-primary
         
           
        
         index.jsp
          
         
         
         
         
             
        
         springmvc
              
        
         org.springframework.web.servlet.DispatcherServlet
              
              
                  
         
          contextConfigLocation
                   
         
          classpath:springmvc.xml
               
          
         
             
        
         springmvc
              
        
         /
          
       
      

<%@ page language="java" contentType="text/html; charset=UTF-8"    pageEncoding="UTF-8"%>
          
      
        
       a1
       
        
       a2
       
        
       a3
       
        
           
      

 

5.5 restfull风格,传参（涉及注解@ PathVariable）

package com.bjsxt.handlers;import org.springframework.context.annotation.Scope;import org.springframework.stereotype.Controller;import org.springframework.web.bind.annotation.PathVariable;import org.springframework.web.bind.annotation.RequestMapping;//后端控制器@Controller //该注解表将当前类交给spring容器管理@Scope("prototype")@RequestMapping("/springmvc")  //该注解起到限定范围的作用public class MyController{    //restful风格传参    @RequestMapping("/{name}/{age}/hello")    public void  hello1(@PathVariable String name,@PathVariable int age){            System.out.println(name+age);    }}

package com.bjsxt.pojo;public class Star {    private String username;    private int age;        //域属性，也称为对象属性    private Parter parter;        public Parter getParter() {        return parter;    }    public void setParter(Parter parter) {        this.parter = parter;    }    public String getUsername() {        return username;    }    public void setUsername(String username) {        this.username = username;    }    public int getAge() {        return age;    }    public void setAge(int age) {        this.age = age;    }        }

package com.bjsxt.pojo;public class Parter {    private String name;    public String getName() {        return name;    }    public void setName(String name) {        this.name = name;    }    }

      
        
       
        springmvc-01-primary
         
           
        
         index.jsp
          
         
         
         
         
             
        
         springmvc
              
        
         org.springframework.web.servlet.DispatcherServlet
              
              
                  
         
          contextConfigLocation
                   
         
          classpath:springmvc.xml
               
          
         
             
        
         springmvc
              
        
         /
          
       
      

 

5.6 接收json字符串（涉及注解@RequestBody,注册mvc注解驱动，导入jackson包）

6.获取请求头中参数(涉及注解@RequestHeader)

 

<%@ page language="java" contentType="text/html; charset=UTF-8"    pageEncoding="UTF-8"%>
          点击我呀！

package com.bjsxt.handlers;import org.springframework.context.annotation.Scope;import org.springframework.stereotype.Controller;import org.springframework.web.bind.annotation.RequestHeader;import org.springframework.web.bind.annotation.RequestMapping;//后端控制器@Controller //该注解表将当前类交给spring容器管理@Scope("prototype")@RequestMapping("/springmvc")  //该注解起到限定范围的作用public class MyController{    //接收json字符串并封装成对象    @RequestMapping("/hello")    public void  hello1(@RequestHeader String host,@RequestHeader String cookie){        System.out.println(host + " ----------"+cookie);    }}

package com.bjsxt.pojo;public class Star {    private String username;    private int age;        //域属性，也称为对象属性    private Parter parter;        public Parter getParter() {        return parter;    }    public void setParter(Parter parter) {        this.parter = parter;    }    public String getUsername() {        return username;    }    public void setUsername(String username) {        this.username = username;    }    public int getAge() {        return age;    }    public void setAge(int age) {        this.age = age;    }    @Override    public String toString() {        return "Star [username=" + username + ", age=" + age + ", parter=" + parter + "]";    }            }

package com.bjsxt.pojo;public class Parter {    private String name;    public String getName() {        return name;    }    public void setName(String name) {        this.name = name;    }    }

 

处理器方法的返回值

 

7.1 ModelAndView

7.2 String

<%@ page language="java" contentType="text/html; charset=UTF-8"    pageEncoding="UTF-8"%>
          
      
               姓名：
       
       
        年龄：
       
       
        
       
       
    
      

package com.bjsxt.handlers;import java.util.Map;import org.springframework.context.annotation.Scope;import org.springframework.stereotype.Controller;import org.springframework.ui.Model;import org.springframework.ui.ModelMap;import org.springframework.web.bind.annotation.RequestHeader;import org.springframework.web.bind.annotation.RequestMapping;//后端控制器@Controller //该注解表将当前类交给spring容器管理@Scope("prototype")@RequestMapping("/springmvc")  //该注解起到限定范围的作用public class MyController{    //接收json字符串并封装成对象    @RequestMapping("/hello")    public String  hello1(String username,int age,Model model,Map
      
        map,ModelMap modelMap){        System.out.println(username + " ----------"+age);        model.addAttribute("username", username);        map.put("age", age);        modelMap.addAttribute("gender", "female");        return "welcome";    }}
      

package com.bjsxt.pojo;public class Parter {    private String name;    public String getName() {        return name;    }    public void setName(String name) {        this.name = name;    }    }

package com.bjsxt.pojo;public class Star {    private String username;    private int age;        //域属性，也称为对象属性    private Parter parter;        public Parter getParter() {        return parter;    }    public void setParter(Parter parter) {        this.parter = parter;    }    public String getUsername() {        return username;    }    public void setUsername(String username) {        this.username = username;    }    public int getAge() {        return age;    }    public void setAge(int age) {        this.age = age;    }    @Override    public String toString() {        return "Star [username=" + username + ", age=" + age + ", parter=" + parter + "]";    }            }

<%@ page language="java" contentType="text/html; charset=UTF-8"    pageEncoding="UTF-8"%>
          欢迎页面！${username}--${age}--${gender}

 

package com.bjsxt.handlers;import org.springframework.context.annotation.Scope;import org.springframework.stereotype.Controller;import org.springframework.web.bind.annotation.PathVariable;import org.springframework.web.bind.annotation.RequestBody;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.ResponseBody;import com.bjsxt.pojo.Star;//后端控制器@Controller //该注解表将当前类交给spring容器管理@Scope("prototype")@RequestMapping("/springmvc")  //该注解起到限定范围的作用public class MyController{    //接收json字符串并封装成对象    @RequestMapping(value="/hello",produces="text/html;charset=utf-8")    @ResponseBody    public String  hello1(){        return "china:瓷器";    }}

 

7.3 void

<%@ page language="java" contentType="text/html; charset=UTF-8"    pageEncoding="UTF-8"%>
          点击我呀！

package com.bjsxt.handlers;import java.io.IOException;import javax.servlet.http.HttpServletResponse;import org.springframework.context.annotation.Scope;import org.springframework.stereotype.Controller;import org.springframework.web.bind.annotation.PathVariable;import org.springframework.web.bind.annotation.RequestBody;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.ResponseBody;import com.bjsxt.pojo.Star;//后端控制器@Controller //该注解表将当前类交给spring容器管理@Scope("prototype")@RequestMapping("/springmvc")  //该注解起到限定范围的作用public class MyController{    //接收json字符串并封装成对象    @RequestMapping(value="/hello",produces="text/html;charset=utf-8")    public void  hello1(HttpServletResponse response) throws IOException{        String json="{\"name\":\"weilong\",\"flavor\":\"hot\"}";        response.getWriter().print(json);    }}

package com.bjsxt.pojo;public class Parter {    private String name;    public String getName() {        return name;    }    public void setName(String name) {        this.name = name;    }    }

package com.bjsxt.pojo;public class Star {    private String username;    private int age;        //域属性，也称为对象属性    private Parter parter;        public Parter getParter() {        return parter;    }    public void setParter(Parter parter) {        this.parter = parter;    }    public String getUsername() {        return username;    }    public void setUsername(String username) {        this.username = username;    }    public int getAge() {        return age;    }    public void setAge(int age) {        this.age = age;    }    @Override    public String toString() {        return "Star [username=" + username + ", age=" + age + ", parter=" + parter + "]";    }            }

 

7.4 Object(涉及注解@ResponseBody ,注册mvc注解驱动，导入jackson2.5包)

8.请求转发与重定向

<%@ page language="java" contentType="text/html; charset=UTF-8"    pageEncoding="UTF-8"%>
          
      
        
       
       
        
       
       
        
           
      

package com.bjsxt.handlers;import org.springframework.context.annotation.Scope;import org.springframework.stereotype.Controller;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.RequestParam;import org.springframework.web.servlet.ModelAndView;//后端控制器@Controller //该注解表将当前类交给spring容器管理@Scope("prototype")@RequestMapping("/springmvc")  //该注解起到限定范围的作用public class MyController{    @RequestMapping("/hello")    public ModelAndView hello(String username,int age){        ModelAndView modelAndView = new ModelAndView();        modelAndView.addObject("username", username);        modelAndView.addObject("age", age);        modelAndView.setViewName("redirect:some");        return modelAndView;    }    @RequestMapping("/some")    public ModelAndView some(){        ModelAndView modelAndView = new ModelAndView();        modelAndView.setViewName("welcome");        return modelAndView;    }}

      
        
       
        springmvc-01-primary
         
           
        
         index.jsp
          
         
         
         
         
             
        
         springmvc
              
        
         org.springframework.web.servlet.DispatcherServlet
              
              
                  
         
          contextConfigLocation
                   
         
          classpath:springmvc.xml
               
          
         
             
        
         springmvc
              
        
         /
          
       
      

 

package com.bjsxt.handlers;import org.springframework.context.annotation.Scope;import org.springframework.stereotype.Controller;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.RequestParam;import org.springframework.web.servlet.ModelAndView;//后端控制器@Controller //该注解表将当前类交给spring容器管理@Scope("prototype")@RequestMapping("/springmvc")  //该注解起到限定范围的作用public class MyController{    @RequestMapping("/hello")    public ModelAndView hello(String username,int age){        ModelAndView modelAndView = new ModelAndView();        modelAndView.addObject("username", username);        modelAndView.addObject("age", age);        modelAndView.setViewName("redirect:/jsp/welcome.jsp");        return modelAndView;    }}

 

9.文件上传(注册mvc注解驱动、文件上传解析器,导入相关jar包)

<%@ page language="java" contentType="text/html; charset=UTF-8"    pageEncoding="UTF-8"%>
          
      
        
       
       
        
           
      

      
        
       
        springmvc-01-primary
         
           
        
         index.jsp
          
         
         
         
         
             
        
         springmvc
              
        
         org.springframework.web.servlet.DispatcherServlet
              
              
                  
         
          contextConfigLocation
                   
         
          classpath:springmvc.xml
               
          
         
             
        
         springmvc
              
        
         /
          
       
      

package com.bjsxt.handlers;import java.io.File;import java.io.IOException;import org.springframework.context.annotation.Scope;import org.springframework.stereotype.Controller;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.multipart.MultipartFile;import org.springframework.web.servlet.ModelAndView;//后端控制器@Controller //该注解表将当前类交给spring容器管理@Scope("prototype")@RequestMapping("/springmvc")  //该注解起到限定范围的作用public class MyController{    @RequestMapping("/fileUpload")    public String fileUpload(MultipartFile img){        String path="d:/";        String fileName = img.getOriginalFilename();        File file = new File(path, fileName );        try {            img.transferTo(file);        } catch (IllegalStateException e) {            e.printStackTrace();        } catch (IOException e) {            e.printStackTrace();        }                return "welcome";    }}

 

<%@ page language="java" contentType="text/html; charset=UTF-8"    pageEncoding="UTF-8"%>
          
      
        
       
       
        
       
       
        
       
       
        
           
      

package com.bjsxt.handlers;import java.io.File;import java.io.IOException;import javax.servlet.http.HttpSession;import org.springframework.context.annotation.Scope;import org.springframework.stereotype.Controller;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.RequestParam;import org.springframework.web.multipart.MultipartFile;import org.springframework.web.servlet.ModelAndView;//后端控制器@Controller //该注解表将当前类交给spring容器管理@Scope("prototype")@RequestMapping("/springmvc")  //该注解起到限定范围的作用public class MyController{    @RequestMapping("/fileUpload")    public String fileUpload(@RequestParam MultipartFile[] imgs,HttpSession session){        String path=session.getServletContext().getRealPath("/");        for (MultipartFile img : imgs) {            String fileName = img.getOriginalFilename();            File file = new File(path, fileName );            try {                img.transferTo(file);            } catch (IllegalStateException e) {                e.printStackTrace();            } catch (IOException e) {                e.printStackTrace();            }        }                        return "welcome";    }}

 

10.文件下载

 

<%@ page language="java" contentType="text/html; charset=UTF-8"    pageEncoding="UTF-8"%>
          点击下载

      
        
       
        springmvc-01-primary
         
           
        
         index.jsp
          
         
         
         
         
             
        
         springmvc
              
        
         org.springframework.web.servlet.DispatcherServlet
              
              
                  
         
          contextConfigLocation
                   
         
          classpath:springmvc.xml
               
          
         
             
        
         springmvc
              
        
         /
          
       
      

package com.bjsxt.handlers;import java.io.File;import java.io.FileInputStream;import java.io.IOException;import java.io.InputStream;import org.springframework.context.annotation.Scope;import org.springframework.http.HttpHeaders;import org.springframework.http.HttpStatus;import org.springframework.http.ResponseEntity;import org.springframework.stereotype.Controller;import org.springframework.web.bind.annotation.RequestMapping;//后端控制器@Controller //该注解表将当前类交给spring容器管理@Scope("prototype")@RequestMapping("/springmvc")  //该注解起到限定范围的作用public class MyController{    @RequestMapping("/fileDowload")    public ResponseEntity
      
        dowload() throws IOException{        //指定下载文件        File file = new File("d:/美女.png");        InputStream is = new FileInputStream(file);        //创建字节数组，并且设置数组大小为预估的文件字节数        byte[] body = new byte[is.available()];        //将输入流中字符存储到缓存数组中        is.read(body);        //获取下载显示的文件名，并解决中文乱码        String name = file.getName();        String downLoadFileName = new String(name.getBytes("UTF-8"),"ISO-8859-1");        //设置Http响应头信息，并且通知浏览器以附件的形式进行下载        HttpHeaders httpHeaders = new HttpHeaders();        httpHeaders.add("Content-Disposition", "attachment;filename="+downLoadFileName);        //设置Http响应状态信息        HttpStatus status = HttpStatus.OK;        ResponseEntity
       
         responseEntity = new ResponseEntity<>(body, httpHeaders, status);        return responseEntity;            }}
       
      

 

11.拦截器(实现HandlerInterceptor接口；注册拦截器<mvc:interceptors>)

package com.bjsxt.handlers;import java.util.Map;import org.springframework.context.annotation.Scope;import org.springframework.stereotype.Controller;import org.springframework.ui.Model;import org.springframework.ui.ModelMap;import org.springframework.web.bind.annotation.RequestHeader;import org.springframework.web.bind.annotation.RequestMapping;//后端控制器@Controller @Scope("prototype")@RequestMapping("/springmvc")  public class MyController{    @RequestMapping("/hello")    public String  hello1(String username,int age,Model model,Map
      
        map,ModelMap modelMap){        System.out.println(username + " ----------"+age);        model.addAttribute("username", username);        map.put("age", age);        modelMap.addAttribute("gender", "female");        return "welcome";    }    @RequestMapping("/hello2")    public String  hello2(String username,int age,Model model,Map
       
         map,ModelMap modelMap){        System.out.println(username + " 2222----------2222"+age);        model.addAttribute("username", username);        map.put("age", age);        modelMap.addAttribute("gender", "female");        return "welcome";    }}
       
      

package com.bjsxt.interceptors;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import org.springframework.web.servlet.HandlerInterceptor;import org.springframework.web.servlet.ModelAndView;//自定义拦截器public class FirstInterceptor implements HandlerInterceptor {    //该方法执行时机：处理器方法执行之前执行    @Override    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler)            throws Exception {        System.out.println("拦截器preHandle（）执行！");        return true;    }    //该方法执行时机：处理器方法执行之后执行    @Override    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler,            ModelAndView modelAndView) throws Exception {        System.out.println("拦截器postHandle()执行！");    }        //该方法执行时机：所有工作处理完成之后，响应给浏览器客户端之前执行    @Override    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex)            throws Exception {        System.out.println("拦截器afterCompletion()执行！");    }}

package com.bjsxt.pojo;public class Parter {    private String name;    public String getName() {        return name;    }    public void setName(String name) {        this.name = name;    }    }

package com.bjsxt.pojo;public class Star {    private String username;    private int age;        //域属性，也称为对象属性    private Parter parter;        public Parter getParter() {        return parter;    }    public void setParter(Parter parter) {        this.parter = parter;    }    public String getUsername() {        return username;    }    public void setUsername(String username) {        this.username = username;    }    public int getAge() {        return age;    }    public void setAge(int age) {        this.age = age;    }    @Override    public String toString() {        return "Star [username=" + username + ", age=" + age + ", parter=" + parter + "]";    }            }

<%@ page language="java" contentType="text/html; charset=UTF-8"    pageEncoding="UTF-8"%>
          
      
               姓名：
       
       
        年龄：
       
       
        
       
       
    
      

 

 

package com.bjsxt.interceptors;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import org.springframework.web.servlet.HandlerInterceptor;import org.springframework.web.servlet.ModelAndView;//自定义拦截器public class FirstInterceptor implements HandlerInterceptor {    //该方法执行时机：处理器方法执行之前执行    @Override    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler)            throws Exception {        System.out.println("First拦截器preHandle（）执行！");        return true;    }    //该方法执行时机：处理器方法执行之后执行    @Override    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler,            ModelAndView modelAndView) throws Exception {        System.out.println("First拦截器postHandle()执行！");    }        //该方法执行时机：所有工作处理完成之后，响应给浏览器客户端之前执行    @Override    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex)            throws Exception {        System.out.println("First拦截器afterCompletion()执行！");    }}

package com.bjsxt.interceptors;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import org.springframework.web.servlet.HandlerInterceptor;import org.springframework.web.servlet.ModelAndView;public class SecondInterceptor implements HandlerInterceptor {    @Override    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler)            throws Exception {        System.out.println("Second的preHandle()执行！");        return true;    }    @Override    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler,            ModelAndView modelAndView) throws Exception {        System.out.println("Second的postHandle()执行！");            }    @Override    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex)            throws Exception {        System.out.println("Second的afterCompletion()执行！");            }}

package com.bjsxt.handlers;import java.util.Map;import org.springframework.context.annotation.Scope;import org.springframework.stereotype.Controller;import org.springframework.ui.Model;import org.springframework.ui.ModelMap;import org.springframework.web.bind.annotation.RequestHeader;import org.springframework.web.bind.annotation.RequestMapping;//后端控制器@Controller @Scope("prototype")@RequestMapping("/springmvc")  public class MyController{    @RequestMapping("/hello2")    public String  hello2(String username,int age,Model model,Map
      
        map,ModelMap modelMap){        System.out.println(username + " 2222----------2222"+age);        model.addAttribute("username", username);        map.put("age", age);        modelMap.addAttribute("gender", "female");        return "welcome";    }}
      

package com.bjsxt.pojo;public class Parter {    private String name;    public String getName() {        return name;    }    public void setName(String name) {        this.name = name;    }    }

package com.bjsxt.pojo;public class Star {    private String username;    private int age;        //域属性，也称为对象属性    private Parter parter;        public Parter getParter() {        return parter;    }    public void setParter(Parter parter) {        this.parter = parter;    }    public String getUsername() {        return username;    }    public void setUsername(String username) {        this.username = username;    }    public int getAge() {        return age;    }    public void setAge(int age) {        this.age = age;    }    @Override    public String toString() {        return "Star [username=" + username + ", age=" + age + ", parter=" + parter + "]";    }            }

<%@ page language="java" contentType="text/html; charset=UTF-8"    pageEncoding="UTF-8"%>
          
      
               姓名：
       
       
        年龄：
       
       
        
       
       
    
      

看源码了解拦截器方法执行顺序。

12.Spring和SpringMVC父子容器关系

在Spring整体框架的核心概念中，容器是核心思想，就是用来管理Bean的整个生命周期的，

而在一个项目中，容器不一定只有一个，Spring中可以包括多个容器，而且容器有上下层关

系，目前最常见的一种场景就是在一个项目中引入Spring和SpringMVC这两个框架，那么它

其实就是两个容器，Spring是父容器，SpringMVC是其子容器，并且在Spring父容器中注册

的Bean对于SpringMVC容器中是可见的，而在SpringMVC容器中注册的Bean对于Spring父容器

中是不可见的，也就是子容器可以看见父容器中的注册的Bean，反之就不行