一、项目配置

1.建立java web项目

2.导入相关jar包

3.配置web.xml文件

     
       
      
       SpringMVC
        
          
       
        index.jsp
         
          
        
          
       
        springmvc
           
       
        org.springframework.web.servlet.DispatcherServlet
           
              
        
         contextConfigLocation
               
        
         classpath:springmvc_servlet.xml
            
         
          
           
       
        springmvc
            
       
        /
         
         
       
         
       
        encode
          
       
        org.springframework.web.filter.CharacterEncodingFilter
          
       
        true
        
                
                     
        
         encoding
                      
        
         UTF-8
                  
          
        
         
       
        encode
          
       
        /*
        
          
     

4.创建springmvc_servlet.xml配置文件

5.创建Controller

建包com.etc.controller

建类文件HelloController.java

package com.etc.controller;import org.springframework.stereotype.Controller;import org.springframework.web.bind.annotation.RequestMapping;@Controllerpublic class HelloController {    @RequestMapping(value="/welcome")  //welcome要访问的url地址    public  String  hello(){        System.out.println("hello,springmvc");        return "hello";  //hello是逻辑视图名,和后缀名组合一起构成视图名  /web-inf/jsp/hello.jsp    }}

6.创建视图

在WEB-INF下创建jsp文件夹，在文件下创建hello.jsp文件

7.在浏览器输入访问地址

http://localhost:8080/SpringMVC/welcome

二、参数传递

1.前台到后台

方法一 http://localhost:8080/SpringMVC/welcome?uname="333"

@RequestMapping(value="/welcome")  //welcome要访问的url地址    public  String  hello(String uname){
   //此时方法参数与传来参数名称一致        System.out.println("hello,springmvc"+uname);        return "hello";  //hello是逻辑视图名,和后缀名组合一起构成视图名  /web-inf/jsp/hello.jsp    }

方法二  http://localhost:8080/SpringMVC/welcome2?username="333"

@RequestMapping(value="/welcome2")  //welcome要访问的url地址    public  String  hello2(@RequestParam(value="username",required=false)String uname){        //此时方法参数value="username"与传来参数名称一致,required=false不传参uname为null        //required=false不传参出错        System.out.println("hello,springmvc"+uname);        return "hello";  //hello是逻辑视图名,和后缀名组合一起构成视图名  /web-inf/jsp/hello.jsp    }

 

2.后台向前台传参

方法一    http://localhost:8080/SpringMVC/welcome3?uname="333"

@RequestMapping(value="/welcome3")      public  String hello3(String  uname,Model model){        System.out.println("页面过来的参数是:"+uname);        model.addAttribute("username","张三");        return "hello";    }

前台获取

    后台传递的参数：${username} 
  

方法二 http://localhost:8080/SpringMVC/welcome4?uname="333"

@RequestMapping(value="/welcome4")      public  String hello4(String  uname,Map
     
       map){        System.out.println("页面过来的参数是:"+uname);        map.put("username","张三");        return "hello";    }
     

前台同上

方法三 http://localhost:8080/SpringMVC/welcome4?uname="333"

 

@RequestMapping(value="/welcome5")      public  ModelAndView hello5(String uname){        ModelAndView mv=new ModelAndView();        Users user=new Users();        user.setId(1);        user.setName("李红");        mv.addObject("username",uname);        mv.addObject(uname);        mv.addObject("user", user);                mv.setViewName("hello");        return mv;    }

 

前台

    后台传递的参数：${username} 
    ${string}
    ${user.name }