SpringMVC（二）传值

1、HelloController.java

通过model.addAttribute(key,value)进行传值

package zttc.itat.controller;  
import org.springframework.stereotype.Controller;  
import org.springframework.web.bind.annotation.RequestMapping;  
  
@Controller  
public class HelloController{  
    //RequestMapping表示用哪个URL来对应  
    @RequestMapping{{"/hello","/"}}  
    public String hello(String username, Model model){  
           System.out.println("hello");  

           model.addAttribute("username", username);  
　　　　　　 model.addAttribute(username);//默认使用对象的类型作为key,即model.addAttribute("string",username)

　　　　　　 System.out.println(username);
           return "hello";  
     }   
    @RequestMapping{{"/welcome"}}  
     public String welcome(){  
           System.out.println("welcome");  
           return "welcome";  
      }   
}

2、hello.jsp

<head>  
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">  
<title></title>  
</head>  
<body>  
<h1>hello!! ${username}</h1>

<h2>hello!!!! ${string}</h2>

</body>

在客户端地址栏输入：localhost……/hello?username=value