SpringMVC中关于表单传值问题

在SpringMVC中，表单传值主要有3中方式
首先假设表单的JSP界面如下：

 
  
        
   
   
     
     账号 
        
     
     
     密码  
      
   
    
    
 
  
1.直接在对应的控制器的方法形参中加入表单参数，如下：
@RequestMapping("/addUser1")  
    public String addUser1(String userName,String password) {  
        System.out.println("userName is:"+userName);  
        System.out.println("password is:"+password);  
        return "/user/success";  
    }  
2.通过HttpServletRequest的getParam方法进行获取，如下：
@RequestMapping("/addUser2")  
    public String addUser2(HttpServletRequest request) {  
        String userName = request.getParameter("userName");  
        String password = request.getParameter("password");  
        System.out.println("userName is:"+userName);  
        System.out.println("password is:"+password);  
        return "/user/success";  
    }
3.通过一个Javabean进行封装，如下：
//封装的类
public class User {  
      
    private String userName;  
      
    private String password;  
  
    public String getUserName() {  
        return userName;  
    }  
  
    public void setUserName(String userName) {  
        this.userName = userName;  
    }  
  
    public String getPassword() {  
        return password;  
    }  
  
    public void setPassword(String password) {  
        this.password = password;  
    }  
}  
@RequestMapping("/addUser3")  
    public String addUser3(User user) {  
        System.out.println("userName is:"+user.getUserName());  
        System.out.println("password is:"+user.getPassword());  
        return "/user/success";  
    }  
4.json格式封装