@RequestParam注解的使用

自SpringMVC4.2之后，RequestParam內部有4個參數：
1、String name;
2、String value;
3、boolean required;
4、String defaultValue;

源碼中name的別名是value，value的別名是name,

所以說name和value兩個屬性基本是等價的,都是獲取從前台傳入的參數

     
     
     
             
 
              
 
               
 
                
 
               
 
               
 
                

                  RequestParam來映射請求參數 
                
 
               
 
              
 
               
 
                
 
               
 
               
 
                

                  required表示是否必須,默認為 
                 true 
                
 
               
 
              
 
               
 
                
 
               
 
               
 
                

                  defaultValue請求參數的默認值 
                
 
               
 
             
    
    
    
            

     
     
     
             
 
              
 
               
 
                
 
               
 
               
 
                
 
                 @RequestMapping(value = 
                 "/testRequestParam") 
                
 
               
 
              
 
               
 
                
 
               
 
               
 
                
 
                 public String testRequestParam(@RequestParam(value="username")String un,@RequestParam(value = "age",required = false,defaultValue = "0") int age){ 
                
 
               
 
              
 
               
 
                
 
               
 
               
 
                

                  System.out.println( 
                 "testRequestParam,username:"+un+ 
                 ",age,"+age); 
                
 
               
 
              
 
               
 
                
 
               
 
               
 
                
 
                 return 
                 "success"; 
                
 
               
 
              
 
               
 
                
 
               
 
               
 
                

                  } 
                
 
               
 
             
    
    
    
            

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