@RequestParam注解的使用

自SpringMVC4.2之后，RequestParam内部有4个参数：
1、String name;
2、String value;
3、boolean required;
4、String defaultValue;

源码中name的别名是value，value的别名是name,

所以说name和value两个属性基本是等价的,都是获取从前台传入的参数

     
     
     
 
      
 
       
 
        
 
       
 
       
 
        

          RequestParam来映射请求参数 
        
 
       
 
      
 
       
 
        
 
       
 
       
 
        

          required表示是否必须,默认为 
         true 
        
 
       
 
      
 
       
 
        
 
       
 
       
 
        

          defaultValue请求参数的默认值 
        
 
       
 
     
    
    
    

     
     
     
 
      
 
       
 
        
 
       
 
       
 
        
 
         @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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