@RequestParam加与不加的区别

 1 @RequestMapping("/list")  
 2 public String test(int userId) {  
 3        
 4     return "list";  
 5 }  
 6    
 7    
 8 @RequestMapping("/list")  
 9 public String test(@RequestParam int userId) {  
10        
11     return "list";  
12 }  

1 @RequestMapping("/list")  
2 public String test(@RequestParam(value = "userId", defaultValue = "0", required = false) int userId) {  
3        
4     return "list";  
5 }