springmvc GET POST 接受參數方式

通過@PathVariabl註解獲取路徑中傳遞參數 
JAVA 
1     @RequestMapping(value = "/{id}/{str}") 
2     public ModelAndView helloWorld(@PathVariable String id, 
3             @PathVariable String str) { 
4         System.out.println(id); 
5         System.out.println(str); 
6         return new ModelAndView("/helloWorld"); 
7     } 
用@ModelAttribute註解獲取POST請求的FORM表單數據 
JSP 
1 <form method="post" action="hao.do"> 
2 a: <input id="a" type="text"   name="a"/> 
3 b: <input id="b" type="text"   name="b"/> 
4 <input type="submit" value="Submit" /> 
5 </form> 

JAVA pojo 
1 public class Pojo{ 
2     private String a; 
3     private int b; 
4     
5 

JAVA controller 
1 @RequestMapping(method = RequestMethod.POST) 
2     public String processSubmit(@ModelAttribute("pojo") Pojo pojo) { 
3         
4         return "helloWorld"; 
5     } 
直接用HttpServletRequest獲取 
JAVA 
1     @RequestMapping(method = RequestMethod.GET) 
2     public String get(HttpServletRequest request, HttpServletResponse response) { 
4         System.out.println(request.getParameter("a")); 
5         return "helloWorld"; 
6     } 

用註解@RequestParam綁定請求參數a到變量a 
當請求參數a不存在時會有異常發生,可以通過設置屬性required=false解決, 
例如: @RequestParam(value="a", required=false) 
JAVA 
1     @RequestMapping(value = "/requestParam", method = RequestMethod.GET) 
2     public String setupForm(@RequestParam("a") String a, ModelMap model) { 
3         System.out.println(a); 
4         return "helloWorld";}