springmvc請求參數獲取的四種方法

一種經過@PathVariable獲取路徑中的參數

@RequestMapping(value="user/{id}/{name}",method=RequestMethod.GET)  
public String printMessage1(@PathVariable String id,@PathVariable String name, ModelMap model) {    
                System.out.println(id);    
                System.out.println(name);    
                model.addAttribute("message", "111111");    
                 return "users";   }

一種是@ModelAttribute獲取Post請求的from表單數據

<form method="post" action="hao.do">

a: <input id="a" type="text" name="a"/>

b: <input id="b" type="text" name="b"/>

<input type="submit" value="Submit" /> </form>

java pojo,public class Pojo{ private String a; private int b; }

@RequestMapping(method = RequestMethod.POST) public String processSubmit(@ModelAttribute("pojo") Pojo pojo) { return "helloWorld"; }

一種是用HttpServletRequest獲取

@RequestMapping(method = RequestMethod.GET) public String get(HttpServletRequest request, HttpServletResponse response) { System.out.println(request.getParameter("a")); return "helloWorld"; }

一種是用註解@RequestParam綁定請求參數

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,能夠經過設置屬性required=false解決,

@RequestMapping(value = "/requestParam", method = RequestMethod.GET) public String setupForm(@RequestParam("a") String a, ModelMap model) { System.out.println(a); return "helloWorld"; }