Spring3 MVC請求參數獲取的幾種方法

1、      經過@PathVariabl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";
    }

 

例如，訪問user/123/lei路徑時，執行以上方法，其中，參數id=123，name=lei

 

2、      @ModelAttribute獲取POST請求的FORM表單數據

JSP表單以下

<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以下

    public class Pojo{
        private String a;
        private int b;
    }

 

Java Controller以下

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

3、      直接用HttpServletRequest獲取

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

 

4、      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,

例如: @RequestParam(value="a", required=false)

Controller以下

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