springMvc原始碼學習之:spirngMvc獲取請求引數的方法

Love Lenka發表於2016-09-12

一、      通過@PathVariabl獲取路徑中的引數

複製程式碼
    @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";
    }
複製程式碼

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

 

二、      @ModelAttribute獲取POST請求的FORM表單資料

JSP表單如下

<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如下

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

 

Java Controller如下

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

三、      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"; 
}

 

四、      用註解@RequestParam繫結請求引數

用註解@RequestParam繫結請求引數a到變數a

當請求引數a不存在時會有異常發生,可以通過設定屬性required=false解決,

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

Controller如下

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

 

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