SpringMVC 的请求参数获取的几种方法

 

通过@PathVariabl注解获取路径中传递参数

JAVA

 @RequestMapping(value  =   " /{id}/{str} " )
  public  ModelAndView helloWorld(@PathVariable String id, @PathVariable String str) {
 System.out.println(id);
 System.out.println(str);
  return   new  ModelAndView( " /helloWorld " );
}

用@ModelAttribute注解获取POST请求的FORM表单数据
JSP

< 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;
}

JAVA controller

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

直接用HttpServletRequest获取
JAVA

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

用注解@RequestParam绑定请求参数a到变量a
当请求参数a不存在时会有异常发生,可以通过设置属性required=false解决,
例如: @RequestParam(value="a", required=false)
JAVA

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