springmvc请求接收参数的几种方法

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 " ;}