Spring MVC 的请求参数获取-优快云博客

本文介绍如何使用Spring MVC框架处理HTTP请求中的参数。包括利用@PathVariable注解获取URL路径中的参数，使用@ModelAttribute和@RequestParam注解处理POST请求中的表单数据及GET请求中的查询参数，并展示了直接使用HttpServletRequest获取请求参数的方法。

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通过@PathVariabl注解获取路径中传递参数
JAVA
1 @RequestMapping(value = " /{id}/{str} " )
2 public ModelAndViewhelloWorld(@PathVariableStringid,
3 @PathVariableStringstr){
4 System.out.println(id);
5 System.out.println(str);
6 return new ModelAndView( " /helloWorld " );
7 }
用@ModelAttribute注解获取POST请求的FORM表单数据
JSP
1 < formmethod = " post " action = " hao.do " >
2 a: < inputid = " a " type = " text " name = " a " />
3 b: < inputid = " b " type = " text " name = " b " />
4 < inputtype = " submit " value = " Submit " />
5 </ form >

JAVA pojo
1 public class Pojo{
2 private Stringa;
3 private int b;
4
5

JAVA controller
1 @RequestMapping(method = RequestMethod.POST)
2 public StringprocessSubmit(@ModelAttribute( " pojo " )Pojopojo){
3
4 return " helloWorld " ;
5 }
直接用HttpServletRequest获取
JAVA
1 @RequestMapping(method = RequestMethod.GET)
2 public Stringget(HttpServletRequestrequest,HttpServletResponseresponse){
4 System.out.println(request.getParameter( " a " ));
5 return " helloWorld " ;
6 }
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
1 @RequestMapping(value = " /requestParam " ,method = RequestMethod.GET)
2 public StringsetupForm(@RequestParam( " a " )Stringa,ModelMapmodel){
3 System.out.println(a);
4 return "helloWorld";}