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

1@RequestMapping(value= " /{id}/{str} " )

2 public ModelAndView helloWorld(@PathVariable String id, @PathVariable String str) {

3 System.out.println(id);

4 System.out.println(str);

5 return new ModelAndView( " /helloWorld " );

6}

 

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

 

 

1<form method="post" action="hao.do">

2 a: <input id="a" type="text" name="a"/>

3 b: <input id="b" type="text" name="b"/>

4 <input type="submit" value="Submit" />

5 </form>

 

JAVA pojo

 

 

1public class Pojo{

2 private String a;

3 private int b;

4}

 

JAVA controller

 

 

1@RequestMapping(method= RequestMethod.POST)

2 public String processSubmit(@ModelAttribute( " pojo " ) Pojo pojo) {

3 return " helloWorld " ;

4 }

 

直接用HttpServletRequest获取
JAVA

 

 

1@RequestMapping(method= RequestMethod.GET)

2 public String get(HttpServletRequest request, HttpServletResponse response) {

3 System.out.println(request.getParameter( " a " ));

4 return " helloWorld " ;

5}

 

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 String setupForm(@RequestParam( " a " ) String a, ModelMap model) {

3 System.out.println(a);

4 return " helloWorld " ;}