Spring MVC 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

J***A

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

2 public ModelAndView helloWorld(@PathVariable String id,

3 @PathVariable String str) {

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 <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>

J***A pojo

1 public class Pojo{

2 private String a;

3 private int b;

4

5

J***A controller

1 @RequestMapping(method = RequestMethod.POST)

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

3

4 return "helloWorld";

5 }

直接用HttpServletRequest获取

J***A

1 @RequestMapping(method = RequestMethod.GET)

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

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)

J***A

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";}