Spring3 MVC请求参数获取的几种方法
一、通过@PathVariabl获取路径中的参数
@RequestMapping(value="user/{id}/{name}",method=RequestMethod.GET)
public String printMessage1(@PathVariable String id,@PathVariable String name, ModelMap model) {
System.out.println(id);
System.out.println(name);
model.addAttribute("message", "111111");
return "users";
}
例如，访问user/123/lei路径时，执行以上方法，其中，参数id=123，name=lei
二、@ModelAttribute获取POST请求的FORM表单数据
JSP表单如下
<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如下
public class Pojo{
private String a;
private int b;
}
Java Controller如下
@RequestMapping(method = RequestMethod.POST)
public String processSubmit(@ModelAttribute("pojo") Pojo pojo) {
return "helloWorld";
}
三、直接用HttpServletRequest获取
@RequestMapping(method = RequestMethod.GET)
public String get(HttpServletRequest request, HttpServletResponse response) {
System.out.println(request.getParameter("a"));
return "helloWorld";
}
四、用注解@RequestParam绑定请求参数
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)
Controller如下
@RequestMapping(value = "/requestParam", method = RequestMethod.GET)
public String setupForm(@RequestParam("a") String a, ModelMap model) {
System.out.println(a);
return "helloWorld";
}
