spring mvc的参数获取(转)

原文地址：http://www.blogjava.net/wmcoo/articles/333463.html

1.通过@PathVariabl注解获取路径中传递参数

@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");
}

2.用@ModelAttribute注解获取POST请求的FORM表单数据

<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>

public class Pojo{
    private String a;
    private int b;
    //...
}

@RequestMapping(method = RequestMethod.POST)
public String processSubmit(@ModelAttribute("pojo") Pojo pojo) {         
    return "helloWorld";
}

3.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";
}

4.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)

@RequestMapping(value = "/requestParam", method = RequestMethod.GET)
public String setupForm(@RequestParam("a") String a, ModelMap model) {
    System.out.println(a);
    return "helloWorld";
}