SpringMVC（四）@RequestParam

使用@RequestParam可以将URL中的请求参数，绑定到方法的入参上，并通过@RequestParam的3个参数进行配置

其实不使用@RequestParam，SpringMVC也会将request的parameter自动绑定到method的parameter中，

使用@RequestParam只不过是对parametr进行配置，和对URL更精确化的配置

代码：

   1: @RequestMapping("/testRequestParam")

   2: @Controller

   3: public class TestRequestParam {

   4:     private static final String SUCCESS = "success";

   5:  

   6:     /*

   7:     * 使用@RequestParam绑定入参，并进行配置

   8:     *

   9:     * 当请求为：testRequestParam/user?name=zs&age=200时

  10:     * 输出结果：name = zs class = j1001 age = 200

  11:     *

  12:     * 当请求为：testRequestParam/user?name=zs&age=200&class=j111时

  13:     * 输出结果：name = zs class = j111 age = 200

  14:     * */

  15:     @RequestMapping("/user")

  16:     public String testParam(@RequestParam(value = "name") String name,

  17:                             @RequestParam(value = "class", required = false, defaultValue = "j1001") String cla,

  18:                             Integer age) {

  19:         System.out.println("name = " + name + " class = " + cla + " age = " + age);

  20:         return SUCCESS;

  21:     }

  22: }

URL：

   1: <a href="testRequestParam/user?name=zs&age=200&class=j111"> name=zs age=200 class="j1111" 输入name、age、class</a>

   2:  

   3: <br/><br/>

   4: <a href="testRequestParam/user?name=zs&age=200"> name=zs age=200 只输入name和age不输入class</a>

   5:  

   6: <br/><br/>