SpringMVC通过注解获得参数

SpringMVC可以通过RequestParam注解来映射获得参数，具体用法如下：

例子：

配置过程省略

1.新建controller类

 1 package com.loger.controller;
 2
 3 import org.springframework.stereotype.Controller;
 4 import org.springframework.web.bind.annotation.RequestMapping;
 5
 6
 7 @Controller
 8 public class RequestParam {
 9
10     public static final String SUCCESS = "success";
11
12     @RequestMapping(value="/requestparam")
13     public String requestParam(@org.springframework.web.bind.annotation.
14             RequestParam(value="username") String un,
15             @org.springframework.web.bind.annotation.RequestParam(value="age") Integer age){
16
17         System.out.println(un + " " + age);
18
19         return SUCCESS;
20     }
21 }

2.index.jsp

运行结果：

补充：如何表单名跟方法的参数名一致的话，无需再用@RequestParam注解来映射。

　　如改为

　　　@RequestMapping(value="/requestparam")
     public String requestParam(String username,Integer age)即可！

用类作为参数，且包含级联属性的参数获取方法：　　1.新建Adress类　　

 1 package com.loger.bean;
 2
 3 public class Address {
 4     private String province;
 5     private String city;
 6     public String getProvince() {
 7         return province;
 8     }
 9     public void setProvince(String province) {
10         this.province = province;
11     }
12     public String getCity() {
13         return city;
14     }
15     public void setCity(String city) {
16         this.city = city;
17     }
18     @Override
19     public String toString() {
20         return "Address [province=" + province + ", city=" + city + "]";
21     }
22
23 }

2.新建User类

 1 package com.loger.bean;
 2
 3 public class Address {
 4     private String province;
 5     private String city;
 6     public String getProvince() {
 7         return province;
 8     }
 9     public void setProvince(String province) {
10         this.province = province;
11     }
12     public String getCity() {
13         return city;
14     }
15     public void setCity(String city) {
16         this.city = city;
17     }
18     @Override
19     public String toString() {
20         return "Address [province=" + province + ", city=" + city + "]";
21     }
22
23 }

3.controller

4.表单

　　User有级联属性Address，表单传入的参数是address.city address.province

1 <form action="pojoparam">
2         姓名：<input type="text" name="name"><br>
3         年龄：<input type="text" name="age"><br>
4         城市：<input type="text" name="address.city"><br>
5         省份：<input type="text" name="address.province"><br>
6         <input type="submit" value="提交"><br>
7     </form>

运行结果：