转自：http://www.cnblogs.com/FFFFF/p/4624140.html
使用@PathVariable可以快速的访问，URL中的部分内容。
①. 在@RequestMapping的value中使用URI template（{变量名}），然后在@RequestMapping注解方法的需要绑定的参数前，使用@PathVariable指定变量名（如果变量名和参数名一致也可以不指定），从而将URL中的值绑定到参数上。
代码：
1: @RequestMapping("/testPathVariable")
2: @Controller
3: public class TestPathVariable {
4:
5: /*
6: * URI模板指定了一个变量名为id的变量，当控制器处理请求时会将 id 替换为正确的值
7: *
8: * 若请求为 testPathVariable/user/29，则uid=29，输出29
9: *
10: * */
11: @RequestMapping("/user/{id}")
12: public String testPathVariable(@PathVariable("id") Integer uid) {
13: System.out.println(uid);
14: return "success";
15: }
16:
17: }
URL:
1: <a href="testPathVariable/user/29">testPathVariable user 29</a>
②. 一个方法可以有多个@PathVriable注解
URI template 可以这样，全部在方法上
代码：
1: @RequestMapping("/testPathVariable")
2: @Controller
3: public class TestPathVariable {
4:
5: @RequestMapping("/user/{uid}/book/{bid}")
6: public String testMultiplePathVariable(@PathVariable("uid") Integer uid,@PathVariable("bid") Integer bid) {
7: System.out.println(uid);
8: System.out.println(bid);
9: return "success";
10: }
11:
12: }
URL:
1: <a href="testPathVariable/user/29/book/101">testPathVariable user 29 book 101</a>
URI template还可以这样， 加在类和方法上
代码：
1: @RequestMapping("/testPathVariable/user/{uid}")
2: @Controller
3: public class TestPathVariable {
4:
5: @RequestMapping("/book/{bid}")
6: public String testMultiplePathVariable(@PathVariable("uid") Integer uid, @PathVariable("bid") Integer bid) {
7:
8: System.out.println(uid);
9: System.out.println(bid);
10: return "success";
11: }
12:
13: }
URL:
1: <a href="testPathVariable/user/29/book/101">testPathVariable user 29 book 101</a>
③. @PathVariable 还可以使用在 map 参数上，但是必须配置<mvc:annotation-driven />
代码：
1: @RequestMapping("/testPathVariable/user/{uid}")
2: @Controller
3: public class TestPathVariable {
4:
5: @RequestMapping("/book/{bid}")
6: public String testMultiplePathVariable_Map(@PathVariable Map<String, String> map) {
7: System.out.println(map.get("uid"));
8: System.out.println(map.get("bid"));
9: return "success";
10: }
11:
12: }
URL：
1: <a href="testPathVariable/user/29/book/101">testPathVariable user 29 book 101</a>
applicationContext.xml
1: <mvc:annotation-driven></mvc:annotation-driven>
④. URI template 还支持正则表达式 。具体请看API
⑤. 使用@PathVariable可以让我们进行REST风格的编程，简单理解REST：对网络中某一资源的操作使用一个URI进行表示，然后使用状态来（GET、POST、PUT、DELETE）表示某种操作
原来对user进行CURD 使用了@PathVariable之后的CRUD
/user/get?id=10
/user/post?…
/user/update?id=10…
/user/delete?id=10
/user/id=10 RequestMethod.GET
/user/… RequestMethod.POST
/user/id=10… RequestMethod.PUT
/user/id=10 RequestMethod.DELETE
为了使普通表单支持PUT、DELETE请求，可以在POST请求下添加一个隐藏域（），然后在web.xml中配置HiddenHttpMethodFilter
对某用户的订单进行CRUD，代码：
1: @RequestMapping("/testPathVariable/user/{uid}")
2: @Controller
3: public class TestPathVariable {
4:
5: /*
6: *获取某用户的所有订单
7: * */
8: @RequestMapping(value = "/order", method = RequestMethod.GET)
9: public String testGET(@PathVariable Integer uid) {
10: System.out.println("GET: " + " user-" + uid);
11: return "success";
12: }
13:
14: /*
15: * 获取某用户的某个订单详情
16: * */
17: @RequestMapping(value = "/order/{oid}", method = RequestMethod.GET)
18: public String testGET_OID(@PathVariable Integer uid, @PathVariable Integer oid) {
19: System.out.println("GET_OID: " + " user-" + uid + " order-" + oid);
20: return "success";
21: }
22:
23: /*
24: * 修改某用户的某个订单的总价
25: * params = {"total"}
26: * 若加params，则请求中必须有该变量,没有会报错。
27: * 如果不加params，则请求中不强制要求包含该变量
28: * 不包含时，则parameter中的对应变量值为为Null，
29: * 如请求/testPathVariable/user/29/order/101
30: * 则total=null
31: * 包含，则parameter中的对应变量值为请求中的值
32: * 如请求/testPathVariable/user/29/order/101?total=1000
33: * 则total=1000
34: * */
35: @RequestMapping(value = "/order/{oid}", method = RequestMethod.PUT, params = {"total"})
36: public String testPUT(@PathVariable Integer uid, @PathVariable Integer oid, Integer total) {
37: System.out.println("PUT: " + " user-" + uid + " order-" + oid);
38: System.out.println(total);
39: return "success";
40: }
41:
42: /*
43: * 新增某用户的订单,变量略
44: * */
45: @RequestMapping(value = "/order", method = RequestMethod.POST)
46: public String testPOST_(@PathVariable Integer uid) {
47: System.out.println("POST: " + " user-" + uid + " order：订单信息");
48: return "success";
49: }
50:
51: /*
52: * 删除某用户的某个订单
53: * */
54: @RequestMapping(value = "/order/{oid}", method = RequestMethod.DELETE)
55: public String testDELETE(@PathVariable Integer uid, @PathVariable Integer oid) {
56: System.out.println("GET: " + " user-" + uid + " order-" + oid);
57: return "success";
58: }
59: }
index.jsp:
1:
2: <form action="testPathVariable/user/29/order/101" method="post">
3: <input type="hidden" name="_method" value="DELETE"/><br/>
4: <input type="submit" value="删除ID为29用户的ID为101的订单"/>
5: </form>
6:
7: <br/><br/>
8: <form action="testPathVariable/user/29/order" method="post">
9: 输入订单信息....<br/>
10: <input type="submit" value="ID为29用户新增订单"/>
11: </form>
12:
13: <br/><br/>
14:
15: <form action="testPathVariable/user/29/order/101" method="post">
16: <input type="hidden" name="_method" value="put"/><br/>
17: <input type="text" name="total"/><br/>
18: <input type="submit" value="修改ID为29用户，ID为101订单的总价"/>
19: </form>
20:
21: <br/><br/>
22:
23:
24: <a href="testPathVariable/user/29/order">获取ID为29用户的所有订单</a>
25:
26: <br/><br/>
27:
28: <a href="testPathVariable/user/29/order/101">获取ID为29的用户，ID为101的订单的详情</a>
29:
30: <br/><br/>
31:
在web.xml中配置HiddenHttpMethodFilter：
1: <filter>
2: <filter-name>hiddenHttpMethodFilter</filter-name>
3: <filter-class>org.springframework.web.filter.HiddenHttpMethodFilter</filter-class>
4: </filter>
5: <filter-mapping>
6: <filter-name>hiddenHttpMethodFilter</filter-name>
7: <url-pattern>/*</url-pattern>
8: </filter-mapping>
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