SpringMVC（三）@PathVariable

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>

@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>

使用@PathVariable可以让我们进行REST风格的编程

SpringMVC（三）@PathVariable

原文：http://www.cnblogs.com/FFFFF/p/4624140.html