requestmapping总结

小结下spring mvc中的@RequestMapping的用法。

1）最基本的，方法级别上应用，例如：

Java代码

@RequestMapping(value="/departments")

1.
  public String simplePattern(){
2.
3.

System.out.println(“simplePattern method was called”);

4.

return “someResult”;

5.
6.
  }
7.

则访问http://localhost/xxxx/departments的时候，会调用 simplePattern方法了

2） 参数绑定

Java代码

@RequestMapping(value="/departments")

1.
  public String findDepatment(
2.

@RequestParam(“departmentId”) String departmentId){

3.
4.

System.out.println(“Find department with ID: " + departmentId);

5.

return “someResult”;

6.
7.
  }
8.

形如这样的访问形式：

/departments?departmentId=23就可以触发访问findDepatment方法了

3 REST风格的参数

Java代码

@RequestMapping(value="/departments/{departmentId}”)

1.
  public String findDepatment(@PathVariable String departmentId){
2.
3.

System.out.println(“Find department with ID: " + departmentId);

4.

return “someResult”;

5.
6.
  }
7.

形如REST风格的地址访问，比如：

/departments/23，其中用(@PathVariable接收rest风格的参数

4 REST风格的参数绑定形式之2

先看例子，这个有点象之前的：

Java代码

@RequestMapping(value="/departments/{departmentId}”)

1.
  public String findDepatmentAlternative(
2.

@PathVariable(“departmentId”) String someDepartmentId){

3.
4.

System.out.println(“Find department with ID: " + someDepartmentId);

5.

return “someResult”;

6.
7.
  }
8.

这个有点不同，就是接收形如/departments/23的URL访问，把23作为传入的departmetnId,，但是在实际的方法findDepatmentAlternative

中，使用

@PathVariable(“departmentId”) String someDepartmentId，将其绑定为

someDepartmentId,所以这里someDepartmentId为23

5 url中同时绑定多个id

Java代码

@RequestMapping(value="/departments/{departmentId}/employees/{employeeId}”)

1.
  public String findEmployee(
2.

@PathVariable String departmentId,

3.

@PathVariable String employeeId){

4.
5.

System.out.println(“Find employee with ID: " + employeeId +

6.

" from department: " + departmentId);

7.

return “someResult”;

8.
9.

10.}

这个其实也比较好理解了。

6 支持正则表达式

Java代码

1.@RequestMapping(value="/{textualPart:[a-z-]+}.{numericPart:[\\d]+}")
2.public String regularExpression(
3.  @PathVariable String textualPart,
4.  @PathVariable String numericPart){
5.
6.    System.out.println("Textual part: " + textualPart +
7.      ", numeric part: " + numericPart);
8.    return "someResult";
9.}

比如如下的URL：/sometext.123，则输出：

Textual part: sometext, numeric part: 123.