spring Requestmapping标签介绍

1）最基本的，方法级别上应用，例如：

Java代码

@RequestMapping(value="/departments")

public String simplePattern(){

System.out.println("simplePattern method was called");

return "someResult";

}

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")

public String findDepatment(

@RequestParam("departmentId") String departmentId){

12

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

}

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}")

public String findDepatment(@PathVariable String departmentId){

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

return "someResult";

}

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}")

public String findDepatmentAlternative(

@PathVariable("departmentId") String someDepartmentId){

12

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

}

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}")

public String findEmployee(

@PathVariable String departmentId,

@PathVariable String employeeId){

123

System.out.println("Find employee with ID: " + employeeId +     " from department: " + departmentId);  return "someResult";  

}

这个其实也比较好理解了。

6 支持正则表达式

Java代码

@RequestMapping(value="/{textualPart:[a-z-]+}.{numericPart:[\d]+}")

public String regularExpression(

@PathVariable String textualPart,

@PathVariable String numericPart){

123

System.out.println("Textual part: " + textualPart +     ", numeric part: " + numericPart);  return "someResult";  

}

比如如下的URL：/sometext.123，则输出：
Textual part: sometext, numeric part: 123.