SpringMVC的@RequestMapping的用法

1．最基本的，方法级别上应用：

@RequestMapping(value="/departments")
public String simplePattern(){
System.out.println("simplePattern method was called");
return "someResult";
}

访问http://localhost/xxxx/departments的时候，会调用 SimplePattern方法。

2．参数绑定 ：

@RequestMapping(value="/departments")
public String findDepatment(@RequestParam("departmentId") String departmentId){
System.out.println("Find department with ID: " + departmentId);
return "someResult";
}

访问形式： http://localhost/xxxx/departments?departmentId=23就可以触发访问findDepatment方法。
3．REST风格的参数：

@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： http://localhost/xxxx/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：

@RequestMapping(value="/departments/{departmentId}")
public String findDepatmentAlternative(@PathVariable("departmentId") String someDepartmentId){
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：

@RequestMapping(value="/departments/{departmentId}/employees/{employeeId}")
public String findEmployee(@PathVariable String departmentId, @PathVariable String employeeId){
System.out.println("Find employee with ID: " + employeeId +
" from department: " + departmentId);
return "someResult";
}

6． 支持正则表达式：

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