最近从Struts转投SpringMVC，看代码时发现这个注解，感觉其作用应该和Struts的action差不多，把用法记录下来。
1.
代码语言：javascript复制@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implePattern方法了 2.
代码语言：javascript复制@RequestMapping(value="/departments")
public String findDepatment(
@RequestParam("departmentId") String departmentId){
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.
代码语言：javascript复制@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.
代码语言：javascript复制@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5.
代码语言：javascript复制@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";
}
//绑定多个参数6.
代码语言：javascript复制@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";
}
//正则表达式 比如如下的URL：/sometext.123，则输出： Textual part: sometext, numeric part: 123. 
