Spring mvc中@RequestMapping 6个基本用法小结

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： 
   

@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 
  

@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 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： 
/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： 

@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";

}

   这个其实也比较好理解了。 

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.