Spring mvc中@RequestMapping 6個基本用法小結

 小結下spring mvc中的@RequestMapping的用法。 

1）最基本的，方法級別上應用，例如： 
   

@RequestMapping(value="/departments")
public String simplePattern(){

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

}

   則訪問http://localhost/xxxx/departments的時候，會調用 simplePattern方法了 

2） 參數綁定 
  

@RequestMapping(value="/departments")
public String findDepatment(
  @RequestParam("departmentId") String departmentId){

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

}

   
  形如這樣的訪問形式： 

   /departments?departmentId=23就可以觸發訪問findDepatment方法了 

3 REST風格的參數 
  

@RequestMapping(value="/departments/{departmentId}")
public String findDepatment(@PathVariable String departmentId){

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

}

  
  形如REST風格的地址訪問，比如： 
/departments/23，其中用(@PathVariable接收rest風格的參數 

4 REST風格的參數綁定形式之2 
   先看例子，這個有點象之前的： 

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

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

}

   這個有點不同，就是接收形如/departments/23的URL訪問，把23作爲傳入的departmetnId,，但是在實際的方法findDepatmentAlternative中，使用 
@PathVariable("departmentId") String someDepartmentId，將其綁定爲 
someDepartmentId,所以這裏someDepartmentId爲23 

5 url中同時綁定多個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";

}

   這個其實也比較好理解了。 

6 支持正則表達式 
  

@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，則輸出： 
Textual part: sometext, numeric part: 123.