Spring mvc中@RequestMapping 6個基本用法小結

1）最基本的，方法級別上應用，例如：

Java代碼  
1.  
2.@RequestMapping(value="/departments")  
3.public String simplePattern(){  
4.  
5.  System.out.println("simplePattern method was called");  
6.  return "someResult";  
7.  
8.}  

@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

Java代碼  
1.@RequestMapping(value="/departments")  
2.public String findDepatment(  
3.  @RequestParam("departmentId") String departmentId){  
4.    
5.    System.out.println("Find department with ID: " + departmentId);  
6.    return "someResult";  
7.  
8.}  
@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

Java代碼  
1.  
2.@RequestMapping(value="/departments/{departmentId}")  
3.public String findDepatment(@PathVariable String departmentId){  
4.  
5.  System.out.println("Find department with ID: " + departmentId);  
6.  return "someResult";  
7.  
8.}  

@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：

Java代碼  
1.@RequestMapping(value="/departments/{departmentId}")  
2.public String findDepatmentAlternative(  
3.  @PathVariable("departmentId") String someDepartmentId){  
4.  
5.    System.out.println("Find department with ID: " + someDepartmentId);  
6.    return "someResult";  
7.  
8.}  
@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

Java代碼  
1.@RequestMapping(value="/departments/{departmentId}/employees/{employeeId}")  
2.public String findEmployee(  
3.  @PathVariable String departmentId,  
4.  @PathVariable String employeeId){  
5.  
6.    System.out.println("Find employee with ID: " + employeeId +    
7.      " from department: " + departmentId);  
8.    return "someResult";  
9.  
10.}  
@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

Java代碼  
1.@RequestMapping(value="/{textualPart:[a-z-]+}.{numericPart:[\\d]+}")  
2.public String regularExpression(  
3.  @PathVariable String textualPart,  
4.  @PathVariable String numericPart){  
5.  
6.    System.out.println("Textual part: " + textualPart +    
7.      ", numeric part: " + numericPart);  
8.    return "someResult";  
9.}  
@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.