Six usage summary of @questMappering

Summarize the usage of @RequestMapping in spring mvc. 

1) The most basic, applied at the method level, for example: 
   

Java code  

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

   When visiting http://localhost/xxxx/departments, the simplePattern method will be called 

2) Parameter binding 
  

Java code  

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. }  

   
  An access form like this: 

   /departments?departmentId=23 can trigger access to the findDepatment method. 

3 REST style parameters 
  

Java code  

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

  
  REST-style address access, such as: 
/departments/23, where (@PathVariable is used to receive rest-style parameters 

4 REST-style parameter binding form 2) Let's 
   look at the example first, which is a bit like the previous one: 

Java code  

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. }  

   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 
 

Java代码  

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. }  

   这个其实也比较好理解了。 

6 支持正则表达式 
  

Java代码  

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. }  

   For example, the following URL: /sometext.123 will output: 
Textual part: sometext, numeric part: 123.