SpringMVC中@RequestMapping 6个基本用法小结

桃扇骨 2022-06-09 05:35 168阅读 0赞

1）最基本的，方法级别上应用，例如：

Java代码 ![收藏代码][icon_star.png]

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

则访问http://localhost/xxxx/departments的时候，会调用 simplePattern方法了   
  
2） 参数绑定

Java代码 ![收藏代码][icon_star.png]

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.  \}

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

Java代码 ![收藏代码][icon_star.png]

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

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：

Java代码 ![收藏代码][icon_star.png]

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 ![收藏代码][icon_star.png]

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 ![收藏代码][icon_star.png]

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.  \}

比如如下的URL：/sometext.123，则输出：   
Textual part: sometext, numeric part: 123.

[icon_star.png]: /images/20220609/9b6867d35d3e40e68188b5f6aa15be17.png