Spring MVC 中@RequestMapping 6个基本用法

怼烎@ 2022-06-13 13:53 147阅读 0赞

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][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";
    
    }

4 . 列表内容  
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

[http_localhost_xxxx_departments]: http://localhost/xxxx/departments