spring mvc中的@RequestMapping value用法小结

﹏ヽ暗。殇╰゛Y 2021-09-15 14:22 352阅读 0赞

Spring mvc中@RequestMapping 6个基本用法小结  
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";  
    
    }

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：

@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";  
    }

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