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：



Java代码

@RequestMapping(value="/departments")

public String simplePattern(){



System.out.println("simplePattern method was called");

return "someResult";



}



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

@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



Java代码

@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：

Java代码

@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



Java代码

@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



Java代码

@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.