Spring MVC 中@RequestMapping 6个基本用法小结

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";
}

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