Spring mvc中@RequestMapping 6个基本用法整理

继续整理，这个是前段时间用jsp开发的一个站点，说起来php程序员去做jsp程序确实有些小不适应，但是弄完后绝对对于这种强类型语言而比收获还是颇多的。

1,最基本的，方法级别上应用
@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.