Spring MVC 中@RequestMapping 6个基本用法

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