Spring mvc中@RequestMapping 6个基本用法小结

2022-01-17 21:47:22

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.

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Spring mvc中@RequestMapping 6个基本用法小结

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