Spring mvc中@RequestMapping 6个基本用法小结

时间 2019-11-12

标签 spring mvc requestmapping 基本用法小结栏目 Spring 繁體版

原文原文链接

1）最基本的，方法级别上应用，例如：
正则表达式

Java代码 app

@RequestMapping(value="/departments") url
public String simplePattern(){ spa
System.out.println("simplePattern method was called"); rest
return "someResult"; it
} io

则访问http://localhost/xxxx/departments的时候，会调用 simplePattern方法了

2）参数绑定
方法

Java代码 im

@RequestMapping(value="/departments") call
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就能够触发访问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，好比：
/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，这个有点象以前的：

Java代码

@RequestMapping(value="/departments/{departmentId}")
public String findDepatmentAlternative(
@PathVariable("departmentId") String someDepartmentId){
System.out.println("Find department with ID: " + someDepartmentId);
return "someResult";
}

这个有点不一样，就是接收形如/departments/23的URL访问，把23做为传入的departmetnId,，可是在实际的方法findDepatmentAlternative中，使用
@PathVariable("departmentId") String someDepartmentId，将其绑定为
someDepartmentId,因此这里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";
}

好比以下的URL：/sometext.123，则输出：
Textual part: sometext, numeric part: 123.