针对controller 中 如何使用注解进行解析
@RestController
- 返回数据类型为 Json 字符串，特别适合我们给其他系统提供接口时使用。
@RequestMapping
(1) 不同前缀访问同一个方法,此时访问hello和hi 都可以访问到say（）这个方法
@RequestMapping(value = {"/hello","/hi"},method = RequestMethod.GET)
public String say(){
return girlProperties.getName();
}（2）给类一个RequestMapping, 访问时就是：http://localhost:8099/hello/say
@RestController
@RequestMapping("/hello")
public class HelloController {
@Resource
private GirlProperties girlProperties;
@RequestMapping(value = "/say",method = RequestMethod.GET)
public String say(){
return girlProperties.getName();
}
}@PathVariable：获取url中的数据
@RestController
@RequestMapping("/hello")
public class HelloController {
@Resource
private GirlProperties girlProperties;
@RequestMapping(value = "/say/{id}",method = RequestMethod.GET)
public String say(@PathVariable("id") Integer id){
return "id :"+id;
}
}访问http://localhost:8099/hello/say/100, 结果如下
id :100@RequestParam :获取请求参数的值
(1) 正常请求
@RestController
@RequestMapping("/hello")
public class HelloController {
@Resource
private GirlProperties girlProperties;
@RequestMapping(value = "/say",method = RequestMethod.GET)
public String say(@RequestParam("id") Integer id){
return "id :"+id;
}
}访问 http://localhost:8099/hello/say?id=111 结果如下
id :111（2）设置参数非必须的，并且设置上默认值
@RestController
@RequestMapping("/hello")
public class HelloController {
@Resource
private GirlProperties girlProperties;
@RequestMapping(value = "/say",method = RequestMethod.GET)
public String say(@RequestParam(value = "id",required = false,defaultValue = "0") Integer id){
return "id :"+id;
}
}
访问http://localhost:8099/hello/say 结果如下
id :0@GetMapping ，当然也有对应的Post等请求的简化写法
- 这里对应的就是下面这句代码
@GetMapping("/say")
//等同于下面代码
@RequestMapping(value = "/say",method = RequestMethod.GET)
