浅谈java控制器拦截之ControllerAdvice

一、Controller跨域jsonp格式返回

/**
 * JSONP支持
 */
@ControllerAdvice(basePackages = "com.kugou.fanxing.romantic.controller")
public class JsonpAdvice extends AbstractJsonpResponseBodyAdvice{  
  
    public JsonpAdvice() {  
        super("jsonCallBack","jsonpcallback");
    }  
}

二、Controller全局异常统一拦截

/**
* 统一异常拦截
*/

@ControllerAdvice(assignableTypes = {AController.class})
public class MobileExceptionHandler {

    @ExceptionHandler(value = BizException.class)
    @ResponseBody
    public Result jsonErrorHandler(HttpServletRequest req, BizException e) {
        return Response.failed(e);
    }

    @ExceptionHandler(value = {Exception.class})
    @ResponseBody
    public Result jsonErrorHandler(HttpServletRequest req, Exception e) {
        return Response.failed(ErrCode.UNKNOWN_ERROR);
    }

}

三、Controller全局共享数据

@ControllerAdvice
public class GlobalShareDataHandler{

    /**
     * 全局数据绑定，所有controller都可以通过Model对象拿到这个map
     * Map<String,Object> map = model.asMap();
     * System.out.println(map);
     * @return
     */
    @ModelAttribute(name = "md")
    public Map<String,Object> mydata() {
        HashMap<String, Object> map = new HashMap<>();
        map.put("age", 99);
        map.put("gender", "男");
        return map;
    }

}

四、Controller全局输入参数预处理（加一个前缀，避免参数重名）

/**
* 输入参数b的每一个字段名前加上前缀b.
*/
@ControllerAdvice
public class GlobalBinderHandler{
    
    @InitBinder("b")
    public void b(WebDataBinder binder) {
        binder.setFieldDefaultPrefix("b.");
    }
}


@RestController
public class Hello {

    @PostMapping("/book")
    public void addBook(@ModelAttribute("b") Book book, @ModelAttribute("a") Author author) {
        System.out.println(book);
        System.out.println(author);
    }
}