首先定义一个异常

public class MyException extends Exception {
    public MyException(String message) {
        super(message);
    }
}

当在control类中throw此异常

@Controller
public class HelloController {
    @RequestMapping("/json")
    public String json() throws MyException {
        throw new MyException("发生错误2");
    }
}

处理该异常

@ControllerAdvice
public class GlobalExceptionHandler {
    @ExceptionHandler(value = MyException.class) //这个注解，接受异常
    @ResponseBody //返回json
    public ErrorInfo<String> jsonErrorHandler(HttpServletRequest req, MyException e) throws Exception {
        ErrorInfo<String> r = new ErrorInfo<>();
        r.setMessage(e.getMessage());
        r.setCode(ErrorInfo.ERROR);
        r.setData("Some Data");
        r.setUrl(req.getRequestURL().toString());
        return r;
    }
}

应用启动：响应

{
    code: 100，
    data: "Some Data"，
    message: "发生错误2"，
    url: "http://localhost:8080/json"
}