一、思想

第一步、定义一个返回类型枚举rescode，返回类res（rescode）

第二步、自定义运行时异常类bussEx ，定义全局异常处理类GolbEx

第三步、判断返回前端是否出现异常

               3.1出现异常：手动抛出bussEx（rescode），并传入错误类型，会触发GolbEx类中关联bussEx的方法handler（ex），在

                    handler（）中取出code和info，封装到res返回类，返回给前端

               3.2未出现异常：直接control层返回封装好数据的res对象

其实说白了，最终都是返回res对象，只是一个是在control层直接返回，一个是在全局异常处理类中捕获异常，然后返回；而rescode枚举类也只是为了封装状态类型，即使没有这个枚举，也可以实现标题功能

二、代码

//返回类模板public class ResTypeBean<T> {private int code;private String info;private T data;public ResTypeBean(){};public ResTypeBean(int code,String info){this.code = code;this.info = info;}public ResTypeBean(int code,String info,T data){this.code = code;this.info = info;this.data = data;};public int getCode() {return code;}public void setCode(int code) {this.code = code;}public String getInfo() {return info;}public void setInfo(String info) {this.info = info;}public T getData() {return data;}public void setData(T data) {this.data = data;}
}

//返回类型枚举，可扩展public enum  ResCode {SUCCESS(0,"成功"),UNKNOWN(-1,"未知错误");private int code;private String info;ResCode(int code,String info){this.code = code;this.info = info;}public int getCode() {return code;}public String getInfo() {return info;}
}

//自定义运行时异常
public class BusinessException extends RuntimeException{private int errCode = ResCode.UNKNOWN.getCode();public BusinessException(){};public BusinessException(ResCode resCode){super(resCode.getInfo());this.errCode = resCode.getCode();}public int getErrCode() {return errCode;}public void setErrCode(int errCode) {this.errCode = errCode;}
}

//全局异常处理类
@RestControllerAdvice
public class GlobalExceptionHandler {@ExceptionHandler(value = BusinessException.class)public ResTypeBean businessExceptionHandler(BusinessException e) throws  Exception{ResTypeBean<Object> res = new ResTypeBean<>(e.getErrCode(), e.getMessage());return res;}
}

测试代码

    @RequestMapping(value = "/getDicList" ,method = RequestMethod.POST)public ResTypeBean getDicList(){if(错误){new BusinessException(ResCode.UNKNOWN);}else{DicListBean dicList = dataService.getDicList();return new ResTypeBean(ResCode.SUCCESS.getCode(),ResCode.SUCCESS.getInfo(),dicList); }
//        DicListBean dicList = dataService.getDicList();
//        return new ResTypeBean(ResCode.SUCCESS.getCode(),ResCode.SUCCESS.getInfo(),dicList);}