Springboot处理异常的常见方式

//指定出现什么异常执行这个方法
    @ExceptionHandler(Exception.class)
    @ResponseBody //为了返回数据
    public R error(Exception e) {
        e.printStackTrace();
        return R.error().message("执行了全局异常处理..");
    }

//特定异常处理
    @ExceptionHandler(ArithmeticException.class)
    @ResponseBody//为了返回数据
    public R error(ArithmeticException e){
        e.printStackTrace();
        return R.error().message("执行了ArithmeticException异常处理");
    }

@Data
@AllArgsConstructor//生成有参构造方法
@NoArgsConstructor//生成无参构造方法
public class MyException extends RuntimeException{
    private Integer code;
    private String msg;
}

//自定义异常处理
    @ExceptionHandler(MyException.class)
    @ResponseBody//返回数据
    public R error(MyException e){
        e.printStackTrace();
        return R.error().code(e.getCode()).message(e.getMsg());//封装自定义异常信息
    }

try{
           int i=10/0;
       }catch (Exception e){
           throw new MyException(20001,"执行自定义异常处理");
       }

@Data
public class R {
    @ApiModelProperty(value = "是否成功")
    private Boolean success;
    @ApiModelProperty(value = "返回码")
    private Integer code;
    @ApiModelProperty(value = "返回消息")
    private String message;
    @ApiModelProperty(value = "返回数据")
    private Map<String, Object> data = new HashMap<String, Object>();
    private R(){}
    public static R ok(){
        R r = new R();
        r.setSuccess(true);
        r.setCode(ResultCode.SUCCESS);
        r.setMessage("成功");
        return r;
    }
    public static R error(){
        R r = new R();
        r.setSuccess(false);
        r.setCode(ResultCode.ERROR);
        r.setMessage("失败");
        return r;
    }
    public R success(Boolean success){
        this.setSuccess(success);
        return this;
    }
    public R message(String message){
        this.setMessage(message);
        return this;
    }
    public R code(Integer code){
        this.setCode(code);
        return this;
    }
    public R data(String key, Object value){
        this.data.put(key, value);
        return this;
    }
    public R data(Map<String, Object> map){
        this.setData(map);
        return this;
    }
}

public interface ResultCode {
    public static Integer SUCCESS = 20000;
    public static Integer ERROR = 20001;
}