springboot 全局异常做法

springboot 配置全局异常，其实非常简单，只需要一个简单的配置类

package com.sinosig.ewp.wx.service.config;

import com.sinosig.ewp.common.base.ResultDTO;
import lombok.extern.slf4j.Slf4j;
import org.springframework.web.bind.annotation.ExceptionHandler;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.bind.annotation.RestControllerAdvice;

/**
 * @author Mongo
 * @return
 */
@RestControllerAdvice
@Slf4j
public class GraceExceptionHandler {
    
    /**
     * 全局异常捕获
     * @param e
     * @return
     */
    @ExceptionHandler(Exception.class)
    @ResponseBody
    public Object returnException(Exception e) {
        log.error("error",e);
        return ResultsBean.build(500,"全局异常啦啦啦");
    }

}

重点是：这个配置类上的注解：@RestControllerAdvice ，方法上的注解 @ExceptionHandler(Exception.class)

之后程序里面，一旦发生了任何异常，都会走这里的异常方法，即可达到全局异常捕获！

==============

下面是 ResultsBean 统一返回格式工具类

package com.sinosig.ewp.wx.service.config;

import lombok.Data;
import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Component;


/**
 * api 统一返回前端数据格式工具类
 * @author Mongo
 * @param
 * @return
 */
@Data
@Component
@Slf4j
public class ResultsBean {
    
    private Integer status;
    private Integer change;
    private String msg;
    private Object data;
    
    public static ResultsBean ok(Object data) {
        return new ResultsBean(data);
    }
    
    public static ResultsBean ok() {
        return new ResultsBean(ResponseStatusEnum.SUCCESS);
    }
    
    public static ResultsBean answerOperation(int answer) {
        if(answer > 0) {
            return ResultsBean.ok();
        }
        return ResultsBean.error();
    }
    
    public ResultsBean() {
        this.status = 200;
        this.msg = "success";
    }
    
    public ResultsBean(ResponseStatusEnum responseStatus) {
        this.status = responseStatus.status();
        this.msg = responseStatus.msg();
    }
    public ResultsBean(ResponseStatusEnum responseStatus, Object data) {
        this.status = responseStatus.status();
        this.msg = responseStatus.msg();
        this.data = data;
    }
    public ResultsBean(ResponseStatusEnum responseStatus, String msg) {
        this.status = responseStatus.status();
        this.msg = msg;
        
    }
    
    public static ResultsBean error() {
        return new ResultsBean(ResponseStatusEnum.FAILED);
    }
    
    public static ResultsBean errorCustom(ResponseStatusEnum responseStatus) {
        return new ResultsBean(responseStatus);
    }
    
    public static ResultsBean exception(ResponseStatusEnum responseStatus) {
        return new ResultsBean(responseStatus);
    }
    
    public static ResultsBean build(Integer status, String msg) {
        return new ResultsBean(status, msg, null);
    }
    public static ResultsBean build(ResponseStatusEnum responseStatus) {
        return new ResultsBean(responseStatus.status(), responseStatus.msg(), null);
    }
    
    public ResultsBean(Integer status, String msg, Object data) {
        this.status = status;
        this.msg = msg;
        this.data = data;
    }
    
    public ResultsBean(Object data) {
        this.status = 200;
        this.msg = "success";
        this.data = data;
    }
}

package com.sinosig.ewp.wx.service.config;

/**
 * 响应结果枚举，用于提供给JSON Result 统一格式化返回给前端
 * @author Mongo
 */
public enum ResponseStatusEnum {
    
    SUCCESS(200, true, "success"),//操作成功
    FAILED(500, false, "failure"),//操作失败
    FAILED_All(500, false, "failure_all"),//操作失败
    PARAM_NULL(101,false,"param_null"),//请求参数为空
    DATA_NULL(102,false,"data_null"),//返回数据为空
    OTHER_ERROR(103,false,"other_error"),//其他未知错误
    TOKEN_EXPIRE(104,false,"token_expire"),//token 失效
    
    ;
    
    private Integer status;//响应业务状态
    private Boolean success;//调用是否成功
    private String msg;//响应消息，可以为成功或者失败的消息
    
    public void setMsg(String msg) {
        this.msg = msg;
    }
    private String addMsg;//附加消息，会拼接在msg后面
    
    ResponseStatusEnum(Integer status, Boolean success, String msg) {
        this.status = status;
        this.success = success;
        this.msg = msg;
    }
    
    ResponseStatusEnum(Integer status, Boolean success, String msg, String addMsg) {
        this.status = status;
        this.success = success;
        this.msg = msg;
        this.addMsg = addMsg;
    }
    
    public Integer status() {
        return status;
    }
    public Boolean success() {
        return success;
    }
    public String msg() {
        return msg;
    }
}