Springboot @RestControllerAdvice全局异常捕获处理

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文章目录

• 一、@RestControllerAdvice
• 二、案例
• • 1.自定义异常
  • 2.自定义相应常量
  • 3.自定义响应类
  • 4.核心逻辑
  • 5.测试

---

一、@RestControllerAdvice

@RestControllerAdvice是Spring框架提供的一个注解，用于定义全局异常处理器和全局数据绑定设置。它结合了@ControllerAdvice和@ResponseBody两个注解的功能。
通过在@RestControllerAdvice类中定义异常处理方法，我们可以捕获和处理控制器中抛出的异常，提供自定义的异常处理逻辑，以及返回适当的响应给客户端。

二、案例

1.自定义异常

package com.easyblog.exception;


import com.easyblog.entity.enums.ResponseCodeEnum;

public class BusinessException extends RuntimeException {

    private ResponseCodeEnum codeEnum;

    private Integer code;

    private String message;

    public BusinessException(String message, Throwable e) {
        super(message, e);
        this.message = message;
    }

    public BusinessException(String message) {
        super(message);
        this.message = message;
    }

    public BusinessException(Throwable e) {
        super(e);
    }

    public BusinessException(ResponseCodeEnum codeEnum) {
        super(codeEnum.getMsg());
        this.codeEnum = codeEnum;
        this.code = codeEnum.getCode();
        this.message = codeEnum.getMsg();
    }

    public BusinessException(Integer code, String message) {
        super(message);
        this.code = code;
        this.message = message;
    }

    public ResponseCodeEnum getCodeEnum() {
        return codeEnum;
    }

    public Integer getCode() {
        return code;
    }

    @Override
    public String getMessage() {
        return message;
    }

    /**
     * 重写fillInStackTrace 业务异常不需要堆栈信息，提高效率.
     */
    @Override
    public Throwable fillInStackTrace() {
        return this;
    }

}

2.自定义相应常量

package com.easyblog.entity.enums;

public enum ResponseCodeEnum {
    CODE_200(200, "请求成功"),
    CODE_404(404, "请求地址不存在"),
    CODE_600(600, "请求参数错误"),
    CODE_601(601, "信息已经存在"),
    CODE_602(602, "信息提交过多"),
    CODE_500(500, "服务器返回错误，请联系管理员"),
    CODE_900(900, "http请求超时"),
    CODE_901(901, "登录超时，请重新登录");

    private Integer code;

    private String msg;

    ResponseCodeEnum(Integer code, String msg) {
        this.code = code;
        this.msg = msg;
    }

    public Integer getCode() {
        return code;
    }

    public String getMsg() {
        return msg;
    }
}

3.自定义响应类

package com.easyblog.result;

import lombok.Data;

/**
 * 全局统一返回结果类
 */
@Data

public class Result<T> {
    private Integer code;
    private String message;

    private T data;

    public Result(){}

    protected static <T> Result<T> build(T data) {
        Result<T> result = new Result<T>();
        if (data != null)
            result.setData(data);
        return result;
    }

    public static <T> Result<T> build(T body, ResultCodeEnum resultCodeEnum) {
        Result<T> result = build(body);
        result.setCode(resultCodeEnum.getCode());
        result.setMessage(resultCodeEnum.getMessage());
        return result;
    }

    public static <T> Result<T> build(Integer code, String message) {
        Result<T> result = build(null);
        result.setCode(code);
        result.setMessage(message);
        return result;
    }

    public static<T> Result<T> ok(){
        return Result.ok(null);
    }

    /**
     * 操作成功
     * @param data
     * @param <T>
     * @return
     */
    public static<T> Result<T> ok(T data){
        Result<T> result = build(data);
        return build(data, ResultCodeEnum.SUCCESS);
    }

    public static<T> Result<T> fail(){
        return Result.fail(null);
    }

    /**
     * 操作失败
     * @param data
     * @param <T>
     * @return
     */
    public static<T> Result<T> fail(T data){
        Result<T> result = build(data);
        return build(data, ResultCodeEnum.FAIL);
    }

    public Result<T> message(String msg){
        this.setMessage(msg);
        return this;
    }

    public Result<T> code(Integer code){
        this.setCode(code);
        return this;
    }

    public boolean isOk() {
        if(this.getCode().intValue() == ResultCodeEnum.SUCCESS.getCode().intValue()) {
            return true;
        }
        return false;
    }
}

4.核心逻辑

package com.easyblog.exception;
import com.easyblog.entity.enums.ResponseCodeEnum;
import com.easyblog.result.Result;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.dao.DuplicateKeyException;
import org.springframework.validation.BindException;
import org.springframework.web.bind.annotation.ExceptionHandler;
import org.springframework.web.bind.annotation.RestControllerAdvice;
import org.springframework.web.servlet.NoHandlerFoundException;

import javax.servlet.http.HttpServletRequest;
/**
 * 全局异常捕获
 * 可以捕获和处理控制器中抛出的异常，提供自定义的异常处理逻辑，以及返回适当的响应给客户端。
 * **/
@RestControllerAdvice
public class GlobalExceptionHandlerController {

    @ExceptionHandler(value = Exception.class)
    Object handleException(Exception e, HttpServletRequest request) {
        Result response=new Result<>();
        //404
        if (e instanceof NoHandlerFoundException) {
            response.setCode(ResponseCodeEnum.CODE_404.getCode());
            response.setMessage(ResponseCodeEnum.CODE_404.getMsg());
        } else if (e instanceof BusinessException) {
            //业务错误
            BusinessException biz = (BusinessException) e;
            response.setCode(biz.getCode());
            if (biz.getCode() == null) {
                response.setCode(ResponseCodeEnum.CODE_600.getCode());
            }
            response.setMessage(biz.getMessage());
        } else if (e instanceof BindException) {
            //参数类型错误
            response.setCode(ResponseCodeEnum.CODE_600.getCode());
            response.setMessage(ResponseCodeEnum.CODE_600.getMsg());
        } else if (e instanceof DuplicateKeyException) {
            //主键冲突
            response.setCode(ResponseCodeEnum.CODE_601.getCode());
            response.setMessage(ResponseCodeEnum.CODE_601.getMsg());
        } else {
            response.setCode(ResponseCodeEnum.CODE_500.getCode());
            response.setMessage(ResponseCodeEnum.CODE_500.getMsg());
        }
        return response;
    }
}

其中@ExceptionHandler：用于指定异常处理方法。当与@RestControllerAdvice配合使用时，用于全局处理控制器里的异常。

5.测试