Spring Boot项目全局异常处理

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全局异常处理的方式。

这个我之前做营销网站的时候就想搞了，那时异常处理有点乱，重复代码很多，想想我自己也有点问题，没有往这方面想，现在想想有点后悔，希望以后别再犯类似的错。

统一异常处理加起来倒是不麻烦，可以减少重复代码，让看来更简洁易懂。

下面的代码只是粗略写写，实际应用中需要进行适当修改，但是思路是一样的。

1、定义枚举类 ResultCodeEnum

代码语言：javascript
复制
@Getter
public enum ResultCodeEnum {
    /**
     * 错误定义
     */
    SUCCESS(1000, "成功!"),
    BODY_NOT_MATCH(4000,"请求的数据格式不符!"),
    NOT_FOUND(4004, "未找到该资源!"),
    INTERNAL_SERVER_ERROR(5000, "服务器内部错误!"),
    SERVER_BUSY(5003,"服务器正忙，请稍后再试!"),
    SERVER_ERROR(9997,"业务异常");

private final int resultCode;

private final String resultMsg;

private ResultCodeEnum(int resultCode, String resultMsg) {
    this.resultCode = resultCode;
    this.resultMsg = resultMsg;
}



}

这里只是粗略写一下。

2、自定义异常类 BizException

代码语言：javascript
复制
@Data

public class BizException extends RuntimeException {


private final Integer resultCode;
private final String resultMsg;

public BizException() {
    this.resultCode = ResultCodeEnum.SERVER_ERROR.getResultCode();
    this.resultMsg = ResultCodeEnum.SERVER_ERROR.getResultMsg();
}

public BizException(ResultCodeEnum resultCodeEnum) {
    this.resultCode = resultCodeEnum.getResultCode();
    this.resultMsg = resultCodeEnum.getResultMsg();
}

public BizException(ResultCodeEnum resultCodeEnum, String msg) {
    this.resultCode = resultCodeEnum.getResultCode();
    this.resultMsg = resultCodeEnum.getResultMsg();
}

public BizException(int resultCode, String resultMsg) {
    this.resultCode = resultCode;
    this.resultMsg = resultMsg;
}



}

3、定义返回类 BaseResponse

代码语言：javascript
复制
@Data

public class BaseResponse {


private Integer resultCode;
private String resultMsg;


public BaseResponse() {
    this.resultCode = ResultCodeEnum.SUCCESS.getResultCode();
    this.resultMsg = ResultCodeEnum.SUCCESS.getResultMsg();
}

public BaseResponse(ResultCodeEnum resultCodeEnum) {
    this.resultCode = resultCodeEnum.getResultCode();
    this.resultMsg = resultCodeEnum.getResultMsg();
}

public BaseResponse(ResultCodeEnum resultCodeEnum, String msg) {
    this.resultCode = resultCodeEnum.getResultCode();
    this.resultMsg = msg;
}

public BaseResponse(int resultCode, String resultMsg) {
    this.resultCode = resultCode;
    this.resultMsg = resultMsg;
}



}

4、定义全局异常处理类

切记要加注解 @RestControllerAdvice

代码语言：javascript
复制
@Slf4j

@RestControllerAdvice

public class GlobalExceptionHandler {


public GlobalExceptionHandler() {
}

@ExceptionHandler({Throwable.class})
public BaseResponse handleThrowable(Throwable e) {
    log.error(e.getMessage(), e);
    return new BaseResponse(ResultCodeEnum.SERVER_ERROR.getResultCode(), e.getMessage());
}

@ExceptionHandler({Exception.class})
public BaseResponse handleException(Exception e) {
    log.error(e.getMessage(), e);
    return new BaseResponse(ResultCodeEnum.SERVER_BUSY.getResultCode(), e.getMessage());
}

@ExceptionHandler(value =NullPointerException.class)
public BaseResponse exceptionHandler(NullPointerException e){
    log.error(e.getMessage(), e);
    return new BaseResponse(ResultCodeEnum.BODY_NOT_MATCH);
}

@ExceptionHandler({BizException.class})
public BaseResponse handleBizException(BizException e) {
    return new BaseResponse(e.getResultCode(), e.getResultMsg());
}

@ExceptionHandler({IOException.class})
public BaseResponse handleIoException(IOException e) {
    log.error(e.getMessage(), e);
    return new BaseResponse(ResultCodeEnum.SERVER_ERROR.getResultCode(), "IO异常！");
}



}

5、测试

代码语言：javascript
复制
@Slf4j

@RestController

public class TestController {


@PostMapping("test")
public String test(@RequestBody User user) {
    if (user.getName() == null) {
        throw new BizException(4001, "name 参数不能为空");
    }

    return "success!";
}



}

代码结构如下：

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#异常处理