以前写过一篇全局异常抓取以及日志log使用的文章, 今天我们再来单独优化一下这个全局异常抓取,并结合统一的接口返回类。
首先,我们先定义一个错误码接口(其实是返回码接口),里面包含返回码和错误描述,BaseErrorInfoInterface.java :
/**
* @Author:JCccc
* @Description:此接口用于返回码枚举使用
* @Date: created in 15:11 2019/5/3
*/
public interface BaseErrorInfoInterface {
/** 错误码*/
String getResultCode();
/** 错误描述*/
String getResultMsg();
}
然后是整一个返回码枚举类,CommonEnum.java实现上面的接口:
import com.soelegant.elegantdemo.common.base.BaseErrorInfoInterface;
/**
* @Author:JCccc
* @Description:
* @Date: created in 15:13 2019/5/3
*/
public enum CommonEnum implements BaseErrorInfoInterface {
// 数据操作错误定义
SUCCESS("200", "成功!"),
BODY_NOT_MATCH("400", "请求的数据格式不符!"),
SIGNATURE_NOT_MATCH("401", "请求的数字签名不匹配!"),
NOT_FOUND("404", "未找到该资源!"),
INTERNAL_SERVER_ERROR("500", "服务器内部错误!"),
SERVER_BUSY("503", "服务器正忙,请稍后再试!"),
REQUEST_METHOD_SUPPORT_ERROR("40001","当前请求方法不支持");
/**
* 错误码
*/
private String resultCode;
/**
* 错误描述
*/
private String resultMsg;
CommonEnum(String resultCode, String resultMsg) {
this.resultCode = resultCode;
this.resultMsg = resultMsg;
}
@Override
public String getResultCode() {
return resultCode;
}
@Override
public String getResultMsg() {
return resultMsg;
}
}
然后是响应接口的返回值类,ResultBody.java:
/**
* @Author:JCccc
* @Description:
* @Date: created in 15:19 2019/5/3
*/
public class ResultBody {
/**
* 响应代码
*/
private String code;
/**
* 响应消息
*/
private String message;
/**
* 响应结果
*/
private Object result;
public ResultBody() {
}
public ResultBody(BaseErrorInfoInterface errorInfo) {
this.code = errorInfo.getResultCode();
this.message = errorInfo.getResultMsg();
}
public String getCode() {
return code;
}
public void setCode(String code) {
this.code = code;
}
public String getMessage() {
return message;
}
public void setMessage(String message) {
this.message = message;
}
public Object getResult() {
return result;
}
public void setResult(Object result) {
this.result = result;
}
/**
* 成功
*
* @return
*/
public static ResultBody success() {
return success(null);
}
/**
* 成功
* @param data
* @return
*/
public static ResultBody success(Object data) {
ResultBody rb = new ResultBody();
rb.setCode(CommonEnum.SUCCESS.getResultCode());
rb.setMessage(CommonEnum.SUCCESS.getResultMsg());
rb.setResult(data);
return rb;
}
/**
* 失败
*/
public static ResultBody error(BaseErrorInfoInterface errorInfo) {
ResultBody rb = new ResultBody();
rb.setCode(errorInfo.getResultCode());
rb.setMessage(errorInfo.getResultMsg());
rb.setResult(null);
return rb;
}
/**
* 失败
*/
public static ResultBody error(String code, String message) {
ResultBody rb = new ResultBody();
rb.setCode(code);
rb.setMessage(message);
rb.setResult(null);
return rb;
}
/**
* 失败
*/
public static ResultBody error( String message) {
ResultBody rb = new ResultBody();
rb.setCode("-1");
rb.setMessage(message);
rb.setResult(null);
return rb;
}
@Override
public String toString() {
return JSONObject.toJSONString(this);
}
}
OK,到此关于返回码的东西以及大致完毕,我们现在开始写关于异常捕捉的。
首先写一个异常类继承RuntimeException, BizException.java:
/**
* @Author:JCccc
* @Description:
* @Date: created in 15:18 2019/5/3
*/
public class BizException extends RuntimeException {
private static final long serialVersionUID = 1L;
/**
* 错误码
*/
protected String errorCode;
/**
* 错误信息
*/
protected String errorMsg;
public BizException() {
super();
}
public BizException(BaseErrorInfoInterface errorInfoInterface) {
super(errorInfoInterface.getResultCode());
this.errorCode = errorInfoInterface.getResultCode();
this.errorMsg = errorInfoInterface.getResultMsg();
}
public BizException(BaseErrorInfoInterface errorInfoInterface, Throwable cause) {
super(errorInfoInterface.getResultCode(), cause);
this.errorCode = errorInfoInterface.getResultCode();
this.errorMsg = errorInfoInterface.getResultMsg();
}
public BizException(String errorMsg) {
super(errorMsg);
this.errorMsg = errorMsg;
}
public BizException(String errorCode, String errorMsg) {
super(errorCode);
this.errorCode = errorCode;
this.errorMsg = errorMsg;
}
public BizException(String errorCode, String errorMsg, Throwable cause) {
super(errorCode, cause);
this.errorCode = errorCode;
this.errorMsg = errorMsg;
}
public String getErrorCode() {
return errorCode;
}
public void setErrorCode(String errorCode) {
this.errorCode = errorCode;
}
public String getErrorMsg() {
return errorMsg;
}
public void setErrorMsg(String errorMsg) {
this.errorMsg = errorMsg;
}
public String getMessage() {
return errorMsg;
}
@Override
public Throwable fillInStackTrace() {
return this;
}
}
接着是,全局异常Handler, GlobalExceptionHandler.java:
/**
* @Author:JCccc
* @Description:
* @Date: created in 15:29 2019/5/3
*/
@ControllerAdvice
public class GlobalExceptionHandler {
private static final Logger logger = LoggerFactory.getLogger(GlobalExceptionHandler.class);
/**
* 处理自定义的业务异常
* @param req
* @param e
* @return
*/
@ExceptionHandler(value = BizException.class)
@ResponseBody
public ResultBody bizExceptionHandler(HttpServletRequest req, BizException e){
logger.error("发生业务异常!原因是:{}",e.getErrorMsg());
return ResultBody.error(e.getErrorCode(),e.getErrorMsg());
}
/**
* 处理空指针的异常
* @param req
* @param e
* @return
*/
@ExceptionHandler(value =NullPointerException.class)
@ResponseBody
public ResultBody exceptionHandler(HttpServletRequest req, NullPointerException e){
logger.error("发生空指针异常!原因是:",e);
return ResultBody.error(CommonEnum.BODY_NOT_MATCH);
}
/**
* 处理请求方法不支持的异常
* @param req
* @param e
* @return
*/
@ExceptionHandler(value =HttpRequestMethodNotSupportedException.class)
@ResponseBody
public ResultBody exceptionHandler(HttpServletRequest req, HttpRequestMethodNotSupportedException e){
logger.error("发生请求方法不支持异常!原因是:",e);
return ResultBody.error(CommonEnum.REQUEST_METHOD_SUPPORT_ERROR);
}
/**
* 处理其他异常
* @param req
* @param e
* @return
*/
@ExceptionHandler(value =Exception.class)
@ResponseBody
public ResultBody exceptionHandler(HttpServletRequest req, Exception e){
logger.error("未知异常!原因是:",e);
return ResultBody.error(CommonEnum.INTERNAL_SERVER_ERROR);
}
}
这里可以手动配置自己想抓取的异常以及处理返回码。
接着写个Controller来模拟一下异常抛出,抓取,使用统一返回码,UserController.java:
/**
* @Author:JCccc
* @Description:
* @Date: created in 15:50 2019/5/20
*/
@RestController
@RequestMapping("/user")
public class UserController {
@GetMapping("/test")
public boolean test() {
System.out.println("开始...");
//这里故意造成一个异常,并且不进行处理
Integer.parseInt("abc123");
return true;
}
@GetMapping("/testNull")
public boolean testNull() {
System.out.println("开始...");
//这里故意造成一个空指针的异常,并且不进行处理
String str=null;
str.equals("111");
return true;
}
@PostMapping("/testBizException")
public boolean testBizException() {
System.out.println("开始...");
//如果姓名为空就手动抛出一个自定义的异常!
String userName=null;
if(userName==null){
throw new BizException("-1","用户姓名不能为空!");
}
return true;
}
@GetMapping("/testSuccess")
public ResultBody testSuccess(){
Map map=new HashMap<>();
map.put("A","a");
map.put("B","b");
map.put("C","c");
return ResultBody.success(map);
}
@RequestMapping("/testError")
public ResultBody testError(){
return ResultBody.error("099","错误错误错误");
}
}
OK,接口的调用就不一一展示了,到此。