SpringCloud微服务实战——搭建企业级开发框架（七）：自定义通用响应消息及统一异常处理
平时开发过程中，无可避免我们需要处理各类异常，所以这里我们在公共模块中自定义统一异常，Spring Boot 提供 @RestControllerAdvice 注解统一异常处理，我们在GitEgg_Platform中新建gitegg-platform-boot子工程，此工程主要用于Spring Boot相关功能的自定义及扩展。
1、修改gitegg-platform-boot的pom.xml，添加spring-boot-starter-web和swagger依赖，设置optional为true，让这个包在项目之间依赖不传递。
<dependency>
<groupid>org.springframework.boot</groupid>
<artifactid>spring-boot-starter-web</artifactid>
<optional>true</optional>
</dependency>
<dependency>
<groupid>com.gitegg.platform</groupid>
<artifactid>gitegg-platform-swagger</artifactid>
<optional>true</optional>
</dependency>
2、自定义通用响应消息类，Result和PageResult，一个是普通响应消息，一个是分页响应消息。
Result类：
package com.gitegg.platform.boot.common.base;
import com.gitegg.platform.boot.common.enums.ResultCodeEnum;
import io.swagger.annotations.ApiModel;
import io.swagger.annotations.ApiModelProperty;
import lombok.*;
/**
* @ClassName: Result
* @Description: 自定义通用响应类
* @author GitEgg
* @date 2020年09月19日 下午9:24:50
*/
@ApiModel(description = "通用响应类")
@Getter
@ToString
public class Result<T> {
@ApiModelProperty(value = "是否成功", required = true)
private boolean success;
@ApiModelProperty(value ="响应代码", required = true)
private int code;
@ApiModelProperty(value ="提示信息", required = true)
private String msg;
@ApiModelProperty(value ="响应数据")
private T data;
/**
*
* @param code
* @param data
* @param msg
*/
private Result(int code, T data, String msg) {
this.success = ResultCodeEnum.SUCCESS.code == code;
this.code = code;
this.msg = msg;
this.data = data;
}
/**
*
* @param resultCodeEnum
*/
private Result(ResultCodeEnum resultCodeEnum ) {
this(resultCodeEnum.code, null, resultCodeEnum.msg);
}
/**
*
* @param resultCodeEnum
* @param msg
*/
private Result(ResultCodeEnum resultCodeEnum , String msg) {
this(resultCodeEnum, null, msg);
}
/**
*
* @param resultCodeEnum
* @param data
*/
private Result(ResultCodeEnum resultCodeEnum , T data) {
this(resultCodeEnum, data, resultCodeEnum.msg);
}
/**
*
* @param resultCodeEnum
* @param data
* @param msg
*/
private Result(ResultCodeEnum resultCodeEnum , T data, String msg) {
this(resultCodeEnum.code, data, msg);
}
/**
*
*
* @param data 数据
* @param <T> T 响应数据
* @
*/
public static <T> Result<T> data(T data) {
return data(data, ResultCodeEnum.SUCCESS.msg);
}
/**
*
*
* @param data 数据
* @param msg 消息
* @param <t> T 响应数据
* @
*/
public static <t> Result<t> data(T data, String msg) {
return data(ResultCodeEnum.SUCCESS.code, data, msg);
}
/**
*
*
* @param code 状态码
* @param data 数据
* @param msg 消息
* @param <T> T 响应数据
* @
*/
public static <T> Result<T> data(int code, T data, String msg) {
return new Result<>(code, data, msg);
}
/**
* 返回Result
*
* @param
* @param <T> T 响应数据
* @返回Result
*/
public static <T> Result<T> success() {
return new Result<>(ResultCodeEnum.SUCCESS);
}
/**
* 返回Result
*
* @param msg 消息
* @param <T> T 响应数据
* @返回Result
*/
public static <T> Result<T> success(String msg) {
return new Result<>(ResultCodeEnum.SUCCESS, msg);
}
/**
* 返回Result
*
* @param
* @param <T> T 响应数据
* @返回Result
*/
public static <T> Result<T> success(ResultCodeEnum resultCodeEnum ) {
return new Result<>(resultCodeEnum);
}
/**
* 返回Result
*
* @param
* @param msg 提示信息
* @param <T> T 响应数据
* @返回Result
*/
public static <T> Result<T> success(ResultCodeEnum resultCodeEnum , String msg) {
return new Result<>(resultCodeEnum, msg);
}
/**
* 返回Result
*
* @param <T> T 响应数据
* @返回Result
*/
public static <T> Result<T> error() {
return new Result<>(ResultCodeEnum.ERROR, ResultCodeEnum.ERROR.msg);
}
/**
* 返回Result
*
* @param msg 消息
* @param <T> T 响应数据
* @返回Result
*/
public static <T> Result<T> error(String msg) {
return new Result<>(ResultCodeEnum.ERROR, msg);
}
/**
* 返回Result
*
* @param code 状态码
* @param msg 消息
* @param <T> T 响应数据
* @返回Result
*/
public static <T> Result<T> error(int code, String msg) {
return new Result<>(code, null, msg);
}
/**
* 返回Result
*
* @param
* @param <T> T 响应数据
* @返回Result
*/
public static <T> Result<T> error(ResultCodeEnum resultCodeEnum ) {
return new Result<>(resultCodeEnum);
}
/**
* 返回Result
*
* @param
* @param msg 提示信息
* @param <T> T 响应数据
* @返回Result
*/
public static <T> Result<T> error(ResultCodeEnum resultCodeEnum , String msg) {
return new Result<>(resultCodeEnum, msg);
}
/**
*
* @param <T>
* @param flag
* @return
*/
public static <T> Result<T> result(boolean flag) {
return flag ? Result.success("操作成功") : Result.error("操作失败");
}
}
PageResult类：
package com.gitegg.platform.boot.common.base;
import java.util.List;
import com.gitegg.platform.boot.common.enums.ResultCodeEnum;
import io.swagger.annotations.ApiModel;
import io.swagger.annotations.ApiModelProperty;
import lombok.Data;
/**
* @ClassName: PageResult
* @Description: 通用分页返回
* @author GitEgg
* @date
* @param <T>
*/
@Data
@ApiModel("通用分页响应类")
public class PageResult<T> {
@ApiModelProperty(value = "是否成功", required = true)
private boolean success;
@ApiModelProperty(value ="响应代码", required = true)
private int code;
@ApiModelProperty(value ="提示信息", required = true)
private String msg;
@ApiModelProperty(value ="总数量", required = true)
private long count;
@ApiModelProperty(value ="分页数据")
private List<T> data;
public PageResult(long total, List<T> rows) {
this.count = total;
this.data = rows;
this.code = ResultCodeEnum.SUCCESS.code;
this.msg = ResultCodeEnum.SUCCESS.msg;
}
}
3、自定义通用响应消息枚举类ResultCodeEnum。
package com.gitegg.platform.boot.common.enums;
/**
* @ClassName: ResultCodeEnum
* @Description: 自定义返回码枚举
* @author GitEgg
* @date 2020年09月19日 下午11:49:45
*/
public enum ResultCodeEnum {
/**
* 成功
*/
SUCCESS(200, "操作成功"),
/**
* 系统错误
*/
ERROR(500, "系统错误"),
/**
* 操作失败
*/
FAILED(101, "操作失败"),
/**
* 未登录/登录超时
*/
UNAUTHORIZED(102, "登录超时"),
/**
* 参数错误
*/
PARAM_ERROR(103, "参数错误"),
/**
* 参数错误-已存在
*/
INVALID_PARAM_EXIST(104, "请求参数已存在"),
/**
* 参数错误
*/
INVALID_PARAM_EMPTY(105, "请求参数为空"),
/**
* 参数错误
*/
PARAM_TYPE_MISMATCH(106, "参数类型不匹配"),
/**
* 参数错误
*/
PARAM_VALID_ERROR(107, "参数校验失败"),
/**
* 参数错误
*/
ILLEGAL_REQUEST(108, "非法请求"),
/**
* 验证码错误
*/
INVALID_VCODE(204, "验证码错误"),
/**
* 用户名或密码错误
*/
INVALID_USERNAME_PASSWORD(205, "账号或密码错误"),
/**
*
*/
INVALID_RE_PASSWORD(206, "两次输入密码不一致"),
/**
* 用户名或密码错误
*/
INVALID_OLD_PASSWORD(207, "旧密码错误"),
/**
* 用户名重复
*/
USERNAME_ALREADY_IN(208, "用户名已存在"),
/**
* 用户不存在
*/
INVALID_USERNAME(209, "用户名不存在"),
/**
* 角色不存在
*/
INVALID_ROLE(210, "角色不存在"),
/**
* 角色不存在
*/
ROLE_USED(211, "角色使用中，不可删除"),
/**
* 没有权限
*/
NO_PERMISSION(403, "当前用户无该接口权限");
public int code;
public String msg;
ResultCodeEnum(int code, String msg) {
this.code = code;
this.msg = msg;
}
public int getCode() {
return code;
}
public void setCode(int code) {
this.code = code;
}
public String getMsg() {
return msg;
}
public void setMsg(String msg) {
this.msg = msg;
}
}
4、自定义异常类BusinessException和SystemException
package com.gitegg.platform.boot.common.exception;
import com.gitegg.platform.boot.common.enums.ResultCodeEnum;
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.Getter;
import lombok.Setter;
/**
* @ClassName: BusinessException
* @Description: 业务处理异常
* @author GitEgg
* @date
*/
@Getter
@Setter
public class BusinessException extends RuntimeException {
private int code;
private String msg;
public BusinessException() {
this.code = ResultCodeEnum.FAILED.code;
this.msg = ResultCodeEnum.FAILED.msg;
}
public BusinessException(String message) {
this.code = ResultCodeEnum.FAILED.code;
this.msg = message;
}
public BusinessException(int code, String msg) {
this.code = code;
this.msg = msg;
}
public BusinessException(Throwable cause) {
super(cause);
}
public BusinessException(String message, Throwable cause) {
super(message, cause);
}
}
package com.gitegg.platform.boot.common.exception;
import com.gitegg.platform.boot.common.enums.ResultCodeEnum;
import lombok.Getter;
/**
* @ClassName: SystemException
* @Description: 系统处理异常
* @author GitEgg
* @date
*/
@Getter
public class SystemException extends RuntimeException {
private int code;
private String msg;
public SystemException() {
this.code = ResultCodeEnum.ERROR.code;
this.msg = ResultCodeEnum.ERROR.msg;
}
public SystemException(String message) {
this.code = ResultCodeEnum.ERROR.code;
this.msg = message;
}
public SystemException(int code, String msg) {
this.code = code;
this.msg = msg;
}
public SystemException(Throwable cause) {
super(cause);
}
public SystemException(String message, Throwable cause) {
super(message, cause);
}
}
5、自定义统一异常处理类GitEggControllerAdvice.java
package com.gitegg.platform.boot.common.advice;
import com.gitegg.platform.boot.common.base.Result;
import com.gitegg.platform.boot.common.enums.ResultCodeEnum;
import com.gitegg.platform.boot.common.exception.BusinessException;
import com.gitegg.platform.boot.common.exception.SystemException;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.http.converter.HttpMessageNotReadableException;
import org.springframework.ui.Model;
import org.springframework.web.HttpMediaTypeNotAcceptableException;
import org.springframework.web.HttpMediaTypeNotSupportedException;
import org.springframework.web.HttpRequestMethodNotSupportedException;
import org.springframework.web.bind.MethodArgumentNotValidException;
import org.springframework.web.bind.MissingPathVariableException;
import org.springframework.web.bind.MissingServletRequestParameterException;
import org.springframework.web.bind.WebDataBinder;
import org.springframework.web.bind.annotation.ExceptionHandler;
import org.springframework.web.bind.annotation.InitBinder;
import org.springframework.web.bind.annotation.ModelAttribute;
import org.springframework.web.bind.annotation.RestControllerAdvice;
import org.springframework.web.method.annotation.MethodArgumentTypeMismatchException;
import org.springframework.web.servlet.NoHandlerFoundException;
import javax.annotation.PostConstruct;
import javax.servlet.http.HttpServletRequest;
import javax.validation.ConstraintViolationException;
@Slf4j
@RestControllerAdvice
public class GitEggControllerAdvice {
/**
* 服务名
*/
@Value("${spring.application.name}")
private String serverName;
/**
* 微服务系统标识
*/
private String errorSystem;
@PostConstruct
public void init() {
this.errorSystem = new StringBuffer()
.append(this.serverName)
.append(": ").toString();
}
/**
* 应用到所有@RequestMapping注解方法，在其执行之前初始化数据绑定器
*/
@InitBinder
public void initBinder(WebDataBinder binder) {
}
/**
* 把值绑定到Model中，使全局@RequestMapping可以获取到该值
*/
@ModelAttribute
public void addAttributes(Model model) {
}
/**
* 全局异常捕捉处理
*/
@ExceptionHandler(value = {Exception.class})
public Result handlerException(Exception exception, HttpServletRequest request) {
log.error("请求路径uri={},系统内部出现异常:{}", request.getRequestURI(), exception);
Result result = Result.error(ResultCodeEnum.ERROR, errorSystem + exception.toString());
return result;
}
/**
* 非法请求异常
*/
@ExceptionHandler(value = {
HttpMediaTypeNotAcceptableException.class,
HttpMediaTypeNotSupportedException.class,
HttpRequestMethodNotSupportedException.class,
MissingServletRequestParameterException.class,
NoHandlerFoundException.class,
MissingPathVariableException.class,
HttpMessageNotReadableException.class
})
public Result handlerSpringAOPException(Exception exception) {
Result result = Result.error(ResultCodeEnum.ILLEGAL_REQUEST, errorSystem + exception.getMessage());
return result;
}
/**
* 非法请求异常-参数类型不匹配
*/
@ExceptionHandler(value = MethodArgumentTypeMismatchException.class)
public Result handlerSpringAOPException(MethodArgumentTypeMismatchException exception) {
Result result = Result.error(ResultCodeEnum.PARAM_TYPE_MISMATCH, errorSystem + exception.getMessage());
return result;
}
/**
* 非法请求-参数校验
*/
@ExceptionHandler(value = {MethodArgumentNotValidException.class})
public Result handlerMethodArgumentNotValidException(MethodArgumentNotValidException methodArgumentNotValidException) {
//获取异常字段及对应的异常信息
StringBuffer stringBuffer = new StringBuffer();
methodArgumentNotValidException.getBindingResult().getFieldErrors().stream()
.map(t -> t.getField()+"=>"+t.getDefaultMessage()+" ")
.forEach(e -> stringBuffer.append(e));
String errorMessage = stringBuffer.toString();
Result result = Result.error(ResultCodeEnum.PARAM_VALID_ERROR, errorSystem + errorMessage);
return result;
}
/**
* 非法请求异常-参数校验
*/
@ExceptionHandler(value = {ConstraintViolationException.class})
public Result handlerConstraintViolationException(ConstraintViolationException constraintViolationException) {
String errorMessage = constraintViolationException.getLocalizedMessage();
Result result = Result.error(ResultCodeEnum.PARAM_VALID_ERROR, errorSystem + errorMessage);
return result;
}
/**
* 自定义业务异常-BusinessException
*/
@ExceptionHandler(value = {BusinessException.class})
public Result handlerCustomException(BusinessException exception) {
String errorMessage = exception.getMsg();
Result result = Result.error(exception.getCode(), errorSystem + errorMessage);
return result;
}
/**
* 自定义系统异常-SystemException
*/
@ExceptionHandler(value = {SystemException.class})
public Result handlerCustomException(SystemException exception) {
String errorMessage = exception.getMsg();
Result result = Result.error(exception.getCode(), errorSystem + errorMessage);
return result;
}
}
6、重新将GitEgg-Platform进行install，在GitEgg-Cloud中的gitegg-service引入gitegg-platform-boot
<!--?xml version="1.0" encoding="UTF-8"?-->
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemalocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<parent>
<artifactid>GitEgg-Cloud</artifactid>
<groupid>com.gitegg.cloud</groupid>
<version>1.0-SNAPSHOT</version>
</parent>
<modelversion>4.0.0</modelversion>
<artifactid>gitegg-service</artifactid>
<packaging>pom</packaging>
<modules>
<module>gitegg-service-base</module>
<module>gitegg-service-bigdata</module>
<module>gitegg-service-system</module>
</modules>
<dependencies>
<!-- gitegg Spring Boot自定义及扩展 -->
<dependency>
<groupid>com.gitegg.platform</groupid>
<artifactid>gitegg-platform-boot</artifactid>
</dependency>
<!-- gitegg数据库驱动及连接池 -->
<dependency>
<groupid>com.gitegg.platform</groupid>
<artifactid>gitegg-platform-db</artifactid>
</dependency>
<!-- gitegg mybatis-plus -->
<dependency>
<groupid>com.gitegg.platform</groupid>
<artifactid>gitegg-platform-mybatis</artifactid>
</dependency>
<!-- gitegg swagger2-knife4j -->
<dependency>
<groupid>com.gitegg.platform</groupid>
<artifactid>gitegg-platform-swagger</artifactid>
</dependency>
<!-- spring boot web核心包 -->
<dependency>
<groupid>org.springframework.boot</groupid>
<artifactid>spring-boot-starter-web</artifactid>
</dependency>
<!-- spring boot 健康监控 -->
<dependency>
<groupid>org.springframework.boot</groupid>
<artifactid>spring-boot-starter-actuator</artifactid>
</dependency>
</dependencies>
</project>
7、修改SystemController.java、ISystemService.java和SystemServiceImpl.java增加异常处理的测试代码
SystemController.java:
package com.gitegg.service.system.controller;
import com.gitegg.platform.boot.common.base.Result;
import com.gitegg.platform.boot.common.exception.BusinessException;
import com.gitegg.service.system.service.ISystemService;
import io.swagger.annotations.Api;
import io.swagger.annotations.ApiOperation;
import lombok.AllArgsConstructor;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
@RestController
@RequestMapping(value = "system")
@AllArgsConstructor
@Api(tags = "gitegg-system")
public class SystemController {
private final ISystemService systemService;
@GetMapping(value = "list")
@ApiOperation(value = "system list接口")
public Object list() {
return systemService.list();
}
@GetMapping(value = "page")
@ApiOperation(value = "system page接口")
public Object page() {
return systemService.page();
}
@GetMapping(value = "exception")
@ApiOperation(value = "自定义异常及返回测试接口")
public Result<string> exception() {
return Result.data(systemService.exception());
}
}
ISystemService.java:
package com.gitegg.service.system.service;
import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
import com.gitegg.service.system.entity.SystemTable;
import java.util.List;
public interface ISystemService {
List<systemtable> list();
Page<systemtable> page();
String exception();
}
SystemServiceImpl.java:
package com.gitegg.service.system.service.impl;
import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
import com.gitegg.platform.boot.common.exception.BusinessException;
import com.gitegg.service.system.entity.SystemTable;
import com.gitegg.service.system.mapper.SystemTableMapper;
import com.gitegg.service.system.service.ISystemService;
import lombok.AllArgsConstructor;
import org.springframework.stereotype.Service;
import java.util.List;
/**
*
*/
@Service
@AllArgsConstructor
public class SystemServiceImpl implements ISystemService {
private final SystemTableMapper systemTableMapper;
@Override
public List<systemtable> list() {
return systemTableMapper.list();
}
@Override
public Page<systemtable> page() {
Page<systemtable> page = new Page<>(1, 10);
List<systemtable> records = systemTableMapper.page(page);
page.setRecords(records);
return page;
}
@Override
public String exception() {
throw new BusinessException("自定义异常");
// return "成功获得数据";
}
}
8、运行GitEggSystemApplication，打开浏览器访问：http://127.0.0.1:8001/doc.html，然后点击左侧的异常处理接口，使用Swagger2进行测试，即可看到结果
本文源码在https://gitee.com/wmz1930/GitEgg 的chapter-07分支。
