微服务架构之全局异常处理

一、定义全局异常处理类（GlobalExceptionHandler）
- 1、在cloud-common模块中创建全局异常处理类GlobalExceptionHandler
- 2、编写全局异常类代码
二、测试未使用全局异常捕捉方法异常
- 1、启动user模块进行测试
- 2、运行结果
三、测试使用全局异常捕捉方法异常
- 1、user测试编码
- 2、运行结果
四、Controller层使用@Valid +@RequestBody 校验入参对象属性

今天的学习内容是在微服务的公共模块中创建全局异常处理对象，对业务异常进行拦截处理，学完这篇将会学到从零开始也会编写全局异常处理类了。

我们在对业务进行处理时，当数据库操作失败，或遇到未受检测的异常时让 Service 层抛出运行时异常，Spring 事物管理器就会进行回滚。
但是我们就会在Controller层编写try-catch 捕捉Service 层的异常，然后进行错误信息封装再返回给客户端，否则会返回一些不友好的错误信息到客户端。但是，Controller 层每个方法体都写一些模板化的 try-catch 的代码，这样的代码很冗余、臃肿、难维护，而且要对 Service 层的不同异常进行不同处理，那么业务逻辑就会更复杂。
使用@ControllerAdvice + @ExceptionHandler 进行全局异常处理，可以简化Controller与Service层对业务异常的处理，使代码看起来更简洁、清晰、易维护。
@ControllerAdvice 使用在类上，@ExceptionHandler使用在方法上。

一、定义全局异常处理类（GlobalExceptionHandler）

1、在cloud-common模块中创建全局异常处理类GlobalExceptionHandler

cloud-common模块搭建请参考前面章节，链接：https://editor.csdn.net/md/?articleId=109964260

2、编写全局异常类代码

package yooo.yun.com.common.exception;import com.alibaba.fastjson.JSON;
import lombok.extern.slf4j.Slf4j;
import org.apache.shiro.authc.AuthenticationException;
import org.apache.shiro.authz.UnauthenticatedException;
import org.apache.shiro.authz.UnauthorizedException;
import org.springframework.http.HttpStatus;
import org.springframework.http.converter.HttpMessageNotReadableException;
import org.springframework.jdbc.BadSqlGrammarException;
import org.springframework.validation.BindingResult;
import org.springframework.validation.FieldError;
import org.springframework.web.HttpMediaTypeException;
import org.springframework.web.bind.MethodArgumentNotValidException;
import org.springframework.web.bind.annotation.ControllerAdvice;
import org.springframework.web.bind.annotation.ExceptionHandler;
import org.springframework.web.bind.annotation.ResponseStatus;
import org.springframework.web.bind.annotation.RestController;
import yooo.yun.com.common.api.ApiCode;
import yooo.yun.com.common.api.ApiResult;import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Objects;/*** @author wangjiao* @since 2020/11/14*/
@ControllerAdvice
@RestController
@Slf4j
public class GlobalExceptionHandler {/*** 非法参数验证异常** @param ex ex* @return res*/@ExceptionHandler(MethodArgumentNotValidException.class)@ResponseStatus(value = HttpStatus.OK)public ApiResult handleMethodArgumentNotValidExceptionHandler(MethodArgumentNotValidException ex) {BindingResult bindingResult = ex.getBindingResult();List<String> list = new ArrayList<>();List<FieldError> fieldErrors = bindingResult.getFieldErrors();for (FieldError fieldError : fieldErrors) {list.add(fieldError.getDefaultMessage());}Collections.sort(list);log.error("fieldErrors:[ex:{}]", JSON.toJSONString(list));return ApiResult.fail(ApiCode.PARAMETER_EXCEPTION, list);}/*** 系统登录异常处理** @param exception exception* @return res*/@ExceptionHandler(value = SysLoginException.class)@ResponseStatus(HttpStatus.OK)public ApiResult sysLoginExceptionHandler(SysLoginException exception) {log.warn("sysLoginExceptionHandler:系统登录异常[exception:{}]", exception.getMessage());return ApiResult.fail(ApiCode.LOGIN_EXCEPTION);}/*** HTTP解析请求参数异常** @param e e* @return res*/@ExceptionHandler(value = HttpMessageNotReadableException.class)@ResponseStatus(HttpStatus.OK)public ApiResult httpMessageNotReadableException(HttpMessageNotReadableException e) {log.error("httpMessageNotReadableException:[e:{}]", e.getMessage());return ApiResult.fail(ApiCode.PARAMETER_EXCEPTION, ApiCode.PARAMETER_PARSE_EXCEPTION);}/*** HTTP** @param exception exception* @return res*/@ExceptionHandler(value = HttpMediaTypeException.class)@ResponseStatus(HttpStatus.OK)public ApiResult httpMediaTypeException(HttpMediaTypeException exception) {log.error("httpMediaTypeException:[exception:{}]", exception.getMessage());return ApiResult.fail(ApiCode.PARAMETER_EXCEPTION, ApiCode.HTTP_MEDIA_TYPE_EXCEPTION);}/*** 自定义业务/数据异常处理** @param exception exception* @return res*/@ExceptionHandler(value = {SpringBootPlusException.class})@ResponseStatus(HttpStatus.OK)public ApiResult springBootPlusExceptionHandler(SpringBootPlusException exception) {log.error("springBootPlusException:[exception:{}]", exception.getMessage());int errorCode;if (exception instanceof BusinessException) {errorCode = ApiCode.BUSINESS_EXCEPTION.getCode();} else if (exception instanceof DaoException) {errorCode = ApiCode.DAO_EXCEPTION.getCode();} else if (exception instanceof VerificationCodeException) {errorCode = ApiCode.VERIFICATION_CODE_EXCEPTION.getCode();} else {errorCode = ApiCode.SPRING_BOOT_PLUS_EXCEPTION.getCode();}return new ApiResult().setCode(errorCode).setMsg(exception.getMessage());}/*** 登陆授权异常处理** @param exception exception* @return res*/@ExceptionHandler(value = AuthenticationException.class)@ResponseStatus(HttpStatus.OK)public ApiResult authenticationExceptionHandler(AuthenticationException exception) {log.error("authenticationExceptionHandler:[exception:{}]", exception.getMessage());return new ApiResult().setCode(ApiCode.AUTHENTICATION_EXCEPTION.getCode()).setMsg(exception.getMessage());}/*** 未认证异常处理** @param exception exception* @return res*/@ExceptionHandler(value = UnauthenticatedException.class)@ResponseStatus(HttpStatus.OK)public ApiResult unauthenticatedExceptionHandler(UnauthenticatedException exception) {log.error("unauthenticatedExceptionHandler:[exception:{}]", exception.getMessage());return ApiResult.fail(ApiCode.UNAUTHENTICATED_EXCEPTION);}/*** 未授权异常处理** @param exception exception* @return res*/@ExceptionHandler(value = UnauthorizedException.class)@ResponseStatus(HttpStatus.OK)public ApiResult unauthorizedExceptionHandler(UnauthorizedException exception) {log.error("unauthorizedExceptionHandler:[exception:{}]", exception.getMessage());return ApiResult.fail(ApiCode.UNAUTHORIZED_EXCEPTION);}/*** SQL 语法异常** @param exception exception* @return res*/@ExceptionHandler(value = BadSqlGrammarException.class)@ResponseStatus(HttpStatus.OK)public ApiResult badSqlGrammarException(BadSqlGrammarException exception) {log.info("badSqlGrammarException:[exception:{}]", exception.getMessage());return ApiResult.fail(ApiCode.SQL_ERROR_EXCEPTION);}/*** 默认的异常处理** @param exception exception* @return res*/@ExceptionHandler(value = Exception.class)@ResponseStatus(HttpStatus.OK)public ApiResult exceptionHandler(Exception exception) {log.error("exceptionHandler:[exception:{}]", exception.getMessage());if (Objects.nonNull(exception.getMessage())) {return ApiResult.fail(exception.getMessage());}return ApiResult.fail(ApiCode.SYSTEM_EXCEPTION);}
}

二、测试未使用全局异常捕捉方法异常

1、启动user模块进行测试

因为common模块是属于微服务的公共模块，所以其他微服务模块只需要在pom文件中引入common模块的依赖就可以直接使用common中配置的信息。
user模块引入common模块依赖

 <dependency><groupId>yooo.yun.com</groupId><artifactId>cloud-common</artifactId><version>1.0-SNAPSHOT</version><scope>compile</scope></dependency>

代码中Controller层使用try catch捕捉service抛出的异常，编码如下：

package yooo.yun.com.user.controller.saas;import com.alibaba.fastjson.JSON;
import io.swagger.annotations.ApiOperation;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.DigestUtils;
import org.springframework.web.bind.annotation.*;
import yooo.yun.com.common.api.ApiCode;
import yooo.yun.com.common.api.ApiResult;
import yooo.yun.com.common.entity.pojo.UserPoJo;
import yooo.yun.com.common.entity.request.UserLoginReq;
import yooo.yun.com.common.entity.request.UserReq;
import yooo.yun.com.user.service.UserService;import javax.annotation.Resource;
import javax.validation.Valid;
import java.util.Objects;/*** @author WangJiao* @since 2020/10/14*/
@Slf4j
@RequestMapping(value = "/saas/user")
@RestController("sUserC")
public class UserController {@Resource private UserService service;/*** 用户注册** @param req 注册信息* @return obj*/@PostMapping("/register")@ApiOperation("注册")public ApiResult register(@Valid @RequestBody UserReq req){log.info("register:[req:{}]", JSON.toJSONString(req));if (!Objects.equals(req.getPassword(), req.getRePassword())) {return ApiResult.fail(ApiCode.USER_TWO_PASSWORDS_INCONSISTENT);}try{UserPoJo findUser = service.getByTel(req.getTel());if (Objects.nonNull(findUser)) {return ApiResult.fail(ApiCode.USER_ACCOUNT_REGISTERED);}// md5加密req.setPassword(DigestUtils.md5DigestAsHex(req.getPassword().getBytes()));boolean res = service.save(UserPoJo.of(req));log.info("register:[res:{}]", res);return ApiResult.ok(res);}catch (Exception e) {e.printStackTrace();return ApiResult.fail(e.getMessage());}}
}

UserService编码：

package yooo.yun.com.user.service;import yooo.yun.com.common.entity.pojo.UserPoJo;
import yooo.yun.com.common.service.BaseService;/*** @author WangJiao* @since 2020/11/12*/
public interface UserService extends BaseService<UserPoJo> {/*** query user info by tel** @param tel the tel* @return user*/UserPoJo getByTel(String tel) throws Exception;
}

UserServiceImpl编码：

package yooo.yun.com.user.service.impl;import com.baomidou.mybatisplus.core.toolkit.Wrappers;
import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Service;
import yooo.yun.com.common.entity.pojo.UserPoJo;
import yooo.yun.com.common.service.Impl.BaseServiceImpl;
import yooo.yun.com.user.mapper.UserMapper;
import yooo.yun.com.user.service.UserService;import javax.annotation.Resource;/*** @author WangJiao* @since 2020/11/12*/
@Slf4j
@Service
public class UserServiceImpl extends BaseServiceImpl<UserMapper, UserPoJo> implements UserService {@Resource private UserMapper mapper;@Overridepublic UserPoJo getByTel(String tel) throws Exception{log.info("getByTel:[tel:{}]", tel);return mapper.selectOne(Wrappers.<UserPoJo>lambdaQuery().eq(UserPoJo::getTel, tel)) throws Exception;}
}

2、运行结果

sql异常，但是抛出了一段不友好的信息给客户端
所以我们只要对BadSqlGrammarException进行异常信息拦截，客户端只需要提示sql异常即可。

org.springframework.jdbc.BadSqlGrammarException: Error querying database.  Cause: com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: Table 'cloud_user.r_user' doesn't exist

三、测试使用全局异常捕捉方法异常

1、user测试编码

package yooo.yun.com.user.controller.saas;import com.alibaba.fastjson.JSON;
import io.swagger.annotations.ApiOperation;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.DigestUtils;
import org.springframework.web.bind.annotation.*;
import yooo.yun.com.common.api.ApiCode;
import yooo.yun.com.common.api.ApiResult;
import yooo.yun.com.common.entity.pojo.UserPoJo;
import yooo.yun.com.common.entity.request.UserLoginReq;
import yooo.yun.com.common.entity.request.UserReq;
import yooo.yun.com.user.service.UserService;import javax.annotation.Resource;
import javax.validation.Valid;
import java.util.Objects;/*** @author WangJiao* @since 2020/10/14*/
@Slf4j
@RequestMapping(value = "/saas/user")
@RestController("sUserC")
public class UserController {@Resource private UserService service;/*** 用户注册** @param req 注册信息* @return obj*/@PostMapping("/register")@ApiOperation("注册")public ApiResult register(@Valid @RequestBody UserReq req){log.info("register:[req:{}]", JSON.toJSONString(req));if (!Objects.equals(req.getPassword(), req.getRePassword())) {return ApiResult.fail(ApiCode.USER_TWO_PASSWORDS_INCONSISTENT);}UserPoJo findUser = service.getByTel(req.getTel());if (Objects.nonNull(findUser)) {return ApiResult.fail(ApiCode.USER_ACCOUNT_REGISTERED);}// md5加密req.setPassword(DigestUtils.md5DigestAsHex(req.getPassword().getBytes()));boolean res = service.save(UserPoJo.of(req));log.info("register:[res:{}]", res);return ApiResult.ok(res);}
}

UserService代码：

package yooo.yun.com.user.service;import yooo.yun.com.common.entity.pojo.UserPoJo;
import yooo.yun.com.common.service.BaseService;/*** @author WangJiao* @since 2020/11/12*/
public interface UserService extends BaseService<UserPoJo> {/*** query user info by tel** @param tel the tel* @return user*/UserPoJo getByTel(String tel);
}

UserServiceImpl实现类编码：

package yooo.yun.com.user.service.impl;import com.baomidou.mybatisplus.core.toolkit.Wrappers;
import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Service;
import yooo.yun.com.common.entity.pojo.UserPoJo;
import yooo.yun.com.common.service.Impl.BaseServiceImpl;
import yooo.yun.com.user.mapper.UserMapper;
import yooo.yun.com.user.service.UserService;import javax.annotation.Resource;/*** @author WangJiao* @since 2020/11/12*/
@Slf4j
@Service
public class UserServiceImpl extends BaseServiceImpl<UserMapper, UserPoJo> implements UserService {@Resource private UserMapper mapper;@Overridepublic UserPoJo getByTel(String tel) {log.info("getByTel:[tel:{}]", tel);return mapper.selectOne(Wrappers.<UserPoJo>lambdaQuery().eq(UserPoJo::getTel, tel));}
}

2、运行结果

返回友好的信息给客户端。
原因是我们定义的全局异常类对业务层抛出的异常进行了拦截处理，这一段代码处理如下：

  /* SQL 语法异常** @param exception exception* @return res*/@ExceptionHandler(value = BadSqlGrammarException.class)@ResponseStatus(HttpStatus.OK)public ApiResult badSqlGrammarException(BadSqlGrammarException exception) {log.info("badSqlGrammarException:[exception:{}]", exception.getMessage());return ApiResult.fail(ApiCode.SQL_ERROR_EXCEPTION);}

四、Controller层使用@Valid +@RequestBody 校验入参对象属性

@Valid +@RequestBody作用于Post或Put接口，校验对象中的基础属性字段，简化校验操作，减少对空参数的校验。
user入参对象编码如下：

package yooo.yun.com.common.entity.request;import io.swagger.annotations.ApiModel;
import io.swagger.annotations.ApiModelProperty;
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;import javax.validation.constraints.NotBlank;
import java.io.Serializable;/*** 用户表** @author WangJiao* @since 2019-12-19*/
@Data
@AllArgsConstructor
@NoArgsConstructor
@ApiModel("用户信息请求")
public class UserReq implements Serializable {private static final long serialVersionUID = 1L;@NotBlank(message = "电话不能为空")@ApiModelProperty(value = "电话", example = "15675454322")private String tel;@NotBlank(message = "密码不能为空")@ApiModelProperty(value = "密码", example = "yyy23")private String password;@NotBlank(message = "确认密码不能为空")@ApiModelProperty(value = "确认密码", example = "yyy23")private String rePassword;@ApiModelProperty(value = "用户头像", example = "http://test.jpg")private String avatar;@NotBlank(message = "用户名不能为空")@ApiModelProperty(value = "姓名", example = "周深")private String name;public static UserReq of() {return new UserReq();}
}

测试方法

 /*** 用户注册** @param req 注册信息* @return obj*/@PostMapping("/register")@ApiOperation("注册")public ApiResult register(@Valid @RequestBody UserReq req){log.info("register:[req:{}]", JSON.toJSONString(req));if (!Objects.equals(req.getPassword(), req.getRePassword())) {return ApiResult.fail(ApiCode.USER_TWO_PASSWORDS_INCONSISTENT);}UserPoJo findUser = service.getByTel(req.getTel());if (Objects.nonNull(findUser)) {return ApiResult.fail(ApiCode.USER_ACCOUNT_REGISTERED);}// md5加密req.setPassword(DigestUtils.md5DigestAsHex(req.getPassword().getBytes()));boolean res = service.save(UserPoJo.of(req));log.info("register:[res:{}]", res);return ApiResult.ok(res);}
}

测试结果：
控制台打印的错误信息如下：

2020-11-24 14:40:36.875 ERROR 21372 [nio-5050-exec-1] y.y.c.c.e.GlobalExceptionHandler         [53] : fieldErrors:[ex:["密码不能为空"]]
org.springframework.web.bind.MethodArgumentNotValidException: Validation failed for argument at index 0 in method: public yooo.yun.com.common.api.ApiResult yooo.yun.com.user.controller.saas.UserController.register(yooo.yun.com.common.entity.request.UserReq), with 1 error(s): [Field error in object 'userReq' on field 'password': rejected value []; codes [NotBlank.userReq.password,NotBlank.password,NotBlank.java.lang.String,NotBlank];arguments [org.springframework.context.support.DefaultMessageSourceResolvable: codes [userReq.password,password]; arguments []; default message [password]]; default message [密码不能为空]]  at org.springframework.web.servlet.mvc.method.annotation.RequestResponseBodyMethodProcessor.resolveArgument(RequestResponseBodyMethodProcessor.java:138) at org.springframework.web.method.support.HandlerMethodArgumentResolverComposite.resolveArgument(HandlerMethodArgumentResolverComposite.java:124) at org.springframework.web.method.support.InvocableHandlerMethod.getMethodArgumentValues(InvocableHandlerMethod.java:161) at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:131) at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:102) at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:891) at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:797) at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87) at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:991) at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:925) at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:981) at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:884) at javax.servlet.http.HttpServlet.service(HttpServlet.java:661) at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:858) at javax.servlet.http.HttpServlet.service(HttpServlet.java:742) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) at org.springframework.boot.actuate.web.trace.servlet.HttpTraceFilter.doFilterInternal(HttpTraceFilter.java:90) at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:99) at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) at org.springframework.web.filter.HttpPutFormContentFilter.doFilterInternal(HttpPutFormContentFilter.java:109) at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) at org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:93) at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) at org.springframework.boot.actuate.metrics.web.servlet.WebMvcMetricsFilter.filterAndRecordMetrics(WebMvcMetricsFilter.java:117) at org.springframework.boot.actuate.metrics.web.servlet.WebMvcMetricsFilter.doFilterInternal(WebMvcMetricsFilter.java:106) at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:200) at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:198) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96) at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:493) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:140) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:81) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:342) at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:800) at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66) at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:806) at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1498) at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) at java.lang.Thread.run(Thread.java:748)

全局异常对非法参数异常进行了封装，返回友好的提示给前端：

/*** 非法参数验证异常** @param ex ex* @return res*/@ExceptionHandler(MethodArgumentNotValidException.class)@ResponseStatus(value = HttpStatus.OK)public ApiResult handleMethodArgumentNotValidExceptionHandler(MethodArgumentNotValidException ex) {BindingResult bindingResult = ex.getBindingResult();List<String> list = new ArrayList<>();List<FieldError> fieldErrors = bindingResult.getFieldErrors();for (FieldError fieldError : fieldErrors) {list.add(fieldError.getDefaultMessage());}Collections.sort(list);log.error("fieldErrors:[ex:{}]", JSON.toJSONString(list));return ApiResult.fail(ApiCode.PARAMETER_EXCEPTION, list);}

-_- 到这里，说明你已经get到了喔！需要的小伙伴，快动手练练吧！

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微服务架构之全局异常（@ControllerAdvice + @ExceptionHandler）

微服务架构之全局异常处理

一、定义全局异常处理类（GlobalExceptionHandler）

1、在cloud-common模块中创建全局异常处理类GlobalExceptionHandler

2、编写全局异常类代码

二、测试未使用全局异常捕捉方法异常

1、启动user模块进行测试

2、运行结果

三、测试使用全局异常捕捉方法异常

1、user测试编码

2、运行结果

四、Controller层使用@Valid +@RequestBody 校验入参对象属性

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