接到将请求返回值写入到日志方便查问题需求,首先考虑的是用拦截器实现,无奈拦截器postHandle方法里获取不到返回值就此作罢。继续寻找新的方法,网上查询一番找到一个便捷的方法,利用log4j2,在log4j2.xml配置文件里添加如下配置:
<AsyncLogger name="org.springframework.web.servlet.mvc.method.annotation.RequestResponseBodyMethodProcessor" level="debug" additivity="false"> <AppenderRef ref="Console"/> <AppenderRef ref="allLog"/> </AsyncLogger>
这样就能将方法返回值记录到日志里了,但是这样记录的日志和系统其它日志不一样不方便查看,此方法pass。最后只能用spring aop来实现此功能了,步骤如下:
1、引入aop依赖的jar包
<dependency> <groupId>org.springframework</groupId> <artifactId>spring-aop</artifactId> <version>4.0.0.RELEASE</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-aspects</artifactId> <version>4.0.0.RELEASE</version> </dependency>
2、配置xml文件
引入aop命名空间
xmlns:aop="http://www.springframework.org/schema/aop"
http://www.springframework.org/schema/aop
http://www.springframework.org/schema/aop/spring-aop-4.0.xsd
<!-- 开启自动切面代理 --> <aop:aspectj-autoproxy/> <!-- 使用annotation 自动注册bean --> <context:component-scan base-package="com.zzz.dealer.**"/>
3、编写切面类
@Aspect //指定当前类为切面类 @Component //把普通pojo实例化到spring容器中,相当于配置文件中的<bean id="" class=""/> public class MethodLogAndExceptionAop { @Around("@annotation(org.springframework.web.bind.annotation.RequestMapping)") public Object around(ProceedingJoinPoint jp) throws Throwable { String targetName = jp.getTarget().getClass().getName(); String methodName = jp.getSignature().getName(); Object[] arguments = jp.getArgs(); Object[] args = new Object[arguments.length]; for (int i = 0; i < arguments.length; i++) { if (arguments[i] instanceof ServletRequest || arguments[i] instanceof ServletResponse || arguments[i] instanceof MultipartFile) { //ServletRequest不能序列化,从入参里排除,否则报异常:java.lang.IllegalStateException: It is illegal to call this method if the current request is not in asynchronous mode (i.e. isAsyncStarted() returns false) //ServletResponse不能序列化 从入参里排除,否则报异常:java.lang.IllegalStateException: getOutputStream() has already been called for this response continue; } args[i] = arguments[i]; } Object result = null; try { //StopWatch 计时 StopWatch clock = new StopWatch(); clock.start(); result = jp.proceed(); clock.stop(); long executeTime = clock.getTime(); LoggerUtil.info(targetName, methodName, "调用Controller方法返回结果", result, executeTime, args); } catch (Exception exception) { LoggerUtil.error(targetName, methodName, "统一异常处理", exception, args); ResultVo resultVo = new ResultVo(false); // 为安全起见,只有业务异常我们对前端可见,否则统一归为系统异常 if (exception instanceof BusinessException) { resultVo.setResultAndCode(false, ((BusinessException) exception).getErrorCode(), ((BusinessException) exception).getErrorMessage()); } else { resultVo.setResultAndCode(false, ErrorCode.DEALER_ERR_100000.getCode(), "系统异常,请联系管理员"); } result = resultVo; } return result; } }
系统本来的统一异常处理是通过实现HandlerExceptionResolver接口自定义异常处理,实现这个aop后发现,在这里也可以实现系统异常统一处理,于是就把自定义异常处理给干掉了。一举两得。