logback 的日志文件，不包含 e.printStackTrace()

1、描述

使用spring boot 记录多个项目的日志，日志太多，配置了logback ,但是只记录了日志，不输出堆栈的信息，不好排查问题。

2、配置logback

Maven配置

spring boot默认的日志框架是 log4j ,所以要保证这个日志能用需要去掉项目中所有的common-log

例如

<dependency>
            <groupId>commons-lang</groupId>
            <artifactId>commons-lang</artifactId>
            <version>2.6</version>
            <exclusions>
                <exclusion>
                    <groupId>commons-logging</groupId>
                    <artifactId>commons-logging</artifactId>
                </exclusion>
            </exclusions>
        </dependency>

配置logback

<?xml version="1.0" encoding="UTF-8"?>
<!-- 说明： 1. 文件的命名和加载顺序有关 logback.xml早于application.yml加载，logback-spring.xml晚于application.yml加载
	如果logback配置需要使用application.yml中的属性，需要命名为logback-spring.xml 2. logback使用application.yml中的属性
	使用springProperty才可使用application.yml中的值 可以设置默认值 -->
<configuration scan="true" scanPeriod="30 seconds">

    <!-- 定义日志的根目录 -->
    <property name="LOG_HOME" value="logs" />
    <!-- 定义日志文件名称 -->
    <property name="appName" value="hn-info"/>
    <property name="py2java" value="py2java"/>
    <property name="tax" value="tax"/>

    <!-- 控制台输出 -->
    <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
        <encoder>
            <pattern>%d{HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg%n%ex
            </pattern>
        </encoder>
    </appender>
    <!-- 日志文件输出 -->
    <appender name="FILE" class="ch.qos.logback.core.rolling.RollingFileAppender">
        <rollingPolicy class="ch.qos.logback.core.rolling.SizeAndTimeBasedRollingPolicy">
            <fileNamePattern>${LOG_HOME}/${appName}-%d{yyyy-MM-dd}-%i.log
            </fileNamePattern>
            <maxFileSize>20MB</maxFileSize>
            <maxHistory>30</maxHistory>
            <totalSizeCap>3GB</totalSizeCap>
        </rollingPolicy>
        <encoder class="ch.qos.logback.classic.encoder.PatternLayoutEncoder">
            <pattern>%d{yyyy-MM-dd HH:mm:ss.SSS} %-4relative [%thread] %-5level %logger{35} - %msg%n%ex
            </pattern>
        </encoder>
    </appender>
    <!-- 日志文件输出 -->
    <appender name="PYFILE" class="ch.qos.logback.core.rolling.RollingFileAppender">
        <rollingPolicy class="ch.qos.logback.core.rolling.SizeAndTimeBasedRollingPolicy">
            <fileNamePattern>${LOG_HOME}/${py2java}-%d{yyyy-MM-dd}-%i.log
            </fileNamePattern>
            <maxFileSize>20MB</maxFileSize>
            <maxHistory>30</maxHistory>
            <totalSizeCap>3GB</totalSizeCap>
        </rollingPolicy>
        <encoder class="ch.qos.logback.classic.encoder.PatternLayoutEncoder">
            <pattern>%d{yyyy-MM-dd HH:mm:ss.SSS} %-4relative [%thread] %-5level %logger{35} - %msg%n%ex
            </pattern>
        </encoder>
    </appender>

    <appender name="TAXFILE" class="ch.qos.logback.core.rolling.RollingFileAppender">
        <rollingPolicy class="ch.qos.logback.core.rolling.SizeAndTimeBasedRollingPolicy">
            <fileNamePattern>${LOG_HOME}/${tax}-%d{yyyy-MM-dd}-%i.log
            </fileNamePattern>
            <maxFileSize>20MB</maxFileSize>
            <maxHistory>30</maxHistory>
            <totalSizeCap>3GB</totalSizeCap>
        </rollingPolicy>
        <encoder class="ch.qos.logback.classic.encoder.PatternLayoutEncoder">
            <pattern>%d{yyyy-MM-dd HH:mm:ss.SSS} %-4relative [%thread] %-5level %logger{35} - %msg%n%ex
            </pattern>
        </encoder>
    </appender>
    <!-- ************************LOGGER开始****************************** -->
    <!-- 全局日志记录器 -->
    <!-- 级别依次为【从高到低】：FATAL > ERROR > WARN > INFO > DEBUG > TRACE -->
    <root level="INFO">
        <appender-ref ref="STDOUT" />
    </root>

    <!-- 指定项目中某个包，当有日志操作行为时的日志记录级别 -->
    <!-- 级别依次为【从高到低】：FATAL > ERROR > WARN > INFO > DEBUG > TRACE -->
    <!-- additivity=false 表示匹配之后，不再继续传递给其他的logger -->
    <logger name="cn.com.at.hb.py2java" level="DEBUG" additivity="false">
        <appender-ref ref="PYFILE" />
        <appender-ref ref="STDOUT" />
    </logger>
    <logger name="cn.com.at.hb.hninformation" level="DEBUG" additivity="false">
        <appender-ref ref="FILE" />
        <appender-ref ref="STDOUT" />
    </logger>
    <logger name="com.at21.hnbdc" level="DEBUG" additivity="false">
        <appender-ref ref="TAXFILE" />
        <appender-ref ref="STDOUT" />
    </logger>
</configuration>

3、日志输出

获取堆栈的日志输出为字符串

public class ExceptionUtils {

    public static void main(String[] args) {
        try {
            String a = "";
        } catch (Exception e) {
            ExceptionUtils.error(Logger, "", e);
        }
    }
    public static void error(Logger log, String message, Exception e) {
        log.error(e.getMessage());
        log.error(message, e);
        e.printStackTrace();
        getMessage(e);
    }

    public static String getMessage(Exception e) {
        try(StringWriter sw = new StringWriter();
            PrintWriter pw = new PrintWriter(sw);
        ) {
            // 将出错的栈信息输出到printWriter中
            e.printStackTrace(pw);
            pw.flush();
            sw.flush();
            return sw.toString();
        } catch (Exception ex) {
            throw new RuntimeException(ex);
        }
    }
}