【JavaWeb下】SLF4J+LogBack使用配置
关于SLF4j和LogBack的相关说明请自行百度
由于换工作原因，现在公司项目是普通JavaWeb项目（JSP那种）,而且日志系统是公司自己写的，每次遇到问题，都不能抛出详细的报错信息，导致修改线上问题的时候会费很多时间（可能对于新到公司来说吧，老手还好），无奈只能自己在本地先测试咯，使用了之前的日志框架
SLF4j+LofBack来重写日志输出~~~最后感觉还可以，直接开始~
需要的Jar包
由于没有用到Maven,所有的Jar包都需自己下载（莫法~），还好只用到了以下3个Jar包…
- logback-classic-1.2.3.jar
- logback-core-1.2.3.jar
- slf4j-api-1.7.9.jar
下载之后放到
WEB-INF/lib目录下,如下图所示
logback.xml配置文件
这个文件主要是用来配置日志输出及相关策略的，我这里呢根据自己的需要大部分已经配置好了，各位如果觉得有需要改进的地方可以给我说哟~
logback.xml配置文件放到classpath路径下
<configuration scan="false" scanPeriod="60 seconds" debug="false">
<property name="logDir" value="D:/logs" />
<property name="maxFileSize" value="10KB" />
<property name="maxHistory" value="30" />
<property name="log.pattern" value="%d{yyyy-MM-dd : HH:mm:ss.SSS}[%thread]%-5level%logger{50}-%msg%n"/>
<property name="projectName" value="YxWeChat" />
<appender name="DEBUG" class="ch.qos.logback.core.rolling.RollingFileAppender">
<encoder>
<pattern>${log.pattern}pattern>
encoder>
<filter class="ch.qos.logback.classic.filter.LevelFilter">
<level>DEBUGlevel>
<onMatch>ACCEPTonMatch>
<onMismatch>DENYonMismatch>
filter>
<file>${logDir}/${projectName}/${projectName}-debug.logfile>
<rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
<fileNamePattern>/${logDir}/${projectName}/debug/%d{yyyy-MM-dd}/${projectName}-debug-%d{yyyy-MM-dd}.%i.logfileNamePattern>
<maxHistory>${maxHistory}maxHistory>
<timeBasedFileNamingAndTriggeringPolicy class="ch.qos.logback.core.rolling.SizeAndTimeBasedFNATP">
<maxFileSize>${maxFileSize}maxFileSize>
timeBasedFileNamingAndTriggeringPolicy>
rollingPolicy>
appender>
<appender name="INFO" class="ch.qos.logback.core.rolling.RollingFileAppender">
<encoder charset="utf-8">
<pattern>${log.pattern}pattern>
encoder>
<filter class="ch.qos.logback.classic.filter.LevelFilter">
<level>INFOlevel>
<onMatch>ACCEPTonMatch>
<onMismatch>DENYonMismatch>
filter>
<file>${logDir}/${projectName}/${projectName}-info.logfile>
<rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
<fileNamePattern>/${logDir}/${projectName}/info/%d{yyyy-MM-dd}/${projectName}-info-%d{yyyy-MM-dd}.%i.logfileNamePattern>
<maxHistory>${maxHistory}maxHistory>
<timeBasedFileNamingAndTriggeringPolicy class="ch.qos.logback.core.rolling.SizeAndTimeBasedFNATP">
<maxFileSize>${maxFileSize}maxFileSize>
timeBasedFileNamingAndTriggeringPolicy>
rollingPolicy>
appender>
<appender name="WARN" class="ch.qos.logback.core.rolling.RollingFileAppender">
<encoder charset="utf-8">
<pattern>${log.pattern}pattern>
encoder>
<filter class="ch.qos.logback.classic.filter.LevelFilter">
<level>WARNlevel>
<onMatch>ACCEPTonMatch>
<onMismatch>DENYonMismatch>
filter>
<file>${logDir}/${projectName}/${projectName}-warn.logfile>
<rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
<fileNamePattern>/${logDir}/${projectName}/warn/%d{yyyy-MM-dd}/${projectName}-warn-%d{yyyy-MM-dd}.%i.logfileNamePattern>
<maxHistory>${maxHistory}maxHistory>
<timeBasedFileNamingAndTriggeringPolicy
class="ch.qos.logback.core.rolling.SizeAndTimeBasedFNATP">
<maxFileSize>${maxFileSize}maxFileSize>
timeBasedFileNamingAndTriggeringPolicy>
rollingPolicy>
appender>
<appender name="ERROR" class="ch.qos.logback.core.rolling.RollingFileAppender">
<encoder charset="utf-8">
<pattern>${log.pattern}pattern>
encoder>
<filter class="ch.qos.logback.classic.filter.LevelFilter">
<level>ERRORlevel>
<onMatch>ACCEPTonMatch>
<onMismatch>DENYonMismatch>
filter>
<file>${logDir}/${projectName}/${projectName}-error.logfile>
<rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
<fileNamePattern>/${logDir}/${projectName}/error/%d{yyyy-MM-dd}/${projectName}-error-%d{yyyy-MM-dd}.%i.logfileNamePattern>
<maxHistory>${maxHistory}maxHistory>
<timeBasedFileNamingAndTriggeringPolicy
class="ch.qos.logback.core.rolling.SizeAndTimeBasedFNATP">
<maxFileSize>${maxFileSize}maxFileSize>
timeBasedFileNamingAndTriggeringPolicy>
rollingPolicy>
appender>
<root level="DEBUG">
<appender-ref ref="DEBUG" />
<appender-ref ref="INFO" />
<appender-ref ref="ERROR" />
<appender-ref ref="WARN" />
root>
configuration>
此配置文件的效果为：按天生成日志文件，每个日志文件的大小为
10KB（可通过设置maxFileSize属性来改变单个日志文件大小），日志文件按天存放，最大保留30天（可通过设置maxHistory属性来设置保存时长）
Java代码测试
创建
test.java
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public class test{
private static Logger log = LoggerFactory.getLogger(test.class);
public void LogTest() {
log.info("Info查詢医院科室");
log.debug("Debug查詢医院科室");
log.warn("Warn查询医院科室");
String a = null;
try {
if(a.length()==1) {
System.out.println("1");
}
} catch (Exception e) {
log.error("查询医院科室出错:{}",e.getMessage(),e);
}
}
}
输出结果
进入上述方法之后，会在我们定义的日志目录中输出
*-debug.log,*-error.log,*-info.log,*-warn.log的日志文件（如图①所示）
当我们的单个日志文件超过10KB,会自动生成日志文件夹，并按照我们定义的格式分段保存当天日志（如图②③所示）
有些同学可能会问，我们不是设置的日志格式大小为10KB么？为什么会出现14KB,11KB的情况？
我们打开图③的YxWeChat-error-2019-08-06.0.log看看
2019-08-06 : 17:51:19.188[default task-8]ERRORYxWeChat.Actions.KSJS.KSJS-查询医院科室出错:null
java.lang.NullPointerException: null
at YxWeChat.Actions.KSJS.KSJS.QueryKS(KSJS.java:49)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at SOA.YxProGlob.Busy.TBusy.Execute(TBusy.java:23)
at YxESB.bus.TEsbBus.doEsb(TEsbBus.java:64)
at YxESB.http.noCheckAction.doPost(noCheckAction.java:62)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:707)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:790)
at io.undertow.servlet.handlers.ServletHandler.handleRequest(ServletHandler.java:86)
at io.undertow.servlet.handlers.security.ServletSecurityRoleHandler.handleRequest(ServletSecurityRoleHandler.java:62)
at io.undertow.servlet.handlers.ServletDispatchingHandler.handleRequest(ServletDispatchingHandler.java:36)
at org.wildfly.extension.undertow.security.SecurityContextAssociationHandler.handleRequest(SecurityContextAssociationHandler.java:78)
at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)
at io.undertow.servlet.handlers.security.SSLInformationAssociationHandler.handleRequest(SSLInformationAssociationHandler.java:131)
at io.undertow.servlet.handlers.security.ServletAuthenticationCallHandler.handleRequest(ServletAuthenticationCallHandler.java:57)
at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)
at io.undertow.security.handlers.AbstractConfidentialityHandler.handleRequest(AbstractConfidentialityHandler.java:46)
at io.undertow.servlet.handlers.security.ServletConfidentialityConstraintHandler.handleRequest(ServletConfidentialityConstraintHandler.java:64)
at io.undertow.security.handlers.AuthenticationMechanismsHandler.handleRequest(AuthenticationMechanismsHandler.java:58)
at io.undertow.servlet.handlers.security.CachedAuthenticatedSessionHandler.handleRequest(CachedAuthenticatedSessionHandler.java:70)
at io.undertow.security.handlers.SecurityInitialHandler.handleRequest(SecurityInitialHandler.java:76)
at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)
at org.wildfly.extension.undertow.security.jacc.JACCContextIdHandler.handleRequest(JACCContextIdHandler.java:61)
at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)
at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)
at io.undertow.servlet.handlers.ServletInitialHandler.handleFirstRequest(ServletInitialHandler.java:261)
at io.undertow.servlet.handlers.ServletInitialHandler.dispatchRequest(ServletInitialHandler.java:248)
at io.undertow.servlet.handlers.ServletInitialHandler.access$000(ServletInitialHandler.java:77)
at io.undertow.servlet.handlers.ServletInitialHandler$1.handleRequest(ServletInitialHandler.java:167)
at io.undertow.server.Connectors.executeRootHandler(Connectors.java:199)
at io.undertow.server.HttpServerExchange$1.run(HttpServerExchange.java:761)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748)
2019-08-06 : 17:51:55.799[default task-15]ERRORYxWeChat.Actions.KSJS.KSJS-查询医院科室出错:null
java.lang.NullPointerException: null
at YxWeChat.Actions.KSJS.KSJS.QueryKS(KSJS.java:49)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at SOA.YxProGlob.Busy.TBusy.Execute(TBusy.java:23)
at YxESB.bus.TEsbBus.doEsb(TEsbBus.java:64)
at YxESB.http.noCheckAction.doPost(noCheckAction.java:62)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:707)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:790)
at io.undertow.servlet.handlers.ServletHandler.handleRequest(ServletHandler.java:86)
at io.undertow.servlet.handlers.security.ServletSecurityRoleHandler.handleRequest(ServletSecurityRoleHandler.java:62)
at io.undertow.servlet.handlers.ServletDispatchingHandler.handleRequest(ServletDispatchingHandler.java:36)
at org.wildfly.extension.undertow.security.SecurityContextAssociationHandler.handleRequest(SecurityContextAssociationHandler.java:78)
at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)
at io.undertow.servlet.handlers.security.SSLInformationAssociationHandler.handleRequest(SSLInformationAssociationHandler.java:131)
at io.undertow.servlet.handlers.security.ServletAuthenticationCallHandler.handleRequest(ServletAuthenticationCallHandler.java:57)
at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)
at io.undertow.security.handlers.AbstractConfidentialityHandler.handleRequest(AbstractConfidentialityHandler.java:46)
at io.undertow.servlet.handlers.security.ServletConfidentialityConstraintHandler.handleRequest(ServletConfidentialityConstraintHandler.java:64)
at io.undertow.security.handlers.AuthenticationMechanismsHandler.handleRequest(AuthenticationMechanismsHandler.java:58)
at io.undertow.servlet.handlers.security.CachedAuthenticatedSessionHandler.handleRequest(CachedAuthenticatedSessionHandler.java:70)
at io.undertow.security.handlers.SecurityInitialHandler.handleRequest(SecurityInitialHandler.java:76)
at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)
at org.wildfly.extension.undertow.security.jacc.JACCContextIdHandler.handleRequest(JACCContextIdHandler.java:61)
at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)
at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)
at io.undertow.servlet.handlers.ServletInitialHandler.handleFirstRequest(ServletInitialHandler.java:261)
at io.undertow.servlet.handlers.ServletInitialHandler.dispatchRequest(ServletInitialHandler.java:248)
at io.undertow.servlet.handlers.ServletInitialHandler.access$000(ServletInitialHandler.java:77)
at io.undertow.servlet.handlers.ServletInitialHandler$1.handleRequest(ServletInitialHandler.java:167)
at io.undertow.server.Connectors.executeRootHandler(Connectors.java:199)
at io.undertow.server.HttpServerExchange$1.run(HttpServerExchange.java:761)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748)
2019-08-06 : 17:51:55.946[default task-19]ERRORYxWeChat.Actions.KSJS.KSJS-查询医院科室出错:null
java.lang.NullPointerException: null
at YxWeChat.Actions.KSJS.KSJS.QueryKS(KSJS.java:49)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at SOA.YxProGlob.Busy.TBusy.Execute(TBusy.java:23)
at YxESB.bus.TEsbBus.doEsb(TEsbBus.java:64)
at YxESB.http.noCheckAction.doPost(noCheckAction.java:62)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:707)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:790)
at io.undertow.servlet.handlers.ServletHandler.handleRequest(ServletHandler.java:86)
at io.undertow.servlet.handlers.security.ServletSecurityRoleHandler.handleRequest(ServletSecurityRoleHandler.java:62)
at io.undertow.servlet.handlers.ServletDispatchingHandler.handleRequest(ServletDispatchingHandler.java:36)
at org.wildfly.extension.undertow.security.SecurityContextAssociationHandler.handleRequest(SecurityContextAssociationHandler.java:78)
at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)
at io.undertow.servlet.handlers.security.SSLInformationAssociationHandler.handleRequest(SSLInformationAssociationHandler.java:131)
at io.undertow.servlet.handlers.security.ServletAuthenticationCallHandler.handleRequest(ServletAuthenticationCallHandler.java:57)
at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)
at io.undertow.security.handlers.AbstractConfidentialityHandler.handleRequest(AbstractConfidentialityHandler.java:46)
at io.undertow.servlet.handlers.security.ServletConfidentialityConstraintHandler.handleRequest(ServletConfidentialityConstraintHandler.java:64)
at io.undertow.security.handlers.AuthenticationMechanismsHandler.handleRequest(AuthenticationMechanismsHandler.java:58)
at io.undertow.servlet.handlers.security.CachedAuthenticatedSessionHandler.handleRequest(CachedAuthenticatedSessionHandler.java:70)
at io.undertow.security.handlers.SecurityInitialHandler.handleRequest(SecurityInitialHandler.java:76)
at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)
at org.wildfly.extension.undertow.security.jacc.JACCContextIdHandler.handleRequest(JACCContextIdHandler.java:61)
at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)
at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)
at io.undertow.servlet.handlers.ServletInitialHandler.handleFirstRequest(ServletInitialHandler.java:261)
at io.undertow.servlet.handlers.ServletInitialHandler.dispatchRequest(ServletInitialHandler.java:248)
at io.undertow.servlet.handlers.ServletInitialHandler.access$000(ServletInitialHandler.java:77)
at io.undertow.servlet.handlers.ServletInitialHandler$1.handleRequest(ServletInitialHandler.java:167)
at io.undertow.server.Connectors.executeRootHandler(Connectors.java:199)
at io.undertow.server.HttpServerExchange$1.run(HttpServerExchange.java:761)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748)
2019-08-06 : 17:51:56.521[default task-26]ERRORYxWeChat.Actions.KSJS.KSJS-查询医院科室出错:null
java.lang.NullPointerException: null
at YxWeChat.Actions.KSJS.KSJS.QueryKS(KSJS.java:49)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at SOA.YxProGlob.Busy.TBusy.Execute(TBusy.java:23)
at YxESB.bus.TEsbBus.doEsb(TEsbBus.java:64)
at YxESB.http.noCheckAction.doPost(noCheckAction.java:62)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:707)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:790)
at io.undertow.servlet.handlers.ServletHandler.handleRequest(ServletHandler.java:86)
at io.undertow.servlet.handlers.security.ServletSecurityRoleHandler.handleRequest(ServletSecurityRoleHandler.java:62)
at io.undertow.servlet.handlers.ServletDispatchingHandler.handleRequest(ServletDispatchingHandler.java:36)
at org.wildfly.extension.undertow.security.SecurityContextAssociationHandler.handleRequest(SecurityContextAssociationHandler.java:78)
at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)
at io.undertow.servlet.handlers.security.SSLInformationAssociationHandler.handleRequest(SSLInformationAssociationHandler.java:131)
at io.undertow.servlet.handlers.security.ServletAuthenticationCallHandler.handleRequest(ServletAuthenticationCallHandler.java:57)
at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)
at io.undertow.security.handlers.AbstractConfidentialityHandler.handleRequest(AbstractConfidentialityHandler.java:46)
at io.undertow.servlet.handlers.security.ServletConfidentialityConstraintHandler.handleRequest(ServletConfidentialityConstraintHandler.java:64)
at io.undertow.security.handlers.AuthenticationMechanismsHandler.handleRequest(AuthenticationMechanismsHandler.java:58)
at io.undertow.servlet.handlers.security.CachedAuthenticatedSessionHandler.handleRequest(CachedAuthenticatedSessionHandler.java:70)
at io.undertow.security.handlers.SecurityInitialHandler.handleRequest(SecurityInitialHandler.java:76)
at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)
at org.wildfly.extension.undertow.security.jacc.JACCContextIdHandler.handleRequest(JACCContextIdHandler.java:61)
at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)
at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)
at io.undertow.servlet.handlers.ServletInitialHandler.handleFirstRequest(ServletInitialHandler.java:261)
at io.undertow.servlet.handlers.ServletInitialHandler.dispatchRequest(ServletInitialHandler.java:248)
at io.undertow.servlet.handlers.ServletInitialHandler.access$000(ServletInitialHandler.java:77)
at io.undertow.servlet.handlers.ServletInitialHandler$1.handleRequest(ServletInitialHandler.java:167)
at io.undertow.server.Connectors.executeRootHandler(Connectors.java:199)
at io.undertow.server.HttpServerExchange$1.run(HttpServerExchange.java:761)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748)
可以看到我们的错误日志报错是完整的报错信息，那我们是不是可以认为超出我们定义的日志大小，是因为logback为我们做了
优化呢？哈哈，反正不管怎样都在我们接受范围内、好了，关于slf4j+logback的使用基本就这样啦。
如果有什么问题或者建议，请在评论区留言哦，谢谢