Java log4j2在spring引导应用程序中不工作

我试图在spring应用程序中使用log4j2而不是logback，但它总是抛出错误。 pom文件看起来像

<parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>1.5.7.RELEASE</version>
    <relativePath /> 
</parent>

<dependencies>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter</artifactId>
        <exclusions>
            <exclusion>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-logging</artifactId>
            </exclusion>
        </exclusions>
    </dependency>

    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
    </dependency>

    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-log4j2</artifactId>
    </dependency>
</dependencies>

<?xml version="1.0" encoding="UTF-8"?>
<Configuration monitorInterval="60">
    <Properties>
        <Property name="path">logs</Property>
    </Properties>
    <Appenders>
        <Console name="Console-Appender" target="SYSTEM_OUT">
            <PatternLayout>
                <pattern>
                    [%-5level] %d{yyyy-MM-dd HH:mm:ss.SSS} [%t] %c{1} - %msg%n
                </pattern>>
            </PatternLayout>
        </Console>
        <File name="App-Appender" fileName="${path}/app_log.log" >
            <PatternLayout>
                <pattern>
                    [%-5level] %d{yyyy-MM-dd HH:mm:ss.SSS} [%t] %c{1} - %msg%n
                </pattern>
            </PatternLayout>
        </File>
        <File name="SpringBoot-Appender" fileName="${path}/springboot_log.log" >
            <PatternLayout>
                <pattern>
                    [%-5level] %d{yyyy-MM-dd HH:mm:ss.SSS} [%t] %c{1} - %msg%n
                </pattern>
            </PatternLayout>
        </File>
    </Appenders>
    <Loggers>
        <Logger name="master.dt" level="info" additivity="false">
            <AppenderRef ref="SpringBoot-Appender"/>
            <AppenderRef ref="Console-Appender"/>
        </Logger>
        <Logger name="master.dt" level="info" additivity="false">
            <AppenderRef ref="App-Appender"/>
            <AppenderRef ref="Console-Appender"/>
         </Logger>
        <Root>
            <AppenderRef ref="Console-Appender"/>
        </Root>
    </Loggers>
</Configuration>

---

我关注了多个博客，但没有一个是有效的。让log4j2工作的正确方法是什么？

您与slf4j存在jar冲突。查看依赖关系树，找出要排除的jar。

也从spring boot starter web依赖关系中排除默认的spring boot starter日志依赖关系

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-web</artifactId>
      <exclusions>
        <exclusion>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-logging</artifactId>
        </exclusion>
    </exclusions>
</dependency>

org.springframework.boot
SpringBootStarterWeb
org.springframework.boot
spring启动程序日志记录

我在基于微服务的项目中遇到了这个问题，该项目基于许多服务。由于log4j、slf4j、apache公共日志等之间存在大量冲突，因此日志文件甚至没有创建足够的特权。 首先运行命令以解决依赖关系树中的jar冲突

**mvn dependency:tree**
Exclude those jars from spring-boot starter dependencies and other component dependencies.

Following Code is perfectly working for me after lot of struggle.

<dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
            <exclusions>
                <exclusion>
                    <groupId>org.springframework.boot</groupId>
                    <artifactId>spring-boot-starter-logging</artifactId>
                </exclusion>
            </exclusions>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-log4j2</artifactId>
        </dependency>

**mvn依赖项：树**
从spring启动程序依赖项和其他组件依赖项中排除这些JAR。
经过很多努力，下面的代码对我来说非常有效。
org.springframework.boot
SpringBootStarterWeb
org.springframework.boot
spring启动程序日志记录
org.springframework.boot
spring-boot-starter-log4j2

****Log4j.xml文件：****

        <?xml version="1.0" encoding="UTF-8"?>
        <Configuration>
            <Appenders>
                <Console name="Console" target="SYSTEM_OUT">
                    <PatternLayout
                        pattern="%style{%d{ISO8601}}{black} %highlight{%-5level }[%style{%t}{bright,blue}] %style{%C{1.}}{bright,yellow}: %msg%n%throwable" />
                </Console>

                <RollingFile name="RollingFile"
                    fileName="./logs/gateway-log4j2.log"
                    filePattern="./logs/$${date:yyyy-MM}/spring-boot-logger-log4j2-%d{-dd-MMMM-yyyy}-%i.log.gz">
                    <PatternLayout>
                        <pattern>%d %p %C{1.} [%t] %m%n</pattern>
                    </PatternLayout>
                    <Policies>
                        <!-- rollover on startup, daily and when the file reaches 
                            10 MegaBytes -->
                        <OnStartupTriggeringPolicy />
                        <SizeBasedTriggeringPolicy
                            size="10 MB" />
                        <TimeBasedTriggeringPolicy />
                    </Policies>
                </RollingFile>
            </Appenders>

            <Loggers>
                <!-- LOG everything at INFO level -->
                <Root level="info">
                    <AppenderRef ref="Console" />
                    <AppenderRef ref="RollingFile" />
                </Root>

                <!-- LOG "com.mytest.project*" at TRACE level -->
                <Logger name="com.mytest.project" level="trace"></Logger>
            </Loggers>

        </Configuration>

        Try it. It perfectly working for me.

%d%p%C{1.}[%t]%m%n
试试看。这对我来说非常有效。

        <?xml version="1.0" encoding="UTF-8"?>
        <Configuration>
            <Appenders>
                <Console name="Console" target="SYSTEM_OUT">
                    <PatternLayout
                        pattern="%style{%d{ISO8601}}{black} %highlight{%-5level }[%style{%t}{bright,blue}] %style{%C{1.}}{bright,yellow}: %msg%n%throwable" />
                </Console>

                <RollingFile name="RollingFile"
                    fileName="./logs/gateway-log4j2.log"
                    filePattern="./logs/$${date:yyyy-MM}/spring-boot-logger-log4j2-%d{-dd-MMMM-yyyy}-%i.log.gz">
                    <PatternLayout>
                        <pattern>%d %p %C{1.} [%t] %m%n</pattern>
                    </PatternLayout>
                    <Policies>
                        <!-- rollover on startup, daily and when the file reaches 
                            10 MegaBytes -->
                        <OnStartupTriggeringPolicy />
                        <SizeBasedTriggeringPolicy
                            size="10 MB" />
                        <TimeBasedTriggeringPolicy />
                    </Policies>
                </RollingFile>
            </Appenders>

            <Loggers>
                <!-- LOG everything at INFO level -->
                <Root level="info">
                    <AppenderRef ref="Console" />
                    <AppenderRef ref="RollingFile" />
                </Root>

                <!-- LOG "com.mytest.project*" at TRACE level -->
                <Logger name="com.mytest.project" level="trace"></Logger>
            </Loggers>

        </Configuration>

        Try it. It perfectly working for me.