JAVA高级面试进阶训练营视频教程

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由于批量更新的时候一直无法定位问题出处，就去服务器定位日志，奈何日志一直无法输出，为了能够更好的定位问题，痛定思痛后逐步排查最终解决问题。如有客官看到此处，请不要盲目对号入座，我的项目环境或许与你有区别所以解决方案不一定适合，此贴只作为工作记录，并对出现相同问题，且项目环境相同的朋友作为借鉴而已，如没有帮到，也请嘴下留情。

首先贴出日志文件：log4j2.yml

# 共有8个级别，按照从低到高为：ALL < TRACE < DEBUG < INFO < WARN < ERROR < FATAL < OFF。
Configuration:
  status: info
  monitorInterval: 30
  Properties: # 定义全局变量
    Property: # 缺省配置（用于开发环境）。其他环境需要在VM参数中指定，如下：
      - Dlog.level.console=info
      - name: log.level.console
        value: debug
      - name: log.path
        value: /data/txv1.0/tx-data/logs
      - name: project.name
        value: tx_data
      - name: log.pattern
        value: "%d{yyyy-MM-dd HH:mm:ss.SSS} -%5p ${PID:-} [%15.15t] %-30.30C{1.} : %m%n"
  Appenders:
    Console:  #输出到控制台
      name: CONSOLE
      target: SYSTEM_OUT
      PatternLayout:
        pattern: ${log.pattern}
#   启动日志
    RollingFile:
      - name: ROLLING_FILE
        fileName: ${log.path}/${project.name}.log
        filePattern: "${log.path}/historyRunLog/$${date:yyyy-MM}/${project.name}-%d{yyyy-MM-dd}-%i.log.gz"
        PatternLayout:
          pattern: ${log.pattern}
        Filters:
#        一定要先去除不接受的日志级别，然后获取需要接受的日志级别
          ThresholdFilter:
            - level: fatal
              onMatch: DENY
              onMismatch: NEUTRAL
            - level: debug
              onMatch: ACCEPT
              onMismatch: DENY
        Policies:
          TimeBasedTriggeringPolicy:  # 按天分类
            modulate: true
            interval: 1
        DefaultRolloverStrategy:     # 文件最多100个
          max: 100
#   平台日志
      - name: PLATFORM_ROLLING_FILE
        ignoreExceptions: false
        fileName: ${log.path}/platform/${project.name}_platform.log
        filePattern: "${log.path}/platform/$${date:yyyy-MM}/${project.name}-%d{yyyy-MM-dd}-%i.log.gz"
        PatternLayout:
          pattern: ${log.pattern}
        Policies:
          TimeBasedTriggeringPolicy:  # 按天分类
            modulate: true
            interval: 1
        DefaultRolloverStrategy:     # 文件最多100个
          max: 100
#   业务日志
      - name: BUSSINESS_ROLLING_FILE
        ignoreExceptions: false
        fileName: ${log.path}/bussiness/${project.name}_bussiness.log
        filePattern: "${log.path}/bussiness/$${date:yyyy-MM}/${project.name}-%d{yyyy-MM-dd}-%i.log.gz"
        PatternLayout:
          pattern: ${log.pattern}
        Policies:
          TimeBasedTriggeringPolicy:  # 按天分类
            modulate: true
            interval: 1
        DefaultRolloverStrategy:     # 文件最多100个
          max: 100
#   错误日志
      - name: EXCEPTION_ROLLING_FILE
        ignoreExceptions: false
        fileName: ${log.path}/exception/${project.name}_exception.log
        filePattern: "${log.path}/exception/$${date:yyyy-MM}/${project.name}-%d{yyyy-MM-dd}-%i.log.gz"
        ThresholdFilter:
          level: error
          onMatch: ACCEPT
          onMismatch: DENY
        PatternLayout:
          pattern: ${log.pattern}
        Policies:
          TimeBasedTriggeringPolicy:  # 按天分类
            modulate: true
            interval: 1
        DefaultRolloverStrategy:     # 文件最多100个
          max: 100
#   DB 日志
      - name: DB_ROLLING_FILE
        ignoreExceptions: false
        fileName: ${log.path}/db/${project.name}_db.log
        filePattern: "${log.path}/db/$${date:yyyy-MM}/${project.name}-%d{yyyy-MM-dd}-%i.log.gz"
        PatternLayout:
          pattern: ${log.pattern}
        Policies:
          TimeBasedTriggeringPolicy:  # 按天分类
            modulate: true
            interval: 1
        DefaultRolloverStrategy:     # 文件最多100个
          max: 100
  Loggers:
    Root:
      level: debug
      AppenderRef:
        - ref: CONSOLE
        - ref: ROLLING_FILE
        - ref: PLATFORM_ROLLING_FILE
        - ref: BUSSINESS_ROLLING_FILE
        - ref: EXCEPTION_ROLLING_FILE
        - ref: DB_ROLLING_FILE
    Logger:
      - name: rolling
        level: info
        additivity: true
        AppenderRef:
          - ref: CONSOLE
          - ref: ROLLING_FILE
      - name: platform
        level: debug
        additivity: true
        AppenderRef:
          - ref: CONSOLE
          - ref: PLATFORM_ROLLING_FILE
      - name: bussiness
        level: info
        additivity: true
        AppenderRef:
          - ref: CONSOLE
          - ref: BUSSINESS_ROLLING_FILE
      - name: exception
        level: debug
        additivity: true
        AppenderRef:
          - ref: CONSOLE
          - ref: EXCEPTION_ROLLING_FILE
      - name: db
        level: debug
        additivity: true
        AppenderRef:
          - ref: CONSOLE
          - ref: DB_ROLLING_FILE

申明：此文件格式借鉴与网上一位忘记叫什么的朋友的，如有雷同请谅解或许我就是借鉴你的。

贴出原始依赖pom文件(部分,跟日志相关的)

<dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter</artifactId>
            <exclusions>
                <!-- 排除自带的日志依赖 -->
                <exclusion>
                    <groupId>org.springframework.boot</groupId>
                    <artifactId>spring-boot-starter-logging</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
        <!-- 配置 log4j2 -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-log4j2</artifactId>
        </dependency>
        <dependency>
            <groupId>com.fasterxml.jackson.dataformat</groupId>
            <artifactId>jackson-dataformat-yaml</artifactId>
        </dependency>
    
        ..........

        <!-- 云服务依赖包 start -->
        <dependency>
            <groupId>com.qiniu</groupId>
            <artifactId>qiniu-java-sdk</artifactId>
            <version>${qiniu-version}</version>
        </dependency>
        <dependency>
            <groupId>com.aliyun.oss</groupId>
            <artifactId>aliyun-sdk-oss</artifactId>
            <version>${aliyun-oss-version}</version>
        </dependency>
        <dependency>
            <groupId>com.qcloud</groupId>
            <artifactId>cos_api</artifactId>
            <version>${qcloud-cos-version}</version>
        </dependency>
        <!-- 云服务依赖包 end -->
</dependencies>

由于启动之后再服务器中一直存在这样一种警告

SLF4J: Class path contains multiple SLF4J bindings.
SLF4J: Found binding in [jar:file:/data/txv1.0/tx-data/webapps/tx-data/WEB-INF/lib/slf4j-log4j12-1.7.25.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: Found binding in [jar:file:/data/txv1.0/tx-data/webapps/tx-data/WEB-INF/lib/log4j-slf4j-impl-2.11.2.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: See http://www.slf4j.org/codes.html#multiple_bindings for an explanation.
SLF4J: Actual binding is of type [org.slf4j.impl.Log4jLoggerFactory]

经过多次排查发现这个警告是提示slf4j-log4j12-xxx.jar 的依赖冲突

然后通过pom文件排查是否存在logger相关slf4j-log4j12-xxx.jar包的冲突，如图

上图是我去掉依赖冲突所以看不见相关依赖包，如果存在依赖的就会显示被那些jar所依赖，最终发现依赖的jar包

<dependency>
    <groupId>com.qiniu</groupId>
    <artifactId>qiniu-java-sdk</artifactId>
    <version>${qiniu-version}</version>
</dependency>

最后去掉这个包所依赖的slf4j-log4j12-xxx.jar包，就解决了如法输出日志信息的问题。

<dependency>
    <groupId>com.qcloud</groupId>
    <artifactId>cos_api</artifactId>
    <version>${qcloud-cos-version}</version>
    <exclusions>
        <exclusion>
        <groupId>org.slf4j</groupId>
        <artifactId>slf4j-log4j12</artifactId>
    </exclusion>
    </exclusions>
</dependency>