无法使用 log4j 启​​用 Spring 调试日志记录

Question

这是我的 log4j.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE log4j:configuration SYSTEM "log4j.dtd">

<log4j:configuration xmlns:log4j="http://jakarta.apache.org/log4j/"  debug="true">
<appender name="FILE" class="org.apache.log4j.DailyRollingFileAppender">
    <param name="File" value="${catalina.base}/logs/server.log" />
    <param name="Append" value="true" />
    <param name="Threshold" value="INFO" />
    <param name="DatePattern" value="'.'yyyy-MM-dd" />
    <layout class="org.apache.log4j.PatternLayout">
        <param name="ConversionPattern" value="%d{ABSOLUTE}#%X{requestId}#%X{uid}#%X{agentId}#%X{agentName} %-5p [%c{1}] - %m%n" />
    </layout>
</appender>
<logger name="org.springframework" level="DEBUG">
    <appender-ref ref="FILE"/>
</logger>

我正在向控制器发出 JSON 请求并获得 400 Bad request request is syntactically incorrect。我想获得更多关于此的信息。我阅读了有关启用弹簧调试的信息并按照说明进行操作，但它不起作用。我检查了我的请求，看起来完全没问题。如何在 server.log 文件中查看有关此内容的更多信息？为什么上面的配置不起作用？ PS：为了清楚起见，我删除了其他记录器和附加器

Answer 1

这解决了它

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE log4j:configuration SYSTEM "log4j.dtd">

<log4j:configuration xmlns:log4j="http://jakarta.apache.org/log4j/" debug="false">
<!-- Rolling file Appender -->
<appender name="FILE" class="org.apache.log4j.DailyRollingFileAppender">
    <param name="File" value="${catalina.base}/logs/server.log" />
    <param name="Append" value="true" />
    <!-- changed to DEBUG-->
    <param name="Threshold" value="DEBUG" />
    <param name="DatePattern" value="'.'yyyy-MM-dd" />
    <layout class="org.apache.log4j.PatternLayout">
        <param name="ConversionPattern" value="%d{ABSOLUTE}#%X{requestId}#%X{uid}#%X{agentId}#%X{agentName} %-5p [%c{1}] - %m%n" />
    </layout>
</appender>
<!-- added this-->
<category name="org.springframework.beans">
    <priority value="debug" />
</category>

Answer 2

这里是依赖：

compile group: 'org.apache.logging.log4j', name: 'log4j-core', version: '2.1'
compile group: 'org.apache.logging.log4j', name: 'log4j-api', version: '2.1'

这里是 log4j2 配置：

以下配置适用于 windows 机器。您只能更改 linux 的日志路径。

<?xml version="1.0" encoding="UTF-8"?>
<Configuration status="warn" strict="true">
    <Properties>
        <Property name="filename">D:/CommonLogFile/YOUR_LOG_FILE_NAME.log
        </Property>
        <Property name="backupFilePattern">
            D:/CommonLogFile/PROJECT_NAME-%d{yyyy-MM-dd HH_mm}-%i.log
        </Property>
        <Property name="logPatternConsole">
            %d{yyyy-MM-dd HH:mm:ss.SSS} [%thread] %highlight{%-5level} %logger{35} - %msg%n{INFO=cyan, ERROR=red}
        </Property>
        <Property name="logPatternFile">
            %d{yyyy-MM-dd HH:mm:ss.SSS} [%thread] %-5level %logger{35} - %msg%n
        </Property>
    </Properties>

    <Appenders>
        <Console name="STDOUT" target="SYSTEM_OUT">
            <PatternLayout pattern="${logPatternConsole}"/>
        </Console>

        <RollingFile name="MyRollingFile" fileName="${filename}" filePattern="${backupFilePattern}">
            <PatternLayout pattern="${logPatternFile}"/>
            <Policies>
                <SizeBasedTriggeringPolicy size="10 MB"/>
            </Policies>
            <DefaultRolloverStrategy max="10"/>
        </RollingFile>

    </Appenders>
    <Loggers>
        <Logger name="com.project" level="trace" additivity="false">
            <AppenderRef ref="STDOUT"/>
            <AppenderRef ref="MyRollingFile"/>
        </Logger>
        <Root level="trace">
            <AppenderRef ref="STDOUT"/>
        </Root>
    </Loggers>
</Configuration>

这里包含一些重点说明：

<Property name="filename">D:/CommonLogFile/YOUR_LOG_NAME.log
        </Property>

这里，filename 是日志文件的名称。

<Property name="logPatternConsole">
            %d{yyyy-MM-dd HH:mm:ss.SSS} [%thread] %highlight{%-5level} %logger{35} - %msg%n{INFO=cyan, ERROR=red}
        </Property>

这里，logPatternConsole 有时间模式。

在 Appender 部分，它有

<Policies>
                <SizeBasedTriggeringPolicy size="10 MB"/>
            </Policies>

这里SizeBasedTriggeringPolicy 定义何时创建新的日志文件。在这里，在 10MB 之后它将创建新的 logFile

这里是日志实现：

static LogWriterUtility logWriterUtility = new LogWriterUtility(YOUR_CLASS_NAME.class);
logWriterUtility.trace(UUID.randomUUID().toString(),"Here is the log message");

查看下面的LogWriterUtility 类：

import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;

public class LogWriterUtility {

    Logger log;

    public LogWriterUtility(Class<?> clazz) {
        log = LogManager.getLogger(clazz);
    }

    public void trace(String requestId, String message) {
        log.trace("REQUESTID:" + requestId + ":" + message);
    }

    public void debug(String requestId, String message) {
        log.debug("REQUESTID:" + requestId + ":" + message);
    }

    public void error(String requestId, String message) {
        log.error("REQUESTID:" + requestId + ":" + message);
    }

    public void error(String requestId, Throwable t) {
        log.error("REQUESTID:" + requestId + ":");
        log.error(t);
    }

    public void info(String requestId, String message) {
        log.info("REQUESTID:" + requestId + ":" + message);
    }

    public void error(String requestId, Exception exception) {
        log.warn("REQUESTID:" + requestId + ":" + exception.getStackTrace());
    }
    public void errorWithAnalysis(String requestId, Exception exception) {

        if(exception==null)
            return;
        String message="No Message on error";
        StackTraceElement[] stackTrace = exception.getStackTrace();
        if(stackTrace!=null && stackTrace.length>0) {
            message="";
            for (StackTraceElement e : stackTrace) {
                message += "\n" + e.toString();
            }
        }
        log.error("REQUESTID:" + requestId + ":" +message);


    }
    public void warn(String requestId, String message) {
        log.error(requestId,message);
    }

    public boolean isTraceEnabled() {
        return log.isTraceEnabled();
    }

}

谢谢:)