在android中使用logback-android日誌框架配置 slf4j + logback

爲何使用 slf4j + logback

　　logbak定位於log4j的替代者，logback一樣支持slf4j，方便被替換。在Android平臺上，我在使用log4中遇到tag混亂的問題。相比log4j，logback-android的jar更小巧。

下載jar包

　　前往 https://github.com/tony19/logback-android ，下載得到 logback-android-1.1.1-4.jar  slf4j-api-1.7.6.jar

導入到工程中

　　將上面的兩個jar文件放入項目中的libs中，並添加項目引用。

配置日誌文件的位置

　　注意下面代碼中的  configureLogbackDirectly 方法，它接收一個文件路徑參數,指示存放日誌文件的目錄，還有一個是生成的日誌文件的前綴。我下面配置了「天天生成一個新的日誌文件」。

　　

package vir56k.logdemo;

import android.os.Environment;
import org.slf4j.LoggerFactory;
import java.io.File;
import ch.qos.logback.classic.Level;
import ch.qos.logback.classic.Logger;
import ch.qos.logback.classic.LoggerContext;
import ch.qos.logback.classic.android.LogcatAppender;
import ch.qos.logback.classic.encoder.PatternLayoutEncoder;
import ch.qos.logback.classic.spi.ILoggingEvent;
import ch.qos.logback.core.rolling.RollingFileAppender;
import ch.qos.logback.core.rolling.TimeBasedRollingPolicy;

/**
 * Created by zhangyunfei on 15/9/21.
 */
public class LogConfigurator {
    public static void confifure() {
        final String LOG_DIR = Environment.getExternalStorageDirectory() + File.separator + "logback";
        final String PREFIX = "log";
        configureLogbackDirectly(LOG_DIR, PREFIX);
    }

    private static void configureLogbackDirectly(String log_dir, String filePrefix) {
        // reset the default context (which may already have been initialized)
        // since we want to reconfigure it
        LoggerContext context = (LoggerContext) LoggerFactory.getILoggerFactory();
        context.reset();


        RollingFileAppender<ILoggingEvent> rollingFileAppender = new RollingFileAppender<ILoggingEvent>();
        rollingFileAppender.setAppend(true);
        rollingFileAppender.setContext(context);

        // OPTIONAL: Set an active log file (separate from the rollover files).
        // If rollingPolicy.fileNamePattern already set, you don't need this.
        //rollingFileAppender.setFile(LOG_DIR + "/log.txt");

        TimeBasedRollingPolicy<ILoggingEvent> rollingPolicy = new TimeBasedRollingPolicy<ILoggingEvent>();
        rollingPolicy.setFileNamePattern(log_dir + "/" + filePrefix + "_%d{yyyyMMdd}.txt");
        rollingPolicy.setMaxHistory(7);
        rollingPolicy.setParent(rollingFileAppender);  // parent and context required!
        rollingPolicy.setContext(context);
        rollingPolicy.start();

        rollingFileAppender.setRollingPolicy(rollingPolicy);

        PatternLayoutEncoder encoder = new PatternLayoutEncoder();
        encoder.setPattern("%d{yyyy-MM-dd HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg%n");
        encoder.setContext(context);
        encoder.start();

        rollingFileAppender.setEncoder(encoder);
        rollingFileAppender.start();

        LogcatAppender logcatAppender = new LogcatAppender();
        logcatAppender.setContext(context);
        logcatAppender.setEncoder(encoder);
        logcatAppender.setName("logcat1");
        logcatAppender.start();

        // add the newly created appenders to the root logger;
        // qualify Logger to disambiguate from org.slf4j.Logger
        ch.qos.logback.classic.Logger root = (ch.qos.logback.classic.Logger) LoggerFactory.getLogger(Logger.ROOT_LOGGER_NAME);
        root.setLevel(Level.TRACE);
        root.addAppender(rollingFileAppender);
        root.addAppender(logcatAppender);

        // print any status messages (warnings, etc) encountered in logback config
        //StatusPrinter.print(context);
    }


}

 

使用方法

　　先聲明和建立實例

　　private static final Logger logger = LoggerFactory.getLogger(MainActivity.class);　
　　
　　寫入日誌　　

　　logger.debug("debug Some log message. Details: {}", "debug 輸出");
　　logger.info("info Some log message. Details: {}", "debug 輸出");
　　logger.error("error Some log message. Details: {}", "debug 輸出");

代碼混淆注意

　　請在你的混淆設置里加入下面這些：

　　-keep class ch.qos.** { *; }
　　-keep class org.slf4j.** { *; }
　　-keepattributes *Annotation*

我寫的示例下載地址

　　https://github.com/vir56k/demo/tree/master/logBackDemo

參考資料：

https://github.com/tony19/logback-android

https://github.com/tony19/logback-android/wiki/Appender-Notes

http://logback.qos.ch/documentation.html

http://blog.csdn.net/zgmzyr/article/details/8267072