JDK提供的日志使用记录

来源：互联网发布：打印机驱动软件下载编辑：程序博客网时间：2024/06/07 08:08

测试一下JDK提供的日志。

1 日志属性配置文件缺省日志配置文件：

D:\Program Files (x86)\Java\jdk1.7.0_05\jre\lib\logging.properties

2 配置文件中特殊字符说明

       •"/" 本地路径名分隔符
       •"%t" 系统临时目录
       •"%h" "user.home" 系统属性的值 (win系统会在c:/users/username目录下)
       •"%g" 区分循环日志的生成号
       •"%u" 解决冲突的惟一号码
       •"%%" 转换为单个百分数符号"%"

3 日志配置文件在源代码中说明 java.util.logging.LogManager.java

       String fname = System.getProperty("java.util.logging.config.file");
        if (fname == null) {
            fname = System.getProperty("java.home");
            if (fname == null) {
                throw new Error("Can't find java.home ??");
            }
            File f = new File(fname, "lib");
            f = new File(f, "logging.properties");
            fname = f.getCanonicalPath();
        }
        InputStream in = new FileInputStream(fname);
        BufferedInputStream bin = new BufferedInputStream(in);
        try {
            readConfiguration(bin);

4 日志配置内容示例

# 输出到文件与控制台
handlers= java.util.logging.FileHandler, java.util.logging.ConsoleHandler
.level=

# java.util.logging.FileHandler.pattern = %h/java%u.log
java.util.logging.FileHandler.pattern = LOG.log
java.util.logging.FileHandler.limit = 50000
java.util.logging.FileHandler.count = 1
java.util.logging.FileHandler.formatter = java.util.logging.XMLFormatter

# Limit the message that are printed on the console to INFO and above.
java.util.logging.ConsoleHandler.level = INFO
java.util.logging.ConsoleHandler.formatter = java.util.logging.SimpleFormatter

java.util.logging.SimpleFormatter.format=%4$s: %5$s [%1$tc]%n

cuigh.log.jdk17 = SERVER

5 JAVA示例代码

package cuigh.log.jdk17;

import java.io.File;
import java.io.IOException;
import java.util.logging.Level;
import java.util.logging.Logger;

public class Jdk17Log {

   /**
   * 功能：演示JDK提供的日志
   * 说明：1 日志属性配置文件缺省日志配置文件：D:\Program Files (x86)\Java\jdk1.7.0_05\jre\lib\logging.properties
   *     2 配置文件中特殊字符说明
   * •"/" 本地路径名分隔符
       •"%t" 系统临时目录
       •"%h" "user.home" 系统属性的值 (win系统会在c:/users/username目录下)
       •"%g" 区分循环日志的生成号
       •"%u" 解决冲突的惟一号码
       •"%%" 转换为单个百分数符号"%"
          3 日志配置文件在源代码中说明   java.util.logging.LogManager.java

       String fname = System.getProperty("java.util.logging.config.file");
        if (fname == null) {
            fname = System.getProperty("java.home");
            if (fname == null) {
                throw new Error("Can't find java.home ??");
            }
            File f = new File(fname, "lib");
            f = new File(f, "logging.properties");
            fname = f.getCanonicalPath();
        }
        InputStream in = new FileInputStream(fname);
        BufferedInputStream bin = new BufferedInputStream(in);
        try {
            readConfiguration(bin);
       4 日志配置内容示例

   */
   public static void main(String[] args) throws SecurityException, IOException {
       // TODO Auto-generated method stub

       Logger log = Logger.getLogger("Jdk17Log");
         log.setLevel(Level.FINE);

         Logger log1 = Logger.getLogger("Jdk17Log");
         log.setLevel(Level.FINEST);
         System.out.println(log==log1);     //true

         Logger log2 = Logger.getLogger("Jdk17Log.blog");
         log2.setLevel(Level.WARNING);

         log.info("aaa");
         log1.info("bbb");
         log2.info("fine");

         String fname = System.getProperty("java.util.logging.config.file");
         fname = System.getProperty("java.home");
         File f = new File(fname, "lib");
         f = new File(f, "logging.properties");
         fname = f.getCanonicalPath();
         System.out.println("java.util.logging.config.file = " + fname);

   }

}

0 0