关于Log4j的使用看代码吧！注释写的很详细，苦于没有运行日志信息的代码，写那些helloworld显得不合适，写出了五种遍历List的方法，没有专门的测试工具测试他们运行的效率，哪位要是能测试一下，烦请告诉具体情况！
package org.bulktree.log4j;
import java.util.ArrayList;
import java.util.Date;
import java.util.Iterator;
import java.util.List;
import org.apache.log4j.BasicConfigurator;
import org.apache.log4j.Logger;
public class Log4jTest 
{
// 获取日志记录器
static Logger logger = Logger.getLogger(Log4jTest.class);
// static Logger logger = Logger.getLogger(Log4jTest.class.getName());
Log4jTest() {
// 配置日志环境
// 使用缺省Log4j环境
BasicConfigurator.configure();
// 读取使用Java属性文件编写的配置文件
// PropertyConfigurator.configure("log4j.properties");
// 读取XML形式的配置文件
// DOMConfigurator.configure(String filename);
}
public static void main(String[] args) {
logger.debug("Log4jTest-->>debug");
logger.info("Log4jTest-->>info");
logger.warn("Log4jTest-->>warn");
logger.error("Log4jTest-->>error");
System.out.println("************test****************");
List<String> list = new ArrayList<String>();
list.add("BULKTREE");
logger.debug("debug-->>List Success! " + "list information: " + list);
logger.info("info-->>List Success! " + "list information: " + list);
logger.warn("warn-->>List Success! " + "list information: " + list);
logger.error("error-->>List Success! " + "list information: " + list);
list.add("LAOSHULIN");
logger.debug("debug-->>List Success! " + "list information: " + list);
logger.info("info-->>List Success! " + "list information: " + list);
logger.warn("warn-->>List Success! " + "list information: " + list);
logger.error("error-->>List Success! " + "list information: " + list);
list.add("OAKERTREE");
logger.debug("debug-->>List Success! " + "list information: " + list);
logger.info("info-->>List Success! " + "list information: " + list);
logger.warn("warn-->>List Success! " + "list information: " + list);
logger.error("error-->>List Success! " + "list information: " + list);
list.add("BULKTREE.LAOSHULIN.OAKERTREE");
logger.debug("debug-->>List Success! " + "list information: " + list);
logger.info("info-->>List Success! " + "list information: " + list);
logger.warn("warn-->>List Success! " + "list information: " + list);
logger.error("error-->>List Success! " + "list information: " + list);
Log4jTest lt = new Log4jTest();
lt.firstReadList(list);
lt.secendReadList(list);
lt.threeReadList(list);
lt.fourReadList(list);
lt.fiveReadList(list);
}
public void firstReadList(List<String> list) {
for (Iterator<String> iter = list.iterator(); iter.hasNext();) {
String str = iter.next();
logger.debug("debug-->>Iterator have next element:" + str);
logger.info("info-->>Iterator have next element:" + str);
logger.warn("warn-->>Iterator have next element:" + str);
logger.error("error-->>Iterator have next element:" + str);
System.out.println("*********" + str);
}
}
public void secendReadList(List<String> list) {
for (int i = 0; i < list.size(); i++) {
String str = list.get(i);
logger.debug("debug-->>Iterator have next element:" + str);
logger.info("info-->>Iterator have next element:" + str);
logger.warn("warn-->>Iterator have next element:" + str);
logger.error("error-->>Iterator have next element:" + str);
System.out.println("========" + str);
}
}
public void threeReadList(List<String> list) {
for (String str : list) {
logger.debug("debug-->>Iterator have next element:" + str);
logger.info("info-->>Iterator have next element:" + str);
logger.warn("warn-->>Iterator have next element:" + str);
logger.error("error-->>Iterator have next element:" + str);
System.out.println("&&&&&&&&" + str);
}
}
public void fourReadList(List<String> list) {
for (int i = 0, a = list.size(); i < a; i++) {
String str = list.get(i);
logger.debug("debug-->>Iterator have next element:" + str);
logger.info("info-->>Iterator have next element:" + str);
logger.warn("warn-->>Iterator have next element:" + str);
logger.error("error-->>Iterator have next element:" + str);
System.out.println("########" + str);
}
}
public void fiveReadList(List<String> list) {
Iterator<String> iter = list.iterator();
while (iter.hasNext()) {
String str = iter.next();
logger.debug("debug-->>Iterator have next element:" + str);
logger.info("info-->>Iterator have next element:" + str);
logger.warn("warn-->>Iterator have next element:" + str);
logger.error("error-->>Iterator have next element:" + str);
System.out.println("$$$$$$$$" + str);
}
}
}
# An example log4j configuration file that outputs to System.out. The
# output information consists of relative time, log level, thread
# name, logger name, nested diagnostic context and the message in that
# order.
# For the general syntax of property based configuration files see the
# documenation of org.apache.log4j.PropertyConfigurator.
#配置根Logger,语法为：log4j.rootLogger=[level],appenderName,appenderName,.
#level是日志记录器的优先级，Log4j建议只使用四个级别，从高到低分别是ERROR,
#WARN,INFO,DEBUG,通过在这里定义的级别，您可以控制到应用程序中相应级别的日志信息的开关。
#比如在这里定义了INFO级别，则应用程序中所有DEBUG级别的日志信息将不被打印出来
#appenderName指的是制定日志信息输出到哪个地方
#A1标识输出控制台，A2标识输出到日志文件
log4j.rootLogger=DEBUG, A1,A2
#Log4j提供的appender有以下几种：
#org.apache.log4j.ConsoleAppender(控制台)
#org.apache.log4j.FileAppender(文件)
#org.apache.log4j.DailyRollingFileAppender（每天产生一个日志文件）
#org.apache.log4j.RollingFileAppender（文件大小到达指定尺寸的时候产生一个新的文件）
#org.apache.log4j.WriterAppender（将日志信息以流格式发送到任意指定的地方
# A1 is set to be a ConsoleAppender which outputs to System.out.
log4j.appender.A1=org.apache.log4j.ConsoleAppender
log4j.appender.A2=org.apache.log4j.RollingFileAppender
log4j.appender.A2.File=Log4jTest.log
#如果超过20KB则自动新建一个文件，文件名后面自动加序号
log4j.appender.A2.MaxFileSize=20KB
# A1 uses PatternLayout.
log4j.appender.A1.layout=org.apache.log4j.PatternLayout
# The conversion pattern uses format specifiers. You might want to
# change the pattern an watch the output format change.
log4j.appender.A1.layout.ConversionPattern=%-4r %-5p [%t] %37c %3x - %m%n
# In this example, we are not really interested in INNER loop or SWAP
# messages. See the effects of uncommenting and changing the levels of
# the following loggers.
# log4j.logger.org.apache.log4j.examples.SortAlgo.INNER=WARN
# log4j.logger.org.apache.log4j.examples.SortAlgo.SWAP=WARN
# Keep one backup file
log4j.appender.A2.MaxBackupIndex=1
log4j.appender.A2.layout=org.apache.log4j.PatternLayout
log4j.appender.A2.layout.ConversionPattern=%p %t %c - %m%n
# Print only messages of level WARN or above in the package com.foo.
log4j.logger.org.bulktree=DEBUG
引用：
http://www.blogjava.net/bulktree/archive/2008/08/13/221704.html
posted on 2008-11-14 16:25
GARY-DOU 阅读(121)
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