一、log4j日志框架的理论和不同场景使用

setContentType(String)
设置 text/html 为 HTML内容的内容类型。默认为 text/htmlsetLocationInfo(String)
设置位置信息记录事件。默认为 falsesetTitle(String)
设置为HTML文件的标题。默认值是Log4j的日志信息

log4j.properties文件：
# Define the root logger with appender file
log = D\://ceshiZJB/learnLogs/log4-demo
log4j.rootLogger = DEBUG, FILE# Define the file appender
log4j.appender.FILE=org.apache.log4j.FileAppender
log4j.appender.FILE.File=${log}/htmlLayout.html# Define the layout for file appender
log4j.appender.FILE.layout=org.apache.log4j.HTMLLayout
log4j.appender.FILE.layout.Title=HTML Layout Example
log4j.appender.FILE.layout.LocationInfo=true

import java.io.*;
import java.sql.SQLException;import org.apache.log4j.Logger;public class log4jExample{
/* Get actual class name to be printed on */
static Logger log = Logger.getLogger(
log4jExample.class.getName()); public static void main(String[] args)
throws IOException,SQLException{ log.debug("Hello this is an debug message");
log.info("Hello this is an info message");
}
}

方法1：log4j.logger.[logger-name]=level, appender1,appender..n
方法2：可以编写以XML格式相同的结构如下：
<logger name="com.apress.logging.log4j" additivity="false">
<appender-ref ref="appender1"/>
<appender-ref ref="appender2"/>
</logger>
方法3:如果想要添加Appender对象到程序，那么可以使用下面的方法：
public void addAppender(Appender appender);
addAppender()方法添加一个appender到Logger对象。作为示例配置演示，可以添加很多Appender对象到记录器在逗号分隔的列表，每个打印日志信息分离目的地。

# Define the root logger with appender file
log = D\://ceshiZJB/learnLogs/log4-demo
# Define the root logger with appender file
log4j.rootLogger = DEBUG, FILE# Define the file appender
log4j.appender.FILE=org.apache.log4j.DailyRollingFileAppender
# Set the name of the file
log4j.appender.FILE.File=${log}/log.out# Set the immediate flush to true (default)
log4j.appender.FILE.ImmediateFlush=true# Set the threshold to debug mode
log4j.appender.FILE.Threshold=debug# Set the append to false, should not overwrite
log4j.appender.FILE.Append=true# Set the DatePattern
log4j.appender.FILE.DatePattern='.' yyyy-MM-dd-HH-mm# Define the layout for file appender
log4j.appender.FILE.layout=org.apache.log4j.PatternLayout
log4j.appender.FILE.layout.conversionPattern=%m%n

public class log4jExample{
/* 每分钟生成日志文件
* */
static Logger log = Logger.getLogger(
log4jExample.class.getName());
static Object obj =new Object(); public static void main(String[] args)
throws IOException,SQLException, InterruptedException{ synchronized (obj) {
for(int i=0;i<350;i++){
obj.wait(1000L);
log.debug("Hello this is an debug message"+i);
//log.info("Hello this is an info message");
}
} }
}

方法1：
private static org.apache.log4j.Logger log = Logger.getLogger(LogClass.class);
log.setLevel(Level.WARN);
方法2：
# Define the root logger with appender file
log = /usr/home/log4j
log4j.rootLogger = WARN, FILE# Define the file appender
log4j.appender.FILE=org.apache.log4j.FileAppender
log4j.appender.FILE.File=${log}/log.out# Define the layout for file appender
log4j.appender.FILE.layout=org.apache.log4j.PatternLayout
log4j.appender.FILE.layout.conversionPattern=%m%n