常用log4j配置

 1### 设置com.unmi域对应的级别INFO,DEBUG,WARN,ERROR和输出地A1，A2 ##
 2log4j.category.com.unmi = ERROR,A1
 3log4j.category.com.unmi = INFO,A2
 4
 5### 一般把上面两行写如下方式，统一控制日志输出,再用log4j.logger设置包独立的输出级别 ##
 6log4j.rootLogger = DEBUG,A1
 7log4j.logger.com.unmi.special = ERROR
 8
 9### 设置输出地A1，为ConsoleAppender(控制台) ##
10log4j.appender.A1 = org.apache.log4j.ConsoleAppender
11
12### 设置A1的输出布局格式PatterLayout,(可以灵活地指定布局模式）##
13log4j.appender.A1.layout = org.apache.log4j.PatternLayout
14
15### 配置日志输出的格式##
16log4j.appender.A1.layout.ConversionPattern = %d{yyyy-MM-dd HH:mm:ss,SSS} [%c]-[%p] %m%n
17
18### 设置输出地A2到文件（文件大小到达指定尺寸的时候产生一个新的文件）##
19log4j.appender.A2 = org.apache.log4j.RollingFileAppender
20
21### 文件位置##
22log4j.appender.A2.File = E:/study/log4j/log.html
23
24### 文件大小##
25log4j.appender.A2.MaxFileSize = 500KB
26
27log4j.appender.A2.MaxBackupIndex = 1
28
29##指定采用html方式输出
30log4j.appender.A2.layout = org.apache.log4j.HTMLLayout

 1<?xml version="1.0" encoding="GB2312" ?>
 2<!DOCTYPE log4j:configuration SYSTEM "log4j.dtd">
 3
 4<log4j:configuration xmlns:log4j = "http://jakarta.apache.org/log4j/" >
 5
 6    <appender name = "com.unmi.all" class = "org.apache.log4j.RollingFileAppender" >
 7
 8      <!-- 设置 appender Name:com.unmi.all和输出方式：org.apache.log4j.RollingFileAppender -->
 9       <param name = "File" value = "E:/study/log4j/all.output.log" / ><!-- 设置File参数：日志输出文件名 -->
10       <param name = "Append" value = "false" / ><!-- 设置是否在重新启动服务时，在原有日志的基础添加新日志 -->
11       <param name = "MaxBackupIndex" value = "10" / >
12       <layout class = "org.apache.log4j.PatternLayout" >
13           <param name = "ConversionPattern" value = "%p (%c:%L)- %m%n" / ><!-- 设置输出文件项目和格式 -->
14       </layout >
15    </appender >
16
17    <appender name = "com.unmi.xyz" class = "org.apache.log4j.RollingFileAppender" >
18       <param name = "File" value = "E:/study/log4j/xyz.output.log" / >
19       <param name = "Append" value = "true" / >
20       <param name = "MaxFileSize" value = "10240" / > <!-- 设置文件大小 -->
21       <param name = "MaxBackupIndex" value = "10" / >
22       <layout class = "org.apache.log4j.PatternLayout" >
23           <param name = "ConversionPattern" value = "%p (%c:%L)- %m%n" / >
24       </layout >
25    </appender >
26
27    <logger name = "unmi.log" > <!-- 设置包名限制，即unmi.log域及以下的日志均输出到下面对应的 appender 中 -->
28       <level value = "debug" / ><!-- 设置级别 -->
29       <appender-ref ref = "com.unmi.xyz" / ><!-- 与前面的配置的 appender name 相对应 -->
30    </logger >
31
32    <root > <!-- 设置接收所有输出的 appender -->
33       <appender-ref ref = "com.unmi.all" / ><!-- 与前面的 appender name 相对应 -->
34    </root >
35
36</log4j:configuration>

 1import  org.apache.log4j.Logger;
 2import  org.apache.log4j.PropertyConfigurator;
 3import  org.apache.log4j.xml.DOMConfigurator;
 4
 5public class Log4jApp {
 6   public static void main(String[] args) {
 7       DOMConfigurator.configure("E:/study/log4j/log4j.xml"); //加载.xml文件
 8       //PropertyConfigurator.configure("E:/study/log4j/log4j.properties");//加载.properties文件
 9
10       Logger log = Logger.getLogger("com.unmi.test");
11       log.info("测试");
12    }
13}