Java 外部 log4j.xml 文件
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/2594689/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
External log4j.xml file
提问by javamonkey79
I am trying to run a jar with the log4j.xml file on the file system outside the jar like so:
我正在尝试在 jar 外部的文件系统上运行一个带有 log4j.xml 文件的 jar，如下所示：
java -jar MyJarName.jar -cp=/opt/companyName/pathToJar/ log4j.configuration=log4j.xml argToJar1 argToJar2
I have also tried:
我也试过：
java -jar MyJarName.jar -cp=/opt/companyName/pathToJar/ log4j.configuration=/opt/companyName/pathToJar/log4j.xml argToJar1 argToJar2
The log4j.xml is file is in the same directory as the jar (/opt/companyName/pathToJar/), yet I still get the standard warning message:
log4j.xml 文件与 jar (/opt/companyName/pathToJar/) 位于同一目录中，但我仍然收到标准警告消息：
log4j:WARN No appenders could be found for logger (org.apache.axis.i18n.ProjectResourceBundle).
log4j:WARN Please initialize the log4j system properly.
Is it possible to have the config file outside the jar, or do I have to package it with the jar?
是否可以将配置文件放在 jar 之外，还是必须将其与 jar 一起打包？
TIA
TIA
采纳答案by Jason Day
When using the -jarswitch to launch an executable jar file, the classpath is obtained from the jar file's manifest. The -cpswitch, if given, is ignored.
使用-jar开关启动可执行 jar 文件时，类路径是从 jar 文件的清单中获取的。该-cp开关，如果给定的，被忽略。
Jeff Storey's answeris going to be the easiest solution. Alternatively, you could add a Class-Pathattribute to the jar file's manifest.
Jeff Storey 的答案将是最简单的解决方案。或者，您可以Class-Path向 jar 文件的manifest添加一个属性。
EDITTry enabling log4j debugging, and making the path to log4j.xmla fully-qualified URL. For example:
编辑尝试启用 log4j 调试，并将路径设置log4j.xml为完全限定的 URL。例如：
java -Dlog4j.debug -Dlog4j.configuration=file:/path/to/log4j.xml -jar ...
回答by Jeff Storey
Have you tried java -Dlog4j.configuration=/path/to/log4j.xml -jar <rest-of-args>
你有没有尝试过 java -Dlog4j.configuration=/path/to/log4j.xml -jar <rest-of-args>
回答by Thorbj?rn Ravn Andersen
"-jar" only uses the classpath inside the executable jar, and -cp is ignored. Adding "." to the classpath in the executable jar should allow log4j.xml to be fount.
“-jar”仅使用可执行 jar 内的类路径，而忽略 -cp。加“.” 到可执行 jar 中的类路径应该允许输入 log4j.xml。
回答by tibi
this works:
这有效：
java -jar -Dlog4j.configuration="file:d:\log4j.xml" myjar.jar
回答by VlatkoB
I had problems using log4j with Sun's JDK and automatic configuration.
我在 Sun 的 JDK 和自动配置中使用 log4j 时遇到了问题。
You can use this:
你可以使用这个：
String filename = System.getProperty("log4j.configuration");
DOMConfigurator(filename);
before using Logger.
在使用记录器之前。
回答by Koray Güclü
you can define a default properties file in the jar. if no custom properties is defined you can use this default file.if a custom property is defined you can override the default property.
您可以在 jar 中定义默认属性文件。如果未定义自定义属性，您可以使用此默认文件。如果定义了自定义属性，您可以覆盖默认属性。
myjar.jar file contains log4j.default.configuration
myjar.jar 文件包含 log4j.default.configuration
you can run your program with this parameters to start your application
您可以使用此参数运行您的程序以启动您的应用程序
java -jar -Dlog4j.configuration=log4j.properties target\yourfile-v01_000_01_c002.jar
Example code
示例代码
public static void main(String[] args) {
String filename = System.getProperty("log4j.configuration");
if(null==filename||filename.trim().equals("")) {
logger.info("Using default log4j configuration log4j.default.properties.");
logger.info("If you would like to change the default configuration please add following param before startup -Dlog4j.configuration=<log4jfile>");
PropertyConfigurator.configure( Main.class.getResourceAsStream("/log4j.default.properties"));
} else {
File file = new File(filename);
if(!file.exists()) System.out.println("It is not possible to load the given log4j properties file :"+file.getAbsolutePath());
else PropertyConfigurator.configure(file.getAbsolutePath());
}
}
回答by r00tGER
For log4j2, use configurationFileoption:
对于 log4j2，使用configurationFile选项：
java -Dlog4j.configurationFile=/path/to/log4j2.xml -jar ...
http://logging.apache.org/log4j/2.0/manual/configuration.html
http://logging.apache.org/log4j/2.0/manual/configuration.html
回答by Dayong
java -cp "path/to/your/log4jxml:path/to/yourjar.jar" your.package.MainClass
java -cp "path/to/your/log4jxml:path/to/yourjar.jar" your.package.MainClass
The log4j.xml in directory "path/to/your/log4jxml" will overwrite the log4j.xml file in "path/to/yourjar.jar".
目录“path/to/your/log4jxml”中的log4j.xml 将覆盖“path/to/yourjar.jar”中的log4j.xml 文件。
Please refer to Setting multiple jars in java classpath.
回答by another
The simplest path configuration for ``log4j2is using thestatic blocksettinglog4j.configurationFile`:
``log4j2is using the静态块settinglog4j.configurationFile`最简单的路径配置：
public class MyClass {
static {
System.setProperty("log4j.configurationFile", "./config/log4j2.xml");
}
protected final transient Logger logger = LogManager.getLogger(IDOLTracker.class);
public static void main(String[] args) {
logger.info("");
}
}
Then the structure could be as:
那么结构可以是：
ProgramFolder
|---- /config/log4j2.xml
|---- MyClass.jar
程序文件夹
|---- /config/log4j2.xml
|---- MyClass.jar
When you run your jar, it will look outside the jar for the xml file.
当您运行 jar 时，它将在 jar 外部查找 xml 文件。
