java - 日志消息不写入日志文件

Question

我已经使用 Log4j 配置了一个项目。我已经使用 log4.properties 文件配置了 log4j。 当测试运行时，它会创建 myLog.log 文件，但不会将任何内容写入日志文件。 我们使用的 Appender 为 RollingFileAppender 和 log4j.rootLogger=DEBUG。

任何人都可以提出可能导致此问题的原因吗？

这是该项目的 log4j.properties。

log4j.rootLogger= DEBUG, ConsoleAppender, Rolling 
log4j.appender.ConsoleAppender=org.apache.log4j.ConsoleAppender 
log4j.appender.ConsoleAppender.layout=org.apache.log4j.PatternLayout 

log4j.appender.ConsoleAppender.layout.ConversionPattern=%d %-2p %c.%M(): %m%n 
log4j.appender.Rolling=org.apache.log4j.RollingFileAppender 
log4j.appender.Rolling.MaxFileSize=5MB 
log4j.appender.Rolling.MaxBackupIndex=2 
log4j.appender.Rolling.File=D:\Logs\myProj.log 
log4j.appender.Rolling.layout = org.apache.log4j.PatternLayout 
log4j.appender.Rolling.layout.ConversionPattern=%d %-4p %c.%M(): %m%n 
## Following two lines have been removed now.
log4j.logger.com=WARN 
log4j.logger.org=WARN

收到日志文件中的日志:

2012-01-16 22:02:08,534 DEBUG org.apache.http.headers.receiveResponseHeader(): << content-type: application/json; charset=UTF-8
2012-01-16 22:02:08,534 DEBUG org.apache.http.headers.receiveResponseHeader(): << connection: close
2012-01-16 22:02:08,534 DEBUG org.apache.http.headers.receiveResponseHeader(): << content-length: 236
2012-01-16 22:02:08,550 DEBUG org.apache.http.headers.receiveResponseHeader(): << server: httpd.js
2012-01-16 22:02:08,550 DEBUG org.apache.http.headers.receiveResponseHeader(): << date: Tue, 17 Jan 2012 03:02:06 GMT
2012-01-16 22:02:08,566 DEBUG org.apache.http.wire.wire(): << "{"name":"clickElement","sessionId":"2fad55cf-670e-44f3-ab60-7d2f76f641e6","status":0,"value":"This action is final and cannot be undone?"}"
2012-01-16 22:02:08,566 DEBUG org.apache.http.impl.conn.DefaultClientConnection.shutdown(): Connection shut down
2012-01-16 22:02:08,566 DEBUG org.apache.http.impl.conn.tsccm.ThreadSafeClientConnManager.releaseConnection(): Released connection is not reusable.
2012-01-16 22:02:08,566 DEBUG org.apache.http.impl.conn.tsccm.ConnPoolByRoute.freeEntry(): Releasing connection [HttpRoute[{}->http://127.0.0.1:7055]][null]
2012-01-16 22:02:08,566 DEBUG org.apache.http.impl.conn.tsccm.ConnPoolByRoute.notifyWaitingThread(): Notifying no-one, there are no waiting threads
2012-01-16 22:02:10,566 DEBUG org.apache.http.impl.conn.tsccm.ThreadSafeClientConnManager.getConnection(): Get connection: HttpRoute[{}->http://127.0.0.1:7055], timeout = 120000
2012-01-16 22:02:10,566 DEBUG org.apache.http.impl.conn.tsccm.ConnPoolByRoute.getEntryBlocking(): [HttpRoute[{}->http://127.0.0.1:7055]] total kept alive: 0, total issued: 0, total allocated: 0 out of 2000
2012-01-16 22:02:10,566 DEBUG org.apache.http.impl.conn.tsccm.ConnPoolByRoute.getFreeEntry(): No free connections [HttpRoute[{}->http://127.0.0.1:7055]][null]
2012-01-16 22:02:10,566 DEBUG org.apache.http.impl.conn.tsccm.ConnPoolByRoute.getEntryBlocking(): Available capacity: 2000 out of 2000 [HttpRoute[{}->http://127.0.0.1:7055]][null]
2012-01-16 22:02:10,581 DEBUG org.apache.http.impl.conn.tsccm.ConnPoolByRoute.createEntry(): Creating new connection [HttpRoute[{}->http://127.0.0.1:7055]]
2012-01-16 22:02:10,597 DEBUG org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(): Connecting to 127.0.0.1:7055
2012-01-16 22:02:10,597 DEBUG org.apache.http.client.protocol.RequestAddCookies.process(): CookieSpec selected: best-match
2012-01-16 22:02:10,597 DEBUG org.apache.http.client.protocol.RequestAuthCache.process(): Auth cache not set in the context
2012-01-16 22:02:10,597 DEBUG org.apache.http.impl.client.DefaultHttpClient.tryExecute(): Attempt 1 to execute request
2012-01-16 22:02:10,597 DEBUG org.apache.http.impl.conn.DefaultClientConnection.sendRequestHeader(): Sending request: GET /hub/session/2fad55cf-670e-44f3-ab60-7d2f76f641e6/alert_text HTTP/1.1
2012-01-16 22:02:10,597 DEBUG org.apache.http.wire.wire(): >> "GET /hub/session/2fad55cf-670e-44f3-ab60-7d2f76f641e6/alert_text HTTP/1.1[\r][\n]"
2012-01-16 22:02:10,597 DEBUG org.apache.http.wire.wire(): >> "Accept: application/json, image/png[\r][\n]"
2012-01-16 22:02:10,597 DEBUG org.apache.http.wire.wire(): >> "Host: 127.0.0.1:7055[\r][\n]"
2012-01-16 22:02:10,597 DEBUG org.apache.http.wire.wire(): >> "Connection: Keep-Alive[\r][\n]"
2012-01-16 22:02:10,597 DEBUG org.apache.http.wire.wire(): >> "[\r][\n]"
2012-01-16 22:02:10,597 DEBUG org.apache.http.headers.sendRequestHeader(): >> GET /hub/session/2fad55cf-670e-44f3-ab60-7d2f76f641e6/alert_text HTTP/1.1
2012-01-16 22:02:10,597 DEBUG org.apache.http.headers.sendRequestHeader(): >> Accept: application/json, image/png
2012-01-16 22:02:10,597 DEBUG org.apache.http.headers.sendRequestHeader(): >> Host: 127.0.0.1:7055
2012-01-16 22:02:10,597 DEBUG org.apache.http.headers.sendRequestHeader(): >> Connection: Keep-Alive
2012-01-16 22:02:10,612 DEBUG org.apache.http.wire.wire(): << "HTTP/1.1 200 OK[\r][\n]"
2012-01-16 22:02:10,612 DEBUG org.apache.http.wire.wire(): << "content-type: application/json; charset=UTF-8[\r][\n]"
2012-01-16 22:02:10,612 DEBUG org.apache.http.wire.wire(): << "connection: close[\r][\n]"
2012-01-16 22:02:10,612 DEBUG org.apache.http.wire.wire(): << "content-length: 236[\r][\n]"
2012-01-16 22:02:10,612 DEBUG org.apache.http.wire.wire(): << "server: httpd.js[\r][\n]"
2012-01-16 22:02:10,612 DEBUG org.apache.http.wire.wire(): << "date: Tue, 17 Jan 2012 03:02:10 GMT[\r][\n]"
2012-01-16 22:02:10,612 DEBUG org.apache.http.wire.wire(): << "[\r][\n]"
2012-01-16 22:02:10,612 DEBUG org.apache.http.impl.conn.DefaultClientConnection.receiveResponseHeader(): Receiving response: HTTP/1.1 200 OK

Answer 1

首先，确保您的 log4j.properties 已加载到类路径中。我假设如果它是一个 web 应用程序，也可以在 WEB-INF/classes 目录中找到该文件。但因为你说文件正在创建，所以我认为这不是问题。

所以，尝试一下

log4j.rootLogger= DEBUG, Console, Rolling 
log4j.appender.Console=org.apache.log4j.ConsoleAppender 
log4j.appender.Console.layout=org.apache.log4j.PatternLayout 

log4j.appender.Console.layout.ConversionPattern=%d %-2p %c.%M(): %m%n 
log4j.appender.Rolling=org.apache.log4j.RollingFileAppender 
log4j.appender.Rolling.MaxFileSize=5MB 
log4j.appender.Rolling.MaxBackupIndex=2 
log4j.appender.Rolling.File=D:\Logs\myProj.log 
log4j.appender.Rolling.layout = org.apache.log4j.PatternLayout 
log4j.appender.Rolling.layout.ConversionPattern=%d %-4p %c.%M(): %m%n 

请注意，我已删除最后两行。

基本上，这些行将所有以 com 和 org 开头的包的日志级别设置为 WARN。因此，除非您记录了任何WARN消息，否则您将不会在日志文件中看到任何内容。

您可以通过执行类似的操作来尝试级别

log4j.logger.com.foo.bar=DEBUG
log4j.logger.com.foo.bar.MyClass=TRACE

以上将在 DEBUG 中打印所有 com.foo.bar 日志，而在 DEBUG 中将打印 com.foo.bar.MyClass 日志TRACE 级别。