当你扩展类时，AppenderSkeleton我会假设你应该在public void activateOptions()你应该覆盖的方法中初始化你的 webservice 类。我已经编写了 DatabaseAppender 和 JmsAppender log4j 记录器，我总是发现我必须初始化 db 连接或 jms 连接，或者在你的情况下，public void activateOptions()方法中的 webservice 属性。
然后像往常一样在append(LoggingEvent)方法中调用 web 服务。
我是否建议实现一个 BlockingQueue 来存储所有 LoggingEvent 对象，这样如果您收到大量日志消息，它们就会排队并异步发送到 Web 服务。
更新为包含模板 Log4j 类
尝试使用以下模板。我在重要部分添加了评论。基本上，在 activateOptions 和 processEvent 方法中，您将初始化“连接”并发送事件对象。可以是 DB、JMS、WebService ...等。
package mypackage;
import java.util.concurrent.BlockingQueue;
import java.util.concurrent.LinkedBlockingQueue;
import java.util.concurrent.TimeUnit;
import org.apache.log4j.AppenderSkeleton;
import org.apache.log4j.helpers.LogLog;
import org.apache.log4j.spi.LoggingEvent;
public class WebServiceAppender extends AppenderSkeleton {
private static final BlockingQueue<LoggingEvent> loggingEventQueue = new LinkedBlockingQueue<LoggingEvent>();
private static WebServiceAppender instance;
private static Thread thread = null;
//Your custom properties for your web service
private String property1;
private String property2;
private String property3;
static {
thread = new Thread(new Runnable() {
public void run() {
processQueue();
}
});
thread.setDaemon(true);
thread.start();
}
private static void processQueue() {
while(true) {
try {
LoggingEvent event = loggingEventQueue.poll(1L, TimeUnit.SECONDS);
if (event != null) {
instance.processEvent(event);
}
}
catch(InterruptedException e) {
// No operations.
}
}
}
private final void processEvent(LoggingEvent loggingEvent) {
if(loggingEvent != null) {
//Send the loggingEvent object or you can
//get data out of it and package it in another
//java class and send that, to your web service.
//Web Service is invoked here
}
}
public synchronized void close() {
// The synchronized modifier avoids concurrent append and close operations
if(this.closed) {
return;
}
closeWS();
thread.interrupt();
LogLog.debug("Closing appender [" + name + "].");
this.closed = true;
}
private void closeWS() {
try {
//Close the webservice connection
//or whatever here.
}
catch(Exception ex) {
LogLog.error("Error while closing WebServiceAppender [" + name + "].", ex);
}
}
public boolean requiresLayout() {
//Does not need a layout because
//we are sending serialized events
//to an external source
return false;
}
@Override
public void activateOptions() {
instance = this;
try {
LogLog.debug("Getting web service properties.");
if(property1 != null) {
//Do something with your property
}
if(property2 != null) {
//Do something with your property
}
if(property3 != null) {
//Do something with your property
}
//Initialize your web-service connection and objects here
LogLog.debug("Web Service created.");
}
catch(Exception ex) {
LogLog.error("Error while activating options for WebServiceAppender [" + name + "].", ex);
}
}
/*
* These methods are set from the log4j properties file like:
* log4j.appender.WS=mypackage.WebServiceAppender
* log4j.appender.WS.property1=bla
* log4j.appender.WS.property2=ble
* log4j.appender.WS.property3=blo
*/
public final String getProperty1() {
return property1;
}
public final String getProperty2() {
return property2;
}
public final String getProperty3() {
return property3;
}
public final void setProperty1(String property1) {
this.property1 = property1;
}
public final void setProperty2(String property2) {
this.property2 = property2;
}
public final void setProperty3(String property3) {
this.property3 = property3;
}
@Override
protected void append(LoggingEvent event) {
loggingEventQueue.add(event);
}
@Override
public void finalize() {
close();
super.finalize();
}
}