自定义log4j 加载器

package com.ericsson.ma.jbl.midwsv.midwsv.internal.action;

 

import java.io.ByteArrayOutputStream;

import java.io.File;

import java.net.URL;

import java.net.URLClassLoader;

import java.util.Enumeration;

import java.util.jar.JarEntry;

import java.util.jar.JarFile;

 

import javax.xml.transform.Transformer;

import javax.xml.transform.TransformerFactory;

import javax.xml.transform.dom.DOMSource;

import javax.xml.transform.stream.StreamResult;

 

import org.w3c.dom.Document;

 

public class CustomLogger {

 

static CustomLogger logger;

Object logger_object;

 

public static  CustomLogger getLogger(Class clazz){

File file = new File("/var/sog/logs/pm/log4j/");

if(file.exists()){

File[] files = file.listFiles();

if(files!=null && files.length>0){

try {

URLClassLoader loader = loadJar(files,clazz);

Class c = loader.loadClass("org.apache.log4j.Logger");

Object logger_object = c.getMethod("getLogger", Class.class).invoke(null, clazz);

Class c1 = loader.loadClass("org.apache.log4j.xml.DOMConfigurator");

File log4j_xml = new File("/var/sog/logs/pm/log4j/log4j.xml");

 

if(log4j_xml.exists()){

c1.getMethod("configure", String.class).invoke(null, "/var/sog/logs/pm/log4j/log4j.xml");

}

 

logger = new CustomLogger();

logger.logger_object = logger_object;

return logger;

} catch (Exception e) {

e.printStackTrace();

}

}

}

return new CustomLogger();

 

}

 

public void debug(String message){

if(logger_object!=null){

try{

logger_object.getClass().getMethod("debug", Object.class).invoke(logger_object, message);

} catch (Exception e) {

e.printStackTrace();

}

 

}           

}

 

public void debug(Document doc){

if(logger_object!=null){

try{

String xml = tranferFromDom2String(doc);

logger_object.getClass().getMethod("debug", Object.class).invoke(logger_object, xml);

} catch (Exception e) {

e.printStackTrace();

}

 

}           

}

 

 

private String tranferFromDom2String(Document doc) throws Exception{

TransformerFactory transformerFactory = TransformerFactory.newInstance();

Transformer transformer = transformerFactory.newTransformer();

 

ByteArrayOutputStream  bos  =  new  ByteArrayOutputStream();

StreamResult result = new StreamResult(bos);

transformer.transform(new DOMSource(doc), result);

String xml = bos.toString();

bos.close();

 

return xml;

}

public void info(Object message){

if(logger_object!=null){

try{

logger_object.getClass().getMethod("info", Object.class).invoke(logger_object, message);

} catch (Exception e) {

e.printStackTrace();

}

 

}

}

 

public void warn(Object message){

if(logger_object!=null){

try{

logger_object.getClass().getMethod("warn", Object.class).invoke(logger_object, message);

} catch (Exception e) {

e.printStackTrace();

}

 

}

 

}

 

public void error(Object message){

if(logger_object!=null){

try{

logger_object.getClass().getMethod("error", Object.class).invoke(logger_object, message);

} catch (Exception e) {

e.printStackTrace();

}

 

}

}

 

public static URLClassLoader loadJar(File[] fileArray,Class clazz) throws Exception{

URL[] urlarray = new URL[fileArray.length];

int i=0;

for(File f : fileArray){

URL   url =  f.toURI().toURL();

urlarray[i]=url;

i++;

}

 

 

URLClassLoader   loader = new URLClassLoader(urlarray, clazz.getClassLoader());

//loader.loadClass("org.apache.log4j.net.JMSSink");

for(File f : fileArray){

if(f.getName().equals(".jar")){

JarFile jarfile = new JarFile(f);

Enumeration<JarEntry> jarEntry = jarfile.entries();

while(jarEntry.hasMoreElements()){

JarEntry  je = jarEntry.nextElement();

 

if(je.getName().endsWith(".class")){

//System.out.println(je.getName());

String classpath = je.getName().replaceAll("/", ".").replaceAll(".class", "");

if(!classpath.equals("org.apache.log4j.net.JMSSink")){

continue;

}else if(!classpath.equals("javax/mail/Authenticator".replace("/", "."))){

continue;

}

loader.loadClass(classpath);

 

}

}

}else{

//loader.getResource(name)

}

 

 

}

 

return loader;

 

}

 

/**

* @param args

*/

 

/**

* @param args

*/

public static void main(String[] args) {

// TODO Auto-generated method stub

 

}

 

}