加载log4j 加载器

ehanmqi@CN00202245 /C/Ericsson/maworkspace_15/Hello/lib

$ pwd

/C/Ericsson/maworkspace_15/Hello/lib

ehanmqi@CN00202245 /C/Ericsson/maworkspace_15/Hello/lib

$ ls -l

total 265

-rw-r--r--    1 ehanmqi  Administ   489884 Jun 16 15:27 log4j-1.2.17.jar

-rw-r--r--    1 ehanmqi  Administ    41071 Jun 16 15:24 slf4j-api-1.7.21.jar

-rw-r--r--    1 ehanmqi  Administ     9988 Jun 16 15:24 slf4j-log4j12-1.7.21.jar

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 org.slf4j.Logger;

public class TestClassLoader2 {

private static Logger logger;

/**

* @param args

*/

public static void main(String[] args) {

try {

System.out.println(TestClassLoader2.class.getClassLoader());

//URL   url = new File("C:/Users/ehanmqi/.m2/repository/org/slf4j/slf4j-log4j12/1.7.5/slf4j-log4j12-1.7.5.jar").toURI().toURL();

File file = new File("C:/Ericsson/maworkspace_15/Hello/lib");

URLClassLoader loader = loadJar(file.listFiles());

Class c = loader.loadClass("org.slf4j.LoggerFactory");

//c.getMethod("getLogger", Class.class).invoke(null, TestClassLoader2.class);

logger = (Logger) c.getMethod("getLogger", Class.class).invoke(null, TestClassLoader2.class);

logger.debug("sdfsf");

}catch (Exception e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

}

public static URLClassLoader loadJar(File[] fileArray) 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, TestClassLoader2.class.getClassLoader());

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

for(File f : fileArray){

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);

}

}

}

return loader;

}

}