package util.tom;

import java.io.*;

public class ThreadClassLoader extends Thread {

@Override

public void run() {

//判斷類上下文加載器,是不是我們指定的加載器

System.err.printf("clName:%s\n" ,Thread.currentThread().getContextClassLoader().getClass().getName() );

}

public static void main(String[] args) {

Thread td = new Thread(new Runnable() {

@Override

public void run() {

(new ThreadClassLoader()).start();

}

});

//設置線程上下文類加載器

td.setContextClassLoader(new MySelfClassLoader());

td.start();

}

}

class MySelfClassLoader extends ClassLoader {

private String root;

@Override

protected Class> findClass(String name) throws ClassNotFoundException {

byte[] classData = loadClassData(name);

if (classData == null) {

throw new ClassNotFoundException();

} else {

return defineClass(name , classData , 0 , classData.length);

}

}

private byte[] loadClassData(String className) {

String fileName = root+File.separatorChar+className.replace('.' , File.separatorChar)+".class";

try {

InputStream ins = new FileInputStream(fileName);

ByteArrayOutputStream baos = new ByteArrayOutputStream();

int bufferSize = 1024;

byte[] buffer = new byte[bufferSize];

int length = 0;

while ((length = ins.read(buffer)) != -1) {

baos.write(buffer , 0 , length);

}

return baos.toByteArray();

} catch (IOException e) {

e.printStackTrace();

}

return null;

}

public String getRoot() {

return root;

}

public void setRoot(String root) {

this.root = root;

}

}

總結

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