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PathClassLoader.java

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package myClassLoader;

import java.io.*;

/**

* 未完成

*/

public class PathClassLoader extends ClassLoader {

private String classPath;

public PathClassLoader(String classPath) {

this.classPath = classPath;

}

protected Class<?> findClass(String className) throws ClassNotFoundException {

if ("myClassLoader".startsWith(className)) {

byte[] classData = getData(className);

if (classData == null) {

throw new ClassNotFoundException();

} else {

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

}

} else {

return super.loadClass(className);

}

}

private byte[] getData(String className) {

String path = classPath + File.separatorChar + className.replace('.', File.separatorChar) + ".class";

try {

InputStream is = new FileInputStream(path);

ByteArrayOutputStream stream = new ByteArrayOutputStream();

byte[] buffer = new byte[2048];

int num = 0;

try {

while ((num = is.read(buffer)) != -1) {

stream.write(buffer, 0, num);

}

return stream.toByteArray();

} catch (IOException e) {

e.printStackTrace();

}

} catch (FileNotFoundException e) {

e.printStackTrace();

}

return null;

}

}