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| import java.io.*;
public class MyClassLoader extends ClassLoader {
private String path;
private String classLoaderName;
public MyClassLoader(String path, String classLoaderName) {
this.path = path;
this.classLoaderName = classLoaderName;
}
@Override
public Class<?> findClass(String name) throws ClassNotFoundException {
byte[] b = loadClassData(name);
return defineClass(name, b, 0, b.length);
}
public byte[] loadClassData(String name){
name = path+name+".class";
System.out.println(name);
InputStream in = null;
ByteArrayOutputStream out = null;
try {
in = new FileInputStream(new File(name));
out = new ByteArrayOutputStream();
int i = 0;
while ((i = in.read()) != -1) {
out.write(i);
}
}catch (Exception e){
e.printStackTrace();
}finally {
try {
out.close();
in.close();
} catch (IOException e) {
e.printStackTrace();
}
}
return out.toByteArray();
}
public static void main(String[] args) throws ClassNotFoundException, InstantiationException, IllegalAccessException {
MyClassLoader myClassLoader = new MyClassLoader("src/main/java/", "MyClassLoader");
Class c = myClassLoader.findClass("MyClass");
System.out.println(c.getClassLoader());
System.out.println(c.getClassLoader().getParent());
System.out.println(c.getClassLoader().getParent().getParent());
c.newInstance();
}
}
|
