Package com.budco.bmp.core.email.TestMail;
Import Java.io.ByteArrayOutputStream;
Import Java.io.File;
Import Java.io.FileInputStream;
Import java.io.FileNotFoundException;
Import java.io.IOException;
Import Java.lang.reflect.Field;
public class Testclassloader extends ClassLoader {
Path to existing file
private static final String DRIVE = "c:\\com\\budco\\bmp\\";
private static final String DRIVE1 = "com\\budco\\bmp\\";
private static final String FILETYPE = ". Class";
@Override
Public final class<?> Findclass (final String name) {
Final byte[] data = loadclassdata (name);
Final String ClassPath = Classloader.getsystemresource (DRIVE1 +
Name). replace (' \ \ ', '. ')). GetFile (). SUBSTRING (
1);
Put you to load the class with '. ' instead \ \ should be package path + class name//(DRIVE1 + name). replace (' \ \ ', '. ') ==
Com.budco.bmp.HelloWorld
Return DefineClass (DRIVE1 + name). replace (' \ \ ', '. '), data, 0, data.length);
}
Public byte[] loadClassData (final String name) {
Name = name.substring (0,name.lastindexof ('. '));
FileInputStream FIS = null;
byte[] data = null;
Final byte buffer[] = new byte[1024];
try {
FIS = new FileInputStream (new File (DRIVE + name + FILETYPE));
Final Bytearrayoutputstream BAOs = new Bytearrayoutputstream ();
int len = 0;
try {
while (len = fis.read (buffer))!=-1) {
Baos.write (buffer, 0, Len);
}
data = Baos.tobytearray ();
System.out.println ("-----------------| | | | | | | | --------------");
System.out.println (new String (data));
Baos.close ();
Fis.close ();
catch (Final IOException e) {
E.printstacktrace ();
}
catch (Final FileNotFoundException e) {
E.printstacktrace ();
}
return data;
}
/**
* @param args
*/
public static void Main (final string[] args) throws Exception {
TODO auto-generated Method Stub
Final Testclassloader loader = new Testclassloader ();
Final Testclassloader loader2 = new Testclassloader ();
Final class<?> obj = Loader.findclass ("HelloWorld");
Final class<?> o = Class.forName ("Com.budco.bmp.HelloWorld");
Final Field fs = O.getfield ("RS");
System.out.println ("------------------------ooo==" + fs.get ("RS"));
Final Class obj2 = Loader2.loadclass ("Test2", true);
Final Object objclass = Obj.newinstance ();
System.out.println ("==========1" + Objclass.getclass ());
System.out.println ("==========2" + obj.getname ());
System.out.println ("==========3" + Obj.getclassloader ());
System.out.println ("----------------------4" + obj.getcanonicalname ());
Final Field f1 = Obj.getfield ("RS");
Final String s = (String) f1.get ("RS");
System.out.println ("-------------------" + s);
Only the public domain name can be obtained
Final Field F2 = Obj.getfield ("txt");
Final String s2 = (string) f2.get ("txt");
System.out.println ("-------------------" + s2);
}
Public final class GG {
}
}
Here is the test class Helloworld.java want this class to compile. class file
Package com.budco.bmp;
public class HelloWorld {
Private String name = NULL;
private static final String DRIVE = "c:\\com\\budco\\bmp\\";
Public final static String RS = "HAL";
Public final static String txt = "txt";
Public String GetName () {
return name;
}
public void SetName (final String name) {
THIS.name = name;
}
Private String Getmethodname () {
This.setname ("ale");
System.out.println ("-------------");
Return "";
}
/**
* @param args
*/
public static void Main (final string[] args) {
TODO auto-generated Method Stub
System.out.println ("---------HelloWorld!----");
String path = "";
Path = drive.replace (' \ \ ', '. ');
SYSTEM.OUT.PRINTLN (path);
}
}
