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使用proguard混淆j2me应用程序
import javax.microedition.midlet.midlet;
import javax.microedition.midlet.midletstatechangeexception;
import javax.microedition.lcdui.*;
import java.io.*;
import javax.microedition.io.*;
public class imagegetter extends midlet implements commandlistener
{
private display display;
public static final command conncommand = new command("connect",
command.item, 1);
public static final command exitcommand = new command("exit", command.exit,
1);
private form mainform;
private getterthread gt;
protected void startapp() throws midletstatechangeexception
{
display = display.getdisplay(this);
mainform = new form("image getter");
mainform.append("click connect to get image");
mainform.addcommand(conncommand);
mainform.addcommand(exitcommand);
mainform.setcommandlistener(this);
display.setcurrent(mainform);
gt = new getterthread(this);
gt.start();
}
public void setimage(image image)
{
mainform.append(image);
display.setcurrent(mainform);
}
protected void pauseapp()
{
}
protected void destroyapp(boolean arg0) throws midletstatechangeexception
{
}
public void commandaction(command cmd, displayable disp)
{
if (cmd == conncommand)
{
synchronized (this)
{
notify();
}
} else if (cmd == exitcommand)
{
exitmidlet();
}
}
private void exitmidlet()
{
try
{
destroyapp(false);
notifydestroyed();
} catch (midletstatechangeexception e)
{
e.printstacktrace();
}
}
class getterthread extends thread
{
private imagegetter midlet;
public static final string url = "http://localhost/j2medev.png";
private httpconnection httpconn = null;
private inputstream is = null;
public getterthread(imagegetter midlet)
{
this.midlet = midlet;
}
public void run()
{
synchronized (midlet)
{
try
{
midlet.wait();
} catch (interruptedexception e)
{
e.printstacktrace();
}
}
system.out.println("connect to server...");
try
{
httpconn = (httpconnection) connector.open(url);
is = httpconn.openinputstream();
bytearrayoutputstream baos = new bytearrayoutputstream();
int ch = 0;
while ((ch = is.read()) != -1)
{
baos.write(ch);
}
byte[] imagedata = baos.tobytearray();
image image = image.createimage(imagedata, 0, imagedata.length);
midlet.setimage(image);
baos.close();
is.close();
httpconn.close();
} catch (ioexception e)
{
e.printstacktrace();
}
}
}
}
右键选择项目getimage-j2me-create obfuscated package，这样proguard就会把除midlet之外的class文件混淆。如下图所示：
在deploy文件夹内我们可以看到getimage.jar、getimage.jad和一些proguard产生的其他文件，你可以用jar命令解开getimage.jar，发现他的另一个class文件已经被混淆成a.class了,midlet类则没有任何改变，proguard除了混淆的功能之外同时会把我们的jar文件减小，提高一些运行效率。
