[求助]IO包如何读写图片文件?

JAVA的IO包如何读写图片文件?
最好能告诉我个实例,谢谢!

如果我下面写的错的不是特离谱,帮我改一下更好,谢谢!!

我这写完了全是乱码..
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import java.io.*;

class IOTest
{
public static void main(String[] args) throws IOException
{
DataInputStream in = new DataInputStream(new BufferedInputStream(new FileInputStream("1.jpg")));
DataOutputStream out = new DataOutputStream(new BufferedOutputStream(new FileOutputStream("2.jpg")));

int i =in.read();
while(i!=-1)
{
i =in.read();
out.write(i);
}
out.flush();
in.close();
out.close();
}
}

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import java.io.*;

class IOTest{
public static void main(String[] args) throws IOException{
DataInputStream din = new DataInputStream(new BufferedInputStream(new FileInputStream("1.jpg")));
DataOutputStream out = new DataOutputStream(new BufferedOutputStream(new FileOutputStream("2.jpg")));
int i=din.available();
byte[] b=new byte[i];
din.readFully(b);
out.write(b);
out.flush();
din.close();
out.close();
}
}

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你少写一个东西,是专门读写读书的文件流通

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谢谢!可以解决了.
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