我想做什么：
client connects to server
server sends READY
client takes screenshot and sends it
server processes image
server sends READY
client takes screenshot and sends it
server processes image
...
我有一个工作的客户端和服务器：
Client() {
try {
socket = new Socket(host, 4444);
in = new DataInputStream(socket.getInputStream());
out = new DataOutputStream(socket.getOutputStream());
int ix = 0;
while (true) {
switch (in.readInt()) {
case Var.READY:
image = new Robot().createScreenCapture(new Rectangle(Toolkit.getDefaultToolkit().getScreenSize()));
ByteArrayOutputStream byteArrayO = new ByteArrayOutputStream();
ImageIO.write(image,"PNG",byteArrayO);
byte [] byteArray = byteArrayO.toByteArray();
out.writeInt(byteArray.length);
out.write(byteArray);
System.out.println("send screen " + ix++);
break;
}
}
} catch (UnknownHostException e) {
System.err.println("Don't know about host");
System.exit(1);
} catch (IOException e) {
System.err.println("Couldn't get I/O for the connection " + e.getMessage());
System.exit(1);
} catch (Exception e) {
e.printStackTrace();
System.exit(1);
}
}
服务器：
public class ServerWorker implements Runnable {
private Socket socket = null;
DataInputStream in = null;
DataOutputStream out = null;
ServerWorker() {
}
synchronized void setSocket(Socket socket) {
this.socket = socket;
try {
in = new DataInputStream(socket.getInputStream());
out = new DataOutputStream(socket.getOutputStream());
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
notify();
}
public synchronized void run() {
int ix = 0;
try {
while (true) {
out.writeInt(Var.READY);
int nbrToRead = in.readInt();
byte[] byteArray = new byte[nbrToRead];
int nbrRd = 0;
int nbrLeftToRead = nbrToRead;
while(nbrLeftToRead > 0){
int rd =in.read(byteArray, nbrRd, nbrLeftToRead);
if(rd < 0)
break;
nbrRd += rd; // accumulate bytes read
nbrLeftToRead -= rd;
}
//Converting the image
ByteArrayInputStream byteArrayI = new ByteArrayInputStream(byteArray);
BufferedImage image = ImageIO.read(byteArrayI);
System.out.println("received screen " + ix++);
//image.flush();
File of = new File("RecvdImg" + ix + ".jpg");
ImageIO.write(image, "PNG" ,of);
System.out.println("Sleeping 1..");
Thread.sleep(1000);
}
} catch (Exception e) {
e.printStackTrace();
Thread.currentThread().interrupt();
}
}
}
那么你可能会问什么问题？好吧，我做得对吗？活动监视器告诉我客户端不断占用大约 40% 的 cpu，这不是很好。
只是想知道是否有人能指出我正确的方向来提高代码的效率。