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我正在使用以下代码从Android客户端读取一些数据。一切都很好。但是现在我被要求让这个服务器代码不被阻塞。有什么建议吗?我试图使用线程,但不知道如何?我是初学者在Java中:)Java服务器非阻塞查询
感谢
import java.awt.image.BufferedImage;
import java.io.BufferedOutputStream;
import java.io.ByteArrayInputStream;
import java.io.DataInputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.ServerSocket;
import java.net.Socket;
import java.util.Calendar;
import java.util.Date;
import javax.imageio.ImageIO;
public class Server {
//Server Constructor
public Server()
{}
//Variables Initialization
private static ServerSocket server;
byte[] imagetemp;
private static Socket socket1;
private static boolean newImage;
private static Sdfdata data;
private static boolean cond;
public static int port;
private static int number = 0;
//Image Availability return method
public boolean imageAvailable()
{
return newImage;
}
public boolean clientchk()
{
return socket1.isClosed();
}
//Image Flag set by Vis group when image read.
public void setImageFlag(boolean set)
{
newImage = set;
}
// Send the data to the Vis Group
public Sdfdata getData()
{
return data;
}
//Starts the Server
public static boolean start(int port1)
{
try {
port=port1;
server = new ServerSocket(port1);
System.out.println("Waiting for Client to Connect");
//New thread here
socket1=server.accept();
} catch (IOException e) {
System.out.println("Cannot Connect");
e.printStackTrace();
return false;
}
return true;
}
//Stops the Server
public boolean stop()
{
try {
socket1.close();
}
catch (IOException e)
{
e.printStackTrace();
return false;
}
return true;
}
/**
* @param args
* @throws IOException
*/
public static void main(String[] args) throws IOException {
// Starts the server
start(4444);
// DataInput Stream for reading the data
DataInputStream in = null;
try {
in = new DataInputStream(socket1.getInputStream());
} catch (IOException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
cond=true;
do {
try
{
//Read Image Data
int length = in.readInt();
//Create an ByteArray of length read from Client for Image transfer
Sdfdata data = new Sdfdata(length);
//for (int i=0; i<length; i++)
//{ data.image[i] = in.readbyte(); }
if (length > 0) {
in.readFully(data.image);
}
//Read Orientation
data.orientation[0] = in.readFloat(); //Orientation x
data.orientation[1] = in.readFloat(); //Orientation y
data.orientation[2] = in.readFloat(); //Orientation z
//Read GPS
data.longitude = in.readDouble();
data.latitude = in.readDouble();
data.altitude = in.readDouble();
//Display orientation and GPS data
System.out.println(data.orientation[0] + " " + data.orientation[1] + " " + data.orientation[2]);
System.out.println(data.longitude + " " + data.latitude + " " + data.altitude);
String fileName = "IMG_" + Integer.toString(++number) + ".JPG";
System.out.println("FileName: " + fileName);
FileOutputStream fos = new FileOutputStream(fileName);
fos.write(data.image);
fos.close();
/*InputStream ins = new ByteArrayInputStream(data.image);
BufferedImage image = ImageIO.read(ins);
ImageIO.write(image, "JPG", new File (fileName));
*/
//set image flag
newImage = true;
} catch (Exception e) {
//System.out.println("EOF Or ? " + e);
cond =false;
socket1.close();
server.close();
start(port);
}
}while (cond);
}
}
感谢高山。不,我不会向我们询问异步IO。我只是被要求启动一个应该监听套接字而不是这个套接字监听的线程。它将只有一个线程,并有助于最大限度地减少CPU使用率等。如果我以正确的方式。 – 2012-02-29 00:20:45