我遇到了套接字的一些问题。
我正在尝试使并发服务器接受多个客户端。
当客户端连接到服务器时，服务器会创建一个新线程并侦听套接字。 然后，如果客户端发送了什么，服务器必须读取它。
在客户端我只是打开一个字典（txt表单），我通过套接字发送它。
在服务器上我唯一得到的是：
＃空
SERVER
try
{
String message,file = new String("StressTextFile.txt");
File filee = new File(file);
long length;
// Open the file
FileInputStream fstream = new FileInputStream(file);
// Get the object of DataInputStream
DataInputStream in = new DataInputStream(fstream);
BufferedReader br = new BufferedReader(new InputStreamReader(in));
String strLine = new String();
length = filee.length();
ProgressBar.setMaximum((int)length); //we're going to get this many bytes
ProgressBar.setValue(0); //we've gotten 0 bytes so far
//Read File Line By Line
font1 = new Font("Helvetica", Font.PLAIN, 18);
font1.isBold();
color = new Color( 74,118,110);
TextArea1.setForeground(color);
TextArea1.setFont(font1);
int soma=0;
while(in.readLine() != null)
{
strLine = in.readLine(); // reads from file
//System.out.println(strLine);
TextArea1.append(strLine+"\n");
pwOut.write(strLine);
pwOut.flush();
soma+=strLine.length()+1;
ProgressBar.setValue(ProgressBar.getValue()+(strLine.length()+1)*2);
ProgressBar.repaint();
};
br.close();
pwOut.close();
Skt.close();
}catch (Exception e){ System.err.println("Error: " + e.getMessage()); }
}
客户
try
{
brIn = new BufferedReader(new InputStreamReader(skt.getInputStream()));
while(s != null)
{
s = brIn.readLine();
System.out.println("#####");
System.out.println(s);
}
}
catch (IOException e1) {e1.printStackTrace(); }
请忘记Swing组件。 我认为所有套接字的东西都可以。为什么我不能在服务器端得到任何东西？
请帮忙
亲切的问候
答案 0 :(得分：4)
多线程服务器的准系统示例：
//MyServer.java
public class MyServer {
private static int PORT = 12345;
public static void main(String args[]) {
ServerSocket s = new ServerSocket(PORT);
while(true) new MyServerThread(s.accept());
}
您的服务器主题：
//MyServerThread.java
public class MyServerThread implements Runnable {
private InputStream in = null;
private OutputStream out = null;
public MyServerThread(Socket s) {
in = s.getInputStream();
out = s.getOutputStream();
(new Thread(this)).start();
}
public void run() {
//do stuff with **in** and **out** to interact with client
}
}
缺少此示例：
close()套接字/流希望能让您了解它的外观。
答案 1 :(得分：0)
好的，所以服务器是这样的：
公共类KnockKnockServer { public static void main（String [] args）抛出IOException {
ServerSocket serverSocket = null;
RunnableThread rt;
try { serverSocket = new ServerSocket(4443);}
catch (IOException e)
{
System.err.println("Could not listen on port: 4443.");
System.exit(1);
}
Socket clientSocket = null;
try
{
clientSocket = serverSocket.accept();
rt = new RunnableThread("t1",clientSocket);
}
catch (IOException e)
{
System.err.println("Accept failed.");
System.exit(1);
}
serverSocket.close();
}
}
class RunnableThread implements Runnable
{
Thread runner;
Socket skt;
public RunnableThread(String threadName,Socket cliSock)
{
runner = new Thread(this, threadName); // (1) Create a new thread.
skt = cliSock;
runner.run();
}
@SuppressWarnings("deprecation")
public void run()
{
//Display info about this particular thread
//System.out.println(Thread.currentThread());
//PrintWriter out = new PrintWriter(skt.getOutputStream(), true);
BufferedReader brIn;
String s = new String();
try
{
brIn = new BufferedReader(new InputStreamReader(skt.getInputStream()));
while(s != null)
{
s = brIn.readLine();
System.out.println("#####");
System.out.println(s);
}
}
catch (IOException e1) {e1.printStackTrace(); }
}
}
在客户端中，唯一与服务器交互的是当我从字典文件（StressTextFile.txt）中读取单词并通过Socket发送它时：
public void SendToServer()
{
new Thread()
{
public void run()
{
try
{
String message,file = new String("StressTextFile.txt");
File filee = new File(file);
long length;
// Open the file
FileInputStream fstream = new FileInputStream(file);
// Get the object of DataInputStream
DataInputStream in = new DataInputStream(fstream);
BufferedReader br = new BufferedReader(new InputStreamReader(in));
String strLine = new String();
length = filee.length();
ProgressBar.setMaximum((int)length); //we're going to get this many bytes
ProgressBar.setValue(0); //we've gotten 0 bytes so far
//Read File Line By Line
font1 = new Font("Helvetica", Font.PLAIN, 18);
font1.isBold();
color = new Color( 74,118,110);
TextArea1.setForeground(color);
TextArea1.setFont(font1);
int soma=0;
while(in.readLine() != null)
{
strLine = in.readLine(); // reads from file
//System.out.println(strLine);
TextArea1.append(strLine+"\n");
pwOut.write(strLine);
pwOut.flush();
soma+=strLine.length()+1;
ProgressBar.setValue(ProgressBar.getValue()+(strLine.length()+1)*2);
ProgressBar.repaint();
};
br.close();
pwOut.close();
Skt.close();
}catch (Exception e){ System.err.println("Error: " + e.getMessage()); }
}
}.start();
}
FOR DOCUMENTATION：
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Font;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.AdjustmentEvent;
import java.awt.event.AdjustmentListener;
import java.io.BufferedReader;
import java.io.DataInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.Socket;
import java.net.UnknownHostException;
import java.util.Scanner;
import javax.swing.*;
import javax.swing.border.Border;
public class Graphics extends JFrame implements ActionListener
{
private JPanel Panel;
public JLabel LabelConnect;
public JLabel DataSent;
public JLabel DataReceived;
private JTextField TextFieldOutPUT;
private JButton ConnectButton;
private JButton Sendinformation;
private int value;
private JTextArea TextArea1;
private JTextArea TextArea2;
private JProgressBar ProgressBar;
private Socket Skt;
private PrintWriter pwOut;
private boolean CONNECTED;
private Border border;
private Color color;
private Font font1;
private JScrollPane ScrollBar1;
private JScrollPane ScrollBar2;
public Graphics() throws UnknownHostException, IOException
{
value = 0;
Panel = new JPanel();
font1 = new Font("Helvetica", Font.PLAIN, 15);
font1.isBold();
LabelConnect = new JLabel();
DataReceived = new JLabel();
DataSent = new JLabel();
TextFieldOutPUT = new JTextField();
ConnectButton = new JButton("Connect");
TextArea1 = new JTextArea("ola");
TextArea2 = new JTextArea("Adeus");
Sendinformation = new JButton("Send");
ProgressBar = new JProgressBar();
Sendinformation.setLayout(null);
Sendinformation.setBounds(340, 450, 100, 25);
Sendinformation.setVisible(true);
Sendinformation.addActionListener(this);
color = new Color( 211,211,211);
TextArea1.setVisible(true);
TextArea1.setLayout(null);
TextArea2.setVisible(true);
TextArea2.setLayout(null);
ScrollBar1 = new JScrollPane(TextArea1);
ScrollBar1.setLayout(null);
ScrollBar1.setVisible(true);
ScrollBar1.setBounds(210,40,15,400);
ScrollBar1.setEnabled(true);
ScrollBar1.setVisible(true);
ScrollBar1.setBackground(color);
ScrollBar1.setBounds(10,40,210,400);
ScrollBar2 = new JScrollPane(TextArea2);
ScrollBar2.setLayout(null);
ScrollBar2.setVisible(true);
ScrollBar2.setEnabled(true);
ScrollBar2.setBackground(color);
ScrollBar2.setBounds(230,40,210,400);
ScrollBar2.setLayout(null);
ScrollBar2.setVisible(true);
border = BorderFactory.createTitledBorder("Reading...");
ProgressBar.setLayout(null);
ProgressBar.setBounds(10,450,320,25);
ProgressBar.setValue(0);
ProgressBar.setStringPainted(true);
//ProgressBar.setBorderPainted(border);
ProgressBar.setVisible(true);
TextFieldOutPUT.setVisible(true);
TextFieldOutPUT.setBounds(10,500,320,25);
ConnectButton.addActionListener(this);
ConnectButton.setLayout(null);
ConnectButton.setVisible(true);
ConnectButton.setBounds(340, 500, 100, 25);
LabelConnect.setBounds(10,478,320,25);
LabelConnect.setVisible(true);
LabelConnect.setFont(font1);
LabelConnect.setForeground(Color.WHITE);
LabelConnect.setText("Connect");
font1 = new Font("Helvetica", Font.PLAIN, 18);
DataReceived.setBounds(235,10,200,25);
DataReceived.setVisible(true);
DataReceived.setFont(font1);
DataReceived.setForeground(Color.WHITE);
DataReceived.setText("Data Received");
DataSent.setBounds(15,10,200,25);
DataSent.setVisible(true);
DataSent.setFont(font1);
DataSent.setForeground(Color.WHITE);
DataSent.setText("Data Sent");
color = new Color(108,166,205);
Panel.setBackground(color);
Panel.add(ScrollBar1);
Panel.add(ScrollBar2);
Panel.add(DataSent);
Panel.add(DataReceived);
Panel.add(Sendinformation);
Panel.add(ProgressBar);
Panel.add(ConnectButton);
Panel.add(TextFieldOutPUT);
Panel.add(LabelConnect);
Panel.setVisible(true);
Panel.setLayout(null);
Panel.setBounds(500,400,800,600);
add(Panel);
this.setSize(459,560 );
setVisible(true);
}
@Override
public void actionPerformed(ActionEvent e)
{
//Object obj = new obj(e.get)
if(e.getSource() == ConnectButton)
{
if(!CONNECTED)
{
String s = new String(TextFieldOutPUT.getText());
try {Skt = new Socket(s, 4443); Skt.close();
} catch (UnknownHostException e2) {e2.printStackTrace(); JOptionPane.showMessageDialog(Panel, "Connection could not be established!!"); return;
} catch (IOException e2) {e2.printStackTrace(); JOptionPane.showMessageDialog(Panel, "Connection could not be established!!");return;}
System.out.println(s);
try {ConnectCLIENT(s);
} catch (UnknownHostException e1) {e1.printStackTrace();
} catch (IOException e1) {e1.printStackTrace();}
}
else
{
try { Skt.close(); } catch (IOException e1){ e1.printStackTrace(); }
ConnectButton.setText("Connect");
TextFieldOutPUT.setEditable(true);
CONNECTED = false;
Panel.repaint();
}
}
if(e.getSource() == Sendinformation){
System.out.print("Sendinformation");
if(CONNECTED)
SendToServer();
else
JOptionPane.showMessageDialog(Panel, "You are not connecte to the server!! Please connect!!");
}
}
public void ConnectCLIENT(String socketStr) throws UnknownHostException, IOException
{
try{
Skt = new Socket(socketStr, 4443);
pwOut = new PrintWriter(Skt.getOutputStream(),true);
System.out.print("Connected");
TextFieldOutPUT.setEditable(false);
ConnectButton.setText("Disconnect");
CONNECTED = true;
JOptionPane.showMessageDialog(Panel, "Connection Sucessfully established!!");
Panel.repaint();
}
catch(Exception E){E.printStackTrace();}
}
public void SendToServer()
{
new Thread()
{
public void run()
{
try
{
String message,file = new String("StressTextFile.txt");
File filee = new File(file);
long length;
// Open the file
FileInputStream fstream = new FileInputStream(file);
// Get the object of DataInputStream
DataInputStream in = new DataInputStream(fstream);
BufferedReader br = new BufferedReader(new InputStreamReader(in));
String strLine = new String();
length = filee.length();
ProgressBar.setMaximum((int)length); //we're going to get this many bytes
ProgressBar.setValue(0); //we've gotten 0 bytes so far
//Read File Line By Line
font1 = new Font("Helvetica", Font.PLAIN, 18);
font1.isBold();
color = new Color( 74,118,110);
TextArea1.setForeground(color);
TextArea1.setFont(font1);
int soma=0;
while(in.readLine() != null)
{
strLine = in.readLine(); // reads from file
//System.out.println(strLine);
TextArea1.append(strLine+"\n");
pwOut.write(strLine);
pwOut.flush();
soma+=strLine.length()+1;
ProgressBar.setValue(ProgressBar.getValue()+(strLine.length()+1)*2);
ProgressBar.repaint();
};
br.close();
pwOut.close();
Skt.close();
}catch (Exception e){ System.err.println("Error: " + e.getMessage()); }
}
}.start();
}
}