一个输入字符串不覆盖前字符串的问题 准备写个聊天程序 有个问题不知道如何解决就是现在如果我从输入框输入一些字符然后按回车后显示到显示框中但当我第二次输入字符时按回车这时就会把第一次的字符覆盖掉有没什么办法能让第二次输入的换行不要覆盖掉前一次的输入 解决方案 » 免费领取超大流量手机卡,每月29元包185G流量+100分钟通话, 中国电信官方发货 //ChatClient.javaimport java.awt.*;import java.awt.event.*;import java.io.*;import java.net.*;public class ChatClient extends Frame { Socket s = null; DataOutputStream dos = null; DataInputStream dis = null; private boolean bConnected = false; TextField tfTxt = new TextField(); TextArea taContent = new TextArea(); Thread tRecv = new Thread(new RecvThread()); public static void main(String[] args) { new ChatClient().launchFrame(); } public void launchFrame() { setLocation(400, 300); this.setSize(300, 300); add(tfTxt, BorderLayout.SOUTH); add(taContent, BorderLayout.NORTH); pack(); this.addWindowListener(new WindowAdapter() { @Override public void windowClosing(WindowEvent arg0) { disconnect(); System.exit(0); } }); tfTxt.addActionListener(new TFListener()); setVisible(true); connect(); tRecv.start(); } public void connect() { try { s = new Socket("127.0.0.1", 8888); dos = new DataOutputStream(s.getOutputStream()); dis = new DataInputStream(s.getInputStream());System.out.println("connected!"); bConnected = true; } catch (UnknownHostException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } } public void disconnect() { try { dos.close(); dis.close(); s.close(); } catch (IOException e) { e.printStackTrace(); } /* try { bConnected = false; tRecv.join(); } catch(InterruptedException e) { e.printStackTrace(); } finally { try { dos.close(); dis.close(); s.close(); } catch (IOException e) { e.printStackTrace(); } } */ } private class TFListener implements ActionListener { public void actionPerformed(ActionEvent e) { String str = tfTxt.getText().trim(); //taContent.setText(str); tfTxt.setText(""); try {//System.out.println(s); dos.writeUTF(str); dos.flush(); //dos.close(); } catch (IOException e1) { e1.printStackTrace(); } } } private class RecvThread implements Runnable { public void run() { try { while(bConnected) { String str = dis.readUTF(); //System.out.println(str); taContent.setText(taContent.getText() + str + '\n'); } } catch (SocketException e) { System.out.println("退出了,bye!"); } catch (EOFException e) { System.out.println("推出了,bye - bye!"); } catch (IOException e) { e.printStackTrace(); } } }}//ChatServer.javaimport java.io.*;import java.net.*;import java.util.*;public class ChatServer { boolean started = false; ServerSocket ss = null; List<Client> clients = new ArrayList<Client>(); public static void main(String[] args) { new ChatServer().start(); } public void start() { try { ss = new ServerSocket(8888); started = true; } catch (BindException e) { System.out.println("端口使用中...."); System.out.println("请关掉相关程序并重新运行服务器!"); System.exit(0); } catch (IOException e) { e.printStackTrace(); } try { while(started) { Socket s = ss.accept(); Client c = new Client(s);System.out.println("a client connected!"); new Thread(c).start(); clients.add(c); //dis.close(); } } catch (IOException e) { e.printStackTrace(); } finally { try { ss.close(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } } } class Client implements Runnable { private Socket s; private DataInputStream dis = null; private DataOutputStream dos = null; private boolean bConnected = false; public Client(Socket s) { this.s = s; try { dis = new DataInputStream(s.getInputStream()); dos = new DataOutputStream(s.getOutputStream()); bConnected = true; } catch (IOException e) { e.printStackTrace(); } } public void send(String str) { try { dos.writeUTF(str); } catch (IOException e) { clients.remove(this); System.out.println("对方退出了!我从List里面去掉了!"); //e.printStackTrace(); } } public void run() { try { while(bConnected) { String str = dis.readUTF();System.out.println(str); for(int i=0; i<clients.size(); i++) { Client c = clients.get(i); c.send(str);//System.out.println(" a string send !"); } /* for(Iterator<Client> it = clients.iterator(); it.hasNext(); ) { Client c = it.next(); c.send(str); } */ /* Iterator<Client> it = clients.iterator(); while(it.hasNext()) { Client c = it.next(); c.send(str); } */ } } catch (EOFException e) { System.out.println("Client closed!"); } catch (IOException e) { e.printStackTrace(); } finally { try { if(dis != null) dis.close(); if(dos != null) dos.close(); if(s != null) { s.close(); //s = null; } } catch (IOException e1) { e1.printStackTrace(); } } } }} if (text1.getText().equals("")) { text1.setText(getstr);}else { text1.setText(text1.getText() + "\n" + getstr);} private JTextArea messages=new JTextArea();;messages.append("这样就可以了 "); 使用stringbuffer的append方法即可 java 中“焦点”的问题!熟悉swing的进! 无法从套接字读取更多的数据 有没有在java里用类来封装JDBC访问数据库的例子,大家贡献一个看看? 用反射反映类的功能中的疑点问题(小弟初学者,望高手指教) 十分着急...... graphics对象为空? 头疼了,执行MYSQL语句,出现了莫名的错误!!! JB使用一问 怪事情,怪事情,真怪..........高手进来看一下 如何在运行时分析出存储过程的参数类型? 问一个幼稚问题 请问this.getServletConfig()中的this是指什么啊? 关于static加载的问题
//ChatClient.java
import java.awt.*;
import java.awt.event.*;
import java.io.*;
import java.net.*;public class ChatClient extends Frame {
Socket s = null;
DataOutputStream dos = null;
DataInputStream dis = null;
private boolean bConnected = false; TextField tfTxt = new TextField(); TextArea taContent = new TextArea();
Thread tRecv = new Thread(new RecvThread()); public static void main(String[] args) {
new ChatClient().launchFrame();
} public void launchFrame() {
setLocation(400, 300);
this.setSize(300, 300);
add(tfTxt, BorderLayout.SOUTH);
add(taContent, BorderLayout.NORTH);
pack();
this.addWindowListener(new WindowAdapter() { @Override
public void windowClosing(WindowEvent arg0) {
disconnect();
System.exit(0);
}
});
tfTxt.addActionListener(new TFListener());
setVisible(true);
connect();
tRecv.start();
}
public void connect() {
try {
s = new Socket("127.0.0.1", 8888);
dos = new DataOutputStream(s.getOutputStream());
dis = new DataInputStream(s.getInputStream());
System.out.println("connected!");
bConnected = true;
} catch (UnknownHostException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
public void disconnect() {
try {
dos.close();
dis.close();
s.close();
} catch (IOException e) {
e.printStackTrace();
}
/*
try {
bConnected = false;
tRecv.join();
} catch(InterruptedException e) {
e.printStackTrace();
} finally {
try {
dos.close();
dis.close();
s.close();
} catch (IOException e) {
e.printStackTrace();
}
}
*/
}
private class TFListener implements ActionListener { public void actionPerformed(ActionEvent e) {
String str = tfTxt.getText().trim();
//taContent.setText(str);
tfTxt.setText("");
try {
//System.out.println(s);
dos.writeUTF(str);
dos.flush();
//dos.close();
} catch (IOException e1) {
e1.printStackTrace();
}
}
}
private class RecvThread implements Runnable { public void run() {
try {
while(bConnected) {
String str = dis.readUTF();
//System.out.println(str);
taContent.setText(taContent.getText() + str + '\n');
}
} catch (SocketException e) {
System.out.println("退出了,bye!");
} catch (EOFException e) {
System.out.println("推出了,bye - bye!");
} catch (IOException e) {
e.printStackTrace();
}
}
}
}//ChatServer.java
import java.io.*;
import java.net.*;
import java.util.*;public class ChatServer {
boolean started = false;
ServerSocket ss = null;
List<Client> clients = new ArrayList<Client>();
public static void main(String[] args) {
new ChatServer().start();
}
public void start() {
try {
ss = new ServerSocket(8888);
started = true;
} catch (BindException e) {
System.out.println("端口使用中....");
System.out.println("请关掉相关程序并重新运行服务器!");
System.exit(0);
} catch (IOException e) {
e.printStackTrace();
}
try {
while(started) {
Socket s = ss.accept();
Client c = new Client(s);
System.out.println("a client connected!");
new Thread(c).start();
clients.add(c);
//dis.close();
}
} catch (IOException e) {
e.printStackTrace();
} finally {
try {
ss.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
class Client implements Runnable {
private Socket s;
private DataInputStream dis = null;
private DataOutputStream dos = null;
private boolean bConnected = false;
public Client(Socket s) {
this.s = s;
try {
dis = new DataInputStream(s.getInputStream());
dos = new DataOutputStream(s.getOutputStream());
bConnected = true;
} catch (IOException e) {
e.printStackTrace();
}
}
public void send(String str) {
try {
dos.writeUTF(str);
} catch (IOException e) {
clients.remove(this);
System.out.println("对方退出了!我从List里面去掉了!");
//e.printStackTrace();
}
}
public void run() {
try {
while(bConnected) {
String str = dis.readUTF();
System.out.println(str);
for(int i=0; i<clients.size(); i++) {
Client c = clients.get(i);
c.send(str);
//System.out.println(" a string send !");
}
/*
for(Iterator<Client> it = clients.iterator(); it.hasNext(); ) {
Client c = it.next();
c.send(str);
}
*/
/*
Iterator<Client> it = clients.iterator();
while(it.hasNext()) {
Client c = it.next();
c.send(str);
}
*/
}
} catch (EOFException e) {
System.out.println("Client closed!");
} catch (IOException e) {
e.printStackTrace();
} finally {
try {
if(dis != null) dis.close();
if(dos != null) dos.close();
if(s != null) {
s.close();
//s = null;
}
} catch (IOException e1) {
e1.printStackTrace();
}
}
}
}
}
text1.setText(getstr);
}
else {
text1.setText(text1.getText() + "\n" + getstr);
}
messages.append("这样就可以了 ");