java中 textArea这个类设计的界面不能编辑 我用java中的这个类textArea,设计了一个界面,但这个文本区域不能编辑,只能复制、粘贴、打印中文,英文不能打印,也不能删除,请问这是怎么回事? 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 TextArea ta=......;ta.setEditable(false); 这是全部的代码package cn.itcast.day_20;import java.awt.BorderLayout;import java.awt.Button;import java.awt.Color;import java.awt.Frame;import java.awt.Panel;import java.awt.TextArea;import java.awt.TextField;import java.awt.event.KeyAdapter;import java.awt.event.KeyEvent;import java.awt.event.MouseAdapter;import java.awt.event.MouseEvent;import java.awt.event.WindowAdapter;import java.awt.event.WindowEvent;import java.io.BufferedWriter;import java.io.ByteArrayOutputStream;import java.io.FileInputStream;import java.io.FileNotFoundException;import java.io.FileWriter;import java.io.IOException;import java.io.Writer;import java.net.DatagramPacket;import java.net.DatagramSocket;import java.net.InetAddress;import java.net.SocketException;import java.text.SimpleDateFormat;import java.util.Date;import java.util.concurrent.locks.Lock;import java.util.concurrent.locks.ReentrantLock;public class GuiChat { private Frame frame = new Frame("GUI聊天室"); //需要的成员变量 private Panel centerPanel = new Panel(); private Panel southPanel = new Panel(); private TextArea centerTextArea = new TextArea(); private TextArea southTextArea = new TextArea(5, 1); //5行1列,但会铺满边界 private TextField textField = new TextField(20); private Button sendButton = new Button("发送"); private Button clearButton = new Button("清空"); private Button logButton = new Button("聊天记录"); private Button shakeButton = new Button("震屏"); private DatagramSocket socket; private Lock lock = new ReentrantLock(); private Writer writer; public GuiChat(){ //事件方法 inti(); generateGUI(); handleEvent(); new newThread().start(); } private void inti() { //抛异常对象 try { socket = new DatagramSocket(); writer = new BufferedWriter(new FileWriter("log.txt", true)); } catch (IOException e) { throw new RuntimeException(); } } private void handleEvent() { //窗口监听器 frame.addWindowListener(new WindowAdapter(){ @Override public void windowClosing(WindowEvent e) { try { writer.close(); socket.close(); System.exit(0); } catch (IOException e1) { // TODO Auto-generated catch block e1.printStackTrace(); } } }); //发送按钮监听器 sendButton.addMouseListener(new MouseAdapter(){ @Override public void mousePressed(MouseEvent e) { send(); } }); //南边区域监听器 southTextArea.addKeyListener(new KeyAdapter(){ @Override public void keyPressed(KeyEvent e) if(e.getKeyCode() == KeyEvent.VK_ENTER && e.isControlDown()){ send(); e.consume(); // 把指针定位在第一行 } }); //清空监听器 clearButton.addMouseListener(new MouseAdapter(){ @Override public void mousePressed(MouseEvent e) { centerTextArea.setText(""); } }); //日志监听器 logButton.addMouseListener(new MouseAdapter(){ @Override public void mousePressed(MouseEvent e) { showLog(); } }); //震动监听器 shakeButton.addMouseListener(new MouseAdapter(){ @Override public void mousePressed(MouseEvent e) { sendShake(); } }); } //设计震屏,但震屏不能出现在发送的内容中,这就选一个特殊的数字代替 private void sendShake() { sendDate(textField.getText(), new byte[]{-1}); } //聊天记录方法 private void showLog(){ try { writer.flush(); FileInputStream fis = new FileInputStream("log.txt"); ByteArrayOutputStream baos = new ByteArrayOutputStream(); byte[] buffer = new byte[1024]; int len; while ((len = fis.read(buffer)) != -1) { baos.write(buffer, 0, len); } fis.close(); baos.close(); String content = new String(baos.toByteArray()); centerTextArea.setText(content); } catch (Exception e) { // TODO: handle exception } } //发送消息方法 private void send() { String message = southTextArea.getText(); String ip = textField.getText(); ip = "".equals(ip) ? "255.255.255.255" : ip; if(message.length() == 0) return; String regexPart = "((\\d)|(\\d{2})|([01]\\d{2})|(2[0-4]\\d)|(25[0-5]))"; String isRegex = regexPart + "\\." + regexPart + "\\." + regexPart + "\\." +regexPart; if(!ip.matches(isRegex)) return; lock.lock(); try { sendDate(ip, message.getBytes()); //定义一个发送数据的方法 //这里有可能会出错误,当数据还没有打印出来,而接收到的数据就显示出来了,就要使用同步 String time = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(new Date()); String content = time + " 我对 " + ip + " 说: " + "\r\n" + message + "\r\n\r\n"; centerTextArea.append(content); writer.write(content); southTextArea.setText(""); } catch (Exception e) { throw new RuntimeException(); }finally{ lock.unlock(); } } //发送消息数据方法 private void sendDate(String ip, byte[] bytes){ try { DatagramPacket packet = new DatagramPacket(bytes, bytes.length, InetAddress.getByName(ip), 9999); socket.send(packet); } catch (IOException e) { throw new RuntimeException(e); } } //创建新的线程用来接收消息 class newThread extends Thread{ @Override public void run() { try { // 使用UDP协议接收数据 DatagramSocket socket = new DatagramSocket(9999); DatagramPacket packet = new DatagramPacket(new byte[1024 * (1024)], 1024 * 1024); while (true) { socket.receive(packet); if(packet.getLength() == 1 && packet.getData()[0] == -1){ doShake(); continue; } String ip = packet.getAddress().getHostName(); //??? String message = new String(packet.getData(), 0, packet.getLength()); String time = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(new Date()); String content = time + ip + " 对我说: " + "\r\n" + message + "\r\n\r\n"; lock.lock(); try{ centerTextArea.append(content); //显示在centerTextArea上 writer.write(content); }finally{ lock.unlock(); } } } catch (Exception e) { e.getStackTrace(); } } } //震屏方法 public void doShake() { int x = frame.getLocation().x; int y = frame.getLocation().y; // frame.toFront(); // 有可能无效 // frame.setVisible(true); try { frame.setLocation(x - 20, y - 20); Thread.sleep(20); frame.setLocation(x + 20, y - 0); Thread.sleep(20); frame.setLocation(x + 20, y + 20); Thread.sleep(20); frame.setLocation(x - 20, y + 20); frame.setLocation(x - 20, y - 20); Thread.sleep(20); frame.setLocation(x + 20, y - 0); Thread.sleep(20); frame.setLocation(x + 20, y + 20); Thread.sleep(20); frame.setLocation(x - 20, y + 20); Thread.sleep(20); frame.setLocation(x, y); } catch (InterruptedException e) { // TODO Auto-generated catch block e.printStackTrace(); } } //图形界面方法 private void generateGUI() { //设置frame frame.setSize(400, 600); frame.setLocation(450,50); frame.setResizable(false); //设计中间的Panel frame.add(centerPanel, BorderLayout.CENTER); centerPanel.setLayout(new BorderLayout()); centerPanel.add(centerTextArea,BorderLayout.CENTER); centerPanel.add(southTextArea, BorderLayout.SOUTH); southTextArea.setEditable(true); centerTextArea.setEditable(false); centerTextArea.setBackground(Color.WHITE); //设计南边的Panel frame.add(southPanel, BorderLayout.SOUTH); southPanel.add(textField); southPanel.add(sendButton); southPanel.add(clearButton); southPanel.add(logButton); southPanel.add(shakeButton); textField.setText("192.168.1.126"); frame.setVisible(true); } //创建对象,自动调用构造函数 public static void main(String[] args) { new GuiChat(); }} southTextArea.setEditable(true); centerTextArea.setEditable(false); centerTextArea.setBackground(Color.WHITE);其中的“centerTextArea.setEditable(false);”中的“false”改“true”! 一个关于JAVA正则表达式的小问题 jdbc connection自动提交的问题 一个查询异常的问题,请大家多多帮忙!~ 关于不连数据库的登录 跪求Java日文式样!(半个月左右能做完的实习项目!!) 为什么会有这样的结果??谢谢!!! 在TextField内的字符怎么换行???( 高分求文件下载,文件类型最好是普通类型都可以,明晚揭贴 java小程序调试,马上给分 下午考试JAVA,SCJP形式,全英文(变X),玩完了,惨了,痛苦,无处发泄,散分。。 对于java的类里面的public方法,这方法里面的变量或者变量好像都不能用权限修饰,为什么呢? java 树怎么弄
import java.awt.Button;
import java.awt.Color;
import java.awt.Frame;
import java.awt.Panel;
import java.awt.TextArea;
import java.awt.TextField;
import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.io.BufferedWriter;
import java.io.ByteArrayOutputStream;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileWriter;
import java.io.IOException;
import java.io.Writer;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetAddress;
import java.net.SocketException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;public class GuiChat {
private Frame frame = new Frame("GUI聊天室"); //需要的成员变量
private Panel centerPanel = new Panel();
private Panel southPanel = new Panel();
private TextArea centerTextArea = new TextArea();
private TextArea southTextArea = new TextArea(5, 1); //5行1列,但会铺满边界
private TextField textField = new TextField(20);
private Button sendButton = new Button("发送");
private Button clearButton = new Button("清空");
private Button logButton = new Button("聊天记录");
private Button shakeButton = new Button("震屏");
private DatagramSocket socket;
private Lock lock = new ReentrantLock();
private Writer writer;
public GuiChat(){ //事件方法
inti();
generateGUI();
handleEvent();
new newThread().start();
} private void inti() { //抛异常对象
try {
socket = new DatagramSocket();
writer = new BufferedWriter(new FileWriter("log.txt", true));
} catch (IOException e) {
throw new RuntimeException();
}
} private void handleEvent() {
//窗口监听器
frame.addWindowListener(new WindowAdapter(){ @Override
public void windowClosing(WindowEvent e) {
try {
writer.close();
socket.close();
System.exit(0);
} catch (IOException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
}
});
//发送按钮监听器
sendButton.addMouseListener(new MouseAdapter(){ @Override
public void mousePressed(MouseEvent e) {
send();
}
});
//南边区域监听器
southTextArea.addKeyListener(new KeyAdapter(){ @Override
public void keyPressed(KeyEvent e)
if(e.getKeyCode() == KeyEvent.VK_ENTER && e.isControlDown()){
send();
e.consume(); // 把指针定位在第一行
}
});
//清空监听器
clearButton.addMouseListener(new MouseAdapter(){ @Override
public void mousePressed(MouseEvent e) {
centerTextArea.setText("");
}
});
//日志监听器
logButton.addMouseListener(new MouseAdapter(){ @Override
public void mousePressed(MouseEvent e) {
showLog();
}
});
//震动监听器
shakeButton.addMouseListener(new MouseAdapter(){ @Override
public void mousePressed(MouseEvent e) {
sendShake();
}
});
}
//设计震屏,但震屏不能出现在发送的内容中,这就选一个特殊的数字代替
private void sendShake() {
sendDate(textField.getText(), new byte[]{-1});
}
//聊天记录方法
private void showLog(){
try {
writer.flush();
FileInputStream fis = new FileInputStream("log.txt");
ByteArrayOutputStream baos = new ByteArrayOutputStream();
byte[] buffer = new byte[1024];
int len;
while ((len = fis.read(buffer)) != -1) {
baos.write(buffer, 0, len);
}
fis.close();
baos.close();
String content = new String(baos.toByteArray());
centerTextArea.setText(content);
} catch (Exception e) {
// TODO: handle exception
}
}
//发送消息方法
private void send() {
String message = southTextArea.getText();
String ip = textField.getText();
ip = "".equals(ip) ? "255.255.255.255" : ip;
if(message.length() == 0)
return;
String regexPart = "((\\d)|(\\d{2})|([01]\\d{2})|(2[0-4]\\d)|(25[0-5]))";
String isRegex = regexPart + "\\." + regexPart + "\\." + regexPart + "\\." +regexPart;
if(!ip.matches(isRegex))
return;
lock.lock();
try {
sendDate(ip, message.getBytes()); //定义一个发送数据的方法
//这里有可能会出错误,当数据还没有打印出来,而接收到的数据就显示出来了,就要使用同步
String time = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(new Date());
String content = time + " 我对 " + ip + " 说: " + "\r\n" + message + "\r\n\r\n";
centerTextArea.append(content);
writer.write(content);
southTextArea.setText("");
} catch (Exception e) {
throw new RuntimeException();
}finally{
lock.unlock();
}
}
//发送消息数据方法
private void sendDate(String ip, byte[] bytes){
try {
DatagramPacket packet = new DatagramPacket(bytes, bytes.length, InetAddress.getByName(ip), 9999);
socket.send(packet);
} catch (IOException e) {
throw new RuntimeException(e);
}
}
//创建新的线程用来接收消息
class newThread extends Thread{ @Override
public void run() {
try {
// 使用UDP协议接收数据
DatagramSocket socket = new DatagramSocket(9999);
DatagramPacket packet = new DatagramPacket(new byte[1024 * (1024)], 1024 * 1024);
while (true) {
socket.receive(packet);
if(packet.getLength() == 1 && packet.getData()[0] == -1){
doShake();
continue;
}
String ip = packet.getAddress().getHostName(); //???
String message = new String(packet.getData(), 0, packet.getLength());
String time = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(new Date());
String content = time + ip + " 对我说: " + "\r\n" + message + "\r\n\r\n";
lock.lock();
try{
centerTextArea.append(content); //显示在centerTextArea上
writer.write(content);
}finally{
lock.unlock();
}
}
} catch (Exception e) {
e.getStackTrace();
}
}
}
//震屏方法
public void doShake() {
int x = frame.getLocation().x;
int y = frame.getLocation().y;
// frame.toFront(); // 有可能无效
// frame.setVisible(true);
try {
frame.setLocation(x - 20, y - 20);
Thread.sleep(20);
frame.setLocation(x + 20, y - 0);
Thread.sleep(20);
frame.setLocation(x + 20, y + 20);
Thread.sleep(20);
frame.setLocation(x - 20, y + 20);
frame.setLocation(x - 20, y - 20);
Thread.sleep(20);
frame.setLocation(x + 20, y - 0);
Thread.sleep(20);
frame.setLocation(x + 20, y + 20);
Thread.sleep(20);
frame.setLocation(x - 20, y + 20);
Thread.sleep(20);
frame.setLocation(x, y);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
//图形界面方法
private void generateGUI() {
//设置frame
frame.setSize(400, 600);
frame.setLocation(450,50);
frame.setResizable(false);
//设计中间的Panel
frame.add(centerPanel, BorderLayout.CENTER);
centerPanel.setLayout(new BorderLayout());
centerPanel.add(centerTextArea,BorderLayout.CENTER);
centerPanel.add(southTextArea, BorderLayout.SOUTH);
southTextArea.setEditable(true);
centerTextArea.setEditable(false);
centerTextArea.setBackground(Color.WHITE);
//设计南边的Panel
frame.add(southPanel, BorderLayout.SOUTH);
southPanel.add(textField);
southPanel.add(sendButton);
southPanel.add(clearButton);
southPanel.add(logButton);
southPanel.add(shakeButton);
textField.setText("192.168.1.126");
frame.setVisible(true);
}
//创建对象,自动调用构造函数
public static void main(String[] args) {
new GuiChat();
}}
centerTextArea.setEditable(false);
centerTextArea.setBackground(Color.WHITE);
其中的“centerTextArea.setEditable(false);”中的“false”改“true”!