[英]Java GUI not appearing after implementing socket methods
我的代碼沒有錯誤。 只要將我創建的start方法中的代碼注釋掉,代碼就可以正常工作。 我不確定為什么會這樣。 我嘗試過移動代碼,但不能解決問題。 為什么啟動方法中的代碼阻止GUI在屏幕上顯示?
package my.IPMessenger;
import java.io.BufferedReader;
import java.io.DataOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.math.BigInteger;
import java.net.InetAddress;
import java.net.ServerSocket;
import java.net.Socket;
import java.net.UnknownHostException;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.swing.JOptionPane;
/**
*
*
*/
public class IPMessengerGUI extends javax.swing.JFrame {
static ServerSocket SC;
static Socket socket;
static BufferedReader in;
static DataOutputStream out;
static char[] c;
static String text;
static String iP;
static Socket sock2;
static BufferedReader in2;
static DataOutputStream out2;
static InetAddress address;
/**
* Creates new form IPMessengerGUI
*/
public IPMessengerGUI() throws IOException {
start();
initComponents();
jTextArea1.setLineWrap(true);
jTextArea2.setLineWrap(true);
// SC = new ServerSocket(6850);
// socket = SC.accept();
// socket.setKeepAlive(true);
// in = new BufferedReader(new InputStreamReader(socket.getInputStream()));
// out = new DataOutputStream(socket.getOutputStream());
// c = new char[1000];
// in2 = new BufferedReader(new InputStreamReader(sock2.getInputStream()));
// out2 = new DataOutputStream(sock2.getOutputStream());
// search();
}
private void start() throws IOException{
SC = new ServerSocket(6850);
socket = SC.accept();
socket.setKeepAlive(true);
in = new BufferedReader(new InputStreamReader(socket.getInputStream()));
out = new DataOutputStream(socket.getOutputStream());
c = new char[1000];
in2 = new BufferedReader(new InputStreamReader(sock2.getInputStream()));
out2 = new DataOutputStream(sock2.getOutputStream());
search();
}
@SuppressWarnings("unchecked")
// <editor-fold defaultstate="collapsed" desc="Generated Code">
private void initComponents() {
jScrollPane2 = new javax.swing.JScrollPane();
jScrollPane1 = new javax.swing.JScrollPane();
jTextArea1 = new javax.swing.JTextArea();
jScrollPane3 = new javax.swing.JScrollPane();
jTextArea2 = new javax.swing.JTextArea();
jLabel1 = new javax.swing.JLabel();
jButton1 = new javax.swing.JButton();
jButton2 = new javax.swing.JButton();
jMenuBar1 = new javax.swing.JMenuBar();
jMenu1 = new javax.swing.JMenu();
jMenu2 = new javax.swing.JMenu();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
jTextArea1.setColumns(20);
jTextArea1.setRows(5);
jScrollPane1.setViewportView(jTextArea1);
jScrollPane2.setViewportView(jScrollPane1);
jTextArea2.setColumns(20);
jTextArea2.setRows(5);
jScrollPane3.setViewportView(jTextArea2);
jLabel1.setText("jLabel1");
jButton1.setText("jButton1");
jButton1.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jButton1ActionPerformed(evt);
}
});
jButton2.setText("jButton2");
jButton2.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jButton2ActionPerformed(evt);
}
});
jMenu1.setText("File");
jMenuBar1.add(jMenu1);
jMenu2.setText("Edit");
jMenuBar1.add(jMenu2);
setJMenuBar(jMenuBar1);
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGap(91, 91, 91)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING, false)
.addComponent(jScrollPane2, javax.swing.GroupLayout.DEFAULT_SIZE, 250, Short.MAX_VALUE)
.addComponent(jScrollPane3))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(jButton1)
.addContainerGap(97, Short.MAX_VALUE))
.addGroup(layout.createSequentialGroup()
.addComponent(jLabel1, javax.swing.GroupLayout.PREFERRED_SIZE, 53, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addComponent(jButton2))
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(jLabel1)
.addComponent(jButton2))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, 38, Short.MAX_VALUE)
.addComponent(jScrollPane3, javax.swing.GroupLayout.PREFERRED_SIZE, 100, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGap(18, 18, 18)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(jScrollPane2, javax.swing.GroupLayout.PREFERRED_SIZE, 100, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(jButton1)))
);
pack();
}// </editor-fold>
private void search() throws IOException{
while(true){
if(in.ready()){
in.read(c);
for(int count = 0; count < c.length ; count++){
text += c[count];
}
jTextArea2.append(text);
}
}
}
private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {
jTextArea2.append(" " + jTextArea1.getText());
try {
out.writeChars(jTextArea1.getText());
} catch (NullPointerException|IOException ex) {
}
jTextArea1.setText(null);
}
private void jButton2ActionPerformed(java.awt.event.ActionEvent evt) {
String ip =( JOptionPane.showInputDialog(null, "please enter a valid IP address:"));
int convert = Integer.parseInt(ip);
byte[] bytes = BigInteger.valueOf(convert).toByteArray();
try {
address = InetAddress.getByAddress(bytes);
} catch (UnknownHostException ex) {
Logger.getLogger(IPMessengerGUI.class.getName()).log(Level.SEVERE, null, ex);
}
try {
sock2 = new Socket(address,6850);
sock2.setKeepAlive(true);
} catch (IOException ex) {
Logger.getLogger(IPMessengerGUI.class.getName()).log(Level.SEVERE, null, ex);
}
}
/**
* @param args the command line arguments
*/
public static void main(String args[]) throws IOException {
/* Set the Nimbus look and feel */
//<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) ">
/* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel.
* For details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html
*/
try {
for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
if ("Nimbus".equals(info.getName())) {
javax.swing.UIManager.setLookAndFeel(info.getClassName());
break;
}
}
} catch (ClassNotFoundException ex) {
java.util.logging.Logger.getLogger(IPMessengerGUI.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (InstantiationException ex) {
java.util.logging.Logger.getLogger(IPMessengerGUI.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (IllegalAccessException ex) {
java.util.logging.Logger.getLogger(IPMessengerGUI.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (javax.swing.UnsupportedLookAndFeelException ex) {
java.util.logging.Logger.getLogger(IPMessengerGUI.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
}
//</editor-fold>
/* Create and display the form */
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
try {
new IPMessengerGUI().setVisible(true);
} catch (IOException ex) {
Logger.getLogger(IPMessengerGUI.class.getName()).log(Level.SEVERE, null, ex);
}
}
});
}
// Variables declaration - do not modify
private javax.swing.JButton jButton1;
private javax.swing.JButton jButton2;
private javax.swing.JLabel jLabel1;
private javax.swing.JMenu jMenu1;
private javax.swing.JMenu jMenu2;
private javax.swing.JMenuBar jMenuBar1;
private javax.swing.JScrollPane jScrollPane1;
private javax.swing.JScrollPane jScrollPane2;
private javax.swing.JScrollPane jScrollPane3;
private javax.swing.JTextArea jTextArea1;
private javax.swing.JTextArea jTextArea2;
// End of variables declaration
}
在我看來,您實際上從未真正接觸過代碼的GUI部分。 您可能要在這里使用一些多線程,因為這似乎是您的目標。 在構造函數中,您正在調用start方法-到目前為止一切都很好-似乎可以按預期執行。 但是 ,當您在start()
的末尾調用search()
時,它會進入一個無限循環(參數為true
)。 您的循環邏輯阻止了search()
的返回,從而阻止了start()
的返回,然后是構造函數的返回。 希望對您有所幫助,並祝您好運!
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