Question

朋友们，我正在java swing中创建一个网吧管理软件，我想从server.i退出客户端机器上的java软件（欢迎窗口）。这个代码不能正常工作。当客户端运行程序时摆动窗口是不可见的。我可以从服务器关闭它，但我想要的是当客户端编译并运行代码时，应该可以看到摆动窗口，当我从服务器触发关闭命令时关闭它是可能的

    import java.net.*;
import java.io.*;

public class cl extends javax.swing.JFrame {

    /** Creates new form cl */
    public cl() {


    initComponents();
}

/** This method is called from within the constructor to
 * initialize the form.
 * WARNING: Do NOT modify this code. The content of this method is
 * always regenerated by the Form Editor.
 */
@SuppressWarnings("unchecked")
// <editor-fold defaultstate="collapsed" desc="Generated Code">
private void initComponents() {

    jPanel1 = new javax.swing.JPanel();
    jLabel5 = new javax.swing.JLabel();
    jLabel1 = new javax.swing.JLabel();
    jLabel2 = new javax.swing.JLabel();

    setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
    setBackground(new java.awt.Color(255, 204, 204));

    jPanel1.setBackground(new java.awt.Color(255, 204, 204));

    jLabel5.setIcon(new javax.swing.ImageIcon("C:\\Users\\Administrator\\Desktop\\new-1.jpg")); // NOI18N

    jLabel1.setFont(new java.awt.Font("Tahoma", 1, 18)); // NOI18N
    jLabel1.setText("Welcome to our cafe");

    jLabel2.setFont(new java.awt.Font("Arial", 1, 14)); // NOI18N
    jLabel2.setText("Contact Administrator to start your session");

    javax.swing.GroupLayout jPanel1Layout = new javax.swing.GroupLayout(jPanel1);
    jPanel1.setLayout(jPanel1Layout);
    jPanel1Layout.setHorizontalGroup(
        jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
        .addGroup(jPanel1Layout.createSequentialGroup()
            .addContainerGap()
            .addComponent(jLabel5)
            .addGroup(jPanel1Layout.createParallelGroup
   (javax.swing.GroupLayout.Alignment.LEADING)
                .addGroup(jPanel1Layout.createSequentialGroup()
                    .addGap(92, 92, 92)
                    .addComponent(jLabel1))
                .addGroup(jPanel1Layout.createSequentialGroup()
                    .addGap(42, 42, 42)
                    .addComponent(jLabel2)))
            .addContainerGap(872, Short.MAX_VALUE))
    );
    jPanel1Layout.setVerticalGroup(
        jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
        .addGroup(jPanel1Layout.createSequentialGroup()
            .addGroup(jPanel1Layout.createParallelGroup
(javax.swing.GroupLayout.Alignment.LEADING)
                .addGroup(jPanel1Layout.createSequentialGroup()
                    .addContainerGap()
                    .addComponent(jLabel5))
                .addGroup(jPanel1Layout.createSequentialGroup()
                    .addGap(32, 32, 32)
                    .addComponent(jLabel1)
                    .addGap(18, 18, 18)
                    .addComponent(jLabel2)))
            .addContainerGap(597, Short.MAX_VALUE))
    );

    javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
    getContentPane().setLayout(layout);
    layout.setHorizontalGroup(
        layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
        .addComponent(jPanel1, javax.swing.GroupLayout.DEFAULT_SIZE, 
         javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
    );
    layout.setVerticalGroup(
        layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
        .addComponent(jPanel1, javax.swing.GroupLayout.DEFAULT_SIZE,  
       javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)      


    );

    pack();
}// </editor-fold>

/**
 * @param args the command line arguments
 */
public static void main(String args[]) {


try
    {

    String s1,s2;
    Socket s=new Socket("192.168.1.2",1024);
                  DataInputStream dis=new DataInputStream(s.getInputStream());
    DataOutputStream dos=new DataOutputStream(s.getOutputStream());
    BufferedReader br=new BufferedReader(new InputStreamReader(System.in));

    while(true)
    {



s1=dis.readUTF();

if (s1.equals("5"))
{
System.exit(0);
}
    }
    }
    catch(Exception e)
    {
        e.printStackTrace();
    }
}
// Variables declaration - do not modify
private javax.swing.JLabel jLabel1;
private javax.swing.JLabel jLabel2;
private javax.swing.JLabel jLabel5;
private javax.swing.JPanel jPanel1;
// End of variables declaration

}

Answer 1

问题是你永远不会在main（）方法中创建Frame。

将此代码添加到主方法中：

public static void main(String args[]) {
    cl frame = new cl();
    cl.setSize(640,480);
    cl.setVisible(true);
    // rest of code follows...

然后框架将出现。

您可能还想调查是否希望用户能够关闭相框，以及JFrame.setDefaultCloseOperation(int)

我还建议你考虑使用java RMI而不是你自己的协议。 RMI可能会为您提供更多功能/功能，而无需手动编码网络。 RMI也意味着你不需要在一个单独的线程中运行监听：RMI将为你处理。

Answer 2

可能不是您问题的答案，请

1）不要使用NetBeans生成的代码，请使用Standard Swing JComponents

2）寻找正确的LayoutManager，因为很难管理由GroupLayout生成的一堆代码

3）将Socket重定向到后台任务，使用SwingWorker，Runnable#Thread，否则GUI将冻结，直到最后一次结束

java swing为客户端

2 个答案: