做一些调试,我认为错误发生在下面这个方法中。该方法基本上向服务器发送一个 ID(字符串),服务器在收到此 ID 后查找一条记录,并将其发送回客户端。ID 显示在用户选择的 GUI JList 中,因此每次用户单击 JList 中的不同 ID 时,此方法由 ListSelectionListener 事件激活。一旦客户端从服务器接收到记录,它就会在 JTextField 中显示它。当用户第一次单击 JList 中的 ID 时,一切都按预期工作。但是当您单击列表中的另一条记录时,我得到了异常:
java.net.SocketException:套接字已关闭
编辑:现在我得到:
java.net.SocketException:软件导致连接中止:recv 失败
客户端程序:
import java.awt.BorderLayout;
import java.awt.Dimension;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.net.Socket;
import java.net.UnknownHostException;
import java.util.ArrayList;
import javax.swing.DefaultListModel;
import javax.swing.JFrame;
import javax.swing.JList;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextField;
import javax.swing.event.ListSelectionEvent;
import javax.swing.event.ListSelectionListener;
public class ClientGUI extends JFrame implements ListSelectionListener{
//gui components
JList jlist = null;
String requestID = null; //Assigned to selected ID in JList.
JScrollPane scpane = null;
JTextField field = null;
JPanel pane = null;
DefaultListModel<String> listModel = null;
ArrayList<String> idList = null;
//client stuff:
Socket sock1 = null;
Socket sock2 = null;
ObjectInputStream in = null;
ObjectOutputStream out = null;
public ClientGUI() throws ClassNotFoundException{
//get List of IDs from Server1
try{
sock1 = new Socket("FahadAhmed-PC", 8889);
in = new ObjectInputStream(sock1.getInputStream());
idList = new ArrayList<String>(29);
ArrayList<Customer> custList = null;
custList = (ArrayList<Customer>) in.readObject();
for(Customer c : custList){
idList.add(c.getID());
}
in.close();
sock1.close();
sock2 = new Socket("FahadAhmed-PC", 8888);
ArrayList streams = new ArrayList(3);
streams.add(out = new ObjectOutputStream(sock2.getOutputStream()));
streams.add(in = new ObjectInputStream(sock2.getInputStream()));
}catch(UnknownHostException e) {
System.err.println("Don't know about host: FahadAhmed-PC");
System.exit(1);
}catch(IOException e){
System.err.println(e);
System.exit(1);
}
//Setup GUI
jlist = new JList(idList.toArray());
jlist.setVisibleRowCount(10);
scpane = new JScrollPane(jlist);
jlist.addListSelectionListener(this);
pane = new JPanel(new BorderLayout());
pane.setPreferredSize(new Dimension(300, 300));
field = new JTextField(29);
field.setEditable(false);
pane.add(scpane, BorderLayout.PAGE_START);
pane.add(field, BorderLayout.PAGE_END);
this.setContentPane(pane);
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
this.pack();
this.setVisible(true);
}
public static void main(String args[]) throws ClassNotFoundException{
ClientGUI gui = new ClientGUI();
}
@Override
public void valueChanged(ListSelectionEvent arg0) {
if(!arg0.getValueIsAdjusting())
try {
System.out.println(jlist.getSelectedValue().toString());
getRecord(jlist.getSelectedValue().toString());
} catch (ClassNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
private void getRecord(String getID) throws ClassNotFoundException {
try{
//System.out.println(getID + "sent to getRecord method");
out.writeObject(getID);
String rec = (String) in.readObject();
field.setText(rec);
//in.close();
//sock2.shutdownInput();
out.flush();
//sock2.shutdownOutput();
//out.close();
}catch(UnknownHostException e) {
System.err.println("Don't know about host: FahadAhmed-PC");
System.exit(1);
}catch(IOException e){
System.err.println(e);
System.exit(1);
}
}
}