0

首先通过打开的 menuitem 打开文件，但是当第二次打开时，我选择了在新选项卡中打开的相同文件。我的要求它没有在新选项卡中打开并显示消息文件已经存在。

这是我的代码，

public class Open extends javax.swing.JFrame {
JTextArea tx;
int i=0;
public Open() {
initComponents();
}


@SuppressWarnings("unchecked")
// <editor-fold defaultstate="collapsed" desc="Generated Code">                          
private void initComponents() {

    tp = new javax.swing.JTabbedPane();
    jMenuBar1 = new javax.swing.JMenuBar();
    jMenu1 = new javax.swing.JMenu();
    Open = new javax.swing.JMenuItem();

    setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);

    jMenu1.setText("File");

    Open.setText("Open");
    Open.addActionListener(new java.awt.event.ActionListener() {
        public void actionPerformed(java.awt.event.ActionEvent evt) {
            OpenActionPerformed(evt);
        }
    });
    jMenu1.add(Open);

    jMenuBar1.add(jMenu1);

    setJMenuBar(jMenuBar1);

    javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
    getContentPane().setLayout(layout);
    layout.setHorizontalGroup(
        layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
        .addComponent(tp, javax.swing.GroupLayout.Alignment.TRAILING, javax.swing.GroupLayout.DEFAULT_SIZE, 400, Short.MAX_VALUE)
    );
    layout.setVerticalGroup(
        layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
        .addComponent(tp, javax.swing.GroupLayout.Alignment.TRAILING,   javax.swing.GroupLayout.DEFAULT_SIZE, 279, Short.MAX_VALUE)
    );

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

private void OpenActionPerformed(java.awt.event.ActionEvent evt) {                                     
    final JFileChooser jc = new JFileChooser();
        JComponent panel = new JPanel((LayoutManager) new FlowLayout(
            FlowLayout.LEFT));

    int returnVal=  jc.showOpenDialog(Open.this);
  String title;
    String sts;
   File file=null;
 if(returnVal == JFileChooser.APPROVE_OPTION)     
 file = jc.getSelectedFile();    
 JTextArea text = new JTextArea();
 if (jc.getSelectedFile()!= null) {
  tx = new JTextArea();
    BufferedReader br = null;
    StringBuffer str = new StringBuffer("");
     StringBuffer st = new StringBuffer("");
      try {
        br = new BufferedReader(new FileReader(file));
        String line;

                 while ((line = br.readLine()) != null) {
                str.append(line + "\n");
            }
        } 
        catch (IOException ex) {
                Logger.getLogger(Open.class.getName()).log(Level.SEVERE, null, ex);
        }


    String t = str.toString();

    // tx = new JTextArea();

    final JInternalFrame internalFrame = new JInternalFrame("",true,true);  
  title=file.getName();
  sts=file.getPath();

    tx.setFont(new java.awt.Font("Miriam Fixed", 0, 13));
    //tx.setLineWrap(true);
    internalFrame.add(tx);
    i+=1;
    internalFrame.setName("Doc "+i);
    JScrollPane  scrollpane=new JScrollPane(tx);

             internalFrame.setTitle(title);
    tp.add(internalFrame);
    try{
      tp.setSelectedIndex(i-1);  
    }
    catch(IndexOutOfBoundsException ioe){      
    }
     internalFrame.add(scrollpane);
    internalFrame.setVisible(true);
    internalFrame.addInternalFrameListener(new InternalFrameAdapter() {
        @Override
        public void internalFrameClosing(InternalFrameEvent e) {
            tp.remove(internalFrame);
        }
    });   


    tx.setText(t);
   try {
            br.close();
            } 

         catch (IOException ex) {
            Logger.getLogger(Open.class.getName()).log(Level.SEVERE, null, ex);
        }
    }        
  }                                    
    public static void main(String args[]) {

    java.awt.EventQueue.invokeLater(new Runnable() {
        public void run() {
               try {
                UIManager.setLookAndFeel(
                           UIManager.getSystemLookAndFeelClassName());
            } catch (ClassNotFoundException ex) {
                Logger.getLogger(Open.class.getName()).log(Level.SEVERE, null, ex);
            } catch (InstantiationException ex) {
                Logger.getLogger(Open.class.getName()).log(Level.SEVERE, null, ex);
            } catch (IllegalAccessException ex) {
                Logger.getLogger(Open.class.getName()).log(Level.SEVERE, null, ex);
            } catch (UnsupportedLookAndFeelException ex) {
                Logger.getLogger(Open.class.getName()).log(Level.SEVERE, null, ex);
            }
            new Open().setVisible(true);
        }
    });
}
// Variables declaration - do not modify                     
private javax.swing.JMenuItem Open;
private javax.swing.JMenu jMenu1;
private javax.swing.JMenuBar jMenuBar1;
private javax.swing.JTabbedPane tp;
// End of variables declaration                   
 }
4

1 回答 1

0

您可以维护 AbsoluteFilepath 的 ArrayList ，并在 internalframe 关闭时将它们从列表中删除。我已更新您的代码。请检查并回复

import javax.swing.*;
import javax.swing.event.InternalFrameAdapter;
import javax.swing.event.InternalFrameEvent;
import java.awt.*;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.io.IOException;
import java.util.ArrayList;
import java.util.logging.Level;
import java.util.logging.Logger;


public class Open extends javax.swing.JFrame {
JTextArea tx;
ArrayList<String> fileList;
int i=0;
public Open() {
    fileList=new ArrayList<String>();
    initComponents();
}


@SuppressWarnings("unchecked")
// <editor-fold defaultstate="collapsed" desc="Generated Code">
 private void initComponents() {

    tp = new javax.swing.JTabbedPane();
    jMenuBar1 = new javax.swing.JMenuBar();
    jMenu1 = new javax.swing.JMenu();
    Open = new javax.swing.JMenuItem();

    setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);

    jMenu1.setText("File");

    Open.setText("Open");
    Open.addActionListener(new java.awt.event.ActionListener() {
        public void actionPerformed(java.awt.event.ActionEvent evt) {
            OpenActionPerformed(evt);
        }
    });
    jMenu1.add(Open);

    jMenuBar1.add(jMenu1);

    setJMenuBar(jMenuBar1);

    javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
    getContentPane().setLayout(layout);
    layout.setHorizontalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addComponent(tp, javax.swing.GroupLayout.Alignment.TRAILING, javax.swing.GroupLayout.DEFAULT_SIZE, 400, Short.MAX_VALUE)
    );
    layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addComponent(tp, javax.swing.GroupLayout.Alignment.TRAILING,   javax.swing.GroupLayout.DEFAULT_SIZE, 279, Short.MAX_VALUE)
    );

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

private void OpenActionPerformed(java.awt.event.ActionEvent evt) {
    final JFileChooser jc = new JFileChooser();
    JComponent panel = new JPanel((LayoutManager) new FlowLayout(
            FlowLayout.LEFT));

    int returnVal=  jc.showOpenDialog(Open.this);
    String title;
    String sts;
    File file=null;
    if(returnVal == JFileChooser.APPROVE_OPTION)
    file = jc.getSelectedFile();
    JTextArea text = new JTextArea();
    if (jc.getSelectedFile()!= null && !fileList.contains(file.getAbsolutePath())) {
        fileList.add(file.getAbsolutePath());
        tx = new JTextArea();
        BufferedReader br = null;
        StringBuffer str = new StringBuffer("");
        StringBuffer st = new StringBuffer("");
        try {
            br = new BufferedReader(new FileReader(file));
            String line;

            while ((line = br.readLine()) != null) {
                str.append(line + "\n");
            }
        }
        catch (IOException ex) {
            Logger.getLogger(Open.class.getName()).log(Level.SEVERE, null, ex);
        }


        String t = str.toString();

        // tx = new JTextArea();

        final JInternalFrame internalFrame = new JInternalFrame("",true,true);
        title=file.getName();
        sts=file.getPath();
        final String filePath=file.getAbsolutePath();
        tx.setFont(new java.awt.Font("Miriam Fixed", 0, 13));
        //tx.setLineWrap(true);
        internalFrame.add(tx);
        i+=1;
        internalFrame.setName("Doc "+i);
        JScrollPane  scrollpane=new JScrollPane(tx);

        internalFrame.setTitle(title);
        tp.add(internalFrame);
        try{
            tp.setSelectedIndex(i-1);
        }
        catch(IndexOutOfBoundsException ioe){
        }
        internalFrame.add(scrollpane);
        internalFrame.setVisible(true);
        internalFrame.addInternalFrameListener(new InternalFrameAdapter() {
            @Override
            public void internalFrameClosing(InternalFrameEvent e) {
                fileList.remove(filePath);
                tp.remove(internalFrame);
            }
        });


        tx.setText(t);
        try {
            br.close();
        }

        catch (IOException ex) {
            Logger.getLogger(Open.class.getName()).log(Level.SEVERE, null, ex);
        }
    }
    else
    {
        JOptionPane.showMessageDialog(this, "File is already open");
    }
}
public static void main(String args[]) {

    java.awt.EventQueue.invokeLater(new Runnable() {
        public void run() {
            try {
                UIManager.setLookAndFeel(
                        UIManager.getSystemLookAndFeelClassName());
            } catch (ClassNotFoundException ex) {
                Logger.getLogger(Open.class.getName()).log(Level.SEVERE, null, ex);
            } catch (InstantiationException ex) {
                Logger.getLogger(Open.class.getName()).log(Level.SEVERE, null, ex);
            } catch (IllegalAccessException ex) {
                Logger.getLogger(Open.class.getName()).log(Level.SEVERE, null, ex);
            } catch (UnsupportedLookAndFeelException ex) {
                Logger.getLogger(Open.class.getName()).log(Level.SEVERE, null, ex);
            }
            new Open().setVisible(true);
        }
    });
}
// Variables declaration - do not modify
private javax.swing.JMenuItem Open;
private javax.swing.JMenu jMenu1;
private javax.swing.JMenuBar jMenuBar1;
private javax.swing.JTabbedPane tp;
// End of variables declaration
}
于 2014-09-26T13:35:49.590 回答