实例183 - 简单的文件合并工具

SequenceInputStream类可以用来接收元素类型为输入流的枚举接口类型。本实例将使用它制作一个文件合并工具，可以使用该工具合并文本文件、音频文件、视频文件等。

心法领悟182：文件合并程序的增强。

1. 读者可以在本实例的基础上修改表格控件、增加排序功能，并根据排序的结果来创建SequenceInputStream类的对象。
2. 可以让文件选择器支持选择文件夹，利用文件的扩展名不同将需要合并的文件筛选出来进行合并。
3. 可以为不同类型的文件专门编写一个合并工具。

   package com.mingrisoft.concat;
   
   import java.awt.BorderLayout;
   import java.awt.Dimension;
   import java.awt.EventQueue;
   import java.awt.Font;
   import java.awt.event.ActionEvent;
   import java.awt.event.ActionListener;
   import java.awt.event.WindowAdapter;
   import java.awt.event.WindowEvent;
   import java.io.BufferedInputStream;
   import java.io.File;
   import java.io.FileInputStream;
   import java.io.FileNotFoundException;
   import java.io.FileOutputStream;
   import java.io.IOException;
   import java.io.SequenceInputStream;
   import java.util.ArrayList;
   import java.util.Collections;
   import java.util.List;
   
   import javax.swing.JButton;
   import javax.swing.JFileChooser;
   import javax.swing.JFrame;
   import javax.swing.JLabel;
   import javax.swing.JOptionPane;
   import javax.swing.JPanel;
   import javax.swing.JScrollPane;
   import javax.swing.JTable;
   import javax.swing.JTextField;
   import javax.swing.UIManager;
   import javax.swing.border.EmptyBorder;
   import javax.swing.table.DefaultTableModel;
   import javax.swing.table.JTableHeader;
   
   public class FileConcatenation extends JFrame {
       
       /**
        * 
        */
       private static final long serialVersionUID = 5592010207848128980L;
       private JPanel contentPane;
       private JTextField pathTextField;
       private JTable table;
       private int id;
       private List<FileInputStream> files = new ArrayList<FileInputStream>();
       
       /**
        * Launch the application.
        */
       public static void main(String[] args) {
           try {
               UIManager.setLookAndFeel("com.sun.java.swing.plaf.nimbus.NimbusLookAndFeel");
           } catch (Throwable e) {
               e.printStackTrace();
           }
           EventQueue.invokeLater(new Runnable() {
               public void run() {
                   try {
                       FileConcatenation frame = new FileConcatenation();
                       frame.setVisible(true);
                   } catch (Exception e) {
                       e.printStackTrace();
                   }
               }
           });
       }
       
       /**
        * Create the frame.
        */
       public FileConcatenation() {
           addWindowListener(new WindowAdapter() {
               public void windowActivated(WindowEvent e) {
                   do_this_windowActivated(e);
               }
           });
           setTitle("\u6587\u4EF6\u5408\u5E76\u5DE5\u5177");
           setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
           setBounds(100, 100, 450, 300);
           contentPane = new JPanel();
           contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
           contentPane.setLayout(new BorderLayout(0, 0));
           setContentPane(contentPane);
           
           JPanel choosePanel = new JPanel();
           contentPane.add(choosePanel, BorderLayout.NORTH);
           
           JLabel label = new JLabel("\u65B0\u6587\u4EF6\u7684\u7EDD\u5BF9\u8DEF\u5F84\uFF1A");
           label.setFont(new Font("微软雅黑", Font.PLAIN, 16));
           choosePanel.add(label);
           
           pathTextField = new JTextField();
           pathTextField.setFont(new Font("微软雅黑", Font.PLAIN, 16));
           choosePanel.add(pathTextField);
           pathTextField.setColumns(10);
           
           JButton chooseButton = new JButton("\u589E\u52A0\u6587\u4EF6");
           chooseButton.setFont(new Font("微软雅黑", Font.PLAIN, 16));
           chooseButton.addActionListener(new ActionListener() {
               public void actionPerformed(ActionEvent e) {
                   do_chooseButton_actionPerformed(e);
               }
           });
           choosePanel.add(chooseButton);
           
           JPanel buttonPanel = new JPanel();
           contentPane.add(buttonPanel, BorderLayout.SOUTH);
           
           JButton concatButton = new JButton("\u5408\u5E76\u6587\u4EF6");
           concatButton.setFont(new Font("微软雅黑", Font.PLAIN, 16));
           concatButton.addActionListener(new ActionListener() {
               public void actionPerformed(ActionEvent e) {
                   do_concatButton_actionPerformed(e);
               }
           });
           buttonPanel.add(concatButton);
           
           JScrollPane scrollPane = new JScrollPane();
           contentPane.add(scrollPane, BorderLayout.CENTER);
           
           table = new JTable();
           table.setFont(new Font("微软雅黑", Font.PLAIN, 14));
           table.setRowHeight(30);
           JTableHeader header = table.getTableHeader();
           header.setFont(new Font("微软雅黑", Font.PLAIN, 16));
           header.setPreferredSize(new Dimension(header.getWidth(), 35));
           scrollPane.setViewportView(table);
       }
       
       protected void do_chooseButton_actionPerformed(ActionEvent e) {
           JFileChooser fileChooser = new JFileChooser();
           fileChooser.setFileSelectionMode(JFileChooser.FILES_ONLY);
           int result = fileChooser.showOpenDialog(this);
           if (result == JFileChooser.APPROVE_OPTION) {
               File file = fileChooser.getSelectedFile();
               try {
                   files.add(new FileInputStream(file));
               } catch (FileNotFoundException e1) {
                   e1.printStackTrace();
               }
               DefaultTableModel model = (DefaultTableModel) table.getModel();
               model.addRow(new Object[] { ++id, file.getName() });
           }
       }
       
       protected void do_concatButton_actionPerformed(ActionEvent e) {
           String fileName = pathTextField.getText();
           if (fileName.length() == 0) {
               JOptionPane.showMessageDialog(this, "请输入新文件的绝对路径", "", JOptionPane.WARNING_MESSAGE);
               return;
           }
           if (files.size() == 0) {
               JOptionPane.showMessageDialog(this, "请选择要合并的文件", "", JOptionPane.WARNING_MESSAGE);
               return;
           }
           SequenceInputStream sis = new SequenceInputStream(Collections.enumeration(files));
           BufferedInputStream bis = new BufferedInputStream(sis);
           FileOutputStream out = null;
           try {
               out = new FileOutputStream(fileName);
               int length;
               while ((length = bis.read()) != -1) {
                   out.write(length);
               }
           } catch (IOException e1) {
               e1.printStackTrace();
           } finally {
               if (out != null) {
                   try {
                       out.close();
                   } catch (IOException e1) {
                       e1.printStackTrace();
                   }
               }
           }
           JOptionPane.showMessageDialog(this, "文件合并成功！", "", JOptionPane.WARNING_MESSAGE);
       }
       
       protected void do_this_windowActivated(WindowEvent e) {
           DefaultTableModel model = (DefaultTableModel) table.getModel();
           model.setColumnIdentifiers(new Object[] { "序号", "文件名" });
           table.setModel(model);
       }
   }