原理是调用Process 执行rar命令，所以需要本计安装rar软件才可以执行此示例
package com.mingrisoft;import java.awt.BorderLayout;import java.awt.EventQueue;import java.awt.GridBagConstraints;import java.awt.GridBagLayout;import java.awt.Insets;import java.awt.event.ActionEvent;import java.awt.event.ActionListener;import java.io.File;import java.io.IOException;import java.util.Scanner;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.JProgressBar;import javax.swing.JTextField;import javax.swing.border.EmptyBorder;import javax.swing.filechooser.FileNameExtensionFilter;public class DeCompressRAR extends JFrame { /** * */ private static final long serialVersionUID = -133822277769896479L; /** * 解压缩的线程类 * * @author 李钟尉 */ private final class DeCompressThread extends Thread { private final String command; private DeCompressThread(String command) { this.command = command; } public void run() { try { final Process process = Runtime.getRuntime().exec(command); process.getOutputStream().close(); final Scanner scan = new Scanner(process.getInputStream()); progressBar.setString(null);// 初始化进度条控件 progressBar.setValue(0); while (scan.hasNext()) { String line = scan.nextLine();// 获取进程提示单行信息 // 获取提示信息的进度百分比的索引位置 int index = line.lastIndexOf("%") - 3; if (index <= 0) continue; // 获取进度百分比字符串 String substring = line.substring(index, index 3); // 获取整数的百分比数值 int percent = Integer.parseInt(substring.trim()); progressBar.setValue(percent 1);// 在进度条控件显示百分比 } progressBar.setString("完成"); process.getInputStream().close(); } catch (IOException e1) { e1.printStackTrace(); } } } private JPanel contentPane; private JButton pathButton; private JPanel panel_1; private JLabel label; private JTextField compressFileField; private JButton browseButton; private File rarFile; private JProgressBar progressBar; private JTextField pathField; private JLabel label_1; private JButton deCompressButton; private JLabel label_2; private File dir; /** * Launch the application. */ public static void main(String[] args) { EventQueue.invokeLater(new Runnable() { public void run() { try { DeCompressRAR frame = new DeCompressRAR(); frame.setVisible(true); } catch (Exception e) { e.printStackTrace(); } } }); } /** * Create the frame. */ public DeCompressRAR() { setTitle("解压缩RAR压缩包"); setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); setBounds(100, 100, 450, 154); contentPane = new JPanel(); contentPane.setBorder(new EmptyBorder(5, 5, 5, 5)); contentPane.setLayout(new BorderLayout(0, 0)); setContentPane(contentPane); panel_1 = new JPanel(); contentPane.add(panel_1, BorderLayout.CENTER); GridBagLayout gbl_panel_1 = new GridBagLayout(); gbl_panel_1.columnWidths = new int[] { 0, 60, 0, 0 }; gbl_panel_1.rowHeights = new int[] { 17, 0, 0, 0 }; gbl_panel_1.columnWeights = new double[] { 0.0, 1.0, 0.0, Double.MIN_VALUE }; gbl_panel_1.rowWeights = new double[] { 0.0, 0.0, 0.0, Double.MIN_VALUE }; panel_1.setLayout(gbl_panel_1); label = new JLabel("\u538B\u7F29\u6587\u6863\uFF1A"); GridBagConstraints gbc_label = new GridBagConstraints(); gbc_label.fill = GridBagConstraints.HORIZONTAL; gbc_label.insets = new Insets(0, 0, 5, 5); gbc_label.gridx = 0; gbc_label.gridy = 0; panel_1.add(label, gbc_label); compressFileField = new JTextField(); compressFileField.setEditable(false); GridBagConstraints gbc_compressFileField = new GridBagConstraints(); gbc_compressFileField.insets = new Insets(0, 0, 5, 5); gbc_compressFileField.fill = GridBagConstraints.HORIZONTAL; gbc_compressFileField.gridx = 1; gbc_compressFileField.gridy = 0; panel_1.add(compressFileField, gbc_compressFileField); compressFileField.setColumns(10); browseButton = new JButton("\u6D4F\u89C8"); browseButton.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent arg0) { do_browseButton_actionPerformed(arg0); } }); GridBagConstraints gbc_browseButton = new GridBagConstraints(); gbc_browseButton.insets = new Insets(0, 0, 5, 0); gbc_browseButton.gridx = 2; gbc_browseButton.gridy = 0; panel_1.add(browseButton, gbc_browseButton); label_1 = new JLabel("\u89E3\u538B\u8DEF\u5F84\uFF1A"); GridBagConstraints gbc_label_1 = new GridBagConstraints(); gbc_label_1.insets = new Insets(0, 0, 5, 5); gbc_label_1.gridx = 0; gbc_label_1.gridy = 1; panel_1.add(label_1, gbc_label_1); pathField = new JTextField(); GridBagConstraints gbc_pathField = new GridBagConstraints(); gbc_pathField.insets = new Insets(0, 0, 5, 5); gbc_pathField.fill = GridBagConstraints.HORIZONTAL; gbc_pathField.gridx = 1; gbc_pathField.gridy = 1; panel_1.add(pathField, gbc_pathField); pathField.setColumns(10); pathButton = new JButton("\u8DEF\u5F84"); GridBagConstraints gbc_pathButton = new GridBagConstraints(); gbc_pathButton.insets = new Insets(0, 0, 5, 0); gbc_pathButton.gridx = 2; gbc_pathButton.gridy = 1; panel_1.add(pathButton, gbc_pathButton); pathButton.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent arg0) { do_pathButton_actionPerformed(arg0); } }); label_2 = new JLabel("\u8FDB\u5EA6\uFF1A"); GridBagConstraints gbc_label_2 = new GridBagConstraints(); gbc_label_2.insets = new Insets(0, 0, 0, 5); gbc_label_2.gridx = 0; gbc_label_2.gridy = 2; panel_1.add(label_2, gbc_label_2); progressBar = new JProgressBar(); progressBar.setStringPainted(true); GridBagConstraints gbc_progressBar = new GridBagConstraints(); gbc_progressBar.insets = new Insets(0, 0, 0, 5); gbc_progressBar.fill = GridBagConstraints.HORIZONTAL; gbc_progressBar.gridx = 1; gbc_progressBar.gridy = 2; panel_1.add(progressBar, gbc_progressBar); deCompressButton = new JButton("\u89E3\u538B"); deCompressButton.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { do_deCompressButton_actionPerformed(e); } }); GridBagConstraints gbc_deCompressButton = new GridBagConstraints(); gbc_deCompressButton.gridx = 2; gbc_deCompressButton.gridy = 2; panel_1.add(deCompressButton, gbc_deCompressButton); } /** * 路径按钮的事件处理方法 * * @param arg0 */ protected void do_pathButton_actionPerformed(ActionEvent arg0) { JFileChooser chooser = new JFileChooser();// 创建文件选择器 chooser.setDialogTitle("选择解压缩文件夹");// 设置对话框标题 chooser.setAcceptAllFileFilterUsed(false); // 选择解压缩文件夹 chooser.setFileSelectionMode(JFileChooser.DIRECTORIES_ONLY); int option = chooser.showOpenDialog(this);// 显示文件打开对话框 if (option != JFileChooser.APPROVE_OPTION) return; dir = chooser.getSelectedFile();// 获取选择的文件夹 pathField.setText(dir.toString());// 把文件夹路径跟新到文本框 } /** * 选择RAR压缩文档的浏览按钮的事件处理方法 * * @param arg0 */ protected void do_browseButton_actionPerformed(ActionEvent arg0) { JFileChooser chooser = new JFileChooser();// 创建文件选择器 // 设置选择文件类型为Rar chooser.setFileFilter(new FileNameExtensionFilter("RAR压缩文档", "rar")); chooser.setAcceptAllFileFilterUsed(false); chooser.setDialogTitle("选择RAR压缩文件");// 设置对话框标题 int option = chooser.showOpenDialog(this);// 显示保存对话框 if (option != JFileChooser.APPROVE_OPTION) return; rarFile = chooser.getSelectedFile();// 获取用户定制的RAR文件 compressFileField.setText(rarFile.getPath());// 显示RAR文件路径信息 } /** * 解压按钮的事件处理方法 * * @param e */ protected void do_deCompressButton_actionPerformed(ActionEvent e) { if (rarFile == null)// 如果未选择压缩文档 browseButton.doClick();// 执行选择压缩文件按钮的单击操作 if (dir == null)// 如果未选择解压缩文件夹 pathButton.doClick();// 执行选择解压缩文件夹的路径按钮的单击操作 if (rarFile == null || dir == null)// 如果参数不全，则终止本方法 return; // 创建命令字符串 final String command = "rar x " rarFile " " dir " /y"; // 让用户确认是否覆盖目标文件夹同名文件 int option = JOptionPane.showConfirmDialog(null, "此操作会覆盖目标文件夹同名文件，是否继续"); if (option != JOptionPane.YES_OPTION) return;// 不覆盖目标文件夹内容则不执行解压缩 new DeCompressThread(command).start();// 创建并启动解压缩线程 }}
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