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   源码介绍

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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
    }
}