Java解压zip,rar的代码

jopen 7年前

通过java实现解压zip,rar的代码。

import java.io.File;    import java.io.FileInputStream;    import java.io.FileOutputStream;    import java.io.IOException;    import java.io.OutputStream;    import java.net.URL;    import java.util.zip.ZipEntry;    import java.util.zip.ZipInputStream;        import com.github.junrar.Archive;    import com.github.junrar.exception.RarException;    import com.github.junrar.rarfile.FileHeader;        public class Main {            public void extractZipFiles() {            String root = "c:/javazip/";            URL url = Main.class.getResource("/aa.zip");            String filename = url.getFile();            try {                // destination folder to extract the contents                byte[] buf = new byte[1024];                ZipInputStream zipinputstream = null;                ZipEntry zipentry;                zipinputstream = new ZipInputStream(new FileInputStream(filename));                zipentry = zipinputstream.getNextEntry();                while (zipentry != null) {                        // for each entry to be extracted                    String entryName = zipentry.getName();                        System.out.println(entryName);                        int n;                    FileOutputStream fileoutputstream;                    File newFile = new File(entryName);                        String directory = newFile.getParent();                        // to creating the parent directories                    if (directory == null) {                        if (newFile.isDirectory()) {                            break;                        }                    } else {                        new File(root + directory).mkdirs();                    }                        if (!zipentry.isDirectory()) {                        System.out.println("File to be extracted....." + entryName);                        fileoutputstream = new FileOutputStream(root + entryName);                        while ((n = zipinputstream.read(buf, 0, 1024)) > -1) {                            fileoutputstream.write(buf, 0, n);                        }                        fileoutputstream.close();                    }                        zipinputstream.closeEntry();                    zipentry = zipinputstream.getNextEntry();                }                zipinputstream.close();            } catch (Exception e) {                e.printStackTrace();            }        }            public void extractRarFiles() {            URL url = Main.class.getResource("/bb.rar");            String filename = url.getFile();            File archive = new File(filename);            File destination = new File("c:/javazip/");                Archive arch = null;            try {                arch = new Archive(archive);            } catch (RarException e) {                e.printStackTrace();            } catch (IOException e) {                e.printStackTrace();            }            if (arch != null) {                if (arch.isEncrypted()) {                    System.out.println("archive is encrypted cannot extreact");                    return;                }                FileHeader fh = null;                while (true) {                    fh = arch.nextFileHeader();                    if (fh == null) {                        break;                    }                    if (fh.isEncrypted()) {                        System.out.println("file is encrypted cannot extract: "                                + fh.getFileNameString());                        continue;                    }                    System.out.println("extracting: " + fh.getFileNameString());                    try {                        if (fh.isDirectory()) {                            createDirectory(fh, destination);                        } else {                            File f = createFile(fh, destination);                            OutputStream stream = new FileOutputStream(f);                            arch.extractFile(fh, stream);                            stream.close();                        }                    } catch (Exception e) {                        e.printStackTrace();                    }                }            }        }            private File createFile(FileHeader fh, File destination) {            File f = null;            String name = null;            if (fh.isFileHeader() && fh.isUnicode()) {                name = fh.getFileNameW();            } else {                name = fh.getFileNameString();            }            f = new File(destination, name);            if (!f.exists()) {                try {                    f = makeFile(destination, name);                } catch (IOException e) {                    e.printStackTrace();                }            }            return f;        }            private File makeFile(File destination, String name) throws IOException {            String[] dirs = name.split("\\\\");            if (dirs == null) {                return null;            }            String path = "";            int size = dirs.length;            if (size == 1) {                return new File(destination, name);            } else if (size > 1) {                for (int i = 0; i < dirs.length - 1; i++) {                    path = path + File.separator + dirs[i];                    new File(destination, path).mkdir();                }                path = path + File.separator + dirs[dirs.length - 1];                File f = new File(destination, path);                f.createNewFile();                return f;            } else {                return null;            }        }            private void createDirectory(FileHeader fh, File destination) {            File f = null;            if (fh.isDirectory() && fh.isUnicode()) {                f = new File(destination, fh.getFileNameW());                if (!f.exists()) {                    makeDirectory(destination, fh.getFileNameW());                }            } else if (fh.isDirectory() && !fh.isUnicode()) {                f = new File(destination, fh.getFileNameString());                if (!f.exists()) {                    makeDirectory(destination, fh.getFileNameString());                }            }        }            private void makeDirectory(File destination, String fileName) {            String[] dirs = fileName.split("\\\\");            if (dirs == null) {                return;            }            String path = "";            for (String dir : dirs) {                path = path + File.separator + dir;                new File(destination, path).mkdir();            }        }            public static void main(String[] args) {            Main main = new Main();            // extract zip            main.extractZipFiles();            // extract rar            main.extractRarFiles();        }    }