android 强制下线功能 Android中文件的压缩和解压缩实例代码

public static void zip(String src,String dest) throwsIOException {
  //定义压缩输出流
  ZipOutputStreamout = null;
  try {
    //传入源文件
    File outFile= newFile(dest);
    File fileOrDirectory= newFile(src);
    //传入压缩输出流
    out = newZipOutputStream(newFileOutputStream(outFile));
    //判断是否是一个文件或目录
    //如果是文件则压缩
    if (fileOrDirectory.isFile()){
      zipFileOrDirectory(out,fileOrDirectory, "");
    } else {
      //否则列出目录中的所有文件递归进行压缩
      File[]entries = fileOrDirectory.listFiles();
      for (int i= 0; i < entries.length;i++) {
        zipFileOrDirectory(out,entries,"");
      }
    }
  }catch(IOException ex) {
    ex.printStackTrace();
  }finally{
    if (out!= null){
      try {
        out.close();
      }catch(IOException ex) {
        ex.printStackTrace();
      }
    }
  }
}
private static void zipFileOrDirectory(ZipOutputStream out, File fileOrDirectory, String curPath)throwsIOException {
  FileInputStreamin = null;
  try {
    //判断目录是否为null
    if (!fileOrDirectory.isDirectory()){
      byte[] buffer= new byte[4096];
      int bytes_read;
      in= newFileInputStream(fileOrDirectory);
      //归档压缩目录
      ZipEntryentry = newZipEntry(curPath + fileOrDirectory.getName());
      //将压缩目录写到输出流中
      out.putNextEntry(entry);
      while ((bytes_read= in.read(buffer))!= -1) {
        out.write(buffer,0, bytes_read);
      }
      out.closeEntry();
    } else {
      //列出目录中的所有文件
      File[]entries = fileOrDirectory.listFiles();
      for (int i= 0; i < entries.length;i++) {
        //递归压缩
        zipFileOrDirectory(out,entries,curPath + fileOrDirectory.getName()+ "/");
      }
    }
  }catch(IOException ex) {
    ex.printStackTrace();
  }finally{
    if (in!= null){
      try {
        in.close();
      }catch(IOException ex) {
        ex.printStackTrace();
      }
    }
  }
}

public static void zip(File srcFile, File desFile)throwsIOException {
  GZIPOutputStreamzos = null;
  FileInputStreamfis = null;
  try {
    //创建压缩输出流,将目标文件传入
    zos = newGZIPOutputStream(newFileOutputStream(desFile));
    //创建文件输入流,将源文件传入
    fis = newFileInputStream(srcFile);
    byte[] buffer= new byte[1024];
    int len= -1;
    //利用IO流写入写出的形式将源文件写入到目标文件中进行压缩
    while ((len= (fis.read(buffer)))!= -1) {
      zos.write(buffer,0, len);
    }
  }finally{
    close(zos);
    close(fis);
  }
}

public static void unZip(File srcFile,File desFile) throws IOException {
  GZIPInputStream zis= null;
  FileOutputStreamfos = null;
  try {
    //创建压缩输入流,传入源文件
    zis = new GZIPInputStream(newFileInputStream(srcFile));
    //创建文件输出流,传入目标文件
    fos = newFileOutputStream(desFile);
    byte[] buffer= new byte[1024];
    int len= -1;
    //利用IO流写入写出的形式将压缩源文件解压到目标文件中
    while ((len= (zis.read(buffer)))!= -1) {
      fos.write(buffer,0, len);
    }
  }finally{
    close(zis);
    close(fos);
  }
}