java打tar

java**打tar.gz包**

2011-01-26 00:36

package src.com.snow.test;

import java.io.BufferedOutputStream; import java.io.File; import java.io.FileInputStream; import java.io.FileNotFoundException; import java.io.FileOutputStream; import java.io.IOException; import java.util.ArrayList; import java.util.List; import java.util.zip.GZIPOutputStream;

import org.apache.tools.tar.TarEntry; import org.apache.tools.tar.TarOutputStream; import org.apache.tools.zip.ZipOutputStream;

// / 功能：压缩文件成tar.gz格式 // public class TarUtils { private static int BUFFER = 1024 / 4; // 缓冲大小 private static byte[] B_ARRAY = new byte[BUFFER];

// / 方法功能：打包单个文件或文件夹 参数：inputFileName 要打包的文件夹或文件的路径 targetFileName 打包后的文件路径 /*/ public void execute(String inputFileName, String targetFileName) { File inputFile = new File(inputFileName); String base = inputFileName .substring(inputFileName.lastIndexOf("/") + 1); TarOutputStream out = getTarOutputStream(targetFileName); tarPack(out, inputFile, base); try { if (null != out) { out.close(); } } catch (IOException e) { e.printStackTrace(); } compress(new File(targetFileName)); }

// / 方法功能：打包多个文件或文件夹 参数：inputFileNameList 要打包的文件夹或文件的路径的列表 targetFileName / 打包后的文件路径 // public void execute(List inputFileNameList, String targetFileName) { TarOutputStream out = getTarOutputStream(targetFileName);

for (String inputFileName : inputFileNameList) { File inputFile = new File(inputFileName); String base = inputFileName.substring(inputFileName .lastIndexOf("/") + 1); tarPack(out, inputFile, base); }

try { if (null != out) { out.close(); } } catch (IOException e) { e.printStackTrace(); } compress(new File(targetFileName)); }

// / 方法功能：打包成tar文件 参数：out 打包后生成文件的流 inputFile 要压缩的文件夹或文件 base 打包文件中的路径 /*/

private void tarPack(TarOutputStream out, File inputFile, String base) { if (inputFile.isDirectory()) // 打包文件夹 { packFolder(out, inputFile, base); } else // 打包文件 { packFile(out, inputFile, base); } }

// / 方法功能：遍历文件夹下的内容，如果有子文件夹，就调用tarPack方法 参数：out 打包后生成文件的流 inputFile 要压缩的文件夹或文件 / base 打包文件中的路径 // private void packFolder(TarOutputStream out, File inputFile, String base) { File[] fileList = inputFile.listFiles(); try { // 在打包文件中添加路径 out.putNextEntry(new TarEntry(base + "/")); } catch (IOException e) { e.printStackTrace(); } base = base.length() == 0 ? "" : base + "/"; for (File file : fileList) { tarPack(out, file, base + file.getName()); } }

// / 方法功能：打包文件 参数：out 压缩后生成文件的流 inputFile 要压缩的文件夹或文件 base 打包文件中的路径 /*/ private void packFile(TarOutputStream out, File inputFile, String base) { TarEntry tarEntry = new TarEntry(base);

// 设置打包文件的大小，如果不设置，打包有内容的文件时，会报错 tarEntry.setSize(inputFile.length()); try { out.putNextEntry(tarEntry); } catch (IOException e) { e.printStackTrace(); } FileInputStream in = null; try { in = new FileInputStream(inputFile); } catch (FileNotFoundException e) { e.printStackTrace(); } int b = 0;

try { while ((b = in.read(B_ARRAY, 0, BUFFER)) != -1) { out.write(B_ARRAY, 0, b); } } catch (IOException e) { e.printStackTrace(); } catch (NullPointerException e) { System.err .println("NullPointerException info ======= [FileInputStream is null]"); } finally { try { if (null != in) { in.close(); } if (null != out) { out.closeEntry(); } } catch (IOException e) {

} } }

// / 方法功能：把打包的tar文件压缩成gz格式 参数：srcFile 要压缩的tar文件路径 /*/ private void compress(File srcFile) { File target = new File(srcFile.getAbsolutePath() + ".gz"); FileInputStream in = null; GZIPOutputStream out = null; try { in = new FileInputStream(srcFile); out = new GZIPOutputStream(new FileOutputStream(target)); int number = 0; while ((number = in.read(B_ARRAY, 0, BUFFER)) != -1) { out.write(B_ARRAY, 0, number); } } catch (FileNotFoundException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } finally { try { if (in != null) { in.close(); }

if (out != null) {
 out.close();
}

} catch (IOException e) { e.printStackTrace(); } } }

// / 方法功能：获得打包后文件的流 参数：targetFileName 打包后文件的路径 /*/ private TarOutputStream getTarOutputStream(String targetFileName) { // 如果打包文件没有.tar后缀名，就自动加上 targetFileName = targetFileName.endsWith(".tar") ? targetFileName : targetFileName + ".tar"; FileOutputStream fileOutputStream = null; try { fileOutputStream = new FileOutputStream(targetFileName); } catch (FileNotFoundException e) { e.printStackTrace(); } BufferedOutputStream bufferedOutputStream = new BufferedOutputStream( fileOutputStream); TarOutputStream out = new TarOutputStream(bufferedOutputStream);

// 如果不加下面这段，当压缩包中的路径字节数超过100 byte时，就会报错 out.setLongFileMode(TarOutputStream.LONGFILE_GNU); return out; }

}