java压缩文件
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1package com.resoft.util; 3import java.io.BufferedOutputStream; 4import java.io.File; 5import java.io.FileInputStream; 6import java.io.FileNotFoundException; 7import java.io.FileOutputStream; 8import java.io.IOException; 9import java.io.InputStream; 10import java.io.OutputStream; 11import java.util.Enumeration; 13import org.apache.tools.zip.ZipEntry; 14import org.apache.tools.zip.ZipFile; 15import org.apache.tools.zip.ZipOutputStream; 17/** *//*** 压缩/解压缩zip包处理类* * @author yayagepei* @date 2008-8-25*/ 23public class ZipUtil { /** *//** * 压缩 * * @param zipFileName * 压缩产生的zip包文件名--带路径,如果为null或空则默认按文件名生产压缩文件名 * @param relativePath * 相对路径,默认为空 * @param directory * 文件或目录的绝对路径 * @throws FileNotFoundException * @throws IOException * @author yayagepei * @date 2008-8-26 */ public static void zip(String zipFileName, String relativePath, String directory) throws FileNotFoundException, IOException { String fileName = zipFileName; if (fileName == null || fileName.trim().equals("")) { File temp = new File(directory); if (temp.isDirectory()) { fileName = directory + ".zip"; } else { if (directory.indexOf(".") > 0) { fileName = directory.substring(0, directory .lastIndexOf(".")) + "zip"; } else { fileName = directory + ".zip"; } } } ZipOutputStream zos = new ZipOutputStream( new FileOutputStream(fileName)); try { zip(zos, relativePath, directory); } catch (IOException ex) { throw ex; } finally { if (null != zos) { zos.close(); } } } /** *//** * 压缩 * * @param zos * 压缩输出流 * @param relativePath * 相对路径 * @param absolutPath * 文件或文件夹绝对路径 * @throws IOException * @author yayagepei * @date 2008-8-26 */ private static void zip(ZipOutputStream zos, String relativePath, String absolutPath) throws IOException { File file = new File(absolutPath); if (file.isDirectory()) { File[] files = file.listFiles(); for (int i = 0; i < files.length; i++) { File tempFile = files[i]; if (tempFile.isDirectory()) { String newRelativePath = relativePath + tempFile.getName() + File.separator; createZipNode(zos, newRelativePath); zip(zos, newRelativePath, tempFile.getPath()); } else { zipFile(zos, tempFile, relativePath); } } } else { zipFile(zos, file, relativePath); } } /** *//** * 压缩文件 * * @param zos * 压缩输出流 * @param file * 文件对象 * @param relativePath * 相对路径 * @throws IOException * @author yayagepei * @date 2008-8-26 */ private static void zipFile(ZipOutputStream zos, File file, String relativePath) throws IOException { ZipEntry entry = new ZipEntry(relativePath + file.getName()); zos.putNextEntry(entry); InputStream is = null; try { is = new FileInputStream(file); int BUFFERSIZE = 2 << 10; int length = 0; byte[] buffer = new byte[BUFFERSIZE]; while ((length = is.read(buffer, 0, BUFFERSIZE)) >= 0) { zos.write(buffer, 0, length); } zos.flush(); zos.closeEntry(); } catch (IOException ex) { throw ex; } finally { if (null != is) { is.close(); } } } /** *//** * 创建目录 * * @param zos * zip输出流 * @param relativePath * 相对路径 * @throws IOException * @author yayagepei * @date 2008-8-26 */ private static void createZipNode(ZipOutputStream zos, String relativePath) throws IOException { ZipEntry zipEntry = new ZipEntry(relativePath); zos.putNextEntry(zipEntry); zos.closeEntry(); } /** *//** * 解压缩zip包 * * @param zipFilePath * zip文件路径 * @param targetPath * 解压缩到的位置,如果为null或空字符串则默认解压缩到跟zip包同目录跟zip包同名的文件夹下 * @throws IOException * @author yayagepei * @date 2008-9-28 */ public static void unzip(String zipFilePath, String targetPath) throws IOException { OutputStream os = null; InputStream is = null; ZipFile zipFile = null; try { zipFile = new ZipFile(zipFilePath); String directoryPath = ""; if (null == targetPath || "".equals(targetPath)) { directoryPath = zipFilePath.substring(0, zipFilePath .lastIndexOf(".")); } else { directoryPath = targetPath; } Enumeration entryEnum = zipFile.getEntries(); if (null != entryEnum) { ZipEntry zipEntry = null; while (entryEnum.hasMoreElements()) { zipEntry = (ZipEntry) entryEnum.nextElement(); if (zipEntry.isDirectory()) { directoryPath = directoryPath + File.separator + zipEntry.getName(); System.out.println(directoryPath); continue; } if (zipEntry.getSize() > 0) { // 文件 File targetFile = FileUtil.buildFile(directoryPath + File.separator + zipEntry.getName(), false); os = new BufferedOutputStream(new FileOutputStream( targetFile)); is = zipFile.getInputStream(zipEntry); byte[] buffer = new byte[4096]; int readLen = 0; while ((readLen = is.read(buffer, 0, 4096)) >= 0) { os.write(buffer, 0, readLen); } os.flush(); os.close(); } else { // 空目录 FileUtil.buildFile(directoryPath + File.separator + zipEntry.getName(), true); } } } } catch (IOException ex) { throw ex; } finally { if(null != zipFile){ zipFile = null; } if (null != is) { is.close(); } if (null != os) { os.close(); } } }230} 补充一下里面用到的一个自己写的FileUtil的一个方法/** * 生产文件 如果文件所在路径不存在则生成路径 * * @param fileName * 文件名 带路径 * @param isDirectory 是否为路径 * @return * @author yayagepei * @date 2008-8-27 */ public static File buildFile(String fileName, boolean isDirectory) { File target = new File(fileName); if (isDirectory) { target.mkdirs(); } else { if (!target.getParentFile().exists()) { target.getParentFile().mkdirs(); target = new File(target.getAbsolutePath()); } } return target; }
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