转载原文：
写了一个系列，写的很好，强烈推荐去看！
Java压缩技术（二） ZIP压缩——Java原生实现
Java压缩技术（三） ZIP解压缩——Java原生实现
Zip压缩/解压缩工具类
缺点：
压缩包内中文文件名会乱码；压缩/解压缩不支持设置密码；修改缓存系数线程不安全（不让改缓存系数就安全了）；
代码：
package repalce.your.package;import java.io.BufferedInputStream;import java.io.BufferedOutputStream;import java.io.File;import java.io.FileInputStream;import java.io.FileOutputStream;import java.io.IOException;import java.util.zip.CRC32;import java.util.zip.CheckedInputStream;import java.util.zip.CheckedOutputStream;import java.util.zip.ZipEntry;import java.util.zip.ZipInputStream;import java.util.zip.ZipOutputStream;/*** Zip压缩工具类（修改缓存系数线程不安全）*/public class ZipUtil {/** 文件拓展名 */public static final String EXT = ".zip";/** 缓存大小 */public static final int BUFFER_SIZE = 1024;/** 缓存系数 */private static int bufferCoefficient = 8;/*** 获取缓存系数* @return 缓存系数*/public static int setBufferCoefficient(){return bufferCoefficient;}/*** 设置缓存系数* @param bufferCoefficient 缓存系数（大于等于1）*/public static void setBufferCoefficient(int bufferCoefficient) {if(bufferCoefficient < 1) {ZipUtil.bufferCoefficient = 1;}else{ZipUtil.bufferCoefficient = bufferCoefficient;}}// --压缩--------------------------------------------------------------------/*** 压缩* @param srcPath 待压缩文件路径* @throws IOException IO异常*/public static void compress(String srcPath) throws IOException {compress(new File(srcPath));}/*** 压缩* @param srcFile 待压缩文件* @throws IOException IO异常*/public static void compress(File srcFile) throws IOException {// 检查待压缩文件是否为目录if(srcFile.isDirectory()) {compress(srcFile, srcFile.getParent() + File.separator + srcFile.getName() + EXT);}else{// 拓展名起始下标int extStartIndex = srcFile.getName().lastIndexOf(".");// 获取待压缩文件名称String srcFileName = srcFile.getName().substring(0, extStartIndex == -1 ? srcFile.getName().length() : extStartIndex);// 压缩compress(srcFile, srcFile.getParent() + File.separator + srcFileName + EXT);}}/*** 压缩* @param srcPath 待压缩文件路径* @param destPath 压缩文件路径* @throws IOException IO异常*/public static void compress(String srcPath, String destPath) throws IOException {compress(new File(srcPath), destPath);}/*** 压缩* @param srcFile 待压缩文件* @param destPath 压缩文件路径* @throws IOException IO异常*/public static void compress(File srcFile, String destPath) throws IOException {compress(srcFile, new File(destPath));}/*** 压缩* @param srcPath 待压缩文件路径* @param destFile 压缩文件* @throws IOException IO异常*/public static void compress(String srcPath, File destFile) throws IOException {compress(new File(srcPath), destFile);}/*** 压缩* @param srcFile 待压缩文件* @param destFile 压缩文件* @throws IOException IO异常*/public static void compress(File srcFile, File destFile) throws IOException {CheckedOutputStream cos = new CheckedOutputStream(new FileOutputStream(destFile), new CRC32());ZipOutputStream zos = new ZipOutputStream(cos);compress(srcFile, zos, "");zos.flush();zos.close();}/*** 压缩* @param srcFile 源路径* @param zosZip输出流* @param path 压缩包内相对路径* @throws IOException IO异常*/private static void compress(File srcFile, ZipOutputStream zos, String path) throws IOException {// 检查待压缩文件是否为目录if (srcFile.isDirectory()) {compressDir(srcFile, zos, path);} else {compressFile(srcFile, zos, path);}}/*** 压缩目录* @param dir 目录文件* @param zos Zip输出流* @param path 压缩包内相对路径* @throws IOException IO异常*/private static void compressDir(File dir, ZipOutputStream zos, String path) throws IOException {// 目录下所有文件File[] files = dir.listFiles();// 构建空目录if (files.length < 1) {ZipEntry entry = new ZipEntry(path + dir.getName() + File.separator);zos.putNextEntry(entry);zos.closeEntry();}// 递归压缩for (File file : files) {compress(file, zos, path + dir.getName() + File.separator);}}/*** 压缩文件* @param file 待压缩文件* @param zos Zip输出流* @param path 压缩文件中的当前路径* @throws IOException IO异常*/private static void compressFile(File file, ZipOutputStream zos, String path) throws IOException {BufferedInputStream bis = new BufferedInputStream(new FileInputStream(file));ZipEntry entry = new ZipEntry(path + file.getName());zos.putNextEntry(entry);int count;byte data[] = new byte[BUFFER_SIZE * bufferCoefficient];while ((count = bis.read(data, 0, BUFFER_SIZE * bufferCoefficient)) != -1) {zos.write(data, 0, count);}bis.close();zos.closeEntry();}// --解压--------------------------------------------------------------------/*** 解压缩* * @param srcPath 待解压文件路径* @throws IOException IO异常*/public static void decompress(String srcPath) throws IOException {decompress(new File(srcPath));}/*** 解压缩* * @param srcFile 待解压文件* @throws IOException IO异常*/public static void decompress(File srcFile) throws IOException {decompress(srcFile, srcFile.getParent());}/*** 解压缩* * @param srcPath 待解压文件路径* @param destFile 释放目录* @throws IOException IO异常*/public static void decompress(String srcPath, File destFile) throws IOException {decompress(new File(srcPath), destFile);}/*** 解压缩* * @param srcFile 待解压文件* @param destPath 释放目录路径* @throws IOException IO异常*/public static void decompress(File srcFile, String destPath) throws IOException {decompress(srcFile, new File(destPath));}/*** 解压缩* * @param srcPath 待解压文件路径* @param destPath 释放目录路径* @throws IOException*/public static void decompress(String srcPath, String destPath) throws IOException {decompress(new File(srcPath), new File(destPath));}/*** 解压缩* * @param srcFile 待解压文件* @param destFile 释放目录* @throws IOException IO异常*/public static void decompress(File srcFile, File destFile) throws IOException {CheckedInputStream cis = new CheckedInputStream(new FileInputStream(srcFile), new CRC32());ZipInputStream zis = new ZipInputStream(cis);decompress(destFile, zis);zis.close();}/*** 解压缩* * @param destFile 释放目录* @param zisZip输入流* @throws IOException IO异常*/private static void decompress(File destFile, ZipInputStream zis) throws IOException {ZipEntry entry = null;while ((entry = zis.getNextEntry()) != null) {// 文件File dirFile = new File(destFile.getPath() + File.separator + entry.getName());// 文件检查fileProber(dirFile);// 检查是否为文件夹if (entry.isDirectory()) {dirFile.mkdirs(); // 创建文件夹} else {decompressFile(dirFile, zis); // 解压文件}zis.closeEntry();}}/*** 文件探针* 当父目录不存在时，创建目录！* * @param dirFile 目录文件*/private static void fileProber(File dirFile) {File parentFile = dirFile.getParentFile();if (!parentFile.exists()) {// 递归寻找上级目录fileProber(parentFile);parentFile.mkdir();}}/*** 解压缩文件* @param destFile 目标文件* @param zisZip输入流* @throws IOException IO异常*/private static void decompressFile(File destFile, ZipInputStream zis) throws IOException {BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream(destFile));int count;byte[] data = new byte[BUFFER_SIZE * bufferCoefficient];while ((count = zis.read(data, 0, BUFFER_SIZE * bufferCoefficient)) != -1) {bos.write(data, 0, count);}bos.close();}}
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