主要用到apache的ant.jar，也可用jdk的相关类，但会有中文乱码问题。最重要的俩类是ZipFile和ZipEntry，前者将zip文件转为java对象，后者将zip文件中的条目文件转为java对象。 核心代码如下：

压缩代码：

ZipOutputStream zipOs = new ZipOutputStream(fos);
ZipEntry zipEntry = new ZipEntry("entryName");
zipOs.putNextEntry(zipEntry);

解压缩代码：

Enumeration<ZipEntry> entries = zipFile.getEntries();
ZipEntry zipEntry = entries.nextElement();
InputStream ins = zipFile.getInputStream(zipEntry);

需要注意的地方：

针对空文件夹需要特殊处理，需要往Entry中放入"/"+文件夹名+"/"项

zipOs.putNextEntry("/");

详细点的练习： /** * 测试文件压缩与解压缩 * */ public class TestZip {

    public static void main(String[] args) {//-->压缩单个文件zipSingleFileOrFolder("D:\\BIZFLOW\\src\\tst\\新建文本文档.zip", "D:\\BIZFLOW\\src\\tst\\新建文本文档.txt");//-->压缩文件夹//zipSingleFileOrFolder("D:\\BIZFLOW\\src\\tst.zip", "D:\\BIZFLOW\\src\\tst");//-->压缩多个文件(不指定压缩文件保存路径)//zipMultiFiles("","D:\\BIZFLOW\\src\\tst\\新建文本文档.txt","D:\\BIZFLOW\\src\\tst\\新建文本文档 - 副本.txt");//-->压缩多个文件(指定压缩文件保存路径)//zipMultiFiles("D:\\BIZFLOW\\src\\tst\\新建.zip","D:\\BIZFLOW\\src\\tst\\新建文本文档.txt","D:\\BIZFLOW\\src\\tst\\新建文本文档 - 副本.txt");//-->解压缩文件//unzipFile("D:\\BIZFLOW\\src\\tst\\新建", "D:\\BIZFLOW\\src\\tst\\新建文本文档.txt等.zip");}/*** 压缩单个文件/文件夹* @param destPath 压缩文件保存路径(为空串/null时默认压缩路径:待压缩文件所在目录，压缩文件名为待压缩文件/文件夹名+“等.zip”)* @param srcPath 待压缩的文件路径*/public static void zipSingleFileOrFolder(String destPath, String srcPath) {if(StringUtils.isBlank(srcPath)) {throw new RuntimeException("待压缩文件夹不可为空！");}if(StringUtils.isNotBlank(destPath) && !destPath.endsWith(".zip")) {throw new RuntimeException("保存文件名应以.zip结尾！");}File file = new File(srcPath);if(!file.exists()) {throw new RuntimeException("路径'"+srcPath+"'下未找到文件");}if(file.isDirectory()) {//压缩文件夹zipFolder(destPath, srcPath);} else {//压缩单个文件zipFile(destPath, srcPath); }}/*** 压缩多个文件* @param destPath 压缩文件保存路径(为空串/null时默认压缩路径:待压缩文件所在目录，压缩文件名为第一个待压缩文件名+“等.zip”)* @param srcPaths 待压缩文件路径集合*/public static void zipMultiFiles(String destPath, String...srcPaths) {if(srcPaths==null || srcPaths.length==0) {throw new RuntimeException("待压缩文件夹不可为空！");}if(StringUtils.isNotBlank(destPath) && !destPath.endsWith(".zip")) {throw new RuntimeException("保存文件名应以.zip结尾！");}zipFiles(destPath, srcPaths);}/*** 解压缩文件* @param destPath 解压缩路径(为空串/null时默认解压缩路径:压缩文件所在目录)* @param zipPath 压缩文件路径*/public static void unzipFile(String destPath, String zipPath) {if(StringUtils.isBlank(zipPath)) {throw new RuntimeException("压缩文件路径不可为空！");}if(!zipPath.endsWith(".zip")) {throw new RuntimeException("保存文件名应以.zip结尾！");}File file = new File(zipPath);if(StringUtils.isBlank(destPath)) {destPath = getUnzipBasePath(file);}if(!file.exists()) {throw new RuntimeException("路径'"+zipPath+"'下未找到文件");}ZipFile zipFile;int len;byte[] buff = new byte[1024];try {zipFile = new ZipFile(zipPath);//获取压缩文件中所有条目Enumeration<ZipEntry> entries = zipFile.getEntries();if(entries!=null) {while(entries.hasMoreElements()) {//压缩文件条目转为文件或文件夹ZipEntry zipEntry = entries.nextElement();//获取输入流InputStream ins = zipFile.getInputStream(zipEntry);BufferedInputStream bis = new BufferedInputStream(ins);File unzipFile = new File(destPath+File.separator+zipEntry.getName());if(zipEntry.isDirectory()) {unzipFile.mkdirs();continue;} File pf = unzipFile.getParentFile();if(pf!=null && !pf.exists()) {pf.mkdirs();}unzipFile.createNewFile();FileOutputStream fos = new FileOutputStream(unzipFile);BufferedOutputStream bos = new BufferedOutputStream(fos);//输出流写文件while((len=bis.read(buff, 0, 1024))!=-1) {bos.write(buff, 0, len);}bos.flush();fos.close();bos.close();}}} catch (IOException e) {e.printStackTrace();throw new RuntimeException();}}/*** 获取解压缩文件基路径* @param zipPath* @return */private static String getUnzipBasePath(File zipPath) {return zipPath.getParentFile().getAbsolutePath();}/*** 压缩单个文件* @param destPath 压缩文件保存路径* @param srcPath 待压缩文件路径*/private static void zipFile(String destPath, String srcPath) {zipFiles(destPath, srcPath);}/*** 压缩多个文件* @param srcPath* @param zipPath*/private static void zipFiles(String destPath, String...srcPaths) {if(StringUtils.isBlank(destPath)) {File srcFile0 = new File(srcPaths[0]);destPath = srcFile0.getParentFile().getAbsolutePath()+File.separator+srcFile0.getName()+"等.zip";}File zipFile = new File(destPath);FileOutputStream fos = null;try {zipFile.createNewFile();zipFile.mkdirs();fos = new FileOutputStream(zipFile);} catch (IOException e) {e.printStackTrace();throw new RuntimeException();}//获取输出流ZipOutputStream zipOs = new ZipOutputStream(fos);//循环将多个文件转为压缩文件条目for(String srcPath : srcPaths) {if(StringUtils.isBlank(srcPath)) {throw new RuntimeException("待压缩文件路径不可为空！");}File srcFile = new File(srcPath);try {ZipEntry zipEntry = new ZipEntry(srcFile.getName());zipOs.putNextEntry(zipEntry);//获取输入流FileInputStream fis = new FileInputStream(srcFile);int len;byte[] buff = new byte[1024];//输入/输出流对拷while((len=fis.read(buff))!=-1) {zipOs.write(buff, 0, len);}fis.close();} catch (FileNotFoundException e) {e.printStackTrace();throw new RuntimeException();} catch (IOException e) {e.printStackTrace();throw new RuntimeException();}}try {zipOs.flush();zipOs.close();} catch (IOException e) {e.printStackTrace();throw new RuntimeException();}}/*** 压缩文件夹* @param destPath 压缩文件保存路径* @param srcPath 待压缩文件夹路径*/private static void zipFolder(String destPath, String srcPath) {File srcFile = new File(srcPath);//如压缩文件保存路径为空，则默认保存路径if(StringUtils.isBlank(destPath)) {destPath = srcFile.getParent()+File.separator+srcFile.getName()+".zip";}FileOutputStream fos = null;ZipOutputStream zipOs = null;try {fos = new FileOutputStream(destPath);zipOs = new ZipOutputStream(fos);//递归往压缩文件中添加文件夹条目zipFolder(srcFile, srcFile, zipOs);zipOs.close();} catch (FileNotFoundException e) {e.printStackTrace();throw new RuntimeException();} catch (IOException e) {e.printStackTrace();throw new RuntimeException();}}/*** 递归往压缩文件中添加文件夹条目* @param srcFile 待压缩文件夹路径* @param baseFile * @param zipOs*/private static void zipFolder(File srcFile, File baseFile, ZipOutputStream zipOs) {int len;byte[] buff = new byte[1024];if(srcFile.isDirectory()) {//针对空文件夹需要特殊处理，需要往Entry中放入"/"+文件夹名+"/"项try {zipOs.putNextEntry(new ZipEntry(srcFile.getAbsolutePath().replaceFirst(baseFile.getParentFile().getAbsolutePath().replaceAll("\\\\", "\\\\\\\\"), "")+"/"));zipOs.closeEntry();} catch (IOException e) {e.printStackTrace();throw new RuntimeException();}//获取当前文件夹下文件列表File[] fileLists = srcFile.listFiles();if(fileLists!=null && fileLists.length>0) {for (int i = 0; i < fileLists.length; i++) {//递归往压缩文件中添加文件夹条目zipFolder(fileLists[i], baseFile, zipOs);}}} else {//文件处理比较简单，直接放入Entrytry {FileInputStream fis = new FileInputStream(srcFile);zipOs.putNextEntry(new ZipEntry(getRelativePath(baseFile.getAbsolutePath(), srcFile)));while((len=fis.read(buff))!=-1) {zipOs.write(buff, 0, len);}zipOs.closeEntry();fis.close();} catch (IOException e) {e.printStackTrace();throw new RuntimeException();}}}/*** 获取相对基路径的相对路径* @param basePath* @param file* @return*/private static String getRelativePath(String basePath, File file) {if(!basePath.equalsIgnoreCase(file.getAbsolutePath())) {return getRelativePath(basePath, file.getParentFile())+File.separator+file.getName();} else {return file.getName();}}}