Java实现文件解压缩
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.ZipInputStream;import org.apache.tools.zip.ZipEntry;import org.apache.tools.zip.ZipOutputStream;/** * 文件解压缩，需要依赖ant.jar * */public class Zip{ private ZipInputStream zipIn; //解压Zip private ZipOutputStream zipOut; //压缩Zip private java.util.zip.ZipEntry zipEntry; private int bufSize; //size of bytes private byte[] buf; private int readedBytes; /** * 默认buf：1024 */ public Zip(){ this(1024); } /** * 带缓冲大小参数的构造方法 * @param bufSize */ public Zip(int bufSize){ this.bufSize = bufSize; this.buf = new byte[this.bufSize]; } /** * 压缩文件或文件夹 * @param zipDirectory 文件或文件夹的路径 * @param zipFileName 压缩后的文件名，如果为null， 则文件是文件的名称+.zip；文件夹是文件夹的名+.zip */ public void doZip(String zipDirectory,String zipFileName){ //zipDirectoryPath:需要压缩的文件夹名 File zipDir = new File(zipDirectory); if(zipFileName==null) zipFileName = zipDir.getName() + ".zip"; if(zipFileName.indexOf(".zip")==-1) zipFileName+=".zip"; String zipPath=""; try{ if(zipDir.getParentFile()!=null){ zipPath=zipDir.getParentFile().getCanonicalPath()+File.separator; } File zipOutFile=new File(zipPath+zipFileName); zipOut = new ZipOutputStream(new BufferedOutputStream(new FileOutputStream(zipOutFile))); zipOut.setEncoding("gbk"); handleDir(zipDir , zipOut,zipPath); zipOut.close(); }catch(IOException ioe){ ioe.printStackTrace(); } } private void handleDir(File dir , ZipOutputStream zipOut,String basePath) throws IOException{ FileInputStream fileIn; if(dir.isDirectory()){ File[] files; files = dir.listFiles(); if(files.length == 0){//如果目录为空,则单独创建之. //ZipEntry的isDirectory()方法中,目录以"/"结尾. zipOut.putNextEntry(new ZipEntry(dir.getCanonicalPath(). substring(basePath.length()) + "/")); zipOut.closeEntry(); }else{//如果目录不为空,则分别处理目录和文件. for(File fileName : files){ handleDir(fileName,zipOut,basePath); } } }else{ fileIn = new FileInputStream(dir); zipOut.putNextEntry(new ZipEntry(dir.getCanonicalPath(). substring(basePath.length()))); while((readedBytes = fileIn.read(buf))>0){ zipOut.write(buf , 0 , readedBytes); } fileIn.close(); zipOut.closeEntry(); } } /** * 解压zip包 * @param unZipfileName 需要解压的zip文件路径名 */ public void unZip(String unZipfileName){ FileOutputStream fileOut; File file; try {String basePath=new File(unZipfileName).getParentFile().getCanonicalPath();zipIn = new ZipInputStream(new BufferedInputStream(new FileInputStream(unZipfileName)));while ((zipEntry =zipIn.getNextEntry()) != null) {file = new File(basePath+File.separator+zipEntry.getName());if (zipEntry.isDirectory()) {file.mkdirs();} else {File parent = file.getParentFile();if (!parent.exists()) {parent.mkdirs();}fileOut = new FileOutputStream(file);while ((readedBytes = zipIn.read(buf)) > 0) {fileOut.write(buf, 0, readedBytes);}fileOut.close();}zipIn.closeEntry();}} catch (IOException ioe) {ioe.printStackTrace();} } /** * 设置缓冲大小 * @param bufSize */ public void setBufSize(int bufSize){ this.bufSize = bufSize; } public static void main(String[] args)throws Exception{Zip zip = new Zip();String file1 = "C:\\ggg";zip.doZip(file1,null); }}