JAVA压缩与解压缩--zip

通过java打zip包或者解压zip包，没什么特别的，jdk已经提供了API。

?

一。批量文件打压缩与解压缩，打好的zip包可以使用winrar进行解压

import java.io.BufferedInputStream;import java.io.BufferedOutputStream;import java.io.ByteArrayInputStream;import java.io.ByteArrayOutputStream;import java.io.File;import java.io.FileInputStream;import java.io.FileNotFoundException;import java.io.FileOutputStream;import java.io.IOException;import java.io.InputStream;import java.io.OutputStream;import java.text.SimpleDateFormat;import java.util.Date;import java.util.Enumeration;import java.util.List;import java.util.zip.ZipEntry;import java.util.zip.ZipFile;import java.util.zip.ZipInputStream;import java.util.zip.ZipOutputStream;import com.netqin.servlet.CommonServlet;//import org.apache.tools.zip.ZipEntry; //import org.apache.tools.zip.ZipOutputStream; /** 注释乱码。 经过反复测试，发现中文支持有问题。  * google了一下解决方案，用ant包中的两个类 //import org.apache.tools.zip.ZipEntry； //import org.apache.tools.zip.ZipOutputStream； *  替换Java包的对应的两个类 import java.util.zip.ZipFile； import java.util.zip.ZipOutputStream； 即可完美支持中文。 *//** * Java版的Zip工具 * */public class ZipTool {private static final int BUFF_SIZE = 1024 * 1024; // 1M Byte/** * * 批量压缩文件（夹） *  * * @param resFileList 要压缩的文件（夹）列表  * * @param zipFile 生成的压缩文件  * * @throws * IOException 当压缩过程出错时抛出 */public static void zipFiles(List<File> resFileList, File zipFile)throws IOException {ZipOutputStream zipout = new ZipOutputStream(new BufferedOutputStream(new FileOutputStream(zipFile), BUFF_SIZE));for (File resFile : resFileList) {zipFile(resFile, zipout, "");}zipout.close();}/** * * 批量压缩文件（夹） *  * * @param resFileList 要压缩的文件（夹）列表  * * @param zipFile 生成的压缩文件  * * @param comment 压缩文件的注释  * * @throws IOException 当压缩过程出错时抛出 */public static void zipFiles(List<File> resFileList, File zipFile,String comment) throws IOException {ZipOutputStream zipout = new ZipOutputStream(new BufferedOutputStream(new FileOutputStream(zipFile), BUFF_SIZE));for (File resFile : resFileList) {zipFile(resFile, zipout, "");}zipout.setComment(comment);zipout.close();}/**                                                          * 描述 : <将文件写入压缩包中>. <br>*<p>                                                                                                                                                                                                                                                       * @param resFile* @param zipout* @param rootpath* @throws IOException                                                                                       */private static void zipFile(File resFile, ZipOutputStream zipout,String rootpath) throws IOException {rootpath = rootpath+ (rootpath.trim().length() == 0 ? "" : File.separator)+ resFile.getName();if (resFile.isDirectory()) {File[] fileList = resFile.listFiles();for (File file : fileList) {zipFile(file, zipout, rootpath);}} else {byte buffer[] = new byte[BUFF_SIZE];BufferedInputStream in = new BufferedInputStream(new FileInputStream(resFile), BUFF_SIZE);zipout.putNextEntry(new ZipEntry(rootpath));int realLength;while ((realLength = in.read(buffer)) != -1) {zipout.write(buffer, 0, realLength);}in.close();zipout.flush();zipout.closeEntry();}}/** * * 解压缩一个文件 *  * * @param zipFile 压缩文件  * * @param folderPath 解压缩的目标目录  * * @throws * IOException 当压缩过程出错时抛出 */@SuppressWarnings("unchecked")public static void upZipFile(File zipFile, String folderPath)throws IOException {ZipFile zf = new ZipFile(zipFile);for (Enumeration entries = zf.entries(); entries.hasMoreElements();) {ZipEntry entry = ((ZipEntry) entries.nextElement());InputStream in = zf.getInputStream(entry);OutputStream out = new FileOutputStream(folderPath + File.separator+ entry.getName());byte buffer[] = new byte[BUFF_SIZE];int realLength;while ((realLength = in.read(buffer)) > 0) {out.write(buffer, 0, realLength);}in.close();out.close();}}public static void main(String[] args) throws IOException {List resFileList = new ArrayList();resFileList.add(new File("C:\\new.gif"));resFileList.add(new File("C:\\HelloWorld.java"));resFileList.add(new File("C:\\crebas.sql"));resFileList.add(new File("E:\\log.log"));resFileList.add(new File("C:\\ooo\\upx\\"));File zipFile = new File("C:\\txxxt.zip");ZipUtils.zipFiles(resFileList, zipFile);}}

?二.流压缩及解压缩

/**                                                          * 描述 : <将流打包到文件>. <br>*<p>                                                                                                                                                                                                                                                       * @param b 数据流* @param filename 压缩包文件路径* @return* @throws IOException                                                                                       */public static String makeZipFile(byte[] b, String filename)throws IOException {File file = new File(filename+".zip");ZipOutputStream zipout = new ZipOutputStream(new BufferedOutputStream(new FileOutputStream(file), BUFF_SIZE));zipout.putNextEntry(new ZipEntry(filename));zipout.write(b);zipout.flush();zipout.closeEntry();zipout.setComment("");zipout.close();return fileNewName;}/**                                                          * 描述 : <获得文件的数据流>. <br>*<p>                                                                                                                                                                                                                                                       * @param filename 文件路径* @return* @throws FileNotFoundException                                                                                       */public static byte[] getZipFileByte(String filename)throws FileNotFoundException {File file = new File(filename);byte buffer[] = new byte[BUFF_SIZE];InputStream stream = null;byte[] data = null;try {if (file.canRead()) {stream = new FileInputStream(file);data = new byte[Integer.parseInt(String.valueOf(file.length()))];stream.read(data);} else {return null;}} catch (Exception e) {e.printStackTrace();return null;} finally {if (stream != null) {try {stream.close();} catch (IOException e) {e.printStackTrace();}}}return data;}/** * 描述 : <对数据流进行压缩，并返回压缩后的数据流>. <br> *<p> *  * @param b * @return */public byte[] getZipByte(byte[] b) {byte[] compressed = null;ByteArrayOutputStream out = null;ZipOutputStream zout = null;try {out = new ByteArrayOutputStream();zout = new ZipOutputStream(out);zout.putNextEntry(new ZipEntry("0"));zout.write(b);zout.closeEntry();compressed = out.toByteArray();} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();} finally {if (zout != null) {try {zout.close();} catch (IOException e) {}}if (out != null) {try {out.close();} catch (IOException e) {}}}return compressed;}/** * 将压缩后的 byte[] 数据解压缩 *  * @param compressed *            压缩后的 byte[] 数据 * @return 解压后的字符串 * @throws ClassNotFoundException */public static final byte[] decompress(byte[] compressed) {if (compressed == null)return null;ByteArrayOutputStream out = null;ByteArrayInputStream in = null;ZipInputStream zin = null;byte[] decompressed = null;try {out = new ByteArrayOutputStream();in = new ByteArrayInputStream(compressed);zin = new ZipInputStream(in);ZipEntry entry = zin.getNextEntry();byte[] buffer = new byte[1024];int offset = -1;while ((offset = zin.read(buffer)) != -1) {out.write(buffer, 0, offset);}decompressed = out.toByteArray();} catch (Exception e) {e.printStackTrace();decompressed = null;} finally {if (zin != null) {try {zin.close();} catch (IOException e) {}}if (in != null) {try {in.close();} catch (IOException e) {}}if (out != null) {try {out.close();} catch (IOException e) {}}}return decompressed;}

?说明一下，在对流进行压缩时，如果最后没有将流写入到文件里，而是将流直接吐出，这样生成的文件将不能通过winrar进行解压，只能通过java读流的方式解压。

1 楼 浪子柔情 2011-07-12

lz您好 ，你上线后 麻烦你加下我的QQ358846415

就您上面写的批量压缩文件 我有个问题想要请教您 很急 谢谢 @!

等你回信