java 壓縮和解壓縮文件

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.Enumeration;
import org.apache.tools.zip.ZipEntry;
import org.apache.tools.zip.ZipFile;
import org.apache.tools.zip.ZipOutputStream;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**

壓縮，解壓，刪除，拷貝操作。

注意：此類中用到的壓縮類ZipEntry等都來自于org.apache.tools包而非java.util。此包在ant.jar中有。


@author Tony
*/
public class FileUtil {
protected static Logger log = LoggerFactory.getLogger(FileUtil.class);
/**


壓縮文件

@param inputFileName
要壓縮的文件或文件夾路徑，例如：c:\a.txt,c:\a\

@param outputFileName
輸出zip文件的路徑，例如：c:\a.zip
*/
public static void zip(String inputFileName, String outputFileName)
 throws Exception {

 ZipOutputStream out = new ZipOutputStream(new FileOutputStream(
     outputFileName));

 zip(out, new File(inputFileName), "");
 log.debug("壓縮完成！");
 out.closeEntry();
 out.close();
}

/**


壓縮文件

@param out
org.apache.tools.zip.ZipOutputStream

@param file
待壓縮的文件

@param base
壓縮的根目錄
*/
private static void zip(ZipOutputStream out, File file, String base)
 throws Exception {

 if (file.isDirectory()) {
 File[] fl = file.listFiles();
 base = base.length() == 0 ? "" : base + File.separator;
 for (int i = 0; i < fl.length; i++) {
     zip(out, fl[i], base + fl[i].getName());
 }

 } else {
 out.putNextEntry(new ZipEntry(base));
 log.debug("添加壓縮文件：" + base);
 FileInputStream in = new FileInputStream(file);
 int b;
 while ((b = in.read()) != -1) {
     out.write(b);
 }
 in.close();

 }
}

/**


解壓zip文件

@param zipFileName
待解壓的zip文件路徑，例如：c:\a.zip

@param outputDirectory
解壓目標文件夾,例如：c:\a\
*/
public static void unZip(String zipFileName, String outputDirectory)
 throws Exception {

 ZipFile zipFile = new ZipFile(zipFileName);
 try {
 Enumeration<?> e = zipFile.getEntries();
 ZipEntry zipEntry = null;
 createDirectory(outputDirectory, "");
 while (e.hasMoreElements()) {
     zipEntry = (ZipEntry) e.nextElement();
     log.debug("解壓：" + zipEntry.getName());
     if (zipEntry.isDirectory()) {
         String name = zipEntry.getName();
         name = name.substring(0, name.length() - 1);
         File f = new File(outputDirectory + File.separator + name);
         f.mkdir();
         log.debug("創建目錄：" + outputDirectory + File.separator + name);
     } else {
         String fileName = zipEntry.getName();
         fileName = fileName.replace('\\', '/');
         if (fileName.indexOf("/") != -1) {
             createDirectory(outputDirectory, fileName.substring(0,
                     fileName.lastIndexOf("/")));
             fileName = fileName.substring(
                     fileName.lastIndexOf("/") + 1,
                     fileName.length());
         }
         File f = new File(outputDirectory + File.separator
                 + zipEntry.getName());
         f.createNewFile();
         InputStream in = zipFile.getInputStream(zipEntry);
         FileOutputStream out = new FileOutputStream(f);
         byte[] by = new byte[1024];
         int c;
         while ((c = in.read(by)) != -1) {
             out.write(by, 0, c);
         }
         in.close();
         out.close();
     }
 }

 } catch (Exception ex) {
 System.out.println(ex.getMessage());

 } finally {
 zipFile.close();
 log.debug("解壓完成！");

 }
}





}
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