org.apache.tools.zip实现文件的压缩和解压，支持中文

刚开始用java.util.Zip，发现不支持中文（网上有修改的方法，但比较麻烦）
后改用org.apache.tools.zip
org.apache.tools.zip的使用网上有更简单的例子
下面的程序根据实际需求，实现了压缩指定目录下指定文件的方法

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.io.Reader;
import java.io.Writer;
import java.util.ArrayList;
import java.util.Enumeration;
import java.util.List;

import org.apache.tools.zip.ZipEntry;
import org.apache.tools.zip.ZipFile;
import org.apache.tools.zip.ZipOutputStream;

import common.Logger;//in jxl.jar （excel）

public class ZipUtil {

	/**
	 * zip操作帮助类
	 * bylijinnan
	 */
	final static Logger logger = Logger.getLogger(ZipUtil.class);

	/**
	 * 打包指定目录下所有文件，包括子文件夹
	 * @param sourceFolder	要打包的文件目录
	 * @param outputFolder	生成的压缩文件存放的目录
	 * @param zipFileName	生成的压缩文件名
	 * @throws IOException
	 */
	public static void zipFolder(String sourceFolder, String outputFolder,String zipFileName, String encoding) throws IOException {
		if (isEmptyStr(sourceFolder) || isEmptyStr(outputFolder) || isEmptyStr(zipFileName)) {
			logger.error("invalid parameters.");
			return;
		}
		sourceFolder = formatFilePath(sourceFolder);
		outputFolder = formatFilePath(outputFolder);
		List<String> filelist = generateFileList(sourceFolder);
		zipFileList(filelist, sourceFolder, outputFolder, zipFileName, encoding);
	}
	
	
	/**
	 * 打包指定的文件。要打包的文件在文件列表中指定
	 * @param filelist	要打包的文件列表，这些文件是绝对路径
	 * @param outputFullFileName	生成的压缩文件全名，目录+文件名
	 * @throws IOException
	 */
	public static void zipFileList(List<String> filelist, String sourceFolder, String outputFolder, String zipFileName, String encoding) throws IOException {
		if (filelist == null || filelist.isEmpty()) {
			logger.error("no files to be zip. filelist is null or empty.");
			return;
		}
		if (isEmptyStr(outputFolder) || isEmptyStr(zipFileName)) {
			logger.error("outputFolder and zipFileName are unspecified.");
			return;
		}
		
		sourceFolder = formatFilePath(sourceFolder);
		outputFolder = formatFilePath(outputFolder);
		if (isEmptyStr(encoding)) {
			encoding = "UTF-8";
		}
		
		File outputDir = new File(outputFolder);
		if (!outputDir.exists()) {
			outputDir.mkdirs();
		}
		
		byte[] buffer = new byte[1024];

		String outputFullFileName = (outputFolder + "/" + zipFileName);
		FileOutputStream fos = new FileOutputStream(outputFullFileName);
		ZipOutputStream zos = new ZipOutputStream(fos);
		zos.setEncoding(encoding);
		logger.info("Output to Zip : " + outputFullFileName);

		for (String file : filelist) {
			if (isEmptyStr(file)) {
				continue;
			}
			logger.info("File Added : " + file);
			ZipEntry ze = new ZipEntry(file);	//这里用的是相对路径
			zos.putNextEntry(ze);

			FileInputStream in = new FileInputStream(sourceFolder + "/" + file);		//这里是绝对路径

			int len;
			while ((len = in.read(buffer)) > 0) {
				zos.write(buffer, 0, len);
			}

			in.close();
		}

		zos.closeEntry();
		// remember close it
		zos.close();

		logger.info("Compress Done");

	}

	/**
	 * Traverse a directory and get all files(include the files in sub directory), add the file into fileList and return it.
	 * 
	 * @param sourceFolder
	 *            file or directory
	 * @return filelist
	 */
	public static List<String> generateFileList(String sourceFolder) {
		List<String> filelist = null;
		if (!isEmptyStr(sourceFolder)) {
			sourceFolder = formatFilePath(sourceFolder);
			filelist = new ArrayList<String>();
			File node = new File(sourceFolder);
			generateFileListHelper(sourceFolder, node, filelist);
		}
		return filelist;
	}
	
	private static void generateFileListHelper(String sourceFolder, File node, List<String> filelist) {

		// add file only
		if (node.isFile()) {
			String absoluteFile = node.getAbsoluteFile().toString();
			String filepath = generateZipEntry(sourceFolder, absoluteFile);
			filelist.add(filepath);
		}

		if (node.isDirectory()) {
			String[] subNote = node.list();
			for (String filename : subNote) {
				File subFile = new File(node, filename);
				generateFileListHelper(sourceFolder, subFile, filelist);
			}
		}

	}

	/**
	 * Format the file path for zip.
	 * Delete the "SOURCE_FOLDER" directory info,e.g.
	 * d:\ziptest\tmpty.txt 		--> tmpty.txt 
	 * d:\ziptest\sub\t.xls 	-->	sub\t.xls
	 * 
	 * @param file
	 *            file path
	 * @return Formatted file path.
	 */
	private static String generateZipEntry(String sourceFolder, String file) {
		logger.debug("sourceFolder=" + sourceFolder);
		logger.debug("file=" + file);
		String formattedPath = file.substring(sourceFolder.length() + 1);
		formattedPath = formatFilePath(formattedPath);
		logger.debug("formattedPath=" + formattedPath);
		return formattedPath;
	}
	
	/**
	 * 将文件路径中的分隔符转换成"/"，并去掉最后的分隔符（如果有）
	 * @param str	文件路径 
	 * @return 格式化后的文件路径
	 */
	public static String formatFilePath(String str) {
		if (str != null && str.length() !=0) {
			 str = str .replaceAll("\\\\", "/");
		}
		if (str.endsWith("/")) {
			str = str.substring(0, str.length()-1);
		}
		return str;
	}
	
	private static boolean isEmptyStr(String str) {
		return str == null || str.length() == 0;
	}
	
	/**
	 * 解压zip文件，支持子文件夹和中文
	 * @param zipFileFullName .zip文件的完整名字，包括文件夹路径
	 * @param outputFolder	解压到指定的文件夹。完整路径，如果不指定或者为null，则默认解压到压缩文件所在的当前文件夹
	 * @param encoding 编码格式
	 */
	@SuppressWarnings("rawtypes")
	public static void unzip(String zipFileFullName, String outputFolder, String encoding) {
		if (zipFileFullName == null || zipFileFullName.length() == 0) {
			return;
		}
		if (!zipFileFullName.endsWith(".zip")) {
			logger.error(zipFileFullName + " is not a zip file.");
			return;
		}
		//change file separator to "/"
		zipFileFullName = zipFileFullName.replaceAll("\\\\", "/");
		//find outputFolder
		String inputFolder = zipFileFullName.replaceAll("/[^/]+\\.zip", "");
		if (outputFolder == null || outputFolder.length() == 0) {
			outputFolder = inputFolder;
		}
		outputFolder = outputFolder.replaceAll("\\\\", "/");
		
		File outputFolderFile = new File(outputFolder);
		if (!outputFolderFile.exists()) {
			outputFolderFile.mkdirs();
		}
		try {
			ZipFile zip = new ZipFile(zipFileFullName, encoding);
			Enumeration zipFileEntries = zip.getEntries();

			while (zipFileEntries.hasMoreElements()) {
				ZipEntry entry =  (ZipEntry) zipFileEntries.nextElement();
				String entryName = entry.getName();
				logger.debug("Extracting,entryName=" + entryName);
				
				/*用本程序中ZipUtil.zipFolder或者ZipUtil.zipFileList生成的zip文件，如果有子文件夹，entry.getName()会直接得到文件而略过了子文件夹：
				 * 程序生成，解压时输出：
				 * Extracting,entryName=sub/subsub/test.txt
				 * 压缩软件7-Zip生成，解压时输出：
				 * Extracting,entryName=sub/subsub/ 
				 * Extracting,entryName=sub/subsub/test.txt
				 * 因此要区别对待
				 */
				
				int lastSlashPos = entryName.lastIndexOf("/");
				if (lastSlashPos != -1 ){
					String folderStr = outputFolder + "/" + entryName.substring(0, lastSlashPos);
					File folder = new File(folderStr);
					if (!folder.exists()) {
						folder.mkdirs();
					}
				}
				if (!entryName.endsWith("/")) {		//this entry is not a directory.
					File outFile = new File(outputFolder + "/" + entryName);
					FileOutputStream fos = new FileOutputStream(outFile);
					Writer bw = new BufferedWriter(new OutputStreamWriter(fos, encoding));
					
					InputStream in = zip.getInputStream(entry);
					Reader reader = new InputStreamReader(in, encoding); 
					BufferedReader br =  new BufferedReader(reader);
					
					String line;
					while ((line = br.readLine()) != null) {
						bw.write(line);
					}
					bw.close();
				}
			}

		} catch (Exception e) {
			logger.error("errors occur when decompressing.");
			e.printStackTrace();
		}
	}
	
	public static void main(String[] argv) {
		
		String sourceFolder = "d:/ziptest";
		String outputFolder = "d:/ziptest";
		String outputFileName = "ziptest.zip";
		try {
			zipFolder(sourceFolder, outputFolder, outputFileName, "GB2312");
		} catch (IOException e) {
			e.printStackTrace();
		}
		
		String zipFileFullName = "d:\\ziptest\\ziptest.zip";
		unzip(zipFileFullName, "d:\\ziptest\\unzip", "GB2312");
		
	}

	
}