JAVA核心知识点--Zip压缩工具类（三）（解决中文乱码）

在Java项目中需要对文件夹的内容进行Zip压缩，参考了网上的代码并修复了里面的一些问题，例如：中文乱码、媒体文件解压后损坏。 

所使用的Jar包：ant-*.*.*.jar和log4j-*.*.*.jar，示例工程的CSDN下载地址：

http://download.csdn.net/download/pengjunlee/10124740  

ZipUtil工具类源码

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.log4j.Logger;
import org.apache.tools.zip.ZipEntry;
import org.apache.tools.zip.ZipFile;
import org.apache.tools.zip.ZipOutputStream;

public class ZipUtil {

	private static final Logger logger = Logger.getLogger(ZipUtil.class);

	/**
	 * 由于压缩方法是静态方法，无须创建工具类实例，故将构造方法声明为私有
	 */
	private ZipUtil() {

	}

	/**
	 * 压缩文件或目录
	 * 
	 * @param srcPath
	 *            要压缩的源文件或目录
	 * @param destPath
	 *            生成的压缩文件全名，这里是绝对路径
	 * @param encoding
	 *            压缩时采用的编码格式
	 */
	public static void zip(String srcPath, String destPath, String encoding){
		if (isEmptyStr(srcPath) || isEmptyStr(destPath)) {
			logger.error("invalid zip parameters...");
			return;
		}
		if (isEmptyStr(encoding)) {
			encoding = "UTF-8";
		}
		zip(new File(srcPath), new File(destPath), encoding);
	}

	/**
	 * 压缩文件或目录
	 * 
	 * @param srcFile
	 *            目录或者单个文件
	 * @param destFile
	 *            压缩后的ZIP文件
	 * @param encoding
	 *            压缩时采用的编码格式
	 */
	public static void zip(File srcFile, File destFile, String encoding) {
		File parentFile = destFile.getParentFile();
		if (!parentFile.exists()) {
			parentFile.mkdirs();
		}
		ZipOutputStream out = null;
		try {
			out = new ZipOutputStream(new FileOutputStream(destFile));
			out.setEncoding(encoding);
			zip(srcFile, out);
		} catch (Exception e) {
			logger.error(e.getMessage());
		} finally {
			if (null != out) {
				try {
					out.close();// 记得关闭资源
				} catch (IOException e) {
					logger.error(e.getMessage());
				}
			}
		}
	}

	/**
	 * 压缩文件或目录
	 * 
	 * @param srcFile
	 *            目录或者单个文件
	 * @param out
	 *            压缩文件输出流
	 */
	public static void zip(File srcFile, ZipOutputStream out) {
		zip(srcFile, out, "");
	}

	/**
	 * 压缩文件或目录
	 * 
	 * @param srcFile
	 *            目录或者单个文件
	 * @param out
	 *            压缩文件输出流
	 * @param curPaht
	 *            正在压缩的当前文件与srcPath的相对路径
	 */
	public static void zip(File srcFile, ZipOutputStream out, String curPaht) {
		if (srcFile.isDirectory()) {
			File[] files = srcFile.listFiles();
			if (files != null && files.length > 0) {
				for (File file : files) {
					String name = srcFile.getName();
					if (!"".equals(curPaht)) {
						name = curPaht + File.separator + name;
					}
					ZipUtil.zip(file, out, name);
				}
			}
		} else {
			doZip(srcFile, out, curPaht);
		}
	}

	/**
	 * 压缩文件
	 * 
	 * @param file
	 *            要压缩的文件
	 * @param out
	 *            压缩文件输出流
	 * @param curPath
	 *            正在压缩的当前文件与srcPath的相对路径
	 */
	public static void doZip(File file, ZipOutputStream out, String curPath) {
		String entryName = null;
		if (!"".equals(curPath)) {
			entryName = curPath + File.separator + file.getName();
		} else {
			entryName = file.getName();
		}
		ZipEntry entry = new ZipEntry(entryName);
		FileInputStream fis = null;
		try {
			out.putNextEntry(entry);
			fis = new FileInputStream(file);
			int len = 0;
			byte[] buffer = new byte[1024];
			while ((len = fis.read(buffer)) > 0) {
				out.write(buffer, 0, len);
				out.flush();
			}
			out.closeEntry();
		} catch (IOException e) {
			logger.error(e.getMessage());
		} finally {
			if (null != fis) {
				try {
					fis.close();
				} catch (IOException e) {
					logger.error(e.getMessage());
				}
			}
		}

	}

	/**
	 * 判断是否为空字符串
	 * 
	 * @param str
	 * @return
	 */
	private static boolean isEmptyStr(String str) {
		return str == null || str.length() == 0;
	}

	/**
	 * 解压缩
	 * 
	 * @param zipFilePath
	 *            压缩文件路径
	 * @param outputDirectory
	 *            解压缩后文件存放的目录
	 * @param encoding
	 *            解压缩时采用的编码格式
	 */
	public static void unzip(String zipFilePath, String outputDirectory,String encoding){
		if (isEmptyStr(zipFilePath) || isEmptyStr(outputDirectory)) {
			logger.error("invalid unzip parameters...");
			return;
		}
		if (isEmptyStr(encoding)) {
			encoding = "UTF-8";
		}
		ZipFile zipFile=null;
		try {
			zipFile = new ZipFile(zipFilePath, encoding);
		} catch (IOException e) {
			logger.error(e.getMessage());
		}
		unzip(zipFile, outputDirectory,encoding);
	}

	/**
	 * 解压缩
	 * 
	 * @param zipFile
	 *            源压缩文件
	 * @param outputDirectory
	 *            解压缩后文件存放目录
	 * @param encoding
	 *            解压缩时采用的编码格式
	 */
	@SuppressWarnings("rawtypes")
	private static void unzip(ZipFile zipFile, String outputDirectory,String encoding) {
		File outputFile=new File(outputDirectory);
		if (!outputFile.exists()) {
			outputFile.mkdirs();
		}
		try {
			Enumeration zipEntries = zipFile.getEntries();
			ZipEntry zipEntry = null;

			while (zipEntries.hasMoreElements()) {
				zipEntry = (ZipEntry) zipEntries.nextElement();

				String entryName = new String(zipEntry.getName().getBytes(
						encoding), encoding);

				InputStream in = null;
				FileOutputStream out = null;

				try {
					if (zipEntry.isDirectory()) {
						String name = zipEntry.getName();
						name = name.substring(0, name.length() - 1);

						File f = new File(outputDirectory + File.separator
								+ name);
						f.mkdirs();
					} else {
						int index = entryName.lastIndexOf("\\");
						if (index != -1) {
							File df = new File(outputDirectory + File.separator
									+ entryName.substring(0, index));
							df.mkdirs();
						}
						index = entryName.lastIndexOf("/");
						if (index != -1) {
							File df = new File(outputDirectory + File.separator
									+ entryName.substring(0, index));
							df.mkdirs();
						}

						File f = new File(outputDirectory + File.separator
								+ zipEntry.getName());
						// f.createNewFile();
						in = zipFile.getInputStream(zipEntry);
						out = new FileOutputStream(f);

						int len;
						byte[] buffer = new byte[1024 * 1024];

						while ((len = in.read(buffer)) != -1) {
							out.write(buffer, 0, len);
						}
						out.flush();
					}
				} catch (IOException e) {
					logger.error("解压失败...");
					logger.error(e.getMessage());
				} finally {
					if (null != in) {
						try {
							in.close();
						} catch (IOException e) {
							logger.error(e.getMessage());
						}
					}
					if (null != out) {
						try {
							out.close();
						} catch (IOException e) {
							logger.error(e.getMessage());
						}
					}
				}
			}

		} catch (IOException e) {
			logger.error("解压失败...");
			logger.error(e.getMessage());
		} finally {
			if (null != zipFile) {
				try {
					zipFile.close();
				} catch (IOException e) {
					logger.error(e.getMessage());
				}
			}
		}
		
	}
	
	public static void main(String[] args) {
		ZipUtil.zip("D:\\sourceFolder", "D:\\targetFolder\\test.zip", "GBK");
		ZipUtil.unzip("D:\\targetFolder\\test.zip", "D:\\test", "GBK");

	}

}