java实现将ZIP压缩文件解压的工具类

 

package com.lanp;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.zip.ZipEntry;
import java.util.zip.ZipException;
import java.util.zip.ZipFile;
import java.util.zip.ZipInputStream;

/**
 * 解压ZIP压缩文件到指定的目录
 * @author LanP
 * @since 2012-3-13 8:57:18
 */
public final class ZipToFile {
	/**
	 * 缓存区大小默认20480
	 */
	private final static int FILE_BUFFER_SIZE = 20480;
	
	private ZipToFile() {
		
	}
	
	/**
	 * 将指定目录的ZIP压缩文件解压到指定的目录
	 * @param zipFilePath		ZIP压缩文件的路径
	 * @param zipFileName		ZIP压缩文件名字
	 * @param targetFileDir		ZIP压缩文件要解压到的目录
	 * @return flag				布尔返回值
	 */
	public static boolean unzip(String zipFilePath, String zipFileName, String targetFileDir){
		boolean flag = false;
		//1.判断压缩文件是否存在，以及里面的内容是否为空
		File file = null;			//压缩文件(带路径)
		ZipFile zipFile = null;
		file = new File(zipFilePath + "/" + zipFileName);
		System.out.println(">>>>>>解压文件【" + zipFilePath + "/" + zipFileName + "】到【" + targetFileDir + "】目录下<<<<<<");
		if(false == file.exists()) {
			System.out.println(">>>>>>压缩文件【" + zipFilePath + "/" + zipFileName + "】不存在<<<<<<");
			return false;
		} else if(0 == file.length()) {
			System.out.println(">>>>>>压缩文件【" + zipFilePath + "/" + zipFileName + "】大小为0不需要解压<<<<<<");
			return false;
		} else {
			//2.开始解压ZIP压缩文件的处理
			byte[] buf = new byte[FILE_BUFFER_SIZE];
			int readSize = -1;
			ZipInputStream zis = null;
			FileOutputStream fos = null;
			try {
				// 检查是否是zip文件
				zipFile = new ZipFile(file);
				zipFile.close();
				// 判断目标目录是否存在，不存在则创建
				File newdir = new File(targetFileDir);
				if (false == newdir.exists()) {
					newdir.mkdirs();
					newdir = null;
				}
				zis = new ZipInputStream(new FileInputStream(file));
				ZipEntry zipEntry = zis.getNextEntry();
				// 开始对压缩包内文件进行处理
				while (null != zipEntry) {
					String zipEntryName = zipEntry.getName().replace('\\', '/');
					//判断zipEntry是否为目录，如果是，则创建
					if(zipEntry.isDirectory()) {
						int indexNumber = zipEntryName.lastIndexOf('/');
						File entryDirs = new File(targetFileDir + "/" + zipEntryName.substring(0, indexNumber));
						entryDirs.mkdirs();
						entryDirs = null;
					} else {
						try {
							fos = new FileOutputStream(targetFileDir + "/" + zipEntryName);
							while ((readSize = zis.read(buf, 0, FILE_BUFFER_SIZE)) != -1) {
								fos.write(buf, 0, readSize);
							}
						} catch (Exception e) {
							e.printStackTrace();
							throw new RuntimeException(e.getCause()); 
						} finally {
							try {
								if (null != fos) {
									fos.close();
								}
							} catch (IOException e) {
								e.printStackTrace();
								throw new RuntimeException(e.getCause()); 
							}
						}
					}
					zipEntry = zis.getNextEntry();
				}
				flag = true;
			} catch (ZipException e) {
				e.printStackTrace();
				throw new RuntimeException(e.getCause()); 
			} catch (IOException e) {
				e.printStackTrace();
				throw new RuntimeException(e.getCause()); 
			} finally {
				try {
					if (null != zis) {
						zis.close();
					}
					if (null != fos) {
						fos.close();
					}
				} catch (IOException e) {
					e.printStackTrace();
					throw new RuntimeException(e.getCause()); 
				}
			}
		}
		return flag;
	}

	/**
	 * 测试用的Main方法
	 */
	public static void main(String[] args) {
		String zipFilePath = "C:\\home";
		String zipFileName = "lp20120301.zip";
		String targetFileDir = "C:\\home\\lp20120301";
		boolean flag = ZipToFile.unzip(zipFilePath, zipFileName, targetFileDir);
		if(flag) {
			System.out.println(">>>>>>解压成功<<<<<<");
		} else {
			System.out.println(">>>>>>解压失败<<<<<<");
		}
	}

}

OK，TKS！