Java实现文件解压缩源码

package com.zyuc.zipfile;

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
 * @title: UnZipFile  
 * @description:
 * @author wangxw
 * @since  2012-4-11下午01:55:22   
 * @version 1.0
 */
public final class UnZipFile {
	 
	    /**
		 * 
		 * 缓存区大小默认20480
		 * 
		 */ 
		private final static int FILE_BUFFER_SIZE = 20480;  

		private UnZipFile() {}  

	    /**
		 * 
		 * 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); 
	        if(false == file.exists()) {  
	            System.out.println(">>>>>>压缩文件【" + zipFilePath + "/" + zipFileName + "】不存在<<<<<<");  
	            return false;  
	        }else {  
	            // 2.开始解压ZIP压缩文件的处理
		        System.out.println(">>>>>>解压文件【" + zipFilePath + "/" + zipFileName + "】到【" + targetFileDir + "】目录下<<<<<<"); 
	            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 = "D:\\test";  
	        String zipFileName = "qqqq.zip";  
	        String targetFileDir = "D:\\test";  
	        boolean flag = UnZipFile.unzip(zipFilePath, zipFileName, targetFileDir);  
	        if(flag) {  
	            System.out.println(">>>>>>解压成功<<<<<<");  
	        } else {  
	            System.out.println(">>>>>>解压失败<<<<<<");  
	        }  
	    }  
}