java编程笔记18文件压缩与解压缩

package com.book.ch09.file;import java.io.File;
import java.io.FileFilter;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.zip.ZipEntry;
import java.util.zip.ZipOutputStream;public class CompressFile {public static void addFile(ZipOutputStream zipOutput, File file) throws IOException{System.out.println("正在添加文件&＃xff1a;" &＃43; file.getAbsolutePath());// 每个压缩对象都为一个 ZipEntry 实例。ZipEntry zipEntry &＃61; new ZipEntry(file.getName());// 将这个实例放入压缩文件中zipOutput.putNextEntry(zipEntry);// 读取文件内容FileInputStream ins &＃61; new FileInputStream(file);byte[] tmp &＃61; new byte[1024];int len &＃61; 0;while((len &＃61; ins.read(tmp)) !&＃61; -1){zipOutput.write(tmp, 0, len);}ins.close();// 关闭当前的 ZipEntry 实例zipOutput.closeEntry();}public static void main(String[] args) throws IOException{File sourceFolder &＃61; new File("D:\\常用软件");File targetFile &＃61; new File("D:\\zip_test.zip");// 使用 ZipOutputStream 创建压缩文件ZipOutputStream zipOutput &＃61; new ZipOutputStream(new FileOutputStream(targetFile));// 列出该文件夹下所有的文件File[] subFiles &＃61; sourceFolder.listFiles(new FileFilter(){public boolean accept(File pathname) {if(pathname.isFile()) return true;return false;}});System.out.println("\r\n文件压缩开始&＃xff1a;" &＃43;sourceFolder.getAbsolutePath()&＃43;"\n\n");for(int i&＃61;0; i

package com.book.ch09.file;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.ZipInputStream;public class UncompressFile {static int count &＃61; 0;public static void extractFile(File path, ZipInputStream zipIns, ZipEntry zipEntry) throws IOException{File file &＃61; new File(path, zipEntry.getName());System.out.println("正在释放文件&＃xff1a;" &＃43; file.getAbsolutePath());FileOutputStream ous &＃61; new FileOutputStream(file);byte[] tmp &＃61; new byte[1024];int len &＃61; 0;while((len &＃61; zipIns.read(tmp)) !&＃61; -1){ous.write(tmp, 0, len);}ous.close();zipIns.closeEntry();count&＃43;&＃43;;}public static void main(String[] args) throws IOException{File sourceZipFile &＃61; new File("c:\\zip_test.zip");File targetFolder &＃61; new File("C:\\zip_test");targetFolder.mkdir();ZipInputStream zipIns &＃61; new ZipInputStream(new FileInputStream(sourceZipFile));ZipEntry zipEntry &＃61; zipIns.getNextEntry();while(zipEntry !&＃61; null){extractFile(targetFolder, zipIns, zipEntry);zipEntry &＃61; zipIns.getNextEntry();}zipIns.close();System.out.println("\r\n文件释放完成。" &＃43; count &＃43; " 个文件被释放。");}}