JAVA实现压缩文件或文件夹

想到压缩一般大家会先想到rar，由于rar的压缩度高，但人家可是收费的。JAVA中如果要实现压缩一般都是用zip压缩。

首先，讲下压缩文件

import java.io.*; import java.util.zip.*;//ZipOutputStream这个流在这里 import java.util.*; public class ZipOutputStreamTest { public static void main(String[] args) throws Exception { File f = new File("a.jpg"); FileInputStream fis = new FileInputStream(f); BufferedInputStream bis = new BufferedInputStream(fis); byte[] buf = new byte[1024]; int len; FileOutputStream fos = new FileOutputStream(f.getName()+".zip"); BufferedOutputStream bos = new BufferedOutputStream(fos); ZipOutputStream zos = new ZipOutputStream(bos);//压缩包 ZipEntry ze = new ZipEntry(f.getName());//这是压缩包名里的文件名 zos.putNextEntry(ze);//写入新的 ZIP 文件条目并将流定位到条目数据的开始处 while((len=bis.read(buf))!=-1) { zos.write(buf,0,len); zos.flush(); } bis.close(); zos.close(); } }

压缩文件夹

import java.io.File; import org.apache.tools.zip.ZipOutputStream; //这个包在ant.jar里，要到官方网下载 import java.io.FileInputStream; import java.io.FileOutputStream; import java.util.zip.ZipInputStream; import java.util.zip.ZipEntry; public class CompressBook { public CompressBook() {} /**//* * inputFileName 输入一个文件夹 * zipFileName 输出一个压缩文件夹 */ public void zip(String inputFileName) throws Exception { String zipFileName = "c://test.zip"; //打包后文件名字 System.out.println(zipFileName); zip(zipFileName, new File(inputFileName)); } private void zip(String zipFileName, File inputFile) throws Exception { ZipOutputStream out = new ZipOutputStream(new FileOutputStream(zipFileName)); zip(out, inputFile, ""); System.out.println("zip done"); out.close(); } private void zip(ZipOutputStream out, File f, String base) throws Exception { if (f.isDirectory()) { File[] fl = f.listFiles(); out.putNextEntry(new org.apache.tools.zip.ZipEntry(base + "/")); base = base.length() == 0 ? "" : base + "/"; for (int i = 0; i < fl.length; i++) { zip(out, fl[i], base + fl[i].getName()); } }else { out.putNextEntry(new org.apache.tools.zip.ZipEntry(base)); FileInputStream in = new FileInputStream(f); int b; System.out.println(base); while ( (b = in.read()) != -1) { out.write(b); } in.close(); } } public static void main(String [] temp){ CompressBook book = new CompressBook(); try { book.zip("c://c");//你要压缩的文件夹 }catch (Exception ex) { ex.printStackTrace(); } } }

注意：内容的中文乱码问题，这个问题网上很多人给出了解决方法，

两种：修改sun的源码；使用开源的类库org.apache.tools.zip.ZipOutputStream和org.apache.tools.zip.ZipEntry，这两个类ant.jar中有，可以下载使用即可，毫无疑问，选择后者更方便