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