递归压缩(ZipOutputStream )与ANT的zipAPI压缩比较

最近在一个项目里因涉及到大数据量的压缩，发现通用的递归压缩的效率比较慢，我在项目测试中对一个2G大小的文件进行压缩发现需要4个小时才能压缩完成，感觉效率比较慢，因此查找了一些资料，发现使用ant的zipAPI接口进行压缩可以大大提高压缩效率，并且代码更简洁，初步评估效率可提高15倍，下面是测试样例

import java.io.File;

import java.io.FileInputStream;

import java.io.FileNotFoundException;

import java.io.FileOutputStream;

import java.io.IOException;

import java.io.UnsupportedEncodingException;

import org.apache.tools.ant.Project;

import org.apache.tools.ant.taskdefs.*;

import org.apache.tools.zip.*;

public class ZipTest {

public void antZip(String src,String dest) {

Zip zip = new Zip();

try {

zip.setBasedir(new File(src));

Project p = new Project();

zip.setDestFile(new File(dest));

p.setBaseDir(new File(src));

zip.setProject(p);

zip.execute();

} catch (Exception e) {

// TODO Auto-generatedcatch block

e.printStackTrace();

}

}

public void commZip(String src, String dest) {

try {

FileOutputStream out = new FileOutputStream(new String(dest

.getBytes("gb2312")));

ZipOutputStream zOut = new ZipOutputStream(out);

zip(zOut, new File(src), "");

zOut.close();

} catch (FileNotFoundException e) {

// TODO Auto-generatedcatch block

e.printStackTrace();

} catch (UnsupportedEncodingException e) {

// TODO Auto-generatedcatch block

e.printStackTrace();

} catch (IOException e) {

// TODO Auto-generatedcatch block

e.printStackTrace();

} catch (Exception e) {

// TODO Auto-generatedcatch block

e.printStackTrace();

}

}

private void zip(ZipOutputStream zOut, File file, String base)

throws Exception {

if (file.isDirectory()) {

File[] listFiles = file.listFiles();

zOut.putNextEntry(new ZipEntry(base + "/"));

base = (base.length() == 0 ? "" : base + "/");

for (int i = 0; i < listFiles.length; i++) {

zip(zOut, listFiles[i], base + listFiles[i].getName());

}

} else {

if (base == "") {

base = file.getName();

}

zOut.putNextEntry(new ZipEntry(base));

FileInputStream in = new FileInputStream(file);

int len;

while ((len = in.read()) != -1) {

zOut.write(len);

}

in.close();

}

}

public static void main(String[] args) {

ZipTest zip=new ZipTest();

//ant zip

long start = System.currentTimeMillis();

zip.antZip("F:\\workspace\\idrs_yingji\\WebRoot\\WEB-INF\\classes",

"F:\\test.zip");

long end = System.currentTimeMillis();

System.out.println("ant zip 耗时::" + (end - start) / 1000);

//common zip

long start1 = System.currentTimeMillis();

zip.commZip("F:\\workspace\\idrs_yingji\\WebRoot\\WEB-INF\\classes",

"F:\\test1.zip");

long end1 = System.currentTimeMillis();

System.out.println("common zip 耗时::" + (end1 - start1) / 1000);

}

}

测试结果

ant zip 耗时::1

common zip 耗时::15

后面将项目的压缩方式改为ANT的接口后，对一个2G的目录进行压缩只用了不到3分钟，而之前需要4.5小时