用java实现zip压缩

本来是写到spaces live上的，可是代码的显示效果确实不怎么好看。在javaeye上试了试代码显示的顺眼多了。

今天写了个用java压缩的功能，可以实现对文件和目录的压缩。

由于java.util.zip.ZipOutputStream有中文乱码问题，所以采用org.apache.tools.zip.ZipOutputStream。
以下是代码：

package net.szh.zip;

import java.io.BufferedInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.util.zip.CRC32;
import java.util.zip.CheckedOutputStream;

import org.apache.tools.zip.ZipEntry;
import org.apache.tools.zip.ZipOutputStream;

public class ZipCompressor {
	static final int BUFFER = 8192;

	private File zipFile;

	public ZipCompressor(String pathName) {
		zipFile = new File(pathName);
	}

	public void compress(String srcPathName) {
		File file = new File(srcPathName);
		if (!file.exists())
			throw new RuntimeException(srcPathName + "不存在！");
		try {
			FileOutputStream fileOutputStream = new FileOutputStream(zipFile);
			CheckedOutputStream cos = new CheckedOutputStream(fileOutputStream,
					new CRC32());
			ZipOutputStream out = new ZipOutputStream(cos);
			String basedir = "";
			compress(file, out, basedir);
			out.close();
		} catch (Exception e) {
			throw new RuntimeException(e);
		}
	}

	private void compress(File file, ZipOutputStream out, String basedir) {
		/* 判断是目录还是文件 */
		if (file.isDirectory()) {
			System.out.println("压缩：" + basedir + file.getName());
			this.compressDirectory(file, out, basedir);
		} else {
			System.out.println("压缩：" + basedir + file.getName());
			this.compressFile(file, out, basedir);
		}
	}

	/** 压缩一个目录 */
	private void compressDirectory(File dir, ZipOutputStream out, String basedir) {
		if (!dir.exists())
			return;

		File[] files = dir.listFiles();
		for (int i = 0; i < files.length; i++) {
			/* 递归 */
			compress(files[i], out, basedir + dir.getName() + "/");
		}
	}

	/** 压缩一个文件 */
	private void compressFile(File file, ZipOutputStream out, String basedir) {
		if (!file.exists()) {
			return;
		}
		try {
			BufferedInputStream bis = new BufferedInputStream(
					new FileInputStream(file));
			ZipEntry entry = new ZipEntry(basedir + file.getName());
			out.putNextEntry(entry);
			int count;
			byte data[] = new byte[BUFFER];
			while ((count = bis.read(data, 0, BUFFER)) != -1) {
				out.write(data, 0, count);
			}
			bis.close();
		} catch (Exception e) {
			throw new RuntimeException(e);
		}
	}
}

后来发现原来可以用ant中的org.apache.tools.ant.taskdefs.Zip来实现，更加简单。

package net.szh.zip;

import java.io.File;

import org.apache.tools.ant.Project;
import org.apache.tools.ant.taskdefs.Zip;
import org.apache.tools.ant.types.FileSet;

public class ZipCompressorByAnt {

	private File zipFile;

	public ZipCompressorByAnt(String pathName) {
		zipFile = new File(pathName);
	}
	
	public void compress(String srcPathName) {
		File srcdir = new File(srcPathName);
		if (!srcdir.exists())
			throw new RuntimeException(srcPathName + "不存在！");
		
		Project prj = new Project();
		Zip zip = new Zip();
		zip.setProject(prj);
		zip.setDestFile(zipFile);
		FileSet fileSet = new FileSet();
		fileSet.setProject(prj);
		fileSet.setDir(srcdir);
		//fileSet.setIncludes("**/*.java"); 包括哪些文件或文件夹 eg:zip.setIncludes("*.java");
		//fileSet.setExcludes(...); 排除哪些文件或文件夹
		zip.addFileset(fileSet);
		
		zip.execute();
	}
}

测试一下

package net.szh.zip;

public class TestZip {
	public static void main(String[] args) {
		ZipCompressor zc = new  ZipCompressor("E:\\szhzip.zip");
		zc.compress("E:\\test");
		
		ZipCompressorByAnt zca = new ZipCompressorByAnt("E:\\szhzipant.zip");
		zca.compress("E:\\test");
	}
}