java.util.zip.ZipOutputStream による ZIP アーカイブ 1

ZipArchive1.java

package sample;

import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.Collection;
import java.util.zip.ZipEntry;
import java.util.zip.ZipOutputStream;

import org.apache.commons.io.FileUtils;

public class ZipArchive1 {

    void archive(String dirPath) {
        ZipOutputStream zos = null;
        try {
            zos = new ZipOutputStream(new BufferedOutputStream(new FileOutputStream(dirPath + ".zip")));
            
            Collection<File> files = FileUtils.listFiles(new File(dirPath), null, true);
            writeZipEntry(zos, files.toArray(new File[] {}), dirPath);
            
        } catch (IOException e) {
            e.printStackTrace();
            
        } finally {
            if (zos != null) {
                try {
                    zos.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
    }
    
    void writeZipEntry(ZipOutputStream zos, File[] files, String dirPath) throws IOException {
        InputStream is = null;
        byte[] buf = new byte[1024];
        try {
            for (File file : files) {
                String entryPath = file.getAbsolutePath().substring(dirPath.length() + 1);
                ZipEntry entry = new ZipEntry(entryPath);
                zos.putNextEntry(entry);
                is = new BufferedInputStream(new FileInputStream(file));
                int len = 0;
                while ((len = is.read(buf)) != -1) {
                    zos.write(buf, 0, len);
                }
            }
            
        } finally {
            if (is != null) {
                try {
                    is.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
    }

}