java - zip, unzip

 
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.List;
import java.util.zip.ZipEntry;
import java.util.zip.ZipInputStream;
import java.util.zip.ZipOutputStream;
 
import com.google.common.collect.Lists;
 
public class ZipUtil {
  public static void zip(String zipFileName, List<File> files) throws IOException {
    byte[] buf = new byte[1024];
 
    ZipOutputStream out = new ZipOutputStream(new FileOutputStream(zipFileName));
    try {
 
      for (int i = 0; i < files.size(); i++) {
        FileInputStream in = new FileInputStream(files.get(i));
        try {
          String fileName = files.get(i).getAbsolutePath();
 
          ZipEntry ze = new ZipEntry(fileName);
          out.putNextEntry(ze);
 
          int len;
          while ((len = in.read(buf)) > 0) {
            out.write(buf, 0, len);
          }
          out.closeEntry();
        } finally {
          in.close();
        }
      }
    } finally {
      if (out != null) {
        out.close();
      }
    }
  }
 
  public static List<String> unzip(String zipFilePath, String destDir) throws IOException {
    File dir = new File(destDir);
    if (!dir.exists()) {
      dir.mkdirs();
    }
    byte[] buffer = new byte[1024];
    FileInputStream fis = null;
    ZipInputStream zis = null;
    ZipEntry ze = null;
    List<String> fileList = Lists.newArrayList();
    try {
      fis = new FileInputStream(zipFilePath);
      zis = new ZipInputStream(fis);
      ze = zis.getNextEntry();
      while (ze != null) {
        String fileName = ze.getName();
        File newFile = new File(destDir + File.separator + fileName);
        fileList.add(fileName);
        if (ze.isDirectory()) {
          newFile.mkdirs();
        } else {
          FileOutputStream fos = new FileOutputStream(newFile);
          int len;
          while ((len = zis.read(buffer)) > 0) {
            fos.write(buffer, 0, len);
          }
          fos.close();
        }
        zis.closeEntry();
        ze = zis.getNextEntry();
      }
      zis.closeEntry();
      zis.close();
    } finally {
      if (fis != null) {
        fis.close();
      }
    }
    return fileList;
  }
}