(Java) Extract a Single ZIP Entry While Preserving Its Stored Path

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This example demonstrates how to use the ZipEntry.Extract method to extract a single entry from a ZIP archive.

The example first creates a ZIP archive containing a text file. It then re-opens the ZIP, finds the entry, and extracts it to a base directory.

The Extract method uses the relative path stored within the ZIP entry. Any required subdirectories are created automatically beneath the specified base directory.

Note: This example requires Chilkat v11.0.0 or greater.

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import com.chilkatsoft.*;

public class ChilkatExample {

  static {
    try {
        System.loadLibrary("chilkat");
    } catch (UnsatisfiedLinkError e) {
      System.err.println("Native code library failed to load.\n" + e);
      System.exit(1);
    }
  }

  public static void main(String argv[])
  {
    boolean success = false;

    // ------------------------------------------------------------
    // First create a sample ZIP archive containing a small text file.

    CkZip zip = new CkZip();

    success = zip.NewZip("c:/temp/sampleText.zip");
    if (success == false) {
        System.out.println(zip.lastErrorText());
        return;
        }

    // Add a small text file from memory.
    success = zip.AddString("myApp/docs/hello.txt","Hello from a ZIP entry!","utf-8");
    if (success == false) {
        System.out.println(zip.lastErrorText());
        return;
        }

    // Write the ZIP archive to disk and close it.
    success = zip.WriteZipAndClose();
    if (success == false) {
        System.out.println(zip.lastErrorText());
        return;
        }

    // ------------------------------------------------------------
    // Now open the ZIP archive we just created.

    CkZip zip2 = new CkZip();

    success = zip2.OpenZip("c:/temp/sampleText.zip");
    if (success == false) {
        System.out.println(zip2.lastErrorText());
        return;
        }

    // Find the entry by its stored ZIP path.
    CkZipEntry entry = new CkZipEntry();

    success = zip2.EntryOf("myApp/docs/hello.txt",entry);

    if (success == false) {
        System.out.println("Entry not found.");
        return;
        }

    // Extract this single entry to the base directory:
    // 
    //     c:/temp/extracted
    // 
    // Because the entry's stored path is:
    // 
    //     myApp/docs/hello.txt
    // 
    // the file will be extracted to:
    // 
    //     qa_output/extracted/myApp/docs/hello.txt
    // 
    // The required subdirectories are created automatically.
    success = entry.Extract("c:/temp/extracted");
    if (success == false) {
        System.out.println(entry.lastErrorText());
        return;
        }

    zip2.CloseZip();

    System.out.println("Entry extracted successfully.");
  }
}