Java

Get Compressed ZIP Entry Data as Base64 Using ZipEntry.CopyToBase64

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This example creates a small ZIP archive containing a text file added from memory, writes the ZIP to disk, re-opens it, and then uses ZipEntry.CopyToBase64 to retrieve the compressed data for the text file as a Base64-encoded string.

The Base64 string returned by CopyToBase64 represents the compressed bytes stored for the entry inside the ZIP archive. It is not the original uncompressed text data.

Java

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.
    // The text is stored in the ZIP as "hello.txt".
    success = zip.AddString("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;
        }

    // Get the text file entry.
    CkZipEntry entry = new CkZipEntry();

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

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

    // Get the compressed ZIP entry data as Base64.
    // 
    // This is the compressed data stored inside the ZIP file,
    // not the uncompressed text "Hello from a ZIP entry!".
    String b64 = entry.copyToBase64();

    System.out.println("Base64 compressed ZIP entry data:");
    System.out.println(b64);

    zip2.CloseZip();

    System.out.println("Done.");
  }
}