Java

Unzip a Text File Entry into a StringBuilder Using ZipEntry.UnzipToSb

See more Zip Examples

This example demonstrates how to use the ZipEntry.UnzipToSb method to inflate a text file entry directly into a StringBuilder object.

The ZIP entry is uncompressed entirely in memory and appended to the StringBuilder without creating a temporary file on disk.

This is useful when:

• Processing text files directly in memory
• Avoiding temporary filesystem files
• Reading configuration files, JSON, XML, CSV, or source code from ZIP archives
• Automatically converting line endings while inflating the text

The srcCharset argument specifies how the uncompressed bytes should be interpreted, such as:

• utf-8
• utf-16
• windows-1252

The lineEndingBehavior argument controls line-ending conversion:

• 0 — Leave line endings unchanged
• 1 — Convert all line endings to bare LF
• 2 — Convert all line endings to CRLF

Suppose the ZIP archive contains:

config/settings.json

The example inflates the JSON file directly into a StringBuilder.

Chilkat2 Java

import com.chilkatsoft.chilkat2.ChilkatException;
import com.chilkatsoft.chilkat2.StringBuilder;
import com.chilkatsoft.chilkat2.Zip;
import com.chilkatsoft.chilkat2.ZipEntry;

public class ChilkatExample {

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

        Zip zip = new Zip();

        // Open an existing ZIP archive.
        try {
            zip.openZip("qa_data/zips/configFiles.zip");
        } catch (ChilkatException e) {
            System.out.println(e.getLastErrorText());
            return;
        }

        // Locate the JSON file entry within the ZIP archive.
        ZipEntry entry = new ZipEntry();

        success = zip.entryOf("config/settings.json", entry);
        if (!success) {
            System.out.println("ZIP entry not found.");
            zip.closeZip();
            return;
        }

        // ------------------------------------------------------------
        // Inflate the ZIP entry directly into a StringBuilder.
        //
        // The uncompressed text is appended to the StringBuilder.
        //
        StringBuilder sb = new StringBuilder();

        // Leave line endings unchanged.
        int lineEndingBehavior = 0;

        // Interpret the uncompressed bytes as UTF-8 text.
        String srcCharset = "utf-8";

        try {
            entry.unzipToSb(lineEndingBehavior, srcCharset, sb);
        } catch (ChilkatException e) {
            System.out.println(e.getLastErrorText());
            return;
        }

        System.out.println("Uncompressed text:");
        System.out.println("");
        System.out.println(sb.getAsString());

        zip.closeZip();

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