How Can I Efficiently Append Files to ZIP Archives in Java?

Appending Files to ZIP Files in Java

Efficient Method for War File Modification

Extracting war file contents, adding new files, and recompressing creates unnecessary wait times during development. Appending files directly to the ZIP archive can enhance efficiency.

Java 7's Zip File System

Java 7 introduces a powerful feature through Zip File System. It enables seamless addition and modification of files within ZIP archives (including JAR and WAR files) without recompression.

Code Example

The following Java code demonstrates how to append a new file to a ZIP archive using Zip File System:

Map<String, String> env = new HashMap<>();
env.put("create", "true");
Path path = Paths.get("test.zip");
URI uri = URI.create("jar:" + path.toUri());
try (FileSystem fs = FileSystems.newFileSystem(uri, env)) {
    Path nf = fs.getPath("new.txt");
    try (Writer writer = Files.newBufferedWriter(nf, StandardCharsets.UTF_8, StandardOpenOption.CREATE)) {
        writer.write("hello");
    }
}

This code creates a new file named "new.txt" within the "test.zip" archive.

TruZip Alternative

While Zip File System is an effective solution, it's worth exploring alternative libraries like TruZip. TrueZip provides additional features and optimizations for ZIP file manipulation. Both Zip File System and TrueZip offer efficient methods for appending files to ZIP archives in Java.

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