Appending Files to ZIP in Java
Seeking an alternative to the conventional approach of extracting, modifying, and recreating war files, you're exploring the possibility of appending files directly to an existing war file.
Native Java Support
Java 7 introduced the Zip File System, which provides the ability to add and modify files in ZIP archives without the need for manual repackaging. Using this API, you can directly write to files within ZIP files, as showcased in the following code snippet:
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"); } }</string>
This method bypasses the time-consuming process of extracting and recompressing the war file, resulting in significant efficiency gains.
Third-Party Libraries
While Java's native support is effective, there are also third-party libraries that offer additional functionality, such as TrueZip. TrueZip provides a comprehensive set of features for working with ZIP files, including the ability to append files and extract their contents. Other notable libraries include:
- Zip4j: Supports file appending, encryption, and compression.
- Apache Commons Compress: A popular library for handling various compression formats, including ZIP.
- jZip: A lightweight library focused on ease of use for ZIP file manipulation.
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Platform independence reduces development costs and shortens development time by running the same set of code on multiple operating systems. Specifically, it is manifested as: 1. Reduce development time, only one set of code is required; 2. Reduce maintenance costs and unify the testing process; 3. Quick iteration and team collaboration to simplify the deployment process.

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Multithreading is important in modern programming because it can improve program responsiveness and resource utilization and handle complex concurrent tasks. JVM ensures the consistency and efficiency of multithreads on different operating systems through thread mapping, scheduling mechanism and synchronization lock mechanism.


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