java 內存里壓縮和解壓縮zip 文件

java 內存里壓縮和解壓縮zip 文件

java uncompress/compress a zip file in memory

在文件系統之上的壓縮和解壓縮沒太多說的，網絡上有大量的資料

目前基於nifi做功能性的processor開發，涉及對zip文件的解壓和壓縮

通常解壓和壓縮功能依賴文件系統

為提高實時性，減少cpu壓力，同時避免對磁盤的損耗，需要在內存里實現對zip文件的解壓和壓縮

個人從nifi源碼里找到了在內存內解壓縮的示例
https://github.com/apache/nifi/blob/ea9b0db2f620526c8dd0db595cf8b44c3ef835be/nifi-nar-bundles/nifi-standard-bundle/nifi-standard-processors/src/main/java/org/apache/nifi/processors/standard/MergeContent.java

並做了示例回答
https://stackoverflow.com/questions/23612864/create-a-zip-file-in-memory

public byte[] compressZip(ByteArrayOutputStream baos,String entryName) throws IOException {
    try (final ByteArrayOutputStream zipBaos = new ByteArrayOutputStream();
         final java.util.zip.ZipOutputStream out = new ZipOutputStream(zipBaos)) {
        final ZipEntry zipEntry = new ZipEntry(entryName);
        zipEntry.setSize(baos.size());
        out.putNextEntry(zipEntry);
        IOUtils.copy(new ByteArrayInputStream(baos.toByteArray()), out);
        out.closeEntry();
        out.finish();
        out.flush();
        return zipBaos.toByteArray();
    }
}

相關資料

http://commons.apache.org/proper/commons-compress/examples.html

http://commons.apache.org/proper/commons-compress/zip.html