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/* Get CRC-32 Checksum of Zip Entry Example This Java example shows how to get CRC-32 checksum of zip entry using getCrc method of Java ZipEntry class. */ import java.io.IOException; import java.util.Enumeration; import java.util.zip.ZipEntry; import java.util.zip.ZipFile; public class GetCRC32Checksum { public static void main(String args[]) { try { /* * To Open a zip file, use * * ZipFile(String fileName) * constructor of the ZipFile class. * * This constructor throws IOException for any I/O error. */ ZipFile zipFile = new ZipFile("c:/FileIO/WebFiles.zip"); /* * Get list of zip entries using entries method of * ZipFile class. */ Enumeration e = zipFile.entries(); System.out.print("File Name"); System.out.print("ttttCRC-32 Checksum"); System.out.print("n---------------------------------n"); while(e.hasMoreElements()) { ZipEntry entry = (ZipEntry)e.nextElement(); /* * To get CRC-32 checksum of an entry, use * * long getCrc() * method of Java ZipEntry class. * * This method returns the CRC checksum for a particular * zip entry, or -1 if not known. */ String entryName = entry.getName(); long crc = entry.getCrc(); System.out.print(entryName); System.out.print("tttt" + crc); System.out.print("n"); } /* * close the opened zip file using, * void close() * method. */ zipFile.close(); } catch(IOException ioe) { System.out.println("Error opening zip file" + ioe); } } } /* Output of this program would be File Name CRC-32 Checksum --------------------------------- css/datagrid.css 995618961 css/graph.css 2675857370 jsps/Masthead.jspf 1211369105 jsps/Welcome.jsp 665174626 */ |
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