Java.util.zip.DataFormatException: unknown compression method

Question

I'm trying to decompress data from an oralce database into a file, but I'm getting error. Any assistance would be greatly appreciated .
package com.citi.blob;
import java.sql.*;
import java.io.*;
import java.util.zip.Inflater;
public class PullBlob {
     public static void main(String[] args) {
          // DB Connection info
          String userName="user";
          String passWord="password";
          //Production Database
          String dataBase="ABCD";
          //Production URL
          String url = "jdbc:oracle:thin:@111.2222.333.444:8080:" + dataBase;
          System.out.println("args length is" + args.length);
          // Sort out args
          if(args.length<2) {
               System.out.println("Usage: java PullBLOB product acctnum optional-out-file");
               System.exit(1);
          String product = args[0];
          String acctnum = args[1];
          String fileName = null;
          if(args.length>=3) {
               fileName = args[2];
          Connection con = null;
          try {
               // Establish connection
               Class.forName("oracle.jdbc.driver.OracleDriver");
               con = DriverManager.getConnection(url, userName, passWord);
               Statement stmt = con.createStatement();
               // Sort out the output stream
               boolean toFile=false;
               PrintWriter fout = null;
               if(fileName!=null) {
                    File file = new File(fileName);
                    FileOutputStream fos = new FileOutputStream(file);
                    fout = new PrintWriter(fos);
                    toFile = true;
               String query = "SELECT stm_cmp_xml FROM pld_stm WHERE prd_nm = 'JACKS_BOX' and act_num='9988556622'";
               System.out.println(query);
               ResultSet rs = stmt.executeQuery(query);
//                      System.out.println("Number of records fetchted " + rs.getFetchSize());
               if(rs.next()) {
                    //Blob xml = rs.getBlob("inv_cmp_xml");
                    Blob xml = rs.getBlob("stm_cmp_xml");
                    InputStream in = xml.getBinaryStream();
                    ByteArrayOutputStream byteStream = new ByteArrayOutputStream();
                    int data;
                    while ((data = in.read()) != -1) {
                         byteStream.write((byte)data);
                    byte[] compressedData = byteStream.toByteArray();
                    in.close();
                    Inflater decompressor = new Inflater();
                    decompressor.setInput(compressedData);
                    // Create an expandable byte array to hold the decompressed data
                    ByteArrayOutputStream bos = new ByteArrayOutputStream(compressedData.length);
                    // Decompress the data
                    //byte[] buf = new byte[TEMP_BUFFER_SIZE];
                    // use a 1 meg buffer for improved speed
                    byte [] buf = new byte[1048576];
                    while (!decompressor.finished()) {
                              int count = decompressor.inflate(buf);
                              bos.write(buf, 0, count);
                    buf=null;
                    bos.close();
                    //Get the decompressed data
                    byte[] decompressedData = bos.toByteArray();
                    String stmtXml = new String(decompressedData).trim();
                    if(toFile) {
                         fout.println(stmtXml);
                    else {
                         System.out.println(stmtXml);
                 else { // No result
                    System.out.println("Couldn't find stmt for " + acctnum );
               if(fout!=null) fout.close();
          catch(Exception e) {
               System.out.println(e.getMessage());
               e.printStackTrace();
          finally {
               try {
                    if(con!=null) con.close();
               catch(Exception e) {
                    // Whatever
}here is the output and error I receieve:
args length is3
SELECT stm_cmp_xml FROM pld_stm WHERE prd_nm = 'JACKS_BOX'  and act_num='9988556622'
unknown compression method
java.util.zip.DataFormatException: unknown compression method
     at java.util.zip.Inflater.inflateBytes(Native Method)
     at java.util.zip.Inflater.inflate(Unknown Source)
     at java.util.zip.Inflater.inflate(Unknown Source)
     at com.citi.blob.PullBlob.main(PullBlob.java:95)

Answer 1

Take a look at class ZipFile.
o Create one on your input.
o Get an enumeration of the entries - the headers for your files within the zip file.
o Ask for the input stream of the file you want.
o Read the data - it is unzipped for you.