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POUnable to Write Contents of Jar File to Local Servlet on Tomcat 7.0.22
 

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  1. POUnable to Write Contents of Jar File to Local Servlet on Tomcat 7.0.22
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    <p>Good Afternoon,</p> <p>I am trying to extract the contents of a jar file programmatically and found a code snippet <a href="http://www.devx.com/tips/Tip/22124" rel="nofollow">here</a> which has allowed me to extract the contents of a jar file on my local machine without the use of a servlet. </p> <p>Now that I know the code works I am trying to use it in a local servlet environment, specifically Tomcat 7.0.22. So far I have the code below but have been unable to output the contents of the jar. I believe that I am not handling the output stream correctly and that is why nothing is saved to the local directory of my local Tomcat server. </p> <p>Would anyone be able to point me in the right direction or offer some advice on how to correct the code so that it outputs the contents read to a file?</p> <pre><code>import java.io.*; import java.util.*; import javax.servlet.*; @SuppressWarnings("serial") public class JarExtractor extends HttpServlet { @SuppressWarnings("rawtypes") protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { try { String path = getServletContext().getRealPath("test.jar"); JarFile jar = new JarFile(path); Enumeration jarEnum = jar.entries(); while (jarEnum.hasMoreElements()) { JarEntry file = (JarEntry) jarEnum.nextElement(); File f = new File(file.getName()); if (file.isDirectory()) { // if its a directory, create it f.mkdir(); continue; } InputStream in = jar.getInputStream(file); // get the input stream OutputStream output = new FileOutputStream(f); while (in.available() &gt; 0) { // write contents of 'is' to 'fos' output.write(in.read()); } output.close(); in.close(); } } catch(Exception ex) { //------ } } public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { try { doPost(request,response); } catch (ServletException e) { // } catch (IOException e) { // } } </code></pre> <p>}</p> <p>Thank you very much for any help anyone is able to provide.</p> <p>Enjoy your weekend!</p>
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    1. USkevintcoughlin
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    1. COWhat actually happens? Do you have write access to wherever you're trying to write to? Do you even know where you're writing to?
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      1. USDave Newton
    2. CONothing happens, when I was running the code with println's it would print up until I would initialize the output stream and then nothing more. I believe that I have write permissions because I am running Tomcat locally and have a servlet that uploads and saves files that works fine. I am writing to ~/(tomcat-dir)/wtpwebapps/APP-NAME right now. The 'test.jar' file is located in ~/wtpwebapps/APP-NAME
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      1. USkevintcoughlin
    3. COYour code does not make sense. It seems to me that you try to write all entries found in the JAR file back to its originating location. What exactly do you want to achieve - read an existing JAR and...?
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