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POHow to read zip file as byte array and then convert the byte array to back to zip file?
 

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  1. POHow to read zip file as byte array and then convert the byte array to back to zip file?
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    <p>I have tried using this code for converting a ZIP file to a byte array:</p> <pre><code>private static byte[] readZipFile(String zipFnm) // read in fnm, returning it as a single string { FileInputStream fileInputStream=null; File file = new File(zipFnm); byte[] bFile = new byte[(int) file.length()]; try{ //convert file into array of bytes fileInputStream = new FileInputStream(zipFnm); fileInputStream.read(bFile); fileInputStream.close(); }catch(Exception e){ e.printStackTrace(); } return bFile; } </code></pre> <p>and this code for converting the byte array to back to ZIP, by calling <code>writeByteToZip(fnm + ".zip");</code></p> <pre><code>private static String writeByteToZip(String outFnm) { try { FileOutputStream fileOuputStream = new FileOutputStream(outFnm); fileOuputStream.write(bFile); fileOuputStream.close(); } catch ( IOException iox ){ iox.printStackTrace(); } return outFnm; } // end of writeByteToZip() </code></pre> <p>What am I doing wrong? I get correct byte length of zip using </p> <pre><code>byte[] bzip = readZipFile(zipFnm); int totalLen1 = bzip.length; System.out.println("Total byte length of zip: " + totalLen1); </code></pre> <p>All I get is a zero size zip file and run time error in Netbeans as:</p> <pre><code>Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException at java.io.FileOutputStream.write(FileOutputStream.java:305) at steg.Steg.writeByteToZip(Steg.java:402) at steg.Steg.save(Steg.java:292) at steg.frame1.jButton2ActionPerformed(frame1.java:349) at steg.frame1.access$300(frame1.java:24) at steg.frame1$4.actionPerformed(frame1.java:172) at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2018) at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2341) at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:402) at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:259) at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:252) at java.awt.Component.processMouseEvent(Component.java:6505) at javax.swing.JComponent.processMouseEvent(JComponent.java:3321) at java.awt.Component.processEvent(Component.java:6270) at java.awt.Container.processEvent(Container.java:2229) at java.awt.Component.dispatchEventImpl(Component.java:4861) at java.awt.Container.dispatchEventImpl(Container.java:2287) at java.awt.Component.dispatchEvent(Component.java:4687) at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4832) at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4492) at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4422) at java.awt.Container.dispatchEventImpl(Container.java:2273) at java.awt.Window.dispatchEventImpl(Window.java:2713) at java.awt.Component.dispatchEvent(Component.java:4687) at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:707) at java.awt.EventQueue.access$000(EventQueue.java:101) at java.awt.EventQueue$3.run(EventQueue.java:666) at java.awt.EventQueue$3.run(EventQueue.java:664) at java.security.AccessController.doPrivileged(Native Method) at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76) at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:87) at java.awt.EventQueue$4.run(EventQueue.java:680) at java.awt.EventQueue$4.run(EventQueue.java:678) at java.security.AccessController.doPrivileged(Native Method) at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76) at java.awt.EventQueue.dispatchEvent(EventQueue.java:677) at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:211) at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:128) at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:117) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:113) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:105) at java.awt.EventDispatchThread.run(EventDispatchThread.java:90) </code></pre>
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      1. POHow to read zip file as byte array and then convert the byte array to back to zip file?
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