java-io

I have the below code got from mkyong, to zip files on local. But, my requirement is to zip files on server and need to download that. Could any one help. code wrote to zipFiles: public void zipFiles(File contentFile, File navFile) { byte[] buffer = new byte[1024]; try{ // i dont have idea on what to give here in fileoutputstream FileOutputStream fos = new FileOutputStream("C:\\MyFile.zip"); ZipOutputStream zos = new ZipOutputStream(fos); ZipEntry ze= new ZipEntry(contentFile.toString()); zos.putNextEntry(ze); FileInputStream in = new FileInputStream(contentFile.toString()); int len; while (

Ok, say I have a text file called "people.txt", and it contains the following information: 1 adam 20 M 2 betty 49 F 3 charles 9 M 4 david 22 M 5 ethan 41 M 6 faith 23 F 7 greg 22 M 8 heidi 63 F Basically, the first number is the ID of the person, then comes the person's name, age and gender. Say I want to replace line 2, or the person with ID number 2 with different values. Now, I know I cant use RandomAccessFile for this because the names are not always the same number of bytes, neither are the ages. While searching random Java forums, I found that StringBuilder or StringBuffer should suffice

I have a batch process running under java JDK 1.7. It is running on a system with RHEL, 2.6.18-308.el5 #1 SMP. This process gets a list of metadata objects from a database. From this metadata it extracts a path to a file. This file may or may not actually exist. The process uses the ExecutorService ( Executors.newFixedThreadPool() ) to launch multiple threads. Each thread runs a Callable that launches a process that reads that file and writes another file if that input file exists (and logs the result) and does nothing if the file does not exist (except log that result). I find the behavior is

I am using hadoop 1.2.1, hbase 0.94.14 and hive 1.0.0. There are three datanodes in my clsuter and three regionservers also. I have to import some data from hbase to hive. I have configured hive successfully but when I ran a command to count no. of rows in hive table, its gives following ERROR [main]: exec.Task (SessionState.java:printError(833)) - Job Submission failed with exception 'java.lang.RuntimeException(java.io.IOException: Merging of credentials not supported in this version of hadoop)' java.lang.RuntimeException: java.io.IOException: Merging of credentials not supported in this

Greetings , I get huge number of records from database and write into a file.I was wondering what the best way to write huge files. (1Gb - 10Gb). Currently I am using BufferedWriter BufferedWriter mbrWriter=new BufferedWriter(new FileWriter(memberCSV)); while(done){ //do writings } mbrWriter.close(); If you really insist using Java for this, then the best way would be to write immediately as soon as the data comes in and thus not to collect all the data from ResultSet into Java's memory first. You would need at least that much of free memory in Java otherwise. Thus, do e.g. while (resultSet

I have a simple text file and for some reason, it cannot be found. I don't see anything wrong with the code because I got it from a site, and I am starting to think that I didn't place the text file in the right place. Any suggestion please? Code: import java.io.BufferedReader; import java.io.File; import java.io.FileReader; import java.io.IOException; import java.util.ArrayList; import java.nio.file.Path; import java.nio.file.Paths; public class MainFavorites { public static void main(String[] args) throws IOException { /** * finds pathway to the file */ // File file = new File(

I am trying to simulate asymmetric key system. I use following code to generate key pairs, encrypt, decrypt passwords. I have a distributed environment and for the moment I save the keys generated in a file system. I know that is not secure but its just for testing purposes. private static SecureRandom random = new SecureRandom(); static { Security.addProvider(new org.bouncycastle.jce.provider.BouncyCastleProvider()); } protected synchronized void generateKeys() throws InvalidKeyException, IllegalBlockSizeException, BadPaddingException, NoSuchAlgorithmException, NoSuchProviderException,