ZipCat.java

/*
 * Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 *   - Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 *
 *   - Redistributions in binary form must reproduce the above copyright
 *     notice, this list of conditions and the following disclaimer in the
 *     documentation and/or other materials provided with the distribution.
 *
 *   - Neither the name of Oracle nor the names of its
 *     contributors may be used to endorse or promote products derived
 *     from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
 * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR
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 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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/*
 * This source code is provided to illustrate the usage of a given feature
 * or technique and has been deliberately simplified. Additional steps
 * required for a production-quality application, such as security checks,
 * input validation, and proper error handling, might not be present in
 * this sample code.
 */

import java.io.IOException;
import java.io.InputStream;
import java.nio.file.FileSystem;
import java.nio.file.FileSystems;
import java.nio.file.Files;
import java.nio.file.Paths;

/**
 * Prints data of the specified file to standard output from a zip archive.
 */
public class ZipCat {

    /**
     * The main method for the ZipCat program. Run the program with an empty
     * argument list to see possible arguments.
     *
     * @param args the argument list for ZipCat
     */
    public static void main(String[] args) {
        if (args.length != 2) {
            System.out.println("Usage: ZipCat zipfile fileToPrint");
        }
        /*
         * Creates AutoCloseable FileSystem and BufferedReader.
         * They will be closed automatically after the try block.
         * If reader initialization fails, then zipFileSystem will be closed
         * automatically.
         */
        try (FileSystem zipFileSystem
                = FileSystems.newFileSystem(Paths.get(args[0]),null);
                InputStream input
                = Files.newInputStream(zipFileSystem.getPath(args[1]))) {
                    byte[] buffer = new byte[1024];
                    int len;
                    while ((len = input.read(buffer)) != -1) {
                        System.out.write(buffer, 0, len);
                    }

        } catch (IOException e) {
            e.printStackTrace();
            System.exit(1);
        }
    }
}