checkediotest.java

java tutorial.sun公司官方出品。java入门书籍。最新版

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 * Copyright (c) 1995 - 2008 Sun Microsystems, Inc.  All rights reserved.
 *
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 * modification, are permitted provided that the following conditions
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 *
 *   - 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 Sun Microsystems 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
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */ 

import java.io.*;

public class CheckedIOTest {
    public static void main(String[] args) throws IOException {

       Adler32 inChecker = new Adler32();
       Adler32 outChecker = new Adler32();
       CheckedInputStream in = null;
       CheckedOutputStream out = null;

       try {
           in = new CheckedInputStream(
			   new FileInputStream("farrago.txt"),
			   inChecker);
           out = new CheckedOutputStream(
			    new FileOutputStream("outagain.txt"),
			    outChecker);
       } catch (FileNotFoundException e) {
           System.err.println("CheckedIOTest: " + e);
           System.exit(-1);
       } catch (IOException e) {
           System.err.println("CheckedIOTest: " + e);
           System.exit(-1);
       }

       int c;

       while ((c = in.read()) != -1)
          out.write(c);

       System.out.println("Input stream check sum: " +
			  inChecker.getValue());
       System.out.println("Output stream check sum: " +
			  outChecker.getValue());

       in.close();
       out.close();
    }
}