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DynamicJasper (DJ) is an API that hides the complexity of Jasper Reports, it helps developers to save time when designing simple/medium complexity reports generating the layout of the report elements automatically. It creates reports dynamically, defining at runtime the columns, column width (auto width), groups, variables, fonts, charts, crosstabs, sub reports (that can also be dynamic), page size and everything else that you can define at design time. DJ keeps full compatibility with Jasper Reports since it's a tool that helps create reports programmatically in a easy way (it only interferes with the creation of the report design doing the layout of the elements). You can use the classic .jrxml files as templates while the content and layout of the report elements are handled by the DJ API. http://dynamicjasper.com

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package ar.com.fdvs.dj.util;

	import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;

	/**
 * Provides utility methods for input and output streams.
 *
 * @author Richard Wan
 * copied from log4j StreamUtils class
 */

// Contributed by ThoughtWorks Inc.

public abstract class StreamUtils {
  //--------------------------------------------------------------------------
  //   Constants:
  //--------------------------------------------------------------------------

  /**
   * Default value is 2048.
   */
  public static final int DEFAULT_BUFFER_SIZE = 2048;


  /**
   * Copies information from the input stream to the output stream using
   * a default buffer size of 2048 bytes.
   * @throws java.io.IOException
   */
  public static void copy(InputStream input, OutputStream output)
      throws IOException {
    copy(input, output, DEFAULT_BUFFER_SIZE);
  }

  /**
   * Copies information from the input stream to the output stream using
   * the specified buffer size
   * @throws java.io.IOException
   */
  public static void copy(InputStream input,
      OutputStream output,
      int bufferSize)
      throws IOException {
    byte[] buf = new byte[bufferSize];
    int bytesRead = input.read(buf);
    while (bytesRead != -1) {
      output.write(buf, 0, bytesRead);
      bytesRead = input.read(buf);
    }
    output.flush();
  }

  /**
   * Copies information between specified streams and then closes
   * both of the streams.
   * @throws java.io.IOException
   */
  public static void copyThenClose(InputStream input, OutputStream output)
      throws IOException {
    copy(input, output);
    input.close();
    output.close();
  }

  /**
   * @returns a byte[] containing the information contained in the
   * specified InputStream.
   * @throws java.io.IOException
   */
	  public static byte[] getBytes(InputStream input)
	      throws IOException {
	    ByteArrayOutputStream result = new ByteArrayOutputStream();
	    copy(input, result);
	    result.close();
	    return result.toByteArray();
	  }

}