/**
* Copyright 2015 Google Inc. All Rights Reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS-IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.google.apphosting.tests.usercode.testservlets;
import java.io.IOException;
import java.io.File;
import java.io.RandomAccessFile;
import java.nio.ByteBuffer;
import java.nio.channels.ByteChannel;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.ServletException;
/**
* Demonstrates use of {@link FileChannel}.
*
*/
public class FileReadingNioServlet extends HttpServlet {
@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
String indexHtmlPath = getServletContext().getRealPath("index.html");
File indexHtml = new File(indexHtmlPath);
RandomAccessFile raf = new RandomAccessFile(indexHtml, "r");
ByteChannel channel = raf.getChannel();
ByteBuffer buffer = ByteBuffer.allocate(8192);
while (channel.read(buffer) != -1) {
buffer.flip();
int len = buffer.remaining();
byte[] bytes = new byte[len];
buffer.get(bytes);
buffer.flip();
response.getOutputStream().write(bytes, 0, len);
}
channel.close();
}
}
