●プログラム・リスト●

package com.tuyano.libro.mygaeapp;

import java.io.*;
import java.nio.ByteBuffer;
import java.nio.channels.Channels;

import javax.servlet.http.*;

import com.google.appengine.api.files.*;
import com.google.appengine.api.files.GSFileOptions.GSFileOptionsBuilder;

@SuppressWarnings("serial")
public class MyGaeAppServlet extends HttpServlet {
	public static final String BUCKETNAME = "my_cloud_data";
	public static final String FILENAME = "sample.data";

	public void doGet(HttpServletRequest request, 
			HttpServletResponse response)
			throws IOException {
		response.setContentType("text/plain");
		request.setCharacterEncoding("utf8");
		response.setCharacterEncoding("utf8");
		PrintWriter out = response.getWriter();
		String filename = "/gs/" + BUCKETNAME + "/" + FILENAME;
		FileService fileService = FileServiceFactory.getFileService();
		AppEngineFile readableFile = new AppEngineFile(filename);
		FileReadChannel readChannel = null;
		try {
			readChannel = fileService.
				openReadChannel(readableFile, true);
			ByteBuffer buffer = ByteBuffer.allocate(1024);
			readChannel.read(buffer);
			out.println(new String(buffer.array()));
		} catch(FileNotFoundException e){
			out.println("no file...");
		} finally {
			try {
				readChannel.close();
			} catch(Exception ex){}
		}
	}

	public void doPost(HttpServletRequest request, 
			HttpServletResponse response)
			throws IOException {
		response.setContentType("text/plain");
		request.setCharacterEncoding("utf8");
		response.setCharacterEncoding("utf8");
		String title = request.getParameter("title");
		String content = request.getParameter("content");
		FileService fileService = FileServiceFactory
				.getFileService();
		GSFileOptionsBuilder optionsBuilder = new GSFileOptionsBuilder()
				.setBucket(BUCKETNAME)
				.setKey(FILENAME)
				.setMimeType("binary/octet-stream")
				.setAcl("public_read");
		AppEngineFile file = fileService
				.createNewGSFile(optionsBuilder.build());
		FileWriteChannel writeChannel = fileService.openWriteChannel(file, true);
		String data = title + "\n\n" + content;
		ByteBuffer buffer = ByteBuffer.wrap(data.getBytes());
		writeChannel.write(buffer);
		writeChannel.closeFinally();
		response.sendRedirect("/helo.jsp");
	}

}