●プログラム・リスト●

package jp.tuyano;

import java.io.IOException;
import java.net.URL;
import java.util.*;

import javax.jdo.*;
import javax.servlet.ServletException;
import javax.servlet.http.*;

public class AddMsgDataServlet extends HttpServlet {
	private static final long serialVersionUID = 1L;

	@Override
	protected void doGet(HttpServletRequest req,
			HttpServletResponse resp)
			throws ServletException, IOException {
		resp.setContentType("text/plain");
		resp.getWriter().println("no url...");
	}

	@Override
	protected void doPost(HttpServletRequest req,
			HttpServletResponse resp)
			throws ServletException, IOException {
		req.setCharacterEncoding("UTF-8");
		long id = Long.parseLong(req.getParameter("id"));
		String message = req.getParameter("message");
		Date date = Calendar.getInstance().getTime();
		PersistenceManagerFactory factory = PMF.get();
		PersistenceManager manager = factory.getPersistenceManager();
		LinkData linkdata = (LinkData)manager.getObjectById(LinkData.class,id);
		MsgData data = new MsgData(linkdata,message,date);
		List<MsgData> msgdatas = linkdata.getMsgDatas();
		msgdatas.add(data);
		linkdata.setMsgDatas(msgdatas);
		try {
			manager.makePersistent(data);
		} finally {
			manager.close();
		}
		resp.sendRedirect("/index.html");
	}
}