import java.io.*;
import java.util.*;
import javax.servlet.http.*;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.transform.OutputKeys;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Text;
public class GuestBookDom extends HttpServlet {
private static void appendNewline(Document doc, Element e) {
Text txt = doc.createTextNode("\n");
e.appendChild(txt);
}
private static Element createTableFromKeys(HttpServletRequest req, Document doc, Enumeration keys) {
Element tbl = doc.createElement("table");
tbl.setAttribute("border", "1");
appendNewline(doc, tbl);
while (keys.hasMoreElements()) {
Element row = doc.createElement("tr");
Element td1 = doc.createElement("td");
String left = (String)keys.nextElement();
td1.setTextContent(left);
row.appendChild(td1);
Element td2 = doc.createElement("td");
td2.setTextContent(req.getParameter(left));
row.appendChild(td2);
tbl.appendChild(row);
appendNewline(doc, tbl);
}
return tbl;
}
@Override
public void doPost(HttpServletRequest req, HttpServletResponse res)
throws IOException {
res.setContentType("text/html; charset=Windows-31J");
req.setCharacterEncoding("Windows-31J");
PrintWriter out = res.getWriter();
out.println("");
try {
// 読み込みの準備
String filename = getServletContext().getRealPath("Guests.html");
DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
DocumentBuilder db = dbf.newDocumentBuilder();
Document doc = db.parse(filename); // 木構造の生成
Element root = doc.getDocumentElement(); // rootはhtml要素のはず
Element body = (Element)root.getElementsByTagName("body").item(0);
// body要素の検索
// 新しい tableの追加
body.appendChild(createTableFromKeys(req, doc, req.getParameterNames()));
appendNewline(doc, body);
body.appendChild(doc.createElement("hr"));
appendNewline(doc, body);
// 出力処理
TransformerFactory fac = TransformerFactory.newInstance();
Transformer tran = fac.newTransformer();
tran.setOutputProperty(OutputKeys.ENCODING, "Shift_JIS");
// 注: Windows-31Jは少し不都合がある
OutputStream o = new FileOutputStream(filename);
StreamResult result = new StreamResult(o);
tran.transform(new DOMSource(doc.getDocumentElement()), result);
o.close();
out.println("御記帳有難うございました。
");
out.println("ゲストブックはこちらです。");
} catch (Exception e) {
e.printStackTrace(out);
}
out.println("");
out.close();
}
}