import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.io.StringReader;
import jakarta.servlet.ServletException;
import jakarta.servlet.annotation.WebServlet;
import jakarta.servlet.http.HttpServlet;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;
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.xml.sax.InputSource;
@WebServlet("/GuestBookDom")
public class GuestBookDom extends HttpServlet {
private void fileCopy(PrintWriter out, BufferedReader fin) throws IOException {
String line;
while((line = fin.readLine()) != null) {
out.println(line);
}
}
@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
File f = new File(getServletContext().getRealPath("/WEB-INF/GuestsDom.html"));
response.setContentType("text/html; charset=UTF-8");
PrintWriter out = response.getWriter();
BufferedReader fin = new BufferedReader(new InputStreamReader(new FileInputStream(f), "UTF-8"));
fileCopy(out, fin);
fin.close();
out.close();
}
@Override
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
request.setCharacterEncoding("UTF-8");
try {
Document doc;
DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
DocumentBuilder db = dbf.newDocumentBuilder();
String filename = getServletContext().getRealPath("/WEB-INF/GuestsDom.html");
try {
// 読み込みの準備
doc = db.parse(filename); // 木構造の生成
} catch (Exception e) {
String str = "\n"
+ "\n"
+ "ゲストブック\n"
+ "\n"
+ "ゲストブック
\n"
+ "御記帳有難うございました。
\n"
+ "戻る
\n"
+ "\n";
doc = db.parse(new InputSource(new StringReader(str)));
}
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
Element tbl = doc.createElement("table");
tbl.setAttribute("border", "1");
tbl.appendChild(doc.createTextNode("\n"));
for (String parameter: new String[] {"名前", "メールアドレス", "ホームページ", "ひとこと"}) {
Element row = doc.createElement("tr");
Element td1 = doc.createElement("td");
td1.setTextContent(parameter);
row.appendChild(td1);
Element td2 = doc.createElement("td");
td2.setTextContent(request.getParameter(parameter));
row.appendChild(td2);
tbl.appendChild(row);
tbl.appendChild(doc.createTextNode("\n"));
}
body.appendChild(tbl);
body.appendChild(doc.createTextNode("\n"));
body.appendChild(doc.createElement("hr"));
body.appendChild(doc.createTextNode("\n"));
// 出力処理
TransformerFactory fac = TransformerFactory.newInstance();
Transformer tran = fac.newTransformer();
tran.setOutputProperty(OutputKeys.METHOD, "xml");
tran.setOutputProperty(OutputKeys.ENCODING, "UTF-8");
OutputStream o = new FileOutputStream(filename);
StreamResult result = new StreamResult(o);
tran.transform(new DOMSource(doc.getDocumentElement()), result);
o.close();
// response.sendRedirect("GuestBookDomCat");
response.setContentType("text/html; charset=UTF-8");
PrintWriter out = response.getWriter();
BufferedReader fin = new BufferedReader(new InputStreamReader(new FileInputStream(filename), "UTF-8"));
fileCopy(out, fin);
fin.close();
out.close();
} catch (Exception e) {
response.setContentType("text/html; charset=UTF-8");
PrintWriter out = response.getWriter();
out.println("");
e.printStackTrace(out);
out.println("");
}
}
}