回答編集履歴
1
ソースの修正
answer
CHANGED
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@@ -10,14 +10,87 @@
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入力データを送信するときはPOST（doPost）、画面を表示するときはGET（doGet）で行うようにしてください。
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13
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formタグのmethod属性は、投稿情報の送信時に使用するので、上記の修正に合わせてください。
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14
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15
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BoardServlet.java
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```java
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14
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protected void doGet( HttpServletRequest request, HttpServletResponse response ) throws ServletException, IOException {
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15
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-
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@WebServlet("/board")
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-
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public class BoardServlet extends HttpServlet {
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@Override
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protected void doPost(
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protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
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String id = Optional.ofNullable(request.getParameter("id")).orElse("");
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String title = Optional.ofNullable(request.getParameter("title")).orElse("");
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String body = Optional.ofNullable(request.getParameter("body")).orElse("");
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FileWriter fw = new FileWriter(request.getRealPath("/WEB-INF/classes/bbs_history.txt"),true);
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try (BufferedWriter bw = new BufferedWriter(fw)) {
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bw.write(id + "\r\n");
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bw.write(title + "\r\n");
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bw.write(body + "\r\n");
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}
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saveArticle(new Article(id,title,body));
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response.sendRedirect("board");
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}
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@SuppressWarnings("unused")
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@Override
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protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
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response.setContentType("text/html;charset=UTF-8");
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PrintWriter out = response.getWriter();
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out.println("<html>");
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out.println("<head>");
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out.println("<title>BordServlet</title>");
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out.println("</head>");
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out.println("<body>");
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out.println("<h1>掲示板</h1>");
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out.println("<form action='board' method='POST'>");
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out.println("<table>");
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out.println("<tr><th>発信者ID</th><td><input type = text name='id'></td></tr>");
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out.println("<tr><th>タイトル</th><td><input type = text name='title'></td></tr>");
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out.println("<tr><th>本文</th><td><textarea name='body' rows=5></textarea></td></tr>");
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out.println("</table>");
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out.println("<br>");
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out.println("<input type=submit value='投稿'>");
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out.println("</form>");
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List<Article> articles = getArticleList();
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articles.stream().forEach(article -> {
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out.println("<hr>");
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out.println("発信者ID");
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out.println("<p>" + article.getSenderID() + "</p>");
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out.println("タイトル");
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out.println("<p>" + article.getTitle() + "</p>");
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out.println("本文");
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out.println("<pre>" + article.getBody() + "</pre>");
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out.println("<hr>");
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});
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out.println("</body>");
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out.println("</html>");
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}
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private List<Article> getArticleList(){
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return Optional.ofNullable((List<Article>)this.getServletContext().getAttribute("articles")).orElse(new ArrayList<>());
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}
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86
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private void saveArticle(Article article){
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87
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List<Article> articles = getArticleList();
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19
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articles.add(article);
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this.getServletContext().setAttribute("articles", articles);
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}
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91
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}
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```
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93
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23
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-
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94
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上記のソースは、表示する投稿データをサーブレットコンテキストに保持しているので、
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95
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リロードを行うと投稿したデータが初期化されます。
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96
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投稿データは、サーブレットコンテキストではなくファイルから読み込む必要があります。
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