Question

我正在尝试将一些数据（Article对象）传递给JSP，但似乎什么都没有显示，我不确定自己做错了什么。当单击具有文章ID的超链接时，我希望能够显示文章的标题和正文。我想我一定在doGet方法上做错了。现在，当我单击超链接以显示文章时，我得到一个空白页面。

public static Article articleById(int id, Connection conn) throws SQLException {
  try (PreparedStatement stmt = conn.prepareStatement(
    "SELECT * FROM myarticles  WHERE artid = ?")) {
    stmt.setInt(1, id);

    try (ResultSet resultset = stmt.executeQuery()) {

      if (resultset.next()) {
        Article article = new Article();
        article.setArtid(resultset.getInt("artid"));
        article.setTitle(resultset.getString("title"));
        article.setBody(resultset.getString("body"));
        return article;

      } else {

        return null;
      }

    }
  }
}

@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {

  try (Connection conn = DBConnectionUtils.getConnectionFromSrcFolder("connection.properties")) {
    Article articleid = ArticleDAO.articleById(id, conn);
    req.setAttribute("articlebyid", articleid);


    req.getRequestDispatcher("WEB-INF/content-page.jsp").forward(req, resp);
  } catch (SQLException e) {
    System.out.println("error " + e.getSQLState());

  }
}

在单击包含文章ID的超链接时，我要显示文章的标题和正文

<c:forEach var="articles" items="${article}">
  <tr>
    <td>${articles.artid}</td>
    <td><a href="./article-content?id=${articles.artid}">${articles.title}</a></td>
  </tr>
</c:forEach>

<div class="container">
  <h1>Article title goes here</h1>
  ${articlebyid.title}

  <p>Article body goes here</p>
  ${articlebyid.body}
</div>

I forget to include the doget method that display the list of article title that has the hyperlink to display the body and title of the article. here 

@Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {

        try (Connection conn = DBConnectionUtils.getConnectionFromSrcFolder("connection.properties")) {

            List<Article> allarticle =ArticleDAO.getAllArticles(conn);
            req.setAttribute("article",allarticle);

            req.getRequestDispatcher("WEB-INF/article-list-page.jsp").forward(req,resp);
        }catch (SQLException e){
            System.out.println("error "+ e.getSQLState());

        }


    }

将数据传递到JSP

0 个答案: