Question

我是用Java开发Web应用程序的新手，我真的在努力解决问题。我的Web应用程序需要完成两个主要任务（简而言之）：

用户选择位置（主要楼层，楼层1等） - ＆gt;所选楼层的平面图显示 - ＆gt;用户可以在计划中标记他的确切位置
用户搜索其他用户 - ＆gt;搜索到的用户标记的适当平面图显示

到目前为止，我的项目包含（最重要的部分）：

FrontController

＆＃13;

public class FrontController extends HttpServlet {

  private static final String SEITE = "/WEB-INF/jsp/navi/index.jsp";
  private Map < String, Controller > controller;

  @
  Override
  public void init() throws ServletException {
    controller = new HashMap < String, Controller > ();
    controller.put("/start", new StartSubController(this));
    // controller.put("/floors/mainfloor", new FloorSubController(this));
    // controller.put("/floors/1og", new FloorSubController(this));
    controller.put("/floors/2og", new FloorSubController(this));
    // controller.put("/floors/3og", new FloorSubController(this));
  }

  @
  Override
  public void doGet(HttpServletRequest request, HttpServletResponse response)
  throws IOException, ServletException {

    // /whereami/test/eins.do ohne /whereami und .do ==> /test/eins
    String navi = request.getRequestURI().substring( // /whereami/test/eins.do
      request.getContextPath().length(), // /whereami
      request.getRequestURI().length() - 3); // .do

    Controller c = controller.get(navi);
    if (c != null) {
      try {
        navi = c.execute(request, response);
      } catch (Exception e) {
        e.printStackTrace();
        throw new ServletException(e);
      }
    }

    // Die URL f�r das Fragment
    request.setAttribute("url", "/WEB-INF/jsp" + navi + ".jsp");

    RequestDispatcher rd = request.getRequestDispatcher(SEITE);
    rd.forward(request, response);
  }

  @
  Override
  public void doPost(HttpServletRequest request, HttpServletResponse response)
  throws IOException, ServletException {
    doGet(request, response);
  }
}

＆＃13;

首页，用户可以在这两个目标之间进行选择（start.jsp和StartSubController） start.jsp

＆＃13;

<form name="sendeEtageOrUser" method="post">
  <div id="waehle-etage" style="display:none;">
    <br>Bitte geben Sie die Etage ihres aktuellen Aufenthaltsortes an:
    <select class="select-etage" name="floor">
      <option value="Erdgeschoss">Erdgeschoss</option>
      <option value="1OG">1.OG</option>
      <option value="2OG">2.OG</option>
      <option value="3OG">3.OG</option>
    </select>
    <br>
    <input id="submit-button-etage" name="geschoss-button" type="submit" value="Bestätigen"></input>
  </div>

  <div id="suche-user-standort" style="display:none;">
    <br>Bitte geben Sie Name oder Kennung des gesuchten Users ein:
    <input type="text" name="userNameOrKennung"></input>
    <br>
    <input id="submit-button-suche-user" name="user-button" type="submit" value="Suchen"></input>
  </div>
</form>

＆＃13;

StartSubController

＆＃13;

public class StartSubController implements Controller {

  private FrontController frontController;
  private DBManager dbManager;
  private String userOrKennung;

  private final String GESCHOSS_BUTTON = "geschoss-button";
  private final String USER_BUTTON = "user-button";

  public StartSubController(FrontController frontController) {
    this.frontController = frontController;
  }

  @
  Override
  public String execute(HttpServletRequest request,
    HttpServletResponse response) throws Exception {

    // /whereami/test/one.do without /whereami and .do ==> /test/one
    String navi = request.getRequestURI().substring( // /whereami/test/one.do
      request.getContextPath().length(), // /whereami
      request.getRequestURI().length() - 3); // .do

    if (request.getMethod().equals("POST")) {
      if (request.getParameter(GESCHOSS_BUTTON).equals("Bestätigen")) {
        // Redirection to controller and to chosen floor
        String floor = request.getParameter("floor");
        if (floor != null) {
          // TODO: Redirect to /whereiam/floors/xog.do
        }
      } else if (request.getParameter(USER_BUTTON).equals("Suchen")) {
        userOrKennung = request.getParameter("userNameOrKennung");
        try {
          if (searchUserInDB(userOrKennung) != null || searchUserInDB(userOrKennung).equals(null)) {
            // TODO: Redirect to /whereiam/floors/xog.do
          }
        } catch (SqlException e) {
          // TODO Handle SqlException
          throw (RuntimeException) new RuntimeException()
            .initCause(e);
        }
      }
    }
    return navi;
  }
}

＆＃13;

现在我的问题：我不明白如何通过StartSubController重定向到http://localhost:8080/whereAmI/floors/2og.do？我知道我不能使用response.sendRedirect（..）和return＆＃34; / floors / 2og＆＃34;在StartSubController的execute方法中，不会更改客户端的URL。但我认为我需要更改URL以使以下FloorSubController与以下jsp一起使用。

提前致谢！

使用MVC重定向到另一个SubController

0 个答案: