Question

我尝试在Lubuntu 13.10上的eclipse kepler上创建简单的web项目。

我在这里遇到了一些麻烦。

当我运行这个项目时：

Run as =＆gt; Run on server

它没有打开注册表。

看起来如下：

registration

用于加载用户表单我需要在网址/addUser的末尾添加。

它应该加载AddUserServlet并将请求转发给adduser.jsp。

这是我的weeb.xml：

    <servlet>
    <servlet-name>ShowUserServlet</servlet-name>
    <servlet-class>com.lab.controler.servlets.ShowUsersServlet</servlet-class>
</servlet>
<servlet-mapping>
    <servlet-name>ShowUserServlet</servlet-name>
    <url-pattern>/showUsers</url-pattern>
</servlet-mapping>

<servlet>
    <servlet-name>RegistrationServlet</servlet-name>
    <servlet-class>com.lab.controler.servlets.AddUserServlet</servlet-class>
</servlet>
<servlet-mapping>
    <servlet-name>RegistrationServlet</servlet-name>
    <url-pattern>/addUser</url-pattern>
</servlet-mapping>

AddUserServlet的内容：

公共类AddUserServlet扩展了HttpServlet {

UserService userService = new UserService();

protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    request.getRequestDispatcher("/pages/addUser.jsp").forward(request, response);
}

protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    User user = new User();

    takeParameterFromRequest(request, user);

    boolean result = userService.addUser(user);

    getServletContext().setAttribute("boolean", result);
    request.getRequestDispatcher("/pages/UserAddingResult.jsp").forward(request, response);
}

private void takeParameterFromRequest(HttpServletRequest request, User user) {
    user.setName(request.getParameter("firstname"));
    user.setLastname(request.getParameter("lastname"));
    user.setEmail(request.getParameter("email"));
    user.setGender(request.getParameter("optionsRadios"));
    user.setCity(request.getParameter("city"));
}

addUser.jsp的摘要：

<html>
  <head>
      <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
      <title>Registration Form</title>
  </head>
  <body>
    <h1 align="center">
        <b>Registration form</b>
    </h1>

<form method="post" action="addUser">
    <div class="control-group">
        <label class="control-label">First Name</label>
        <div class="controls">
            <input type="text" name="firstname" maxlength="20"
                    placeholder="first name" />
        </div>
    </div>

    <div class="control-group">
        <label class="control-label">Last Name</label>
        <div class="controls">
            <input type="text" name="lastname" maxlength="20"
                   placeholder="last name" />
        </div>
    </div>

这是项目层次结构：

hierarchy

并加载表单：

registration form

我无法弄清楚为什么会发生这种情况......任何建议都值得赞赏。

更新

我按照保罗建议，并添加到 web.xml ：

    <welcome-file-list>
    <welcome-file>addUser</welcome-file>
</welcome-file-list>

这个已加载的注册表单，但在填写输入并按下提交后会显示下一个：

500 http status

以下是来自打印堆栈跟踪的片段：

INFO: Server startup in 964 ms
Feb 05, 2014 1:47:16 PM org.apache.jasper.compiler.TldLocationsCache tldScanJar
INFO: At least one JAR was scanned for TLDs yet contained no TLDs. Enable debug logging for this logger for a complete list of JARs that were scanned but no TLDs were found in them. Skipping unneeded JARs during scanning can improve startup time and JSP compilation time.
Feb 05, 2014 1:47:16 PM org.apache.catalina.core.ApplicationDispatcher invoke
SEVERE: Servlet.service() for servlet jsp threw exception
java.lang.ClassNotFoundException: javax.servlet.jsp.tagext.TagLibraryValidator
    at java.net.URLClassLoader$1.run(URLClassLoader.java:366)
    at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(URLClassLoader.java:354)

Answer 1

我不太确定这是你的问题，但你试过吗

http://localhost:8080/UserRegistrationProject/addUser

这应该打开注册页面

如果您希望在运行的服务器上自动打开此表单，请在web.xml中添加“addUser”值

<welcome-file-list>
    <welcome-file>addUser</welcome-file>
</welcome-file-list>

javax / servlet / jsp / tagext / TagLibraryValidator - 运行web项目

1 个答案: