.JSP和servlet连接到.java类

我无法运行我的程序。它应该从JSP页面获取信息到servlet，以便它可以通过Java类中的方法进行验证。然后，一旦验证该servlet确定是否将消息发送到前一个JSP页面或成功JSP页面。当我运行该程序时，它会将我带到RegisterUser.jsp页面。我输入信息然后点击提交。它让我变成了一个404找不到的页面。该链接表示它试图将我指向CreateUser.java servlet。它不应该这样做。任何帮助将不胜感激，无论它只是一个链接，我可以找到信息或一些实际的解决方案帮助。谢谢。.JSP和servlet连接到.java类

CreateUser.java SERVLET：

@WebServlet(name = "createUser", urlPatterns = {"/createUser"}) 
public class CreateUser extends HttpServlet { 

/** 
* Processes requests for both HTTP <code>GET</code> and <code>POST</code> 
* methods. 
* 
* @param req 
* @param resp 
* @throws ServletException if a servlet-specific error occurs 
* @throws IOException if an I/O error occurs 
*/ 

    protected void processRequest(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { 
    System.out.println("in process login.java"); 
    ServletContext context = getServletContext(); 

    // Extract password and id from login.jsp form 

    String userName = req.getParameter("USERNAME"); 
    String password = req.getParameter("PASSWORD"); 
    String answerOne = req.getParameter("ANSWERONE"); 
    String answerTwo = req.getParameter("ANSWERTWO"); 
    String answerThree = req.getParameter("ANSWERTHREE"); 

    Boolean duplicateUser = User.verifyUserExists(userName); 

    HttpSession session = req.getSession(); 
    if (duplicateUser) { 
     req.setAttribute("MESSAGE", "UserName is in use. Try again"); 
     context.getRequestDispatcher("/RegisterUser.jsp").forward(req, resp); 
    } 
    else{ 
     User user = new User(userName, password, answerOne, answerTwo, answerThree); 
     user.addUser(user); 
     req.getRequestDispatcher("RegistrationSuccessful.jsp").forward(req, resp); 
    } 

}

}

RegisterUser.jsp

<%@ page language="java" contentType="text/html; charset=ISO-8859-1" 
     pageEncoding="ISO-8859-1"%> 
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN"> 
<HTML> 

    <body> 
     <H1>New User Registration</H1> 
     <H3>Required Information</H3> 

     <FORM name="CREATE" action="servlets/CreateUser.java" method="POST" > 
      <table> 
       <tr> 
        <td>Username:</td> 
        <td><INPUT name="USERNAME" maxlength="50" size="40" type="text" ></TD> 
       </tr> 
       <tr> 
        <td>Password:</td> 
        <td><INPUT name="PASSWORD" maxlength="50" size="40" type="password" ></td> 
       </tr> 
       <tr> 
        <td>Favorite Vacation Spot:</td> 
        <td><INPUT name="ANSWERONE" maxlength="50" size="40" type="text" ></TD> 
       </tr> 
       <tr> 
        <td>Mother's Maiden Name:</td> 
        <td><INPUT name="ANSWERTWO" maxlength="50" size="40" type="text" ></TD> 
       </tr> 
       <tr> 
        <td>First Pet's Name:</td> 
        <td><INPUT name="ANSWERTHREE" maxlength="50" size="40" type="text" ></TD> 
       </tr> 
       <tr> 
        <td><input type="submit" name="Register" value="Register" onClick = "CreateUser.java"></td> 
        <td></td> 
       </tr> 
      </table> 
     </FORM> 
     <p>${MESSAGE}</p> 

    </BODY> 
</HTML>

User.java类

公共类用户{

private String userName; 
private String password; 
    private String answerOne; 
    private String answerTwo; 
    private String answerThree; 
    private static File file = new File("C:\\Users.txt"); 

    @SuppressWarnings("OverridableMethodCallInConstructor") 
    public User(String un, String pw, String a1, String a2, String a3) { 
     setUserName(un); 
     setPassword(pw); 
     setAnswerOne(a1); 
     setAnswerTwo(a2); 
     setAnswerThree(a3); 

    } 

    public void addUser(User user) throws IOException { 
     FileWriter fw = new FileWriter(getFile()); 
     try (BufferedWriter bfw = new BufferedWriter(fw)) { 
      bfw.write(user.userName); 
      bfw.write(user.password); 
      bfw.write(user.answerOne); 
      bfw.write(user.answerTwo); 
      bfw.write(user.answerThree); 
      bfw.newLine(); 
     } 

    } 

    public static boolean verifyUserExists(String userName) throws FileNotFoundException { 
     Scanner scannedFile = new Scanner(getFile()); 
     while (scannedFile.hasNext()) { 
      String search = scannedFile.next(); 
      return search.equals(userName); 
     } 
     return false; 
    } 

    public static Boolean verifyPassword(String userName, String password) throws FileNotFoundException { 
     Scanner scannedFile = new Scanner(getFile()); 
     while (scannedFile.hasNext()) { 
      String search = scannedFile.next(); 
      if (search.equals(userName)) { 
       return scannedFile.nextLine().equals(getMD5(password)); 
      } 
     } 
     return false; 
    } 

    public static String getMD5(String input) { 
     try { 
      MessageDigest md = MessageDigest.getInstance("MD5"); 
      byte[] messageDigest = md.digest(input.getBytes()); 
      BigInteger number = new BigInteger(1, messageDigest); 
      String hashtext = number.toString(16); 
      // Now we need to zero pad it if you actually want the full 32 chars. 
      while (hashtext.length() < 32) { 
       hashtext = "0" + hashtext; 
      } 
      return hashtext; 
     } catch (NoSuchAlgorithmException e) { 
      throw new RuntimeException(e); 
     } 
    } 

    public static File getFile() { 
     return file; 
    }

来源

2014-06-09 KLG2014

试图改变'行动= “小服务程序/ CreateUser.java”''到行动=“小服务程序/ CreateUser“' – yate

我刚刚运行它的建议，仍然收到相同的错误页面。我尝试改变路径和名称，至少不要试图将我引导到我的servlet，而这些servlet无法在浏览器中查看。 – KLG2014

将action =“servlets/CreateUser.java”更改为action =“/ createUser”。 – fajarkoe

使用

action="createUser" OR action="./createUser"

行动= “/的createUser” 将调用默认情况下的URL

http://localhost:8084/createUser

而行动= “./的createUser” 将调用servlet的URL模式在当前目录/上下文

http://localhost:8084/ContextName/createUser

来源

2014-06-10 06:03:05 Tusar

谢谢。事实证明，这是我创建用户的逻辑。在我能做任何事之前，我需要确保我的文件存在。它现在可以工作，并且正确运行。这就是为什么它给了我404错误。该文件未找到。 – KLG2014

.JSP和servlet连接到.java类

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