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私のプロジェクトでは、ユーザー テーブルからアカウントを削除するためのアカウントのキャンセル機能を作成しています。ユーザーテーブル名はnewuser. cancelaccountjsp は次のようになります。

<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
 <head>
   <style type="text/css">
body {
background-image: url("shocked.jpg");
background-repeat:no-repeat;
background-position: top right;
 }
p
 {
    font-family: serif;
    font-weight: bold;
    color: blue;
    size: 5px;
    text-align: center;
 }

 </style>
 <meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
 <title>Insert title here</title>
 </head>
 <body>

 <form action="Cancelaccount" name="cancelaccount">
 <p>Are you sure to cancel account?</p>
 <p>If yes please retype the password</p>
 <p><input type="password" align="middle" name="password"></input></p>
 <input type="submit" value="Cancel Account"></input>
 <p>Else click <a href="UserHome.jsp">here</a></p> 
 </form>
 </body>
 </html>

サーブレットで、現在入力しているパスワードとアカウント開設時にCancelaccount登録したパスワードを照合しようとしています。それらが一致する場合、アカウントをキャンセルする必要があります。

import getset.Getset;

import java.io.IOException;
import java.io.PrintWriter;

import java.sql.SQLException;

import accessdb.Dao;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

public class Cancelaccount extends HttpServlet {
    private static final long serialVersionUID = 1L;

    /**
     * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
     */
    protected void doGet(HttpServletRequest request,
                         HttpServletResponse response) throws ServletException,
                                                              IOException {
        // TODO Auto-generated method stub
        Getset g = new Getset();
        Dao dao = new Dao();
        PrintWriter pw = response.getWriter();
        String password = request.getParameter("password");
        HttpSession session = request.getSession();
        String userid = (String)session.getAttribute("userid");
        if (password.equals("") || password.equals(" "))
            response.sendRedirect("UserHome.jsp");
        g.setuserid(userid);
        g.setloginpassword(password);
        try {
            String password1 = dao.getregpasswordbyuserid(g);
            if (password1 == password) {
                dao.cancelaccount(g);
                pw.println("<html>Your Account has been successfully cancelled from the system.<p>" +
                           "Click here to go to <a href=\"WelcomePage.jsp\">Start Page</a><html>");
                session.invalidate();

            } else {
                response.sendRedirect("UserHome.jsp");
            }


        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        } catch (SQLException e) {
            e.printStackTrace();
        }

    }
}

DAO関数コードは次のとおりです。

public void cancelaccount(Getset g)throws ClassNotFoundException,SQLException{
    //Delete a user from NEWUSER TABLE AND MEALDB TABLE
    Connection con=Dbconnection.getConnection();
    String userid=g.getuserid();
    PreparedStatement pstmt=con.prepareStatement("delete from mealdb where userid=?");
    pstmt.setString(1, userid);
    pstmt.executeUpdate();
    PreparedStatement pstmt1=con.prepareStatement("delete from newuser where userid=?");
    pstmt1.setString(1, userid);
    pstmt1.executeUpdate();
}
public String getregpasswordbyuserid(Getset g)throws ClassNotFoundException,SQLException{
    //GET PASSWORD BY USERID
    Connection con=Dbconnection.getConnection();
    String userid=g.getuserid();
    PreparedStatement pstmt=con.prepareStatement("select regpassword from newuser where userid=?");
    pstmt.setString(1, userid);
    ResultSet rs=pstmt.executeQuery();
    rs.next();
    String p=rs.getString(1);
    System.out.println(""+p);
    return p;

}

そして、次のstacktraceとおりです。

    11:35:29,912 ERROR [STDERR] java.sql.SQLException: Exhausted Resultset
    11:35:29,912 ERROR [STDERR]     at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:125)
    11:35:29,912 ERROR [STDERR]     at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:162)
    11:35:29,912 ERROR [STDERR]     at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:227)
    11:35:29,912 ERROR [STDERR]     at oracle.jdbc.driver.OracleResultSetImpl.getString(OracleResultSetImpl.java:347)
    11:35:29,912 ERROR [STDERR]     at accessdb.Dao.getregpasswordbyuserid(Dao.java:245)
    11:35:29,912 ERROR [STDERR]     at Cancelaccount.doGet(Cancelaccount.java:39)
    11:35:29,912 ERROR [STDERR]     at javax.servlet.http.HttpServlet.service(HttpServlet.java:690)
    11:35:29,912 ERROR [STDERR]     at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
    11:35:29,912 ERROR [STDERR]     at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
    11:35:29,912 ERROR [STDERR]     at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
    11:35:29,912 ERROR [STDERR]     at org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96)
    11:35:29,912 ERROR [STDERR]     at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
    11:35:29,912 ERROR [STDERR]     at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
     11:35:29,912 ERROR [STDERR]    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:230)
    11:35:29,912 ERROR [STDERR]     at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
    11:35:29,912 ERROR [STDERR]     at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:179)
    11:35:29,912 ERROR [STDERR]     at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:84)
    11:35:29,912 ERROR [STDERR]     at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
    11:35:29,912 ERROR [STDERR]     at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:104)
    11:35:29,912 ERROR [STDERR]     at org.jboss.web.tomcat.service.jca.CachedConnectionValve.invoke(CachedConnectionValve.java:157)
    11:35:29,912 ERROR [STDERR]     at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
    11:35:29,912 ERROR [STDERR]     at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:241)
    11:35:29,912 ERROR [STDERR]     at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844)
    11:35:29,912 ERROR [STDERR]     at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:580) 
    11:35:29,912 ERROR [STDERR]     at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
    11:35:29,912 ERROR [STDERR]     at java.lang.Thread.run(Unknown Source)

DAOs'関数では、フィールドがinおよびin であるため、cancelaccount別のテーブルからも削除しました。一生懸命調べましたが、方法が見つかりませんでした。ありがとうございました。mealdbuseridprimary keynewuserforeign keymealdb

4

2 に答える 2

0

getregpasswordbyuserid() のコードを次のように変更してみてください。

ResultSet rs=pstmt.executeQuery();
String p="";
while(rs.next()){
    p=rs.getString(1);
    System.out.println(""+p);
}
return p;
于 2012-07-27T06:50:37.600 に答える
0

問題は解決しました。サーブレットコードを変更したところ、うまくいきました。セッションからのユーザー ID値が正常にフェッチされませんでした。作業コードは次のとおりです。

import getset.Getset;

import java.io.IOException;
import java.io.PrintWriter;

import java.sql.SQLException;

import accessdb.Dao;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

public class Cancelaccount extends HttpServlet {
    private static final long serialVersionUID = 1L;

    protected void doGet(HttpServletRequest request,
                         HttpServletResponse response) throws ServletException,
                                                              IOException {
        // TODO Auto-generated method stub
        Getset g = new Getset();
        Dao dao = new Dao();
        PrintWriter pw = response.getWriter();
        String password = request.getParameter("password");
        System.out.println("" + password);
        HttpSession session = request.getSession(true);
        String userid = (String)session.getAttribute("USERID");
        System.out.println("" + userid);
        /*  if(password.equals("") || password.equals(" "))
    {
    response.sendRedirect("UserHome.jsp");

    } */
        g.setuserid(userid);
        try {
            String password1 = dao.getpasswordbyuserid(g);
            System.out.println("" + password1);
            if (password1.equals(password)) {
                dao.cancelaccount(g);
                pw.println("<html>Your Account has been successfully cancelled from the system.<p>" +
                           "Click here to go to <a href=\"WelcomePage.jsp\">Start Page</a><html>");
                session.invalidate();

            } else {
                response.sendRedirect("UserHome.jsp");
            }


        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        } catch (SQLException e) {
            e.printStackTrace();
        }

    }
}
于 2012-07-27T09:04:01.987 に答える