I have a jsp page, a javabean and a servlet connecting to a database.
我希望在 jsp 页面中以表格的形式打印满足特定查询的所有行。
当我执行代码时，我只得到满足条件的最后一行。我猜前面的所有行都被覆盖了。如何以表格格式打印所有必需的行？我是java新手，所以我不熟悉所有功能。我写的代码如下。
JSP Page:
<%@ 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">
<jsp:useBean id="ASB" class="project.bank.web.AccountSummaryBean" scope="session" />
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Account Summary</title>
</head>
<body>
<form action="AccountSummary" method="post">
<table>
<tr>
<td>Customer ID: <%=request.getSession().getAttribute("custID_user") %></td>
<th><jsp:setProperty property="custID" name="ASB" value="<%=request.getSession().getAttribute(\"custID_user\") %>"/>
</tr>
</table>
-------------------------------------------------------------------------------
Servlet:
-------------------------------------------------------------------------------
package project.bank.web;
import java.io.IOException;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import javax.servlet.RequestDispatcher;
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 AccountSummary extends HttpServlet {
Connection conn = null;
ResultSet rs = null;
PreparedStatement pst = null;
AccountSummaryBean asb = null;
public AccountSummary(AccountSummaryBean asb){
this();
this.asb = asb;
}
public AccountSummary() {
try {
Class.forName("com.mysql.jdbc.Driver");
System.out.println("i am here");
conn = DriverManager.getConnection(
"jdbc:mysql://localhost:3306/bankdb", "root", "root");
pst = conn
.prepareStatement("select * from custacc where custID=(?)");
} catch (ClassNotFoundException e) {
System.out.println("Driver class not found in the classpath");
} catch (SQLException e) {
System.out.println(e);
}
}
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
String custID = (String) req.getSession().getAttribute("custID_user");
try {
int count = 0;
pst.setString(1, custID);
rs = pst.executeQuery();
HttpSession session = req.getSession(false);
while (rs.next()) {
session.setAttribute("accNo", rs.getString("accNo"));
count++;
}
RequestDispatcher rd = req
.getRequestDispatcher("/AccountSummaryPageScreen.jsp");
rd.forward(req, resp);
} catch (SQLException e) {
e.printStackTrace();
}
}
}
-------------------------------------------------------------------------------------
Java Bean
-------------------------------------------------------------------------------------
package project.bank.web;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
public class AccountSummaryBean{
String custID;
String accNo;
String branch;
String balance;
int count=0;
Connection conn = null;
ResultSet rs = null;
PreparedStatement pst = null;
public AccountSummaryBean() {
try {
Class.forName("com.mysql.jdbc.Driver");
System.out.println("i am here");
conn = DriverManager.getConnection(
"jdbc:mysql://localhost:3306/bankdb", "root", "root");
pst = conn
.prepareStatement("select * from custacc where custID=(?)");
} catch (ClassNotFoundException e) {
System.out.println("Driver class not found in the classpath");
} catch (SQLException e) {
System.out.println(e);
}
}
public void display(){
String custID = getCustID();
try{
pst.setString(1, custID);
rs = pst.executeQuery();
//HttpSession session = req.getSession(false);
while (rs.next()) {
rs.next();
//session.setAttribute("accNo", rs.getString("accNo"));
count++;
setAccNo(rs.getString("accNo"));
setBranch(rs.getString("branch"));
setBalance(rs.getString("balance"));
}
} catch (SQLException e) {
e.printStackTrace();
}
}
public String getCustID() {
return custID;
}
public void setCustID(String custID) {
this.custID = custID;
System.out.println("yoyo its working");
System.out.println("cust id is "+getCustID());
display();
}
public String getAccNo() {
return accNo;
//return "aabbccdd";
}
public void setAccNo(String accNo) {
this.accNo = accNo;
}
public String getBranch() {
return branch;
}
public void setBranch(String branch) {
this.branch = branch;
}
public String getBalance() {
return balance;
}
public void setBalance(String balance) {
this.balance = balance;
}
}
<table border="2" bgcolor="pink" width=300 height=50 align=center>
<tr>
<th>Account Number</th>
<th>Branch</th>
<th>Balance</th>
</tr>
<tr>
<th><jsp:getProperty property="accNo" name="ASB"/>
<th><jsp:getProperty property="branch" name="ASB"/></th>
<th><jsp:getProperty property="balance" name="ASB"/></th>
</tr>
</table>
<div align="center">
<br>
<a href="GenerateStatementScreen.jsp">Generate statement</a><br><br>
<a href="FundTransferHomepageScreen.jsp">Transfer Funds</a><br><br>
<a href="CheckCustID.jsp">Login Screen</a>
</div>