将数据从JSF页面传递到MySQL数据库[重复]

Question

这个问题在这里已有答案：

• How to send form input values and invoke a method in JSF bean 1回答

所以我有一个JSF页面，其中包含一个带有<h:inputtext>和一个<h:commandbutton>的panelgrid。当我按下按钮时，我希望inputtexts中引入的数据存储在数据库中。执行操作，问题是存储在数据库中的值为空。

这是豆：

package accountsPackage;

public class Accounts {

    private String username;
    private String password;
    private String CustomerName;
    private String CustomerFirstName;
    private String CustomerMiddleName;
    private String CustomerPhone;
    private String CustomerMobilePhone;
    private String repassword;
    private String email;
    private String address;
    public String getUsername() {
        return username;
    }
    public void setUsername(String username) {
        this.username = username;
    }
    public String getPassword() {
        return password;
    }
    public void setPassword(String password) {
        this.password = password;
    }
    public String getCustomerName() {
        return CustomerName;
    }
    public void setCustomerName(String customerName) {
        CustomerName = customerName;
    }
    public String getCustomerFirstName() {
        return CustomerFirstName;
    }
    public void setCustomerFirstName(String customerFirstName) {
        CustomerFirstName = customerFirstName;
    }
    public String getCustomerMiddleName() {
        return CustomerMiddleName;
    }
    public void setCustomerMiddleName(String customerMiddleName) {
        CustomerMiddleName = customerMiddleName;
    }
    public String getCustomerPhone() {
        return CustomerPhone;
    }
    public void setCustomerPhone(String customerPhone) {
        CustomerPhone = customerPhone;
    }
    public String getCustomerMobilePhone() {
        return CustomerMobilePhone;
    }
    public void setCustomerMobilePhone(String customerMobilePhone) {
        CustomerMobilePhone = customerMobilePhone;
    }
    public String getRepassword() {
        return repassword;
    }
    public void setRepassword(String repassword) {
        this.repassword = repassword;
    }
    public String getEmail() {
        return email;
    }
    public void setEmail(String email) {
        this.email = email;
    }
    public String getAddress() {
        return address;
    }
    public void setAddress(String address) {
        this.address = address;
    }

}

这是连接到MySQL数据库并发送值的类：

package databaseConnection;

import java.sql.*;
import accountsPackage.Accounts;

public class ConnectToDatabase {

    static final String JDBC_DRIVER = "com.mysql.jdbc.Driver";
    static final String DB_URL = "jdbc:mysql://localhost:3306/crochet_onlineshop";

    static final String USER = "root";
    static final String PASS = "root";
    Accounts acc=new Accounts();
    PreparedStatement ps=null;

    public String addUser() throws Exception,SQLException,ClassNotFoundException{
        String username=acc.getUsername();
        String password=acc.getPassword();
        String CustomerName=acc.getCustomerName();
        String CustomerFirstName=acc.getCustomerFirstName();
        String CustomerMiddleName=acc.getCustomerMiddleName();
        String CustomerPhone=acc.getCustomerPhone();
        String CustomerMobilePhone=acc.getCustomerMobilePhone();
        String repassword=acc.getRepassword();
        String email=acc.getEmail();
        String address=acc.getAddress();
        Connection conn = null;

            Class.forName("com.mysql.jdbc.Driver");

            System.out.println("Connecting to database...");
            conn = DriverManager.getConnection(DB_URL, USER, PASS);
            String sqlAcc= "INSERT INTO Customer (username, password, repassword, CustomerName, CustomerFirstName, CustomerMiddleName, CustomerMobilePhone, CustomerPhone, email, address) VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?)";
            ps=conn.prepareStatement(sqlAcc);

            ps.setNString(1, username);
            ps.setNString(2, password);
            ps.setNString(3, repassword);
            ps.setNString(4, CustomerName);
            ps.setNString(5, CustomerFirstName);
            ps.setNString(6, CustomerMiddleName);
            ps.setNString(7, CustomerMobilePhone);
            ps.setNString(8, CustomerPhone);
            ps.setNString(9, email);
            ps.setNString(10, address);
           if( ps.executeUpdate()==1)

               return "success";
           else
                return "fail";


    }
}

这是JSF页面（jsp）：

<%@ page language="java" contentType="text/html; charset=ISO-8859-1" pageEncoding="ISO-8859-1"%>
<%@ taglib prefix="f"  uri="http://java.sun.com/jsf/core"%>
<%@ taglib prefix="h"  uri="http://java.sun.com/jsf/html"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
        <title>Insert title here</title>
    </head>
    <body>
        <h4>Please fill in the necessary fields in order to complete your account</h4>
    <f:view>

        <h:panelGrid columns="1">
            <h:outputLabel value="username"></h:outputLabel>
            <h:inputText value="#{accounts.username}"></h:inputText>
            <h:outputLabel value="password"></h:outputLabel>
            <h:inputSecret value="#{accounts.password}"></h:inputSecret>
            <h:outputLabel value="re-enter password"></h:outputLabel>
            <h:inputSecret value="#{accounts.repassword}"></h:inputSecret>
            <h:outputLabel value="name"></h:outputLabel>
            <h:inputText value="#{accounts.customerName}"></h:inputText>
            <h:outputLabel value="firstname"></h:outputLabel>
            <h:inputText value="#{accounts.customerFirstName}"></h:inputText>
            <h:outputLabel value="middle name"></h:outputLabel>
            <h:inputText value="#{accounts.customerMiddleName}"></h:inputText>
            <h:outputLabel value="mobile phone"></h:outputLabel>
            <h:inputText value="#{accounts.customerMobilePhone}"></h:inputText>
            <h:outputLabel value="phone"></h:outputLabel>
            <h:inputText value="#{accounts.customerPhone}"></h:inputText>
            <h:outputLabel value="email"></h:outputLabel>
            <h:inputText value="#{accounts.email }"></h:inputText>
            <h:outputLabel value="address"></h:outputLabel>
            <h:inputText value="#{accounts.address }"></h:inputText>
            <h:form>
                <h:commandButton action="#{connectToDatabase.addUser}"></h:commandButton>
            </h:form>
        </h:panelGrid>

    </f:view>
</body>
</html>

有人可以帮我找出存储在db中的值为NULL的原因吗？