Question

我试图捕获从表单输入的数据。一旦我点击提交按钮，但我遇到了困难。下面是我的简单代码。我试图在注册页面上工作，该页面捕获有关某人的所有信息。一些数据有一个下拉菜单和单选按钮。我想捕获并存储数据库中的所有内容（mysql）。

我的servlet代码：

package com.Registration.Controllers;

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

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * Servlet implementation class AddUserSevelet
 */
@WebServlet("/AddUserSevelet")
public class AddUserSevelet extends HttpServlet {
    private static final long serialVersionUID = 1L;

    /**
     * @see HttpServlet#HttpServlet()
     */
    public AddUserSevelet() {
        super();
        // TODO Auto-generated constructor stub
    }

    /**
     * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
     */
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        // TODO Auto-generated method stub
        response.getWriter().append("Served at: ").append(request.getContextPath());
    }

    /**
     * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
     */
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        // TODO Auto-generated method stub

        response.setContentType("text/html");
        PrintWriter write = response.getWriter();

        String username = request.getParameter("uname");
        String password = request.getParameter("pass");
        String country = request.getParameter("country");




        AddUser register =new AddUser();

        if (register.adduser(username, password, country)){

            write.println("You Have Been Registered Successfully");

        } else {
            write.print("ERROR WHILE LOADING");
            }
    }

} 

my adduser class

    package com.Registration.Controllers;

import java.sql.Connection;
import java.sql.PreparedStatement;

public class AddUser {
public boolean adduser(String userName,String password,String country){

        boolean isRegistered = false;
        try{
        Connection con = DB_Connection.getConnection();
        PreparedStatement psmt = con.prepareStatement("insert into user VALUES(default,?,?,?,?)");
        psmt.setString(1, userName);
        psmt.setString(2, password);
        psmt.setString(3, country);


        int success = psmt.executeUpdate();
        if(success > 0){

            isRegistered = true;


        }
        } 
        catch(Exception e){

            e.printStackTrace();
        }

        return isRegistered;

    }

}

我的HTML代码：

<body>
<form action="AddUserSevelet" method="post">
UserName: <input type="text" name="uname"/><br/><hr/>
password: <input type="password" name="pass"/><br/><hr/>
Country: <input type="text" name="country"/><br/><hr/>

 <input type="radio" name="color" value="red" checked>red
  <br>
  <input type="radio" name="color" value="blue" checked>blue
  <br>
  <input type="radio" name="color" value="white">white
 <br/><hr/>
 <br/><hr/>

<select name ="cars">
<option value="BMW"> BMW 320i</option>
<option value="BENZ"> Compressor</option>
<option value="Toyota"> Allion</option>
<option value="Audi"> A5</option>
<option value="Jeep"> Cheroki</option>
<option value="Volvo"> Volvo g5</option>


</select>
<input type="submit" value="Register"/><br/><hr/>
</body>

我的问题是如何从下拉菜单和单选按钮捕获数据，如果我将更改我的servlet代码：

protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        // TODO Auto-generated method stub

        response.setContentType("text/html");
        PrintWriter write = response.getWriter();

        String username = request.getParameter("uname");
        String password = request.getParameter("pass");
        String country = request.getParameter("country");
        String cars = request.getParameter("cars");
        String color = request.getParameter("color");



        AddUser register =new AddUser();

        if (register.adduser(username, password, country, cars , color)){

            write.println("You Have Been Registered Successfully");

        } else {
            write.print("ERROR WHILE LOADING");
            }

我的班级代码：

 Connection con = DB_Connection.getConnection();
    PreparedStatement psmt = con.prepareStatement("insert into 'user'(?,?,?,?,?) VALUES(default,?,?,?,?,?,?)");
    psmt.setString(1, userName);
    psmt.setString(2, password);
    psmt.setString(3, country);
    psmt.setString(4, cars);
    psmt.setString(5, color);

我得到错误：

加载时出现
错误，并且在控制台中出现java.sql.SQLEXCEPTION:No VALUE specified for parameter 6

请帮助我解决如何使用servlet捕获数据并插入或编辑数据的方法或解决方案。我是一个刚尝试学习的新手。谢谢！

从下拉菜单和单选按钮捕获数据

0 个答案: