Question

我一直在尝试使用Java开发网页。

我的index.html：

<!DOCTYPE html>
<html >
  <head>
    <meta charset="UTF-8">
    <title>Simple Dark Form</title>
          <link rel="stylesheet" href="css/style.css">
  </head>

  <body>
<form action="../PatientRegistrationServlet" method="post">
    <link href='http://fonts.googleapis.com/css?family=Open+Sans:400,300,700' rel='stylesheet' type='text/css'>
<link href='http://fonts.googleapis.com/css?family=Sofia' rel='stylesheet' type='text/css'>
<div class='login'>
  <h2>Register</h2>
  <input name='First Name' placeholder='First Name' type='text'>
  <input name='Last Name' placeholder='Last Name' type='text'>
    <input name='ad1' placeholder='Address Line 1' type='text'>
      <input name='Birthdate' placeholder='Birt date' type='text'>
        <input name='ad2' placeholder='Address Line 2' type='text'>
        <input name='Country' placeholder='Country' type='text'>
  <input name='State' placeholder='State' type='text'>
  <input name='city' placeholder='city' type='text'>
    <input name='pcode' placeholder='Pincode' type='text'>
    <input name='Blood group' placeholder='Blood group' type='text'>
     <input name='Email' placeholder='E-Mail' type='text'>
  <input name='Gender' placeholder='Gender' type='text'  >  
        <input name='mobilno' placeholder='Mobile no' type='text'>
        <input id='pw' name='pw' placeholder='Password' type='password'>

<div class='agree'>
    <input id='agree' name='agree' type='checkbox'>
    <label for='agree'></label>Accept rules and conditions
  </div>
  <input class='animated' type='submit' value='Register' ">
  <a class='forgot' href="../cpaneliclinix/login.jsp">Already have an account?</a>
</div>
    </form>
          </body>
</html>

这是我的java servlet页面代码：

package com.iclinix.controller;

import java.io.IOException;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
import java.sql.Statement;

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


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


    public PatientRegistrationServlet() {
        super();
        // TODO Auto-generated constructor stub
    }

    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    }

    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        String fname = request.getParameter("First Name");
        String lname = request.getParameter("Last Name");
        String addr1 = request.getParameter("ad1");
        String bd = request.getParameter("Birthdate");
        String addr2 = request.getParameter("ad2");
        String cntry = request.getParameter("Country");
        String st1 = request.getParameter("State");
        String ct = request.getParameter("city");
        String pc = request.getParameter("pcode");
        String bg = request.getParameter("Blood group");
        String  mail= request.getParameter("Email");
        String gen = request.getParameter("Gender");
        String mno = request.getParameter("mobilno");
        String pass = request.getParameter("pw");       

            try {
                Class.forName("com.mysql.jdbc.Driver");
                Connection con = DriverManager.getConnection("jdbc:mysql://localhost:3306/iclinix","root","root");
                Statement st = con.createStatement();
                st.executeUpdate("INSERT INTO tbl_patient_registration (first_name, last_name, add1, birth_date, add2, country, state, city, pincode, bloodgroup, email, gender, mobileno, password)"+ "values('"+fname+"','"+lname+"','"+addr1+"','"+bd+"','"+addr2+"','"+cntry+"','"+st1+"','"+ct+"','"+pc+"','"+bg+"','"+mail+"','"+gen+"','"+mno+"','"+pass+"')");


            } catch (ClassNotFoundException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            } catch (SQLException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
    }

}

我一直在尝试存储用户在MySQL数据库中以表格形式提供的注册页面的详细信息。 MySQL数据库与它连接。

Here is screenshot

图片链接当我尝试仅使用名字，姓氏和密码的3个字段时，Everthing工作正常，但是当我尝试添加更多字段并运行它时，数据库中没有任何更新。 servlet中没有错误。

它只使用名字和姓氏。请有人帮帮我吗？

Answer 1

您可以尝试以下方法：

String insertStatement = "INSERT INTO tbl_patient_registration (first_name, last_name, add1, birth_date, add2, country, state, city, pincode, bloodgroup, email, gender, mobileno, password) values (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)";
PreparedStatement pst = con.prepareStatement(insertStatement);
pst.setString(1, fname);
pst.setString(2, lname);
pst.setString(3, addr1);
pst.setDate(4, bd); // here I am guessing that the type of the column is date; if I am wrong use setString instead

... // set the rest of the parameters here

pst.setString(14, pass);

pst.executeUpdate(); // execute the statement after setting the params

这比字符串连接更好，因为它处理

SQL注入和
是可读的（我的品味）并且不易出错。

如果您想了解有关PreparedStatement的更多信息，请查看JDBC tutorial。

数据未插入MySQL数据库中

1 个答案: