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学习使用jdbc向数据库中插入数据

程序员文章站 2022-05-17 18:50:59
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add-book.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!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=UTF-8">
<title>添加图书信息</title>
</head>
<body>
	<p>请输入图书信息<P>
	${message}<br>
	<form action = "add-book"method="post">
		书号：<input type = "text"name="isbn"/><br>
		书名：<input type = "text"name="title"/><br>
		价格：<input type = "text"name="price"/><br>
		<input type = "submit"value= "确定"/><input type = "reset"value="重置"/>
	</form>

</body>
</html>

BookServlet.java

package com.demo;

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

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.ServletConfig;
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 BookServlet
 */
@WebServlet("/add-book")
public class BookServlet extends HttpServlet {
	private static final long serialVersionUID = 1L;
	Connection dbconn = null;
    /**
     * @see HttpServlet#HttpServlet()
     */
    public BookServlet() {
        super();
        // TODO Auto-generated constructor stub
    }

	/**
	 * @see Servlet#init(ServletConfig)
	 */
	public void init(ServletConfig config) throws ServletException {
		// TODO Auto-generated method stub
		String driver = "com.mysql.cj.jdbc.Driver";
		String dburl = "jdbc:mysql://127.0.0.1:3306/webstore?serverTimezone=UTC";
		String username = "root";
		String password = "123456";
		try {
			Class.forName(driver);
			dbconn = DriverManager.getConnection(dburl,username,password);
			
		}catch(ClassNotFoundException e1) {
			System.out.println(e1);
			getServletContext().log("驱动程序类找不到！");
		}catch(SQLException e2) {
			System.out.println(e2);
		}
	}

	/**
	 * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		// TODO Auto-generated method stub
		String isbn = request.getParameter("isbn");
		String title = request.getParameter("title");
		float price = Float.parseFloat(request.getParameter("price"));
		String message="";
		
		try {
			String sql="INSERT INTO books VALUES(?,?,?)";
			PreparedStatement pstmt = dbconn.prepareStatement(sql);
			pstmt.setString(1, isbn);
			pstmt.setString(2,title);
			pstmt.setFloat(3, price);
			
			int num = pstmt.executeUpdate();
			if(num==1) {
				message = "插入记录成功！";
			}else {
				message = "插入记录失败！";
			}
			request.setAttribute("message", message);
			request.getRequestDispatcher("add-book.jsp").forward(request, response);
		}catch(SQLException e) {
			message = e.getMessage();
			request.setAttribute("message", message);
			request.getRequestDispatcher("add-book.jsp").forward(request, response);
		}
	}
	}

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