Webアプリ開発入門 Servlet/JSP編3:JavaとSQLでデータベースを操作しよう

(tomcat/webapps/mydatabase/ShowSqlServlet.java)

// JDBCで、データ呼び出し
// Servlet-JSP間をArryaList<HashMap<String, String>>で渡す

import java.io.*;
import java.util.*;
import javax.servlet.*;
import javax.servlet.http.*;
import java.sql.*;

public class ShowSqlServlet extends HttpServlet {

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

        request.setAttribute("message", "Hello World!");

        String url = "jdbc:mysql://localhost/mydb";
        String user = "root";
        String password = "";

        try {
            Class.forName("com.mysql.jdbc.Driver");
        } catch (Exception e) {
            e.printStackTrace();
        }

        try (Connection connection = DriverManager.getConnection(url, user, password);
             PreparedStatement statment = connection.prepareStatement("SELECT * FROM players");
             ResultSet results = statment.executeQuery()){

        } catch (Exception e) {

        }

        String view = "/WEB-INF/views/index.jsp";
        RequestDispatcher dispatcher = request.getRequestDispatcher(view);
        dispatcher.forward(request, response);

    }
}

- Javaの道＞Servlet・JSP
https://www.javaroad.jp/servletjsp/index.html

- Servletアプリ開発：目次 - Web系開発メモ
http://web-dev.hatenablog.com/entry/java/servlet/dev-restful-app/table-of-contents

- JSP(formデータ)とJava Servletプログラムの連携 - はしくれエンジニアもどきのメモ
http://cartman0.hatenablog.com/entry/2015/12/08/181657

- データベース接続 - サーブレット入門
https://www.javadrive.jp/servlet/database/