How to connect html to database with mysql using java

• Planning the Structure
  • index.jsp
  • response.jsp
• Creating a New Project
• Preparing the Web Interface
  • Setting up the welcome page
  • Creating the response page
  • Creating a stylesheet
• Preparing Communication between the Application and Database
  • Setting up a JDBC data source and connection pool
  • Referencing the data source from the application
  • Adding the database driver’s JAR file to the server
• Adding Dynamic Logic
  • Adding the JSTL library to the project’s classpath
  • Implementing JSTL code
• Running the Completed Application
• Troubleshooting
  • Do database resources exist?
  • Do the connection pool and data source exist on the server?
  • Is the MySQL Connector/J driver accessible to the GlassFish server?
  • Is the database password-protected?
  • Are the connection pool properties correctly set?
• See Also

Written by Troy Giunipero

This document describes how to create a simple web application that connects to a MySQL database server. It also covers some basic ideas and technologies in web development, such as JavaServer Pages [JSP], JavaServer Pages Standard Tag Library [JSTL], the Java Database Connectivity [JDBC] API, and two-tier, client-server architecture. This tutorial is designed for beginners who have a basic understanding of web development and are looking to apply their knowledge using a MySQL database.

MySQL is a popular open source database management system commonly used in web applications due to its speed, flexibility and reliability. MySQL employs SQL, or Structured Query Language, for accessing and processing data contained in databases.

This tutorial is a continuation from the Connecting to a MySQL Database tutorial and assumes that you have already created a MySQL database named MyNewDatabase, which you have registered a connection for in the NetBeans IDE. The table data used in that tutorial is contained in ifpwafcad.sql and is also required for this tutorial. This SQL file creates two tables, Subject and Counselor, then populates them with sample data. If needed, save this file to your computer, then open it in the NetBeans IDE and run it on the MySQL database named MyNewDatabase.

{placeholder}
phone: {placeholder}

To view this page in a browser, right-click in the editor and choose Run File [Shift-F6; Fn-Shift-F6 on Mac]. The page compiles, is deployed to the GlassFish server, and opens in your default browser.

*${counselorDetails.email}*
phone: *${counselorDetails.telephone}*

Running the Completed Application

You’ve now completed the application. Try running it again to see how it displays in a browser. Note that because of NetBeans' Compile on Save feature, you do not need to worry about compiling or redeploying the application. When you run a project, you can be sure the deployment contains your latest changes.

Click the Run Project [

] button in the main toolbar. The index.jsp page opens in the IDE’s default browser.

When index.jsp displays in the browser, select a subject from the drop-down list and click submit. You should now be forwarded to the response.jsp page, showing details corresponding to your selection.

Figure 23. response.jsp displayed in a browser, showing data retrieved from database

This concludes the Creating a Simple Web Application Using a MySQL Database tutorial. This document demonstrated how to create a simple web application that connects to a MySQL database. It also demonstrated how to construct an application using a basic two-tier architecture, and utilized numerous technologies including JSP, JSTL, JDBC, and JNDI as a means of accessing and displaying data dynamically.

Troubleshooting

Most of the problems that occur with the tutorial application are due to communication difficulties between the GlassFish Server Open Source Edition and the MySQL database server. If your application does not display correctly, or if you are receiving a server error, the following examinations may be useful.

• Do database resources exist?

• Do the connection pool and data source exist on the server?

• Is the MySQL Connector/J driver accessible to the GlassFish server?

• Is the database password-protected?

• Are the connection pool properties correctly set?

Do database resources exist?

Use the IDE’s Services window [Ctrl-5; ⌘-5 on Mac] to ensure that the MySQL server is running, and that MyNewDatabase is accessible and contains appropriate table data.

• To connect to the MySQL database server, right-click the MySQL Server node and choose Connect.

• If a connection node [

  ] for MyNewDatabase does not display in the Services window, you can create a connection by right-clicking the MySQL driver node [
  ] and choosing Connect Using. Enter the required details in the dialog that displays.

Figure 24. Establish a database connection in the IDE using the New Database Connection dialog

The fields provided in the New Database Connection dialog mirror the URL string entered in the Show JDBC URL option. Therefore, if you know the URL [e.g., jdbc:mysql://localhost:3306/MyNewDatabase] you can paste it into the Show JDBC URL field, and the remaining dialog fields become automatically populated. * To ensure that the Subject and Counselor tables exist and that they contain sample data, expand the MyNewDatabase connection node [

] and locate the MyNewDatabase catalog node [

]. Expand the catalog node to view existing tables. You can view table data by right-clicking a table node and choosing View Data.

Figure 25. View table data by choosing View Data from the right-click menu of a database table node

Do the connection pool and data source exist on the server?

After deploying the application to the GlassFish server, the glassfish-resources.xml contained in the project should instruct the server to create a JDBC resource and connection pool. You can determine whether these exist from the Servers node in the Services window.

• Expand the Servers > the GlassFish Server > Resources node. Expand JDBC Resources to view the jdbc/IFPWAFCAD data source that was created from glassfish-resources.xml. Expand the Connection Pools node to view the IfpwafcadPool connection pool that was created from glassfish-resources.xml. [This is demonstrated above.]

Is the MySQL Connector/J driver accessible to the GlassFish server?

• Locate the GlassFish server installation folder on your computer and drill down into the GlassFish domains/domain1/lib subfolder. Here you should find the mysql-connector-java-5.1.6-bin.jar file.

Is the database password-protected?

The database needs to be password-protected to enable the GlassFish server data source to work properly in this tutorial. If you are using the default MySQL root account with an empty password, you can set the password from a command-line prompt.

• To set your password to nbuser, navigate to your MySQL installation’s bin directory in the command-line prompt and enter the following:

shell> mysql -u root
mysql> UPDATE mysql.user SET Password = PASSWORD['_nbuser_']
    ->     WHERE User = 'root';
mysql> FLUSH PRIVILEGES;

Are the connection pool properties correctly set?

Ensure that the connection pool is working correctly for the server.

1. Open the Services window [Ctrl-5; ⌘-5 on Mac] and expand the Servers node.

2. Right-click the GlassFish server node and choose View Admin Console.

3. Enter the username and password if you are prompted. You can view the username and password in the Servers manager.

4. In the tree on the left side of the console, expand the Resources > JDBC > JDBC Connection Pools > IfpwafcadPool node. Details for the IfpwafcadPool connection pool display in the main window.

5. Click the Ping button. If the connection pool is set up correctly, you will see a ‘Ping Succeeded’ message.

Figure 26. Test your connection pool by clicking Ping in the GlassFish server Admin Console

1. If the ping fails, click the Additional Properties tab and ensure that the listed property values are correctly set.

See Also

For more information about Java web development, see the following resources.

• NetBeans Articles and Tutorials

• Connecting to a MySQL Database in NetBeans IDE. Covers the basics of working with a MySQL database in the IDE.

• Introduction to JavaServer Faces 2.x. An introductory tutorial describing how to use the JSF framework in a Java web project.

• Introduction to the Spring Framework. An introductory tutorial describing how to create an MVC web application using the Spring Framework.

• Java Database Connectivity [JDBC]

• JDBC Overview

• Getting Started with the JDBC API

• The Java Tutorials: JDBC Basics

• JavaServer Pages Standard Tag Library [JSTL]

• JavaServer Pages Standard Tag Library [official product page]

• Java Naming and Directory Interface [JNDI]

• Java SE Core Technologies - Java Naming and Directory Interface

• The JNDI Tutorial

• The Java Tutorials: Java Naming and Directory Interface

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