![]() To use Gson, add the following dependency in your project’s pom. We use Gson - an open source Java library to serialize and deserialize Java objects to JSON developed by Google. ![]() Try (Connection connection = DriverManager.getConnection(databaseURL, user, password)) As you can see, the key point here is that the servlet returns a JSON string to the client. String databaseURL = "jdbc:mysql://localhost:3306/bookstoredb" If you use pure JDBC, here’s a sample DAO class: package net.codejava It’s very simple if you are using Hibernate. In case of our example, it retrieves all rows from the category table and returns a collection of Category objects to the caller. Code DAO ClassThe DAO class is responsible for retrieving data from the database. PHP Date In different forms we will be asking visitors to enter the date in an input field in a particular format. }As you can see, this Category class represents a row in the category table. So our ultimate goal is to dynamically generate HTML code for the drop down list in the JSP page something like this: Ĭode for the model class that represents an item in the drop down list is as simple as below: package net.codejava Create DatabaseSuppose that you want to display items in a drop down list from the following table in a MySQL database: As you can see, the table category contains two columns category_id and name. In case of implementing a dynamic drop down list with items populated from the database, the code to retrieve to items should be written in a Java Servlet, and the code to fill the drop down list with the items should be written in the JSP page using JSTL tags.Now, let’s see the steps to create a dynamic drop down list from database with Java Servlet, JSP and JSTL. I want to store them in a single Dateofbirth column in the database. Why? If you do so, you mix the code of the server side and client side together which will cause problems in reusing and maintaining the code.The best practice is separating code between server side and client side as much as possible. I have 3 fields in birth date, day, month and year, as 3 dropdown list. NOTE: You should not write Java code directly in a JSP page as it’s a very bad practice. You will also learn how to implement a dynamic drop down list from the database using AJAX and JQuery. So the visitor can easily make the choice of date month and. This Java Servlet/JSP tutorial will guide you how to create a drop down list (or combobox) dynamically with items populated from a database. The better way is to ask the visitors to select month, date and year from a drop down list box.
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