- Java Beans are reusable software components for Java.
- They are classes that encapsulates many objects into a single object (the bean).
- They are serializable (to save the state of an object), have a no-argument constructor (to instantiate the object), and allow access to properties using getter and setter methods.
As an example, here is the User beans with 2 properties :
package beans;
public class User {
private String email;
private String password;
public String getEmail() {
return email;
}
public void setEmail(String email) {
this.email = email;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
}
After create that class, we can call it from JSP file either to set the value or get the value.
- setbean.jsp
<%@ page language="java" contentType="text/html; charset=ISO-8859-1" pageEncoding="ISO-8859-1"%> <!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=ISO-8859-1"> <title>Set beans</title> </head> <body> <jsp:useBean id="user" class="beans.User" scope="session"></jsp:useBean> <jsp:setProperty property="email" name="user" value="fahmi@gmail.com" /> <jsp:setProperty property="password" name="user" value="letmein" /> </body> </html>
- getbean.jsp
<%@ page language="java" contentType="text/html; charset=ISO-8859-1" pageEncoding="ISO-8859-1"%> <!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=ISO-8859-1"> <title>Insert title here</title> </head> <body> <jsp:useBean id="user" class="beans.User" scope="session"></jsp:useBean> Email : <%= user.getEmail() %> </body> </html>
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