How to create a bean, set bean values and access bean values
In this example, we are going to create a Shopping Item - bean and access it's values in a JSP page.
Beans allow to share data across multiple JSPs.
ShoppingItem.java - Bean
package com.beans;
// ShoppingItem - bean
public class ShoppingItem {
private String itemId;
private String desc;
private double price;
public String getItemId() {
return itemId;
}
public void setItemId(String itemId) {
this.itemId = itemId;
}
public String getDesc() {
return desc;
}
public void setDesc(String desc) {
this.desc = desc;
}
public double getPrice() {
return price;
}
public void setPrice(double price) {
this.price = price;
}
}
// ShoppingItem - bean
public class ShoppingItem {
private String itemId;
private String desc;
private double price;
public String getItemId() {
return itemId;
}
public void setItemId(String itemId) {
this.itemId = itemId;
}
public String getDesc() {
return desc;
}
public void setDesc(String desc) {
this.desc = desc;
}
public double getPrice() {
return price;
}
public void setPrice(double price) {
this.price = price;
}
}
setItem.jsp
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Add Shopping Items</title>
</head>
<body>
<!-- Set bean values -->
<jsp:useBean id="item1" class="com.beans.ShoppingItem" scope="session"></jsp:useBean>
<jsp:setProperty property="itemId" name="item1" value="1000"/>
<jsp:setProperty property="desc" name="item1" value="Samsung S6"/>
<jsp:setProperty property="price" name="item1" value="700"/>
<p>Bean properties has been set.</p>
</body>
</html>
pageEncoding="ISO-8859-1"%>
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Add Shopping Items</title>
</head>
<body>
<!-- Set bean values -->
<jsp:useBean id="item1" class="com.beans.ShoppingItem" scope="session"></jsp:useBean>
<jsp:setProperty property="itemId" name="item1" value="1000"/>
<jsp:setProperty property="desc" name="item1" value="Samsung S6"/>
<jsp:setProperty property="price" name="item1" value="700"/>
<p>Bean properties has been set.</p>
</body>
</html>
getItem.jsp
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Shopping Items</title>
</head>
<body>
<!-- Get bean values -->
<jsp:useBean id="item1" class="com.beans.ShoppingItem" scope="session"></jsp:useBean>
<p>Item ID : <%= item1.getItemId() %></p>
<p>Item Description : <%= item1.getDesc() %></p>
<p>Item Price : $<%= item1.getPrice() %></p>
</body>
</html>
pageEncoding="ISO-8859-1"%>
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Shopping Items</title>
</head>
<body>
<!-- Get bean values -->
<jsp:useBean id="item1" class="com.beans.ShoppingItem" scope="session"></jsp:useBean>
<p>Item ID : <%= item1.getItemId() %></p>
<p>Item Description : <%= item1.getDesc() %></p>
<p>Item Price : $<%= item1.getPrice() %></p>
</body>
</html>
Notes:
- The "id" property in the useBean jsp tag should be the same when you set the bean properties as well as when you retrieve the bean values.
- First run the setItem.jsp file and then the viewItem.jsp file. If not the values in the viewItem.jsp will be null for string and 0.0 for double.
Tools Used:
Eclipse Kepler
Project Directory 
Output
No comments :
Post a Comment