JSP with Java bean : Beans « JSP « Java
JSP with Java bean
<%@ page import="java.util.*" %>
<html>
<head>
<title>WishList</title>
<jsp:useBean class="com.java2s.WishList" id="wishList" scope="session"/>
<jsp:useBean class="com.java2s.WishListItems" id="wishListItems" scope="application" />
</head>
<body>
<% Enumeration e = request.getParameterNames(); %>
<% Set map = wishList.getMap(); %>
<% while(e.hasMoreElements()){
String key = (String)e.nextElement();
if(key.equals(wishListItems.getItem(0).getId())){
map.add(wishListItems.getItem(0));
}
if(key.equals(wishListItems.getItem(1).getId())){
map.add(wishListItems.getItem(1));
}
if(key.equals(wishListItems.getItem(2).getId())){
map.add(wishListItems.getItem(2));
}
if(key.equals(wishListItems.getItem(3).getId())){
map.add(wishListItems.getItem(3));
}
if(key.equals(wishListItems.getItem(4).getId())){
map.add(wishListItems.getItem(4));
}
} %>
Items currently In your Wish List:<br>
<% if(map.size()==0){ %>
There are no items in your Wish List<br>
<% }
else {
Set set = map; %>
<% if (set!=null){
com.java2s.Item[] keys = new com.java2s.Item[0];
keys = (com.java2s.Item[])set.toArray(keys);
for (int i=0;i<keys.length;i++){ %>
<%=keys[i].getName()%><%="<br>"%>
<% }
}
}%>
<br><a href="wishListForm.jsp">Add another Item</a>
</body>
</html>
//wishListForm.jsp
<html>
<head>
<title>WishList</title>
<jsp:useBean class="com.java2s.WishList" id="wishList" scope="session"/>
<jsp:useBean class="com.java2s.WishListItems" id="wishListItems" scope="application" />
</head>
<body>
Please Select items for your WishList:<br>
<form method="post" action="wishList.jsp">
<input type="checkbox" name="<%=wishListItems.getItem(0).getId()%>"/><%=wishListItems.getItem(0).getName()%> -
<%=wishListItems.getItem(0).getName()%></input><br>
<input type="checkbox" name="<%=wishListItems.getItem(1).getId()%>"/><%=wishListItems.getItem(1).getName()%> -
<%=wishListItems.getItem(1).getName()%></input><br>
<input type="checkbox" name="<%=wishListItems.getItem(2).getId()%>"/><%=wishListItems.getItem(2).getName()%> -
<%=wishListItems.getItem(2).getName()%></input><br>
<input type="checkbox" name="<%=wishListItems.getItem(3).getId()%>"/><%=wishListItems.getItem(3).getName()%> -
<%=wishListItems.getItem(3).getName()%></input><br>
<input type="checkbox" name="<%=wishListItems.getItem(4).getId()%>"/><%=wishListItems.getItem(4).getName()%> -
<%=wishListItems.getItem(4).getName()%></input><br>
<input type="submit" value="Add to My WishList">
</form>
<p><a href="wishList.jsp">Show me my wishlist</a>
<p><a href="logout.jsp">Log Out</a>
</body>
</html>
//logout.jsp
<html>
<head>
<title>WishList</title>
<jsp:useBean class="com.java2s.WishList" id="wishList" scope="session"/>
</head>
<body>
<% session.removeAttribute("wishList");%>
You have been logged out
<p><a href="wishListForm.jsp">Log in again</a>
</body>
</html>
package com.java2s;
public class Item {
private String id;
private String name;
public Item(){}
public Item(String s, String t){
name=s;
id=t;
}
public String getId(){
return id;
}
public String getName(){
return name;
}
}
package com.java2s;
import javax.servlet.http.HttpSessionBindingListener;
import javax.servlet.http.HttpSessionBindingEvent;
import java.util.Set;
import java.util.HashSet;
import java.util.Iterator;
public class WishList implements HttpSessionBindingListener {
private Set map = new HashSet();
public Set getMap(){
return map;
}
//Session binding methods
public void valueBound(HttpSessionBindingEvent e){
System.out.println("The WishList has been Bound!");
}
public void valueUnbound(HttpSessionBindingEvent e){
Item[] keys = new Item[0];
System.out.println("Getting values...");
Iterator it = map.iterator();
while(it.hasNext()){
Item item = (Item)it.next();
System.out.println(item.getName());
}
}
}
package com.java2s;
public class WishListItems {
private Item[] items = {
new Item("ID 1","Name 1"),
new Item("ID 2","Name 2"),
new Item("ID 3","Name 3"),
new Item("ID 4","Name 4"),
new Item("ID 5","Name 5")
};
public Item getItem(int i){
if (items[i]!=null){
return items[i];
}
else {
return null;
}
}
}
