XML by Example

Figure 12.3: Creating products in the database

The Middle Tier

As explained in Chapter 11, “N-Tiered Architecture and XML,” the middle

tier server is a servlet that manages various XML documents. There is a

document for the list of merchants or another for the list of products, and

more. The servlet applies style sheets to them.

The middle tier server is made of the

Shop class, shown in Listing 12.5.

Shop decodes the URL and routes the requests to the appropriate object.

Listing 12.5: Shop.java

package com.psol.xcommerce;

import java.io.*;

import java.util.*;

import org.w3c.dom.*;

import javax.servlet.*;

import javax.servlet.http.*;

/**

* Shop manages the shop, ...