Package servlet

Class CustomerServlet

java.lang.Object

javax.servlet.GenericServlet

javax.servlet.http.HttpServlet

servlet.CustomerServlet

All Implemented Interfaces:

Serializable, javax.servlet.Servlet, javax.servlet.ServletConfig

@WebServlet("/customer")
public class CustomerServlet
extends javax.servlet.http.HttpServlet

Servlet that handles all customer related operations. Manages customer retrieval, updates, and deletion with role based access control.

Author:

TAMIL MUGHILAN

See Also:

• Serialized Form

Constructor Summary

Constructors

Constructor	Description
CustomerServlet()

Method Summary

Modifier and Type	Method	Description
protected void	doGet(javax.servlet.http.HttpServletRequest request, javax.servlet.http.HttpServletResponse response)	Handles GET requests for customer retrieval operations.
protected void	doPost(javax.servlet.http.HttpServletRequest request, javax.servlet.http.HttpServletResponse response)	Handles POST requests for customer modification operations.
private DataStorage	getDataStorage(String storageType)	Gets the appropriate data storage implementation based on storage type.
private void	sendJsonResponse(javax.servlet.http.HttpServletResponse response, boolean success, String message, Object data)	Sends JSON response for AJAX requests.

Methods inherited from class javax.servlet.http.HttpServlet

doDelete, doHead, doOptions, doPut, doTrace, getLastModified, service, service

Methods inherited from class javax.servlet.GenericServlet

destroy, getInitParameter, getInitParameterNames, getServletConfig, getServletContext, getServletInfo, getServletName, init, init, log, log

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

CustomerServlet

public CustomerServlet()

Method Details

getDataStorage

private DataStorage getDataStorage(String storageType)
                            throws SQLException

Gets the appropriate data storage implementation based on storage type.

Parameters:

storageType - the type of storage (database, collection, mongodb)

Returns:

the data storage implementation

Throws:

SQLException - if database connection fails

sendJsonResponse

private void sendJsonResponse(javax.servlet.http.HttpServletResponse response,
 boolean success,
 String message,
 Object data)
                       throws IOException

Sends JSON response for AJAX requests.

Parameters:

response - the HTTP response

success - whether the operation was successful

message - the response message

data - the response data

Throws:

IOException - if writing response fails

doGet

protected void doGet(javax.servlet.http.HttpServletRequest request,
 javax.servlet.http.HttpServletResponse response)
              throws javax.servlet.ServletException,
IOException

Handles GET requests for customer retrieval operations. Performs Dependency Injection by passing the user's choice of data storage into the Services. Viewing customers by ID, email, and branch.

Overrides:

doGet in class javax.servlet.http.HttpServlet

Parameters:

request - the HTTP servlet request

response - the HTTP servlet response

Throws:

javax.servlet.ServletException - if a servlet error occurs

IOException - if an I/O error occurs

doPost

protected void doPost(javax.servlet.http.HttpServletRequest request,
 javax.servlet.http.HttpServletResponse response)
               throws javax.servlet.ServletException,
IOException

Handles POST requests for customer modification operations. Performs customer updates and deletion with proper authorization.

Overrides:

doPost in class javax.servlet.http.HttpServlet

Parameters:

request - the HTTP servlet request

response - the HTTP servlet response

Throws:

javax.servlet.ServletException - if a servlet error occurs

IOException - if an I/O error occurs