Skip to content

Commit

Permalink
updated the files
Browse files Browse the repository at this point in the history
  • Loading branch information
@icodervivek
icodervivek committed Jan 31, 2025
1 parent 30d3ead commit e118dcf
Show file tree
Hide file tree
Showing 3 changed files with 468 additions and 0 deletions.
365 changes: 365 additions & 0 deletions AssignmentOneJava.html
View file
Original file line number Diff line number Diff line change
Expand Up @@ -103,6 +103,11 @@ <h2 class="text-center mt-3 herotxt">
<a href="#twentyfifth">25. Write a program to demonstrate interfaces.</a>
<a href="#twentysixth">26. Write a program to demonstrate packages.</a>
<a href="#twentyseventh">27. Write a program to demonstrate multithreading.</a>
<a href="#twentyeight">28. Write a program to demonstrate JDBC Connectivity.</a>
<a href="#twentyninth">29. Design a login page using JSP and Servlet.</a>
<a href="#thirty">30. Design a page using Servlet and JSP to retrieve and display any 5 user ID and password at the server page which is used in database.</a>
<a href="#thirtyone">31. Write a program to demonstrate cookies and generate log file using JSP and Servlet.</a>

</div>
</section>

Expand Down Expand Up @@ -861,6 +866,366 @@ <h5 id="twentyseventh">27. Write a program to demonstrate multithreading.</h5>
</div>


<h5 id="twentyeight">28. Write a program to demonstrate JDBC Connectivity.</h5>
<div class="container">
<pre class="box">
<code class="java">import java.sql.*;

public class OracleJDBCExample {

public static void main(String[] args) {
try {
// Load the Oracle Type 2 driver (OCI driver)
// The Oracle OCI driver uses the Oracle Client libraries to connect to the Oracle DB
Class.forName("oracle.jdbc.OracleDriver");
System.out.println("Driver Loaded Successfully!");

// Establish a connection using Type 2 driver (OCI)
// You must have the Oracle client (OCI) installed and configured
Connection conn = DriverManager.getConnection(
"jdbc:oracle:oci8:@localhost:1521:orcl", // JDBC URL for OCI driver
"username", // Replace with your Oracle username
"password" // Replace with your Oracle password
);
System.out.println("Connection Established Successfully!");

// Create a statement
Statement stmt = conn.createStatement();

// Execute a query
String query = "SELECT id, Name FROM students"; // SQL query to retrieve student data
ResultSet rs = stmt.executeQuery(query);

// Process the result set
while (rs.next()) {
System.out.println("ID = " + rs.getInt("id") + ", Name = " + rs.getString("Name"));
}

// Close resources
rs.close();
stmt.close();
conn.close();
System.out.println("Connection Closed Successfully!");
} catch (Exception e) {
System.out.println("Something went wrong: " + e.getMessage());
}
}
}

</code>
</pre>
</div>


<h5 id="twentyninth" style="margin-bottom: 2rem;">29. Design a login page using JSP and Servlet.</h5>
<p style="background-color: white;" class="rounded p-2">Part 1: JSP (Login Page) <b>login.jsp</b></p>
<div class="container">
<pre class="box">
<code class="java"><%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
<%@ page import="java.io.*, javax.servlet.*, javax.servlet.http.*" %>
&lt;html&gt;
&lt;head&gt;
&lt;title&gt;Login Page&lt;/title&gt;
&lt;/head&gt;
&lt;body&gt;
&lt;h2&gt;Login Form&lt;/h2&gt;
&lt;form action="LoginServlet" method="post"&gt;
&lt;label for="username"&gt;Username:&lt;/label&gt;&lt;br&gt;
&lt;input type="text" id="username" name="username" required&gt;&lt;br&gt;&lt;br&gt;

&lt;label for="password"&gt;Password:&lt;/label&gt;&lt;br&gt;
&lt;input type="password" id="password" name="password" required&gt;&lt;br&gt;&lt;br&gt;

&lt;button type="submit"&gt;Login&lt;/button&gt;
&lt;/form&gt;
&lt;/body&gt;
&lt;/html&gt;

</code>
</pre>
</div>
<p style="background-color: white;margin-top:-3rem;" class="rounded p-2 mt-1">Part 2: Servlet (Backend Logic) <b>LoginServlet.java</b></p>
<div class="container">
<pre class="box">
<code class="java">import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;

public class LoginServlet extends HttpServlet {
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// Set response content type
response.setContentType("text/html");

// Get the user input from the login form
String username = request.getParameter("username");
String password = request.getParameter("password");

// Logic to validate the credentials (For simplicity, using hardcoded values)
PrintWriter out = response.getWriter();
if ("admin".equals(username) && "password123".equals(password)) {
// If valid, redirect to a welcome page
out.println("<h3>Welcome, " + username + "!</h3>");
out.println("<p>You have logged in successfully.</p>");
} else {
// If invalid, send an error message
out.println("<h3>Invalid login credentials.</h3>");
out.println("<p><a href='login.jsp'>Try again</a></p>");
}
}
}
</code>

</pre>
</div>


<h5 id="thirty">30. Design a page using Servlet and JSP to retrieve and display any 5 user ID and password at the server page which is used in database.</h5>
<p style="background-color: white; margin-top: 2rem;" class="rounded p-2">Using Servlet</p>
<div class="container">
<pre class="box">
<code class="java">import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
import java.sql.*;

public class UserServlet extends HttpServlet {
protected void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html");
PrintWriter out = response.getWriter();

try {
// Connect to the database
Connection conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/mydb",
"root", "password");

// Fetch the first 5 users
String query = "SELECT id, username, password FROM users LIMIT 5";
Statement stmt = conn.createStatement();
ResultSet rs = stmt.executeQuery(query);

// Start HTML output
out.println("&lt;html&gt;&lt;body&gt;");
out.println("&lt;h2&gt;User Details&lt;/h2&gt;");
out.println("&lt;table border='1'&gt;&lt;tr&gt;&lt;th&gt;ID&lt;/th&gt;&lt;th&gt;Username&lt;/th&gt;&lt;th&gt;Password&lt;/th&gt;&lt;/tr&gt;");


// Loop through the result set and display data in a table
while (rs.next()) {
out.println("&lt;tr&gt;");
out.println("&lt;td&gt;" + rs.getInt("id") + "&lt;/td&gt;");
out.println("&lt;td&gt;" + rs.getString("username") + "&lt;/td&gt;");
out.println("&lt;td&gt;" + rs.getString("password") + "&lt;/td&gt;");
out.println("&lt;/tr&gt;");
}
out.println("&lt;/table&gt;");
out.println("&lt;/body&gt;&lt;/html&gt;");

// Close resources
rs.close();
stmt.close();
conn.close();
} catch (Exception e) {
out.println("Error: " + e.getMessage());
}
}
}

</code>
</pre>
</div>

<p style="background-color: white;" class="rounded p-2">Using JSP</p>
<div class="container">
<pre class="box">
<code class="java"><%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8" %>
<%@ page import="java.sql.*, java.util.*" %>
&lt;html&gt;
&lt;head&gt;
&lt;title&gt;User Details&lt;/title&gt;
&lt;style&gt;
table {
width: 50%;
margin: 50px auto;
border-collapse: collapse;
}
th, td {
padding: 8px;
text-align: left;
border: 1px solid #ddd;
}
th {
background-color: #f2f2f2;
}
&lt;/style&gt;
&lt;/head&gt;
&lt;body&gt;
&lt;h2 style="text-align: center;"&gt;User Details&lt;/h2&gt;
&lt;table&gt;
&lt;thead&gt;
&lt;tr&gt;
&lt;th&gt;ID&lt;/th&gt;
&lt;th&gt;Username&lt;/th&gt;
&lt;th&gt;Password&lt;/th&gt;
&lt;/tr&gt;
&lt;/thead&gt;
&lt;tbody&gt;
&lt;%
// Establish the database connection using the utility class
Connection conn = null;
Statement stmt = null;
ResultSet rs = null;

try {
conn = DBConnection.getConnection(); // Use the DBConnection class
stmt = conn.createStatement();

// Query to fetch first 5 users from the database
String query = "SELECT id, username, password FROM users LIMIT 5";
rs = stmt.executeQuery(query);

// Loop through the result set and display user data in the table
while (rs.next()) {
out.println("&lt;tr&gt;");
out.println("&lt;td&gt;" + rs.getInt("id") + "&lt;/td&gt;");
out.println("&lt;td&gt;" + rs.getString("username") + "&lt;/td&gt;");
out.println("&lt;td&gt;" + rs.getString("password") + "&lt;/td&gt;");
out.println("&lt;/tr&gt;");
}
} catch (SQLException e) {
out.println("&lt;tr&gt;&lt;td colspan='3'&gt;Error: " + e.getMessage() + "&lt;/td&gt;&lt;/tr&gt;");
} finally {
// Close the database resources
try {
if (rs != null) rs.close();
if (stmt != null) stmt.close();
if (conn != null) conn.close();
} catch (SQLException e) {
out.println("&lt;tr&gt;&lt;td colspan='3'&gt;Error closing resources: " +
e.getMessage() + "&lt;/td&gt;&lt;/tr&gt;");
}
}
%>
&lt;/tbody&gt;
&lt;/table&gt;
&lt;/body&gt;
&lt;/html&gt;

</code>
</pre>
</div>


<h5 id="thirtyone">31. Write a program to demonstrate cookies and generate log file using JSP and Servlet.</h5>
<p style="background-color: white; margin-top: 2rem;" class="rounded p-2">Servlet: CookieServlet.java
</p>
<div class="container">
<pre class="box">
<code class="java">import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
import java.util.*;
import java.text.*;

public class CookieServlet extends HttpServlet {

private static final String LOG_FILE_PATH = "C:/logs/application.log";
// Change this path based on your system

@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html");
PrintWriter out = response.getWriter();

// Create a new cookie
String userId = UUID.randomUUID().toString(); // Generate a unique user ID
Cookie userCookie = new Cookie("userID", userId);
userCookie.setMaxAge(60 * 60); // Set cookie expiration to 1 hour
response.addCookie(userCookie);

// Log the request information
logRequestToFile(request);

out.println("&lt;html&gt;");
out.println("&lt;body&gt;");
out.println("&lt;h2>Cookie Created Successfully!&lt;/h2&gt;");
out.println("&lt;p>Your unique user ID (Cookie): " + userId + "&lt;/p&gt;");
out.println("&lt;p>&lt;a href='log.jsp'>Click here to view the log file&lt;/a&gt;&lt;/p&gt;");
out.println("&lt;/body&gt;");
out.println("&lt;/html&gt;");
}

// Method to log request information into a log file
private void logRequestToFile(HttpServletRequest request) {
try {
PrintWriter logWriter = new PrintWriter(new FileWriter(LOG_FILE_PATH, true)); // Append mode
String timestamp = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(new Date());
String logMessage = timestamp + " - Access from IP: " + request.getRemoteAddr()
+ " with User-Agent: " + request.getHeader("User-Agent");
logWriter.println(logMessage);
logWriter.close();
} catch (IOException e) {
System.out.println("Error logging request: " + e.getMessage());
}
}
}
</code>
</pre>
</div>

<p style="background-color: white; margin-top: 2rem;" class="rounded p-2">JSP: log.jsp
</p>
<div class="container">
<pre class="box">
<code class="java"><%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
<%@ page import="java.io.*, java.util.*" %>
&lt;html&gt;
&lt;head&gt;
&lt;title&gt;Log File and Cookie Information&lt;/title&gt;
&lt;/head&gt;
&lt;body&gt;
&lt;h2&gt;Cookie Information&lt;/h2&gt;
&lt;p&gt;
&lt;%
Cookie[] cookies = request.getCookies();
if (cookies != null) {
for (Cookie cookie : cookies) {
if ("userID".equals(cookie.getName())) {
out.println("Your User ID (Cookie): " + cookie.getValue());
}
}
} else {
out.println("No cookies found.");
}
%&gt;
&lt;/p&gt;

&lt;h2&gt;Log File Contents&lt;/h2&gt;
&lt;pre&gt;
&lt;%
String logFilePath = &quot;C:/logs/application.log&quot;;
// Make sure the path is correct for your environment
File logFile = new File(logFilePath);
if (logFile.exists()) {
BufferedReader reader = new BufferedReader(new FileReader(logFile));
String line;
while ((line = reader.readLine()) != null) {
out.println(line);
}
reader.close();
} else {
out.println("Log file does not exist.");
}
%&gt;
&lt;/pre&gt;
&lt;/body&gt;
&lt;/html&gt;
</code>
</pre>
</div>


</section>

<script
Expand Down
4 changes: 4 additions & 0 deletions exercise.css
View file
Original file line number Diff line number Diff line change
Expand Up @@ -50,6 +50,10 @@ body{
font-size: 8px;
}

.css{
font-size: 8px;
}

.solutions h5{
font-size: .8rem !important;
}
Expand Down
Loading

0 comments on commit e118dcf

Please sign in to comment.