HTML + Java (Frontend/Backend Structure) This code provides the basic structure of an AS/400 application with Java as the back-end for connecting and interacting with the AS/400 system.
1. HTML Frontend (User Interface)
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>AS/400 Application</title>
<style>
body {
font-family: Arial, sans-serif;
background-color: #f4f4f4;
margin: 0;
padding: 0;
}
header {
background-color: #4CAF50;
padding: 20px;
text-align: center;
color: white;
}
main {
margin: 20px;
}
.card {
background-color: white;
box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
padding: 20px;
margin: 10px 0;
}
button {
background-color: #4CAF50;
color: white;
border: none;
padding: 10px;
font-size: 16px;
cursor: pointer;
}
button:hover {
background-color: #45a049;
}
table {
width: 100%;
border-collapse: collapse;
margin-top: 20px;
}
th, td {
padding: 10px;
text-align: left;
border: 1px solid #ddd;
}
th {
background-color: #f2f2f2;
}
<style>
</head>
<body>
<header>
<h1>AS/400 Application Interface</h1>
<p>Interact with your IBM iSeries (AS/400) system.</p>
</header>
<main>
<div class="card">
<h2>Authenticate</h2>
<form id="authForm">
<label for="username">Username:</label>
<input type="text" id="username" name="username" required>
<br><br>
<label for="password">Password:</label>
<input type="password" id="password" name="password" required>
<br><br>
<button type="submit">Login</button>
</form>
</div>
<div class="card">
<h2>Database Operations</h2>
<button onclick="fetchData()">Fetch Data</button>
<button onclick="updateData()">Update Data</button>
<table id="dataTable">
<thead>
<tr>
<th>ID</th>
<th>Name</th>
<th>Details</th>
</tr>
</thead>
<tbody>
<!-- Data rows will be inserted here by JavaScript -->
</tbody>
</table>
</div>
<div class="card">
<h2>System Command Execution</h2>
<button onclick="executeCommand()">Run Command</button>
<pre id="commandOutput">Command output will appear here...</pre>
</div>
</main>
<script>
// Function to handle login authentication
document.getElementById("authForm").addEventListener("submit", function(event) {
event.preventDefault();
const username = document.getElementById("username").value;
const password = document.getElementById("password").value;
// Call the back-end authentication service (this is just a simulation)
fetch('/authenticate', {
method: 'POST',
headers: { 'Content-Type': 'application/json' },
body: JSON.stringify({ username, password })
})
.then(response => response.json())
.then(data => {
if (data.success) {
alert("Authentication successful!");
// Proceed with showing additional data options
} else {
alert("Authentication failed!");
}
})
.catch(error => console.error('Error during authentication:', error));
});
// Function to simulate fetching data
function fetchData() {
// Simulate fetching data (in a real case, it would be an API call to a Java backend)
const data = [
{ id: 1, name: 'Item 1', details: 'Details for item 1' },
{ id: 2, name: 'Item 2', details: 'Details for item 2' },
{ id: 3, name: 'Item 3', details: 'Details for item 3' }
];
const tableBody = document.querySelector('#dataTable tbody');
tableBody.innerHTML = ''; // Clear any existing rows
data.forEach(item => {
const row = document.createElement('tr');
row.innerHTML = `<td>${item.id}</td><td>${item.name}</td><td>${item.details}</td>`;
tableBody.appendChild(row);
});
}
// Function to simulate updating data
function updateData() {
alert('Data has been updated!');
// Real-world scenario: Send an API request to update data on AS/400
}
// Function to simulate executing system command
function executeCommand() {
const commandOutput = "System command executed successfully!";
document.getElementById('commandOutput').textContent = commandOutput;
// Real-world scenario: Send an API request to execute an AS/400 system command
}
</script>
</body>
</html>
2. Java Backend (API for Authentication and File Manipulation) The back-end part uses Java to handle authentication and file operations (connecting to AS/400 via JDBC or the IBM Toolbox for Java).
Example Java Code (Backend): For this, we use Spring Boot for the back-end API and assume you have the necessary libraries for AS/400 interaction.
Spring Boot Controller for Authentication:
@RestController
@RequestMapping("/api")
public class AS400Controller {
// Example method to authenticate a user
@PostMapping("/authenticate")
public ResponseEntity<Map<String, Object>> authenticate(@RequestBody Map<String, String> credentials) {
String username = credentials.get("username");
String password = credentials.get("password");
boolean isAuthenticated = authenticateUser(username, password);
Map<String, Object> response = new HashMap<>();
response.put("success", isAuthenticated);
if (isAuthenticated) {
// Perform any additional operations if needed
} else {
response.put("error", "Invalid username or password.");
}
return ResponseEntity.ok(response);
}
private boolean authenticateUser(String username, String password) {
// Add your authentication logic here. E.g., using JDBC to validate against AS/400 system
return "validUser".equals(username) && "validPassword".equals(password);
}
}
JDBC Connection to AS/400 Database:
import java.sql.*;
public class AS400DatabaseService {
private static final String JDBC_URL = "jdbc:as400://your_as400_system";
private static final String USER = "your_username";
private static final String PASSWORD = "your_password";
// Method to fetch data from AS/400 database
public List<String> fetchData() throws SQLException {
List<String> data = new ArrayList<>();
try (Connection connection = DriverManager.getConnection(JDBC_URL, USER, PASSWORD)) {
Statement stmt = connection.createStatement();
ResultSet rs = stmt.executeQuery("SELECT * FROM your_table");
while (rs.next()) {
data.add(rs.getString("column_name"));
}
}
return data;
}
// Method to perform file manipulation (e.g., creating files, appending data, etc.)
public void manipulateFile() {
// Your file manipulation logic here
// E.g., using QSYS library to interact with system files
}
}
3. JavaScript and HTML Integration: Authentication: JavaScript sends a POST request to /authenticate when the user logs in. The back-end responds with either success or failure, and JavaScript updates the UI accordingly. Data Fetching: Clicking the "Fetch Data" button in the HTML triggers a call to the back-end API to retrieve data from the AS/400 system. File Manipulation: Similarly, the "Update Data" button and "Run Command" button are placeholders for invoking system file operations and commands.
Conclusion: This setup uses HTML as the frontend to interface with users and Java (Spring Boot) as the backend to handle AS/400 database and file manipulation, including authentication. For actual production usage, you'd need to implement proper backend logic to securely connect to and interact with the AS/400 system, including error handling and secure password management.