initial

src/main/java/launch/Main.java

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+package launch;
+
+import java.io.File;
+import java.io.UnsupportedEncodingException;
+import java.net.URISyntaxException;
+import java.nio.file.Files;
+import java.nio.file.Path;
+
+import org.apache.catalina.Server;
+import org.apache.catalina.WebResourceRoot;
+import org.apache.catalina.WebResourceSet;
+import org.apache.catalina.core.StandardContext;
+import org.apache.catalina.startup.Tomcat;
+import org.apache.catalina.webresources.DirResourceSet;
+import org.apache.catalina.webresources.EmptyResourceSet;
+import org.apache.catalina.webresources.StandardRoot;
+
+import java.util.logging.*;
+
+public class Main {
+
+    private static File getRootFolder() {
+        try {
+            File root;
+            String runningJarPath = Main.class.getProtectionDomain().getCodeSource().getLocation().toURI().getPath().replaceAll("\\\\", "/");
+            int lastIndexOf = runningJarPath.lastIndexOf("/target/");
+            if (lastIndexOf < 0) {
+                root = new File("");
+            } else {
+                root = new File(runningJarPath.substring(0, lastIndexOf));
+            }
+            System.out.println("application resolved root folder: " + root.getAbsolutePath());
+            return root;
+        } catch (URISyntaxException ex) {
+            throw new RuntimeException(ex);
+        }
+    }
+
+    private static void configureLogging() throws SecurityException, UnsupportedEncodingException {
+        Level level = Level.INFO;
+        java.util.logging.Logger logger = java.util.logging.Logger.getLogger("");
+        logger.setLevel(level);
+        Handler[] handlers = logger.getHandlers();
+        Handler handler;
+        if (handlers.length == 1 && handlers[0] instanceof ConsoleHandler) {
+            handler = handlers[0];
+        } else {
+            handler = new ConsoleHandler();
+        }
+        handler.setFormatter(new SimpleFormatter());
+        handler.setLevel(level);
+        handler.setEncoding("UTF-8");
+        logger.addHandler(handler);
+    }
+
+    public static void main(String[] args) throws Exception {
+        configureLogging();
+
+        File root = getRootFolder();
+        System.setProperty("org.apache.catalina.startup.EXIT_ON_INIT_FAILURE", "true");
+        Tomcat tomcat = new Tomcat();
+
+        Path tempPath = Files.createTempDirectory("tomcat-base-dir");
+        tomcat.setBaseDir(tempPath.toString());
+
+        //The port that we should run on can be set into an environment variable
+        //Look for that variable and default to 8080 if it isn't there.
+        String webPort = System.getenv("PORT");
+        if (webPort == null || webPort.isEmpty()) {
+            webPort = "8080";
+        }
+
+        tomcat.setHostname("localhost");
+        tomcat.setPort(Integer.parseInt(webPort));
+
+        File webContentFolder = new File(root.getAbsolutePath(), "src/main/resources/webapp");
+        if (!webContentFolder.exists()) {
+            webContentFolder = Files.createTempDirectory("default-doc-base").toFile();
+        }
+        StandardContext ctx = (StandardContext) tomcat.addWebapp("", webContentFolder.getAbsolutePath());
+        ctx.setDocBase(webContentFolder.getAbsolutePath() + File.separator + "static");
+        //Set execution independent of current thread context classloader (compatibility with exec:java mojo)
+        ctx.setParentClassLoader(Main.class.getClassLoader());
+
+        System.out.println("configuring app with basedir: " + webContentFolder.getAbsolutePath());
+
+        // Declare an alternative location for your "WEB-INF/classes" dir
+        // Servlet 3.0 annotation will work
+        File additionWebInfClassesFolder = new File(root.getAbsolutePath(), "target/classes");
+        WebResourceRoot resources = new StandardRoot(ctx);
+
+        WebResourceSet resourceSet;
+        if (additionWebInfClassesFolder.exists()) {
+            resourceSet = new DirResourceSet(resources, "/WEB-INF/classes", additionWebInfClassesFolder.getAbsolutePath(), "/");
+            System.out.println("loading WEB-INF resources from as '" + additionWebInfClassesFolder.getAbsolutePath() + "'");
+        } else {
+            resourceSet = new EmptyResourceSet(resources);
+        }
+        resources.addPreResources(resourceSet);
+        resources.addPreResources(new DirResourceSet(resources, "/WEB-INF/jsp", webContentFolder.getAbsolutePath() + File.separator + "jsp", "/"));
+        ctx.setResources(resources);
+        tomcat.getConnector();
+    
+        tomcat.start();
+        System.out.println("Listening to port " + webPort);
+
+        Server server = tomcat.getServer();
+        server.await();
+    }
+}

src/main/java/model/HelloJspViewModel.java

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+package model;
+
+import java.util.List;
+
+public class HelloJspViewModel {
+    private final List<Integer> data;
+    public HelloJspViewModel(List<Integer> data) {
+        this.data = data;
+    }
+
+    public List<Integer> getData() {
+        return data;
+    }
+}

src/main/java/servlet/Database.java

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+package servlet;
+import java.sql.*;
+
+/*
+ * Class for managing the database.
+ */
+public class Database implements AutoCloseable {
+	
+	// If you have the mysql server on your own computer use "localhost" as server address.
+	private static String databaseServerAddress = "vm26.cs.lth.se";
+	private static String databaseUser = "<your databse user on vm26>";             // database login user
+	private static String databasePassword = "<your password>";          // database login password
+	private static String database = "<your database, normally the same as database user>";             // the database to use, i.e. default schema
+	private Connection conn = null;
+	
+	public Database() {
+		try{
+			conn = DriverManager.getConnection("jdbc:mysql://" + databaseServerAddress + "/" + 
+                    database, databaseUser, databasePassword);
+			
+			// Display the contents of the database in the console. 
+			// This should be removed in the final version
+			try(Statement stmt = conn.createStatement()) {
+				ResultSet rs = stmt.executeQuery("select * from Respondents"); 
+				while (rs.next()) {
+					String name = rs.getString("name"); 
+					System.out.println(name);
+				}
+			}
+			
+		} catch (SQLException e) {
+			throw new RuntimeException(e);
+		}
+	}
+	
+	public boolean addName(String name) {
+		String sql = "insert into Respondents (name) values(?)";
+
+		try(PreparedStatement ps = conn.prepareStatement(sql)) {
+			ps.setString(1, name);
+		    ps.executeUpdate(); 
+		    return true;
+		} catch (SQLException e) {
+		    if(e.getErrorCode()==1062 && e.getSQLState().equals("23000")){ 
+		    	// duplicate key error
+		    	System.out.println(name + " already exists in the database");
+		    } else {
+				printSqlError(e);
+		    }
+			return false;
+		}
+		// Using the try-with-resources syntax, this will call ps.close() automatically
+	}
+	
+	private void printSqlError(SQLException e){
+	    System.out.println("SQLException: " + e.getMessage());
+	    System.out.println("SQLState: " + e.getSQLState());
+	    System.out.println("VendorError: " + e.getErrorCode());
+		throw new RuntimeException(e);
+	}
+
+	public void close() throws SQLException {
+		conn.close();
+	}
+}

src/main/java/servlet/FormGenerator.java

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+package servlet;
+/*
+ * This class provides forms to be displayed to the user
+ */
+public class FormGenerator {
+	
+
+    private String formElement(String par) {
+    	return '"' + par + '"';
+    }
+    
+    
+    /*
+     * Form for requesting user name
+     */
+    public String nameRequestForm() {
+    	String html = "Please enter your name";
+    	html += "<p> <form name=" + formElement("input");
+    	//html += " action=" + formElement(myURL); 
+    	html += " method=" + formElement("get");
+    	html += "<p> Name: <input type=" + formElement("text") + " name=" + formElement("user") + '>';
+    	html += "<p> <input type=" + formElement("submit") + "value=" + formElement("Submit") + '>';
+    	return html;
+    }
+    
+
+    /*
+     * Form for requesting success with respect to four factors
+     */
+    public String projectDataRequestForm() {
+    	String[][] variables = {
+    			{"Met operational performance", "s11"},
+                {"Met technical performance", "s12"},
+                {"Met project schedule", "s13"},
+                {"Stayed on budget", "s14"}};
+    	String html = "<p>Please assess the importance of the following factors (1-10, where 1 is least important)";    	
+    	html += "<p> <form name=" + formElement("input2");
+    	html += " method=" + formElement("get");
+    	//html += " action=" + formElement(myURL);
+    	for (int i=0; i<4; i++) {
+    		html += "<p> " + variables[i][0];
+    		html += ": <input type="+ formElement("text") + "name =" + variables[i][1]  + '>';
+    	}
+    	html += "<p> <input type=" + formElement("submit") + "value=" + formElement("Submit") + '>';
+    	return html;
+    }
+	
+}

src/main/java/servlet/HelloJsp.java

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+package servlet;
+
+import java.io.IOException;
+
+import javax.servlet.RequestDispatcher;
+import javax.servlet.ServletException;
+import javax.servlet.annotation.WebServlet;
+import javax.servlet.http.HttpServlet;
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+import java.util.*;
+
+@WebServlet("/HelloJsp")
+public class HelloJsp extends HttpServlet {
+    @Override
+    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
+        
+        RequestDispatcher requestDispatcher = this.getServletContext().getRequestDispatcher("/WEB-INF/jsp/example.jsp");
+        
+        req.setAttribute("simple", "example");
+        req.setAttribute("complex", new model.HelloJspViewModel(List.of(5,4,3,2,1)));
+        
+        requestDispatcher.include(req, resp);
+    }
+}

src/main/java/servlet/Survey.java

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+package servlet;
+
+import java.io.*;
+import java.sql.SQLException;
+
+import javax.servlet.ServletException;
+import javax.servlet.annotation.WebServlet;
+import javax.servlet.http.HttpServlet;
+import javax.servlet.http.HttpSession;
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+
+
+
+/**
+ * Servlet implementation class Survey.
+ */
+@WebServlet("/Survey")
+public class Survey extends HttpServlet {
+	private static final long serialVersionUID = 1L;
+	
+	// Define states 
+	private static final int NEED_NAME = 0;
+	private static final int NEED_PROJECT_DATA = 2;
+	
+	private FormGenerator formGenerator = new FormGenerator(); 
+	
+		
+    /**
+     * Default constructor. 
+     */
+    public Survey() {
+    }
+    
+    /*
+     * Checks first if name includes characters (i.e. is longer than zero characters) and then 
+     * if so if the name is possible to add to 
+     * the database. It is not possible to add an already existing name to the database. 
+     */
+    boolean nameOk(Database db, String name){
+    	boolean result = !name.equals("");
+    	if (result)
+    		result = db.addName(name);
+    	return result;
+    }
+    
+    /*
+     * Checks if a value entered as answer is OK. Answers should be between 1 and 10.
+     */
+    boolean valueOk(int value){
+    	return value > 0 && value <11;
+    }
+        
+	/**
+	 * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
+	 */
+	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
+		// Try with resources to create a connection, will ensure close is always called.
+		try(Database db = new Database()) {
+
+			// Get the session
+			HttpSession session = request.getSession(true);
+			
+			int state = 0;
+			String name;
+			boolean sessionShouldBeEnded = false;
+			
+			// Decide which state the session is in
+			if (session.isNew())
+				state = NEED_NAME;
+			else {
+				state = (Integer) session.getAttribute("state");
+			}
+			
+			// Get a writer, which will be used to write the next page for the user 
+			PrintWriter out = response.getWriter();
+			
+			// Start the page, print the HTML header and start the body part of the page
+			out.println("<html>");
+			out.println("<head><title> FANTASTIC WEB APPLICATION </title></head>");
+			out.println("<body>");
+			
+			switch (state){
+			case NEED_NAME: // First state: get user name
+				name = request.getParameter("user"); // get the string that the user entered in the form
+				if (name != null) {
+					if (nameOk(db, name)) {
+						session.setAttribute("name", name);  // save the name in the session
+						state = NEED_PROJECT_DATA;
+						out.println(formGenerator.projectDataRequestForm());
+					}
+					else {
+						out.println("That was not a valid name. Maybe it is already taken by someone else.");
+						out.println(formGenerator.nameRequestForm());        			
+					}
+				}else{ // name was null, probably because no form has been filled out yet. Display form.
+					out.println(formGenerator.nameRequestForm());
+				}
+				break;
+			case NEED_PROJECT_DATA:
+				int s11 = 0, s12 = 0, s13 = 0, s14 = 0;
+				name = (String) session.getAttribute("name");
+				String s11String = request.getParameter("s11");
+				String s14String = request.getParameter("s14");
+				String s12String = request.getParameter("s12");
+				String s13String = request.getParameter("s13");
+				if (s11String==null) 
+					out.println(formGenerator.projectDataRequestForm()); // first time
+				else {
+					boolean valuesOk = true;
+					try {
+						s11 = Integer.parseInt(s11String);
+						s12 = Integer.parseInt(s12String);
+						s13 = Integer.parseInt(s13String);
+						s14 = Integer.parseInt(s14String);
+					} catch (NumberFormatException e) {
+						valuesOk = false;
+					}
+					valuesOk = valuesOk && valueOk(s11) && valueOk(s12) && valueOk(s13) && valueOk(s14);
+					
+					// display the next page
+					if (valuesOk){
+						int sum = s11 + s12 + s13 + s14;
+						// This is only to show that it is possible to do something with the values. 
+						// It is of course meaningless to calculate the sum. 
+						out.println("<p> Hello " + name);
+						out.println("<p> The sum of the values you entered is " + sum);
+						sessionShouldBeEnded = true;
+					} else { 
+						out.println("The values you entered were not OK");
+						out.println(formGenerator.projectDataRequestForm());          
+					}
+				}
+				break;	        	
+			}
+			
+			// Save the state in the session until next time doGet is requested
+			session.setAttribute("state", state);
+		
+			// Print the end of the HTML-page
+			out.println("</body></html>");
+			
+			if (sessionShouldBeEnded)
+				session.invalidate();        		    
+		} catch(SQLException ex) {
+			// If Database.close for any reason fails.
+			throw new ServletException(ex);
+		}
+	}
+
+	/**
+	 * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
+	 */
+	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
+		doGet(request, response);
+	}
+}

src/main/resources/webapp/jsp/example.jsp

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+<%@ page import="model.HelloJspViewModel" %>
+<html>
+<body>
+<h2>Hello Jsp, simple data from Servlet: <%=request.getAttribute("simple")%></h2>
+    <ol>
+    <%
+        HelloJspViewModel model = (HelloJspViewModel)request.getAttribute("complex");
+        for(int el : model.getData()) { %>
+            <li>
+                <%=el%>
+                <% out.print(":" + el); // or as ordinary java code %>
+            </li>
+        <% } %>
+    </ol>  
+</body>
+</html>

src/main/resources/webapp/static/index.html

@@ -0,0 +1,27 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
+<link rel="stylesheet" href="/css/pure-min.css">
+<title>the Book Store</title>
+<style>
+    .main {
+        padding: 2em;
+        color: black;
+    }
+    </style>
+</head>
+<body>
+    <div class="main">
+    <h1>the Test Site</h1>
+
+    Welcome to this Fantastic Web Page.  
+
+    <p> The following services are available today:
+
+    <ul>
+    <li> <a href = "http://localhost:8080/Survey"> THE SURVEY</a>
+    </ul> 
+    </div>
+</body>
+</html>