Answer to Question #291949 in Java | JSP | JSF for Ali

Question

Java socket related classes to create a dictionary client To get familiar with the socket library in Java,

·    Requesting, receiving, parsing and returning a list of matching strategies supported by the server. The protocol allows a client to retrieve a list of matches (suggestions) based on a keyword, and the strategy is used to indicate how these keywords are used to present actual dictionary entries. Examples include prefix matches (all words that start with a prefix), regular expressions, entries with similar sounding words, etc. In the interface, the user will have the option of selecting a specific strategy for matching, with prefix match being the default.

·    Requesting, receiving, parsing and returning a list of matches based on a keyword, a matching strategy and a database. This list of matches will be used in the interface to suggest entries as they type a word.

Answer 1

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.ServerSocket;
import java.net.Socket;

public class Server {
    public static String[] dictionaries = {"English", "Thesaurus", "English-French", "Dictionary of acronyms"};

    public static void handler(Socket socket) {
        Thread thread = new Thread(() -> {
            try (BufferedReader in = new BufferedReader(new InputStreamReader(socket.getInputStream()));
                 PrintWriter out = new PrintWriter(socket.getOutputStream(), true)) {
                String line;
                out.println("HELLO");
                while ((line = in.readLine()) != null) {
                    if (line.equals("LIST")) {
                        StringBuilder builder = new StringBuilder();
                        for (String dictionary : dictionaries) {
                            builder.append(dictionary).append(",");
                        }
                        out.println("LIST > " + builder);
                    } else if (line.equals("QUIT")) {
                        out.println("BYE");
                    }
                }
            } catch (Exception e) {
                e.printStackTrace();
            }

        });
        thread.setDaemon(true);
        thread.start();
    }

    public static void main(String[] args) {
        try (ServerSocket serverSocket = new ServerSocket(2628)) {
            while (true) {
                handler(serverSocket.accept());
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.Socket;
import java.util.Scanner;

public class Client {

    public static void writer(PrintWriter out) {
        Thread thread = new Thread(() -> {
            Scanner in = new Scanner(System.in);
            while (true) {
                out.println(in.nextLine());
            }
        });
        thread.setDaemon(true);
        thread.start();
    }

    public static void main(String[] args) {
        try (Socket socket = new Socket("localhost", 2628)) {
            BufferedReader in = new BufferedReader(new InputStreamReader(socket.getInputStream()));
            PrintWriter out = new PrintWriter(socket.getOutputStream(), true);
            writer(out);
            String line;
            while ((line = in.readLine()) != null) {
                if (line.equals("HELLO")) {
                    System.out.println(line);
                } else if (line.startsWith("LIST > ")) {
                    String[] dictionaries = line.split(" > ")[1].split(",");
                    System.out.println("Dictionaries:");
                    for (int i = 1; i < dictionaries.length; i++) {
                        System.out.println(dictionaries[i]);
                    }
                } else if (line.equals("BYE")) {
                    System.out.println(line);
                    socket.close();
                }
            }
        } catch (Exception e) {
        }
    }
}