Hi, i'm sorry but i'm not sure that we will do your homework...
check this: http://www.unix.org.ua/orelly/java-ent/servlet/index.htm and http://java.sun.com/products/servlet/articles/tutorial/ to understand how servlets work. good luck S. > Dear All, > The following program uses socket. How can I convert it to servlet? Please > help. Thank you. > > Yours Sincerely, > TEH > > import java.io.*; > import java.net.*; > import java.awt.*; > import java.awt.event.*; > > public class Exercise18_3Server { > // Declare a random access file > RandomAccessFile raf = null; > public static void main(String args[]) { > new Exercise18_3Server(); > } > public Exercise18_3Server() { > // Open the local file on the server side > try { > // Open the file if the file exists, create a new file if the file does > not exist > raf = new RandomAccessFile("student.dat", "rw"); > } > catch(IOException e) { > System.out.print("Error: " + e); > System.exit(0); > } > // Establish server socket > try { > // Create a server socket > ServerSocket ss = new ServerSocket(8000); > int count = 1; > ThreadGroup tg = new ThreadGroup("serving clients"); > while (true) { > if (tg.activeCount() < 2) { > // Connect to a client > Socket s = ss.accept(); > // Start a new thread to register a client > Thread t = new Thread(tg, new RegistrationThread(s, count++)); > t.start(); > System.out.println(tg.activeCount() + " active threads"); > } > else { > try {Thread.sleep(200); } > catch (InterruptedException ex) { } > } > } > } > catch (IOException e) { > System.err.println(e); > } > } > // Define a thread to process the client registration > class RegistrationThread extends Thread { > private Socket sock; // The socket to serve a client > private int num; //the socket label > // The file to store the records > // Buffer reader to get input from the client > private BufferedReader in; > private PrintWriter out; > public RegistrationThread(Socket sock, int num) { > this.sock = sock; > this.num = num; > System.out.println("Thread " + num + " running"); > // Create an input stream to receive data from a client > try { > in = new BufferedReader > (new InputStreamReader(sock.getInputStream())); > out = new PrintWriter(sock.getOutputStream(), true); > } > catch(IOException ex) { > System.out.println("Error " + ex); > } > } > public void run() { > String name; > String street; > String city; > String state; > String zip; > try { > // Get command > String command = in.readLine(); > if (command.equals("Register")) { > // Receive data from the client > name = new String(in.readLine()); > street = new String(in.readLine()); > city = new String(in.readLine()); > state = new String(in.readLine()); > zip = new String(in.readLine()); > // Display data received > System.out.println("The following data received from the client"); > System.out.println("name: " + name); > System.out.println("street: " + street); > System.out.println("city: " + city); > System.out.println("state: " + state); > System.out.println("zip: " + zip); > // Create a student instance > Student s = new Student(name, street, city, state, zip); > // Append it to "student.dat" > raf.seek(raf.length()); > s.writeStudent(raf); > } > else if (command.equals("View")) { > name = new String(in.readLine()); > Student s = search(name); > if (s == null) { > out.println("not found"); > } > else { > out.println("found"); > out.println(s.getStreet()); > out.println(s.getCity()); > out.println(s.getState()); > out.println(s.getZip()); > } > } > } > catch (IOException e) { > System.err.println(e);} > } > public Student search(String name) { > Student s = new Student(); > try { > raf.seek(0); > long length = raf.length(); > while (raf.getFilePointer() < length) { > s.readStudent(raf); > if (name.trim().equals(s.getName().trim())) return s; > System.out.println("Find anything?" + name + " " + s.getName()); > } > } > catch(IOException ex) { > System.out.print("Error: " + ex); > } > return null; > } > } > class Student { > private String name; > private String street; > private String city; > private String state; > private String zip; > // The size of five string fields in the record > final int NAME_SIZE = 32; > final int STREET_SIZE = 32; > final int CITY_SIZE = 20; > final int STATE_SIZE = 2; > final int ZIP_SIZE = 5; > // The total size of the record in bytes, a Unicode > // character is 2 bytes size.*/ > final int RECORD_SIZE = > (NAME_SIZE + STREET_SIZE + CITY_SIZE + STATE_SIZE + ZIP_SIZE); > Student() { > } > Student(String name, String street, String city, > String state, String zip ) { > this.name = name; > this.street = street; > this.city = city; > this.state = state; > this.zip = zip; > } > public String getName() { > return name; > } > public String getStreet() { > return street; > } > public String getCity() { > return city; > } > public String getState() { > return state; > } > public String getZip() { > return zip; > } > public void writeStudent(DataOutput out) throws IOException { > FixedLengthStringIO.writeFixedLengthString( > name, NAME_SIZE, out); > FixedLengthStringIO.writeFixedLengthString( > street, STREET_SIZE, out); > FixedLengthStringIO.writeFixedLengthString( > city, CITY_SIZE, out); > FixedLengthStringIO.writeFixedLengthString( > state, STATE_SIZE, out); > FixedLengthStringIO.writeFixedLengthString( > zip, ZIP_SIZE, out); > } > public void readStudent(DataInput in) throws IOException { > name = FixedLengthStringIO.readFixedLengthString( > NAME_SIZE, in); > street = FixedLengthStringIO.readFixedLengthString( > STREET_SIZE, in); > city = FixedLengthStringIO.readFixedLengthString( > CITY_SIZE, in); > state = FixedLengthStringIO.readFixedLengthString( > STATE_SIZE, in); > zip = FixedLengthStringIO.readFixedLengthString( > ZIP_SIZE, in); > } > } > } > > > Fussy? 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