Assignment -3 Source Code. Student.java

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1 import java.io.serializable; Assignment -3 Source Code Student.java public class Student implements Serializable{ public int rollno; public String name; public double marks; public Student(int rollno, String name, double marks) { this.rollno = rollno; this.name = name; this.marks = public String tostring() { return "Student [rollno=" + rollno + ", name=" + name + ", marks=" + marks + "]"; Operations.java import java.sql.connection; import java.sql.preparedstatement; import java.sql.resultset; import java.sql.sqlexception; import java.util.arraylist; public class Operations { int addstudent(student st) {

2 int rowsinserted = 0; Connection con = DB.getConnection(); PreparedStatement ps = con.preparestatement("insert into Student(rollNo, name, marks) values(?,?,?)"); ps.setint(1, st.rollno); ps.setstring(2, st.name); ps.setdouble(3, st.marks); rowsinserted = ps.executeupdate(); con.close(); catch (SQLException e) { return rowsinserted; int deletestudent(int rollno) { int rowsdeleted = 0; Connection con = DB.getConnection(); PreparedStatement ps = con.preparestatement("delete from Student where rollno =?"); ps.setint(1, rollno); rowsdeleted = ps.executeupdate(); con.close(); catch (SQLException e) {

3 return rowsdeleted; Student searchstudent(int rollno){ Student st = null; Connection con = DB.getConnection(); PreparedStatement ps = con.preparestatement("select * from Student where rollno =?"); ps.setint(1, rollno); ResultSet rs = ps.executequery(); if(rs.next()){ st = new Student(rs.getInt("rollNo"), rs.getstring("name"), rs.getdouble("marks")); con.close(); catch (SQLException e) { return st; ArrayList<Student> failedstudents(double pm){ ArrayList<Student> failed = new ArrayList<Student>(); Connection con = DB.getConnection();

4 PreparedStatement ps = con.preparestatement("select * from Student where marks <?"); ps.setdouble(1, pm); ResultSet rs = ps.executequery(); while(rs.next()){ Student st = new Student(rs.getInt("rollNo"), rs.getstring("name"), rs.getdouble("marks")); failed.add(st); con.close(); catch (SQLException e) { return failed; ArrayList<Student> display(){ ArrayList<Student> alldata = new ArrayList<Student>(); Connection con = DB.getConnection(); PreparedStatement ps = con.preparestatement("select * from Student"); ResultSet rs = ps.executequery(); while(rs.next()){ Student st = new Student(rs.getInt("rollNo"), rs.getstring("name"), rs.getdouble("marks")); alldata.add(st); con.close();

5 catch (SQLException e) { return alldata; Client.java import java.io.datainputstream; import java.io.dataoutputstream; import java.io.ioexception; import java.io.objectinputstream; import java.io.objectoutputstream; import java.net.socket; import java.util.arraylist; import java.util.scanner; public class Client public static void main(string[] args) { // TODO Auto-generated method stub Scanner sc = new Scanner(System.in); Socket cs = new Socket("localhost", 5000); DataOutputStream dout = new DataOutputStream(cs.getOutputStream()); DataInputStream din = new DataInputStream(cs.getInputStream()); ObjectOutputStream oout = new ObjectOutputStream( cs.getoutputstream());

6 ObjectInputStream oin = new ObjectInputStream(cs.getInputStream()); ArrayList<Student> al =null; int ch; String name; int rollno; double marks; // Student class of Client Student st = null; while (true) { System.out.print("\n***** Select Operation *****\n"); System.out.print("\n\t1. Add Student\n\t2. Delete Student\n\t3. Search Student\n\t4. Failed Student\n\t5. Display\n\t6. Exit"); System.out.print("\nEnter choice: "); ch = sc.nextint(); dout.writeint(ch); switch (ch) { case 1: System.out.print("\nEnter Roll No - "); rollno = sc.nextint(); System.out.print("\nEnter Name - "); name = sc.next(); System.out.print("\nEnter Marks - "); marks = sc.nextdouble(); st = new Student(rollNo, name, marks); oout.writeobject(st); al = (ArrayList<Student>) oin.readobject(); System.out.print("\nAdded Succesfully!!!\nUpdated Students List -> \n");

7 s.name + " -:- " + s.marks); for(student s : al){ System.out.println(s.rollNo + " -:- " + break; case 2: System.out.print("\nEnter rollno to be deleted : "); rollno = sc.nextint(); dout.writeint(rollno); al = (ArrayList<Student>) oin.readobject(); System.out.print("\nAdded Succesfully!!!\nUpdated Students List -> \n"); for(student s : al){ System.out.println(s.rollNo + " -:- " + s.name + " -:- " + s.marks); break; case 3: System.out.print("\nEnter rollno to be searched : "); rollno = sc.nextint(); dout.writeint(rollno); st = (Student) oin.readobject(); if (st!= null) { System.out.print("\nSearched Student -> " + st); else { System.out.println("User not found!!!"); break; case 4:

8 "); System.out.print("\nEnter passing marks : double pm = sc.nextdouble(); dout.writedouble(pm); \n"); al = (ArrayList<Student>) oin.readobject(); System.out.print("\nFailed Students List -> for(student s : al){ System.out.println(s.rollNo + " -:- " + s.name + " -:- " + s.marks); break; case 5: al = (ArrayList<Student>) oin.readobject(); System.out.print("\nStudents List -> \n"); for(student s : al){ System.out.println(s.rollNo + " -:- " + s.name + " -:- " + s.marks); break; if (ch == 6) { System.out.println(din.readUTF()); break; catch (IOException e) { catch (ClassNotFoundException e) {

9 import java.sql.connection; import java.sql.drivermanager; import java.sql.sqlexception; DB.java public class DB { static Connection con = null; public static Connection getconnection() { Class.forName("com.mysql.jdbc.Driver"); con = DriverManager.getConnection( "jdbc:mysql://localhost:3306/xyz", "root", "root123"); catch (SQLException e) { catch (ClassNotFoundException e) { return con; public static void closeconnection(){ con.close(); catch (SQLException e) {

10 ServerDemo.java import java.io.datainputstream; import java.io.dataoutputstream; import java.io.ioexception; import java.io.objectinputstream; import java.io.objectoutputstream; import java.net.serversocket; import java.net.socket; import java.util.arraylist; import java.util.concurrent.executorservice; import java.util.concurrent.executors; public class ServerDemo { int port; ServerSocket ss = null; Socket cs = null; Operations obj = null; ExecutorService pool = null; public ServerDemo(int port){ this.port = port; obj = new Operations(); pool = Executors.newFixedThreadPool(5); public void startserver(){ //creating one server socket ss = new ServerSocket(5000); //for accepting multiple clients while(true){ System.out.println("Server waiting for client..."); cs = ss.accept();

11 System.out.println("Got one client.creating thread for this client..."); ServerThreadBody runnable = new ServerThreadBody(cs, obj, this); //assigning thread to pool pool.execute(runnable); catch (IOException e) { public static void main(string[] args) { // TODO Auto-generated method stub new ServerDemo(5000).startServer(); class ServerThreadBody implements Runnable{ ServerDemo server = null; Socket cs = null; DataOutputStream dout = null; DataInputStream din = null; ObjectOutputStream oout = null; ObjectInputStream oin = null; Student st = null; Operations obj = null; { ServerThreadBody(Socket cs, Operations obj, ServerDemo server) // TODO Auto-generated constructor stub

12 this.cs = cs; this.obj = obj; this.server = public void run() { // TODO Auto-generated method stub try{ dout = new DataOutputStream(cs.getOutputStream()); din = new DataInputStream(cs.getInputStream()); oout = new ObjectOutputStream( cs.getoutputstream()); oin = new ObjectInputStream(cs.getInputStream()); int rollno; while (true) { client int ch = din.readint(); if (ch == 1) { // Reading com.server.student Object from st = (Student) oin.readobject(); // Calling addstudent() of com.server.operations class obj.addstudent(st); oout.writeobject(obj.display()); else if (ch == 2) { // Reading rollno from client for deleting

13 rollno = din.readint(); // Calling addstudent() of com.server.operations class obj.deletestudent(rollno); oout.writeobject(obj.display()); else if (ch == 3) { // Reading rollno from client for deleting rollno = din.readint(); // Calling addstudent() of com.server.operations class st = obj.searchstudent(rollno); if (st!= null) { // Writing searched Student object back to client oout.writeobject(st); else { // Writing ArrayList al object back to client oout.writeobject(null); else if (ch == 4) { // Reading rollno from client for deleting double pm = din.readdouble(); // Calling addstudent() of com.server.operations class ArrayList<Student> failed = obj.failedstudents(pm); oout.writeobject(failed); else if (ch == 5) { oout.writeobject(obj.display()); else if(ch == 6){

14 dout.writeutf("bye Bye Client from server!!! "); System.out.println("Socket Closed!!!"); cs.close(); break; catch (IOException e) { catch (ClassNotFoundException e) { *********************************************************

Assignment-1 Final Code. Student.java

Assignment-1 Final Code. Student.java package com.ds.assgn1a; public class Student { public int rollno; public String name; public double marks; Assignment-1 Final Code Student.java public Student(int rollno, String name, double marks){ this.rollno