Note1: ==> Client chọn menu
1: Tìm tất cả
<Search Info>
2: Tìm theo tên
<Search as Name>
Trước tiên:
Tạo một folder làm packet cho các file bên trong.
- Tạo 2 file :
- 1: Client
- 2: Server - ok bây giờ cùng phân tích
+ File Server ==> - Add or import packet! ! For example: packet <name_folder> # after ==> .*" add or import !!! ".* - "import java.io.IOException; - import java.net.DatagramPacket; - import java.net.DatagramSocket; - import java.net.InetAddress; - import java.net.SocketException; - import java.net.UnknownHostException; - import java.util.Scanner; "
| First Header | Second Header |
|---|---|
| use class | add library support |
public class ClientTCP {
public static void main(String[] args) throws SocketException,
UnknownHostException, IOException {
DatagramSocket client = new DatagramSocket();
InetAddress address = InetAddress.getByName("localhost");
Scanner scanner = new Scanner(System.in);
System.out.println("================Menu================");
System.out.println("1: Show info");
System.out.println("2: Search by name");
int choose = scanner.nextInt();
String result = "";
switch(choose) {
case 1: {
result = choose + " " ;
break;
}
case 2: {
System.out.println("Enter name: ");
String name = scanner.nextLine();
result = choose + " " + name;
result = name;
break;
}
}
byte[] send_data = result.getBytes();
DatagramPacket datagramSend_Packet = new DatagramPacket(send_data, send_data.length, address, 9999);
client.send(datagramSend_Packet);
byte[] receive_data = new byte[1024];
DatagramPacket datagramReceive_Packet = new DatagramPacket(receive_data, receive_data.length);
client.receive(datagramReceive_Packet);
System.out.println("Result: " + new String(datagramReceive_Packet.getData()));
client.close();
scanner.close();
}
}
- as seen, we are use DatagramSocket as Client default
- after use InetAddress as ip address with localhost://12700 on your computer
- and using Loop || switch - case
switch(choose) { case 1: { result = choose + " " ; break; } case 2: { System.out.println("Enter name: "); String name = scanner.nextLine(); result = choose + " " + name; result = name; break; } }
// Now we go to Server ==>- Folder JavaQLSV
-
Tính tổng vả hiệu từ Client --> Server
-
Sử dụng Phương thức UDP
- Trước tiên là Client =============================>
-
public class ClientUDP {
public static void main(String[] args) throws IOException, SocketException {
DatagramSocket client = new DatagramSocket();
Scanner scanner = new Scanner(System.in);
System.out.println("================MENU====================");
System.out.println("1.Sum two numbers");
System.out.println("2.Subtraction of two number");
String result = "";
int choose = scanner.nextInt();
scanner.nextLine();
System.out.print("Enter number a: ");
int a = Integer.parseInt(scanner.nextLine());
System.out.print("Enter number b: ");
int b = Integer.parseInt(scanner.nextLine());
switch (choose) {
case 1: {
result = "sum " + a + " " + b;
System.out.println(result);
break;
}
case 2: {
result = "Subtraction " + a + " " + b;
System.out.println(result);
break;
}
default: {
break;
}
}
InetAddress address = InetAddress.getLocalHost();
byte[] send_data = result.getBytes();
byte[] receive_data = new byte[1024];
DatagramPacket sent_packet = new DatagramPacket(send_data, send_data.length, address, 9999);
DatagramPacket receive_packet = new DatagramPacket(receive_data, receive_data.length);
client.send(sent_packet);
client.receive(receive_packet);
System.out.println("Result: " + new String(receive_packet.getData()));
scanner.close();
client.close();
}
} - After || We Have Server !!!
-
==========================>
public class ServerUDP { public static void main(String[] args) throws IOException, SocketException { DatagramSocket server = new DatagramSocket(9999); byte[] receive_data = new byte[1024]; DatagramPacket receive_packet = new DatagramPacket(receive_data, receive_data.length); server.receive(receive_packet); String s_receive = new String(receive_packet.getData(), 0, receive_packet.getLength()); // "tong 3 5" -> ["tong", "3", "5"]; a = 3, b = 5 String[] data = s_receive.split(" "); int result = 0; int a = Integer.parseInt(data[1]); int b = Integer.parseInt(data[2]); switch(data[0]) { case "sum": {; result = a + b; break; } case "Subtraction": { result = a - b; break; } default: { break; } } byte[] send_data = String.valueOf(result).getBytes(); DatagramPacket send_packet = new DatagramPacket(send_data, send_data.length, receive_packet.getAddress(), receive_packet.getPort()); server.send(send_packet); server.close(); } }
System.out.println("=================Menu====================");
System.out.println("1.Hien thi tat ca nha");
System.out.println("2.Tim kiem");
System.out.println("3.Them nha");
System.out.println("4.Mua nha");
System.out.println("5.Thoat");
// Import libraly
// + import java.io.IOException;
// + import java.net.DatagramPacket;
// + import java.net.DatagramSocket;
// + import java.net.InetAddress;
// + import java.net.SocketException;
// + import java.net.UnknownHostException;
// + import java.util.Scanner;// This is condition
if (choose == 1) {
result = choose + " Show_all_home";
client(result);
}
if (choose == 2) {
result = choose + " Search";
System.out.println("1.Search by house number");
System.out.println("2.search by status");
System.out.print("Choose: ");
int search = Integer.parseInt(scanner.nextLine());
if (search == 1) {
System.out.print("Enter the house number you want to search for: ");
int sonha = Integer.parseInt(scanner.nextLine());
result = choose + " Search " + search + " " + sonha;
}
if (search == 2) {
System.out.print("Enter current status: ");
String status = scanner.nextLine();
result = choose + " search " + search + " " + status;
}
client(result);
}
if (choose == 3) {
System.out.print("Enter the house number: ");
int sonha = Integer.parseInt(scanner.nextLine());
System.out.print("Enter house price: ");
int gianha = Integer.parseInt(scanner.nextLine());
result = choose + " add_home " + sonha + " " + gianha;
client(result);
}
if (choose == 4) {
System.out.print("Choose house number: ");
int sonha = Integer.parseInt(scanner.nextLine());
result = choose + " Bye_home " + sonha;
client(result);
}
if (choose == 5) {
System.out.println("Ok Bye!!!=======================> Lol");
break;
} After we need !!! function byside String result
public static void client(String result) throws IOException, UnknownHostException {
DatagramSocket client = new DatagramSocket();
InetAddress address = InetAddress.getLocalHost();
byte[] send_data = result.getBytes();
byte[] receive_data = new byte[1024];
DatagramPacket send_packet = new DatagramPacket(send_data, send_data.length, address, 9999);
DatagramPacket receive_packet = new DatagramPacket(receive_data, receive_data.length);
client.send(send_packet);
client.receive(receive_packet);
String data = new String(receive_packet.getData(), 0, receive_packet.getLength());
System.out.println("\n" + data);
client.close();
} With Server ==>
public static void main(String[] args) throws IOException, SocketException {
DatagramSocket server = new DatagramSocket(9999);
while (true) {
File file = new File("home.dat");
if (!file.exists()) {
file.createNewFile();
}
BufferedReader reader = new BufferedReader(new FileReader(file));
byte[] receive_data = new byte[1024];
DatagramPacket receive_packet = new DatagramPacket(receive_data, receive_data.length);
server.receive(receive_packet);
String data = new String(receive_packet.getData(), 0, receive_packet.getLength());
String[] a = data.split(" ");
String b = reader.readLine();
String resule = "";
if (a[0].equals("1")) {
resule = "Show All Info House \n";
while (b != null) {
resule += b + "\n";
b = reader.readLine();
}
} else if (a[0].equals("2")) {
if (a[2].equals("1")) {
System.out.println("Search by house number");
while (b != null) {
String[] s = b.split(" ");
if (s[0].equals(a[3])) {
System.out.println("Duplicate house number");
resule += b + "\n";
}
b = reader.readLine();
}
}
if (a[2].equals("2")) {
System.out.println("Search by status");
while (b != null) {
String[] s = b.split(" ");
if (s[2].equals(a[3])) {
resule += b + "\n";
}
if (!s[2].equals(a[3])) {
resule = "No result";
}
b = reader.readLine();
}
}
} else if (a[0].equals("3")) {
String addHome = "";
while (b != null) {
addHome += b + "\n";
b = reader.readLine();
}
addHome += a[2] + " " + a[3] + " false";
createFile(addHome);
resule = "Add successfully";
} else if (a[0].equals("4")) {
String muaNha = "";
while (b != null) {
String[] s = b.split(" ");
if (s[0].equals(a[2])) {
if (s[2].equals("true")) {
resule = "House bought";
} else {
muaNha += s[0] + " " + s[1] + " " + "true" + "\n";
resule = "Bye successfully";
}
} else {
muaNha += b + "\n";
}
b = reader.readLine();
}
createFile(muaNha);
} else if (a[0].equals("5")) {
break;
}
reader.close();
byte[] send_data = resule.getBytes();
DatagramPacket send_packet = new DatagramPacket(send_data, send_data.length, receive_packet.getAddress(),
receive_packet.getPort());
server.send(send_packet);
reader.close();
}
} // importain!
public static void createFile(String s) throws IOException {
File file = new File("home.dat");
if (!file.exists()) {
file.createNewFile();
}
FileOutputStream fileOutputStream = new FileOutputStream(file);
fileOutputStream.write(s.getBytes());
fileOutputStream.close();
}!!! Note that !!! Nâng cao sử dụng thêm đọc ghi file! Sinh viên tự đưa ra yêu cầu hợp lý
System.out.println("=================Menu====================");
System.out.println("1.Hien thi toan bo danh sach hoc sinh");
System.out.println("2 Hien thi danh sach hoc sinh co hoc bong");
System.out.println("3.Nhap diem cho hoc sinh");
System.out.println("4.Thoat");
- Sử dụng UDP chat Client với Server
+ Client gửi tin nhắn sang cho bên phía Server
- Server nhận được tín hiệu và trả lại tin nhắn phản hồi cho Client@@ Tính tổng @@
- Client nhập 2 số và gửi đi sang phía Server
- Server nhận được tín hiệu và kết quả về phía client- Resolve :
-
Server ==>
public class Server { public static void main(String[] args) throws SocketException, IOException { DatagramSocket myserver = new DatagramSocket(7); byte[] receive_data = new byte[1024]; DatagramPacket pack_receive = new DatagramPacket(receive_data, receive_data.length); myserver.receive(pack_receive); int s1 = Integer.parseInt(new String(pack_receive.getData(),0, pack_receive.getLength())); System.out.println("Server nhan so 1:"+s1); int s2 = Integer.parseInt(new String(pack_receive.getData(),0, pack_receive.getLength())); System.out.println("Server nhan so 1:"+s2); String a = String.valueOf(s1+s2); byte[] send_data = a.getBytes(); DatagramPacket send_packet = new DatagramPacket(send_data, send_data.length, pack_receive.getAddress(), pack_receive.getPort()); myserver.send(send_packet); } } -
Client ==>
public static void main(String[] args) throws SocketException, UnknownHostException, IOException { DatagramSocket myclient = new DatagramSocket(); Scanner sc = new Scanner(System.in); System.out.println("nhap so thu 1 :"); String a1 = sc.nextLine(); System.out.println("nhap so thu 2 :"); String a2 = sc.nextLine(); byte[] send_data1 =a1.getBytes(); byte[] send_data2 =a1.getBytes(); InetAddress ip = InetAddress.getByName("localhost"); DatagramPacket send_pack1 = new DatagramPacket(send_data1, send_data1.length, ip, 7); myclient.send(send_pack1 ); DatagramPacket send_pack2 = new DatagramPacket(send_data2, send_data2.length, ip, 7); myclient.send(send_pack2 ); byte[] receive_data = new byte[1024]; DatagramPacket pack_receive = new DatagramPacket(receive_data, receive_data.length); myclient.receive(pack_receive); System.out.println("Client nhan kq tu server:"+new String(pack_receive.getData()));}
-
- Kiểm tra sô chẵn lẻ
- Client nhập vào số bất kỳ , yêu cầu gửi đi sang bên phía Server
- Server nhận được tín hiệu , kiểm tra sau đó phản hôi lại cho bên Client
! Tiền điều kiện <sử dụng sao cho hợp lý>- Lúc này Server nhận thấy số chẵn sẽ gửi yêu cầu về Client || Tính tổng hoặc hiệu
- Lúc này Server nhận thấy số lẻ sẽ gửi yêu cầu về Client || Tính tổng hoặc hiệu
- Phân tán số liệu
- Client nhập vào 1 số bất kỳ
- Server nhận được và đóng gói nó sau đó giải nó ra và gửi cho 1 mã số nhị phân
! Làm bài tương tư như UDP nhưng sử dụng giao thức TCP