Java TCP-based socket programming exercises

Environment: Notpad + + 6.0 + JDK 6.0.31

Issue: Use sockets to write client-server programs that enable client-server interaction calculations. The customer sends the length of the triangle 3 sides to the server, and the server returns the area of the computed triangle to the customer.

WORKAROUND: Use Java socket programming. The client sends the data, and the server receives the data and handles it accordingly.

Code:

Tcpserver.java:

[Java]View PlainCopy

2. Import Java.io.BufferedReader;
4. Import Java.io.InputStreamReader;
6. Import Java.net.ServerSocket;
8. Import Java.net.Socket;
12. Public class TCPServer {
14. public static final int NUM = 3;
16. public static void Main (String args[]) {
20. TCPServer tcpserver = new TCPServer ();
22. try {
24. ServerSocket server = null;
28. try {
30. Server = new ServerSocket (4700);
32. } catch (Exception e) {
34. E.printstacktrace ();
36. }
40. Socket socket = null;
42. try {
44. Socket = Server.accept ();
46. } catch (Exception e) {
48. E.printstacktrace ();
50. }
54. String line = "";
56. double a[] = new double[num];
58. BufferedReader is = new BufferedReader (new InputStreamReader
60. (Socket.getinputstream ()));
64. System.out.println ("Three sides of the triangle received from the client:");
66. For (int i = 0; i < a.length; i++) {
68. line = Is.readline ();
70. A[i] = double.parsedouble (line);
72. }
78. System.out.println ("The area of the triangle is:" + Tcpserver.countarea (a));
82. Is.close (); //Turn off read stream
84. Socket.close (); //Close socket
86. Server.close (); //Close ServerSocket
88. } catch (Exception e) {
90. E.printstacktrace ();
92. }
94. }
100. //method for calculating triangular area
102. public Double Countarea (double a[]) {
104. Double area = 0.0;
108. Double temp = 0.0;
110. double aside = 0.0;
112. double bside = 0.0;
114. double cside = 0.0;
116. aside = a[0];
118. Bside = a[1];
120. Cside = a[2];
122. temp = a[0] + a[1] + a[2];
124. temp = temp/ 2;
132. Area = MATH.SQRT (temp * (temp-aside) * (temp-bside) * (temp-cside));
136. return area;
138. }
140. }

Tcpclient.java

[Java]View PlainCopy

2. Import Java.io.BufferedReader;
4. Import Java.io.InputStreamReader;
6. Import Java.io.PrintWriter;
8. Import Java.net.Socket;
10. Public class TcpClient {
14. public static final int NUM = 3;
16. public static void Main (String args[]) {
18. try {
20. Socket socket = new socket ("127.0.0.1", 4700);
22. BufferedReader sin = new BufferedReader (new InputStreamReader (system.in));
26. PrintWriter OS = new PrintWriter (Socket.getoutputstream ());
30. System.out.println ("Three sides from the client receive triangle sent to the server:");
32. System.out.println ("Please enter 3 sides:");
34. String ReadLine = "";
36. For (int i = 0; i < NUM; i++) {
38. Os.flush ();
40. ReadLine = Sin.readline ();
42. Os.println (ReadLine);
44. }
48. Os.close ();
50. Socket.close ();
54. } catch (Exception e) {
56. E.printstacktrace ();
58. }
60. }
64. }

Run:

The client program (Tcpclient.java) and the server-side program (TCPSERVER.JAVA) are compiled separately, and then open two CMD consoles, first run the server, then run the client, enter the data on the client, and then you can see the results on the server.

Operating effect:

Service side:

Client:

Download resources: www.makeru.com.cn/?t=12

Java TCP-based socket programming exercises