Java基于TCP的Socket编程练习 (一)

环境：Notpad ++ 6.0 + JDK 6.0.31

问题：使用套接字编写客户—服务器程序，实现客户—服务器交互计算。客户将三角形3个边的长度发给服务器，服务器把计算出的三角形的面积返回给客户。

解决：利用Java的Socket编程。客户端发送数据，服务端接收数据，并进行相应的处理。

代码：

TcpServer.java：

[java] import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.net.ServerSocket;
import java.net.Socket;

public class TcpServer {
public static final int NUM = 3;
public static void main(String args[]){

TcpServer tcpServer = new TcpServer();
try {
ServerSocket server = null;

try {
server = new ServerSocket(4700);
} catch (Exception e) {
e.printStackTrace();
}

Socket socket = null;
try {
socket = server.accept();
} catch (Exception e) {
e.printStackTrace();
}

String line = "";
double a[] = new double[NUM];
BufferedReader is = new BufferedReader(new InputStreamReader
(socket.getInputStream()));

System.out.println("从客户端接收三角形的三条边：");
for (int i = 0; i < a.length; i++) {
line = is.readLine();
a[i] = Double.parseDouble(line);
}


System.out.println("三角形的面积是：" + tcpServer.countarea(a));

is.close();//关闭读取流
socket.close();//关闭Socket
server.close();//关闭ServerSocket
} catch (Exception e) {
e.printStackTrace();
}
}


//计算三角形面积的方法
public double countarea(double a[]){
double area = 0.0;

double temp = 0.0;
double aside = 0.0;
double bside = 0.0;
double cside = 0.0;
aside = a[0];
bside = a[1];
cside = a[2];
temp = a[0] + a[1] + a[2];
temp = temp / 2;



area = Math.sqrt(temp * (temp - aside) * (temp - bside) * (temp - cside));

return area;
}
}
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.net.ServerSocket;
import java.net.Socket;

public class TcpServer {
public static final int NUM = 3;
public static void main(String args[]){

TcpServer tcpServer = new TcpServer();
try {
ServerSocket server = null;

try {
server = new ServerSocket(4700);
} catch (Exception e) {
e.printStackTrace();
}

Socket socket = null;
try {
socket = server.accept();
} catch (Exception e) {
e.printStackTrace();
}

String line = "";
double a[] = new double[NUM];
BufferedReader is = new BufferedReader(new InputStreamReader
(socket.getInputStream()));

System.out.println("从客户端接收三角形的三条边：");
for (int i = 0; i < a.length; i++) {
line = is.readLine();
a[i] = Double.parseDouble(line);
}


System.out.println("三角形的面积是：" + tcpServer.countarea(a));

is.close();//关闭读取流
socket.close();//关闭Socket
server.close();//关闭ServerSocket
} catch (Exception e) {
e.printStackTrace();
}
}


//计算三角形面积的方法
public double countarea(double a[]){
double area = 0.0;

double temp = 0.0;
double aside = 0.0;
double bside = 0.0;
double cside = 0.0;
aside = a[0];
bside = a[1];
cside = a[2];