14-5 网络编程 ---- TCP网络编程(2)例子1
例子1:客户端发送信息给服务端,服务端将数据显示在控制台上
运行步骤:
(1)启动server
(2)再启动client
(3)之后在server会显示发送来的信息
(这里的127.0.0.1为本机,即本机给本机发信息,由本机接收)
代码:
package java1;
import org.junit.Test;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.InetAddress;
import java.net.ServerSocket;
import java.net.Socket;
//实现TCP的网络编程
//例子1:客户端发送信息给服务端,服务端将数据显示在控制台上
public class TCPTest1 {
//客户端
@Test
public void client() {
Socket socket = null;
OutputStream os = null;
try {
//1.创建Socket对象,指明服务器端的ip和端口号
InetAddress inet = InetAddress.getByName("127.0.0.1");
socket = new Socket(inet, 8888);
//2.获取一个输出流,用于输出数据
os = socket.getOutputStream();
//3.写出数据的操作
os.write("这里是客户端,收到请回复!".getBytes());
} catch (IOException e) {
e.printStackTrace();
} finally {
//4.资源的关闭
if (os != null) {
try {
os.close();
} catch (IOException e) {
e.printStackTrace();
}
}
if (socket != null) {
try {
socket.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
//服务端(先启动)
@Test
public void server() {
ServerSocket ss = null;
Socket socket = null;
InputStream is = null;
ByteArrayOutputStream baos = null;
try {
//1.创建服务器端的ServerSocket,指明自己的端口号
ss = new ServerSocket(8888);
//2.调用accept()表示接收来自于客户端的socket
socket = ss.accept();
//3.获取输入流
is = socket.getInputStream();
//4.读取输入流中的数据
//不建议这样写,可能会有乱码
// byte[] buffer = new byte[1024];
// int len;
// while((len = is.read(buffer)) != -1){
// String str = new String(buffer,0,len);
// System.out.print(str);
// }
baos = new ByteArrayOutputStream();
byte[] buffer = new byte[5];
int len;
while ((len = is.read(buffer)) != -1) {
baos.write(buffer, 0, len);
}
System.out.println(baos.toString());
System.out.println("收到了来自于: " + socket.getInetAddress().getHostAddress() + " 的数据");
} catch (IOException e) {
e.printStackTrace();
} finally {
//5.关闭资源
if (baos != null) {
try {
baos.close();
} catch (IOException e) {
e.printStackTrace();
}
}
if (is != null) {
try {
is.close();
} catch (IOException e) {
e.printStackTrace();
}
}
if (socket != null) {
try {
socket.close();
} catch (IOException e) {
e.printStackTrace();
}
}
if (ss != null) {
try {
ss.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
}