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1、TCP通信原理
TCP通信协议是一种可靠的网络协议,它在通信的两端各建立一个Scoket对象,从而在通信两端形成网络虚拟链路,一旦建立了虚拟的网络链路,两端的程序就可以通过虚拟链路进行通信
Java对基本TCP协议的网络提供了良好的封装,使用Socket对象来代表两端的通信端口,并通过Socket产生IO流来进行网络通信。
2.TCP发送数据
1、创建客户端的Socket对象(Socket)
Socket(String host,int port);
2、获取输出流,写数据
OutputStream getOutputStream();
3、释放资源
void close();
import java.io.OutputStream; import java.net.Socket; public class SendDemo {
public static void main(String[] args) throws Exception { //创建客户端的Socket对象
//Socket(InetAddress address,int port) // Socket s = new
Socket(InetAddress.getByName("192.168.199.148"),10086); Socket s = new Socket(
"192.168.199.148",10086); //底层会将地址字符串转换成InetAddress对象 //获取输出流 OutputStream os =
s.getOutputStream(); os.write("hellojava".getBytes()); //释放资源 s.close(); } }
3.TCP接收数据
1、创建服务器端的Socket对象(ServerScoket)
ServerSocket(int port);
2、监听客户端连接,返回一个Socket对象
Socket accept();
2、获取输入流,读数据,并把数据显示在控制台
InputStream getInputStream();
3、释放资源
void close();
import java.io.IOException; import java.io.InputStream; import java.net.
ServerSocket; import java.net.Socket; public class ServerDemo { public static
void main(String[] args) throws IOException { //创建服务器端的Socket对象 ServerSocket ss
= new ServerSocket(10086); //监听客户端连接 并返回Socket对象 Socket s = ss.accept(); //获取输入流
InputStream is= s.getInputStream(); byte[] bys = new byte[1024]; //返回读取到的数据的长度
int len = is.read(bys); String data = new String(bys,0,len); System.out.println(
data); //释放资源 ss.close(); } }