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java中TCP之TCP实现

代码均来自计算机网络教材

此为服务器端代码

package server;
import java.io.BufferedReader;
import java.io.DataOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.ServerSocket;
import java.net.Socket;
public class TcpServer {
public static void main(String[] args) throws IOException {
    String getString;
    String sendString;
    ServerSocket socket = new ServerSocket(6789);
    //ServerSocket 为服务器监听的类
    while(true) {
        //收到accept请求,返回socket实例
        Socket connection = socket.accept();
        System.out.println("connect successfully");
        //获得输入的内容,即客户端程序发送过来的消息
        BufferedReader reader = new BufferedReader(new InputStreamReader(connection.getInputStream()));
        //发送回去的内容
        DataOutputStream outputStream = new DataOutputStream(connection.getOutputStream());
        getString = reader.readLine();
        sendString = getString.toUpperCase() + "\n";
        //将内容写入到想要返回给客户端的流中
        outputStream.writeBytes(sendString);
    }
}}

client类
package client;

import java.io.BufferedReader;
import java.io.DataOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.Socket;
import java.net.UnknownHostException;
import java.nio.Buffer;
public class TcpClient {
public static void main(String[] args) throws UnknownHostException, IOException {
    // TODO Auto-generated method stub
    String sendString;
    String getString;
    BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(System.in));
    System.out.println("start connection");
    //开始连接,参数为host,如果为本地的话,则为127.0.0.1,端口跟服务器使用端口相同
    Socket socket = new Socket("45.62.102.41", 6789);
    System.out.println("connect successfully");
    //发送的内容
    DataOutputStream outputStream = new DataOutputStream(socket.getOutputStream());
    //接收的内容
    BufferedReader fromServer = new BufferedReader(new InputStreamReader(socket.getInputStream()));
    sendString = bufferedReader.readLine();
    outputStream.writeBytes(sendString + "\n");
    getString = fromServer.readLine();
    System.out.print(getString);
    socket.close();
    }}

可以看到,这个连接是能够确保数据的传输的.在传输数据之前,我们新建了一个虚拟通道(从socket到ServerSocket之间的),并且我们可以通过数据流来进行数据的传输.

java中TCP之TCP实现

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原文地址：http://www.cnblogs.com/wilbertwu/p/4840663.html