demo实现的简单功能是，接受PHP端写入的字符串，然后原样返回给输出端。代码如下：

复制代码 代码如下:

import java.io.*;

import java.net.*;

public class Server {

public static void main(String[] args) throws IOException{

System.out.println("Server started !n");

ServerSocket server=new ServerSocket(5678);

while (true){

Socket client=server.accept();

System.out.println("client coming!n");

PrintWriter printer = new PrintWriter(client.getOutputStream());

BufferedReader reader = new BufferedReader(new InputStreamReader(client.getInputStream()));

String m = reader.readLine();

System.out.println("get infomation " + m + "n from " + client.getInetAddress().toString());

printer.println(m);

printer.flush();

printer.close();

printer.close();

client.close();

System.out.println("client leaving!n");

}

}

}

运行起来，以后该java程序将监听5678端口，当接收到消息以后，将接收的消息原样返回给客户端……

PHP的代码如下：

复制代码 代码如下:

<?php

$socket = socket_create ( AF_INET, SOCK_STREAM, SOL_TCP ) or die ( 'could not create socket' );

$connect = socket_connect ( $socket, '127.0.0.1', 5678 );

//向服务端发送数据

socket_write ( $socket, 'Hello' . "n" );

//接受服务端返回数据

$str = socket_read ( $socket, 1024, PHP_NORMAL_READ );

echo $str;

//关闭

socket_close($socket);

PHP程序连接本机的5678端口，写入 Hello，然后读取返回的数据……将返回的数据，输出到浏览器……

先运行起java的服务端，然后用浏览器访问PHP页面，将看到从服务器端返回的Hello