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：
1 import java.io.*; 2 import java.net.*; 3 4 public class Server { 5 public static void main(String[] args) throws IOException{ 6 System.out.println("Server started !\n"); 7 ServerSocket server= new ServerSocket(5678); 8 while ( true){ 9 Socket client=server.accept(); 10 System.out.println("client coming!\n"); 11 PrintWriter printer = new PrintWriter(client.getOutputStream()); 12 BufferedReader reader = new BufferedReader( new InputStreamReader(client.getInputStream())); 13 String m = reader.readLine(); 14 System.out.println("get infomation " + m + "\n from " + client.getInetAddress().toString()); 15 printer.println(m); 16 printer.flush(); 17 printer.close(); 18 printer.close(); 19 client.close(); 20 System.out.println("client leaving!\n"); 21 } 22 }
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：
1 <?php 2 $socket = socket_create ( AF_INET, SOCK_STREAM, SOL_TCP ) or die ( 'could not create socket' ); 3 $connect = socket_connect ( $socket, '127.0.0.1', 5678 ); 4 // 向服务端发送数据 5 socket_write ( $socket, 'Hello' . "\n" ); 6 // 接受服务端返回数据 7 $str = socket_read ( $socket, 1024, PHP_NORMAL_READ ); 8 9 echo $str; 10 // 关闭 11 socket_close( $socket); 12 ?>
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……
原文来自：
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