socket应用示例

在使用中，都用约定使用数据的传输格式等等。见代码
Socket socket = new Socket();//new a socket client
SocketAddress host = new InetSocketAddress(InetAddress.getLocalHost(),5678);

socket.connect(host);//to connect the host
socket.setSoTimeout(60000);//设置成60秒
PrintWriter out=new PrintWriter(socket.getOutputStream());//获得输出流，写入请求信息
out.print(functionCode+len+cardInfo+');
out.flush();//一定要有
BufferedReader in = new BufferedReader(new InputStreamReader(socket.getInputStream()));//获得服务器返回信息
char[] returnCode = new char[3];//返回代码
char[] returnLen = new char[6];//返回包的长度
StringBuffer sb = new StringBuffer();
in.read(returnCode,0,3);//读取返回码
sb.append(returnCode);
sb.setLength(0);//情况sb中原来的数据
in.read(returnLen,0,6);//读取包长度信息
sb.append(returnLen);
out.close();
in.close();
socket.close();

以上，主要涉及到写发送请求的信息，读取返回信息，也用到了StringBuffer，可以设置其长度为0，就可以重新使用了。

上面是客户端代码，下面是服务器端代码，省去了socket连接。

BufferedReader in=new BufferedReader(new InputStreamReader(client.getInputStream()));
//功能号
char[] functionCode = new char[3];
//包长度
char[] returnLen = new char[6];
StringBuffer sb = new StringBuffer();
//取出功能号
in.read(functionCode,0,3);
String funtion = sb.append(functionCode).toString();
sb.setLength(0);
System.out.println("功能号："+funtion);
in.read(returnLen,0,6);
int baglength = Integer.parseInt(sb.append(returnLen).toString());
sb.setLength(0);
System.out.println("包长度："+baglength);
char[] message = new char[baglength];
in.read(message);
System.out.println(message);
//sleep(10000);

PrintWriter out=new PrintWriter(client.getOutputStream());
out.print("100"+');
out.flush();
in.close();
out.close();

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转载于:http://blog.itpub.net/7659204/viewspace-897399/