socket系列（一）——socket实现推送

Javasocket实现推送

实现

设想：用socket实现服务器与客户端的tcp长连接，保持outputStream、InputStream连接，通过输入输出流实现信息实时推送

代码

public classTestPush {       @SuppressWarnings("resource")    @Test    public void pushService() throws IOException {       ServerSocketserviceSocket= newServerSocket(10888);       while(true) {           Socketsocket= serviceSocket.accept();           InputStreamclientMsgIs= socket.getInputStream();           StringclientMsg= StreamUtil.inputStreamToString(clientMsgIs, "UTF-8");           System.out.println(clientMsg);           socket.shutdownInput();                     System.out.println("请输入推送信息：");           Scannersc = new Scanner(System.in);           StringpushMsg= sc.nextLine();                     OutputStreamserviceOs= socket.getOutputStream();           BufferedWriterwriter= newBufferedWriter(newOutputStreamWriter(serviceOs));           while(!"end".equals(pushMsg)) {              writer.write(pushMsg);              writer.newLine();              writer.flush();              System.out.println("请输入推送信息：");              sc = new Scanner(System.in);              pushMsg = sc.nextLine();           }           socket.shutdownOutput();           serviceOs.close();           socket.close();       }    }       @SuppressWarnings("resource")    @Test    public void pushClient() throws UnknownHostException,IOException {       Socketsocket= newSocket("127.0.0.1", 10888);             OutputStreamos = socket.getOutputStream();       Stringcmsg= "client connect success";       os.write(cmsg.getBytes("UTF-8"));       os.flush();                 //这是socket强制发送       socket.shutdownOutput();             InputStreamserviceMsgIs= socket.getInputStream();       BufferedReaderreader= newBufferedReader(newInputStreamReader(serviceMsgIs));       Stringcontent= null;       while(true) {           if((content = reader.readLine()) != null) {               System.out.println(content);            }       }    }  }

运行

用junit将两个方法运行一下，效果如下

总结

这只是一个了解原理的demo，有很都多不完善的地方。

注意的是这里只能使用readline()和write.newLine()的原因是客户端InputStream接收到含有换行符的时候，就会把inputStream缓存的数据拿出来，而如果直接使用InputStream.read()话，它只会在连接结束后才把缓存的数据读取出来。