java.net.SocketException: Connection reset将老师的代码下载后，自己运行，发现还是会有这个问题，老师求解答啊

java.net.SocketException: Connection reset
 at java.net.SocketInputStream.read(SocketInputStream.java:209)
 at java.net.SocketInputStream.read(SocketInputStream.java:141)
 at sun.nio.cs.StreamDecoder.readBytes(StreamDecoder.java:284)
 at sun.nio.cs.StreamDecoder.implRead(StreamDecoder.java:326)
 at sun.nio.cs.StreamDecoder.read(StreamDecoder.java:178)
 at java.io.InputStreamReader.read(InputStreamReader.java:184)
 at java.io.BufferedReader.fill(BufferedReader.java:161)
 at java.io.BufferedReader.readLine(BufferedReader.java:324)
 at java.io.BufferedReader.readLine(BufferedReader.java:389)
 at com.imooc.Client.main(Client.java:30)