java socket 通信 connection reset问题

[QQ5185149]

客户端（java）读取服务器端(C++)的数据，只能读取服务器端一次写入到流中的数据，在read就抛java.net.SocketException: Connection reset的错误，已经折磨我很长时间了，本人对C++不太了解，而且C++开发的客户端是正常的，所以我觉得我的代码肯定有问题，希望高人指点
客户端代码：
Socket socket = null;
PrintWriter out = null;
BufferedReader in = null;
String result = "";
try {
socket = new Socket(SocketConfig.SERVER_IP, SocketConfig.SERVER_PORT);
socket.setSoTimeout(10000);
in = new BufferedReader(new InputStreamReader(socket.getInputStream(), SocketConfig.CHAR_ENCODING));

out = new PrintWriter(new OutputStreamWriter(socket.getOutputStream(), SocketConfig.CHAR_ENCODING), true);


String cmd = SocketClient.genCmd(command);
System.out.println("command:::" + cmd);
out.println(cmd);
out.flush();

char[] head_char = new char[18];
in.read(head_char);
String head = new String(head_char);

//输出到控制台
System.out.print("resHead:::");
System.out.println(head);

char state = head.charAt(0);// 结果状态
char encryptType = head.charAt(1);//加密方式
int rows = Integer.parseInt(head.substring(2, 6));// 结果行数
int cols = Integer.parseInt(head.substring(6, 10));// 每行字段数
long byteCounts = Long.parseLong(head.substring(10, 18));// 结果字节数
String resultBuf = "";// 结果内容

//逐行读取结果内容
for(int i = 0; i < rows; i++){
String oneRow = in.readLine();
System.out.println(oneRow);
}

} catch (Exception e) {
e.printStackTrace();
throw new Exception(e);

} finally {
try {
if (null != out)
out.close();
if (null != in)
in.close();
if (null != socket)
socket.close();
} catch (Exception e) {
e.printStackTrace();
}
}

错误信息：
java.net.SocketException: Connection reset
at java.net.SocketInputStream.read(SocketInputStream.java:168)
at sun.nio.cs.StreamDecoder$CharsetSD.readBytes(StreamDecoder.java:411)
at sun.nio.cs.StreamDecoder$CharsetSD.implRead(StreamDecoder.java:453)
at sun.nio.cs.StreamDecoder.read(StreamDecoder.java:183)
at java.io.InputStreamReader.read(InputStreamReader.java:167)
at java.io.BufferedReader.fill(BufferedReader.java:136)
at java.io.BufferedReader.read(BufferedReader.java:157)
at com.rails.smm.cmd.SocketClient.execCmd(SocketClient.java:87)
at com.rails.smm.cmd.SocketClient.main(SocketClient.java:163)