Java套接字服务器
我有一个Java进程,使用java.io.ServerSocket在TCP套接字上创建侦听器,类似于以下内容(简化):
ServerSocket server = new ServerSocket(4444,20);
server.accept();
当Java进程接收到请求时,它会启动一个工作线程,然后该工作线程使用java.io.PrintWriter和java.net.Socket发送JSON字符串:
PrintWriter out = new PrintWriter(clientSocket.getOutputStream());
out.println("JSON STRING");
out.flush();
out.close();
clientSocket.close();
我已经简化了Java代码,但它本质上就是这样做的。
.NET Socket客户端
接下来,我有一个.NET应用程序,它与托管此Java进程的计算机通信:
//Create Connection
Socket clientSocket = new Socket(AddressFamily.InterNetwork,
StreamType.Stream, ProtocolType.Tcp);
mySocket.Connect("192.168.1.102", 4444);
//Initialize Byte Buffer Larger than Expected JSON String and Read Bytes
byte[] receivedData = new byte[524288];
int numberOfBytes = clientSocket.Receive(receivedData, SocketFlags.None);
clientSocket.Close();
//Populate a new byte array of the exact size received with the received data
byte[] formatedBytes = new byte[numberOfBytes];
for (int i=0; i< numberOfBytes; i++)
{
formatedBytes[i] = receivedData[i];
}
//Convert Byte Array to String & Output Results
Response.ClearContent();
Response.ContentType("text/plain");
Response.Write(new System.Text.ASCIIEncoding().GetString(receivedData));
我的问题是,无论出于什么原因,在尝试通过Socket Stream发送稍大的JSON字符串时,此实现都无法正常工作。 对于小数据量(小于2KB),我已经成功地测试了超过100个客户端连接并接收数据而没有任何问题,但是尝试将JSON字符串大小增加到约256KB会导致.NET应用程序截断结果。 增加字节缓冲区数组的大小也没有帮助 - 看起来好像.NET应用程序在传输所有数据之前就断开了连接,或者Java应用程序未使用PrintWriter发送整个字符串。
非常感谢任何对此问题的见解 - 如果我自己取得进展,我会发布任何更新。
这是我得出的解决方案 - 服务器现在运行良好! 再次感谢!
byte[] receivedData = new byte[512000]; // 4 Meg Buffer
Socket mySocket = new Socket(AddressFamily.InterNetwork,
SocketType.Stream, ProtocolType.Tcp);
mySocket.Connect("172.26.190.205", 4444);
mySocket.ReceiveBufferSize = 8192;
int numberOfBytesRead = 0;
int totalNumberOfBytes = 0;
do
{
numberOfBytesRead = mySocket.Receive(receivedData,totalNumberOfBytes ,
mySocket.ReceiveBufferSize,SocketFlags.None);
totalNumberOfBytes += numberOfBytesRead;
}
while (numberOfBytesRead > 0);
mySocket.Close();
byte[] formatedBytes = new byte[totalNumberOfBytes ];
for (int i = 0; i < totalNumberOfBytes ; i++)
{
formatedBytes[i] = receivedData[i];
}
Response.ClearContent();
Response.ContentType = "text/plain";
Response.Write(new System.Text.ASCIIEncoding().GetString(formatedBytes));