我有一个程序，它接受来自发送字节数组的手机的连接，我能够在连接时测试连接，但是我怎么知道我实际上正在接收什么东西？我如何“查看”是否有任何东西通过套接字发送。因为从我下面的代码中，我无法创建结果文件“saved.jpg”。这是否意味着它没有收到任何东西？
public class wpsServer {
//vars
private int svrPort = 3334;
private ServerSocket serverSocket;
private Image image = null;
public wpsServer()
{
try {
serverSocket = new ServerSocket(svrPort);
System.out.println("Server started on "+svrPort);
}
catch (IOException e) {
System.out.println("Could not listen on port: "+svrPort);
System.exit(-1);
}
}
public void listenForClient()
{
Socket clientSocket = null;
try {
clientSocket = serverSocket.accept();
if(clientSocket.isConnected())
System.out.println("Connected");
byte[] pic = getPicture(clientSocket.getInputStream());
InputStream in = new ByteArrayInputStream(pic);
BufferedImage image = ImageIO.read(in);
File outputfile = new File("saved.jpg");
ImageIO.write(image, "jpg", outputfile);
}
catch (IOException e) {
System.out.println("Accept failed: "+svrPort);
System.exit(-1);
}
}
public byte[] getPicture(InputStream in) {
try {
ByteArrayOutputStream out = new ByteArrayOutputStream();
byte[] data = new byte[1024];
int length = 0;
while ((length = in.read(data))!=-1) {
out.write(data,0,length);
}
return out.toByteArray();
} catch(IOException ioe) {
//handle it
}
return null;
}
}