通过Java中的socket发送打印机命令 [英] Send printer commands via socket in Java
问题描述
我正在尝试通过套接字向卡片打印机发送命令,但我无法使其正常工作。现在,我有一个用PHP开发的程序,它正在运行,但我需要让它在Java中运行。 PHP中的程序是这样的:
i'm trying to send commands to a card printer via socket, but i am unable to make it work. Right now, i have a program developed in php, that is working, but i need to make it work in Java. The program in PHP is something like this:
$ESC = chr(27); //Ascii character for Escape
$CR = chr(13); // Ascii character for Carriage Return
$cmd = $ESC . $command . $CR;
socket_send($socket, $cmd, strlen($cmd), 0);
socket_recv($socket, $respuesta, strlen($respuesta), 0);
在Java中,我正在做这样的事情
In Java, i am making something like this
char ESC = (char)27; //Ascii character for Escape
char CR = (char) 13; //Ascii character for Carriage Return
//////////////
Socket socket = null;
DataInputStream input = null;
DataOutputStream output = null;
// I make another stuff here
socket = new Socket(address,port);
input = new DataInputStream (socket.getInputStream());
output = new DataOutputStream (socket.getOutputStream());
//I make another stuff here
if (socket != null && input != null && output != null)
{
try
{
String cmd=ESC+command+CR;
byte[] message = cmd.getBytes();
output.writeShort(cmd.length());
output.writeBytes(cmd);
message = new byte[input.readShort()];
input.readFully(message);
response = new String(message);
salida.close();
entrada.close();
conec.close();
}
catch (Exception e)
{
System.out.println(e.toString());
}
}
我试过不同类型的数据:int,UTF-8,long等,但似乎不起作用。我不知道打印机是否需要更多信息,或者我发送错误类型的数据
I tried with different type of data: int, UTF-8, long, etc, but doesn't seem to work. I don't know if the printer is expecting more information, or i am sending the wrong type of data
让我总结一下:PHP中的代码运行良好,但是当我试图将该代码转换为Java,并通过套接字将命令发送到打印机,但根本不工作。我已经阅读了手册,但根本没有帮助
Let me summarize: the code in PHP is working great, but when i am trying to translate that code to Java, and send the commands to the printer via socket, but isn't working at all. I already read the manual, but doesn't help at all
P.D。打印机的品牌是Evolis
P.D. The brand of the printer is Evolis
P.D。 2对不起,如果我的解释不是很好,但英语不是我的第一语言
P.D. 2 Sorry if i am not explained very well, but english isn't my first language
提前致谢
推荐答案
我终于找到了解决方案。让我与你分享
I finally found a solution. Let me share it with you
char ESC = (char)27; //Ascii character for ESCAPE
char CR = (char) 13; //Ascii character for Carriage Return
/////////////
Socket socket = null;
OutputStream output= null;
BufferedReader reader= null;
///////////
try
{
socket = new Socket(address,port);
socket.setSoTimeout(5000);
output = socket.getOutputStream();
reader = new BufferedReader(new InputStreamReader(socket.getInputStream()));
}
catch (UnknownHostException e) {etc... }
/////////
if (socket != null && output != null)
{
try
{
String cmd=ESC+command+CR;
output.write(cmd.getBytes());
output.flush();
socket.shutdownOutput();
response = reader.readLine();
System.out.println(response.toString());
output.close();
socket.close();
}
catch (Exception e)
{
System.out.println(e.toString());
}
}
此解决方案的关键是方法 socket.shutdownOutput(); ,因为我认为设备无法同时发送和接收数据,因此如果您想要设备的响应,则必须先关闭输出(手册根本没有帮助,所以我现在正在猜测。)
The key in this solution was the method socket.shutdownOutput();, because i think that the device is unable to send and receive data at the same time, so if you want a response from the device, you must close the output first (the manual doesn't help at all, so i am guessing right now)
感谢大家的帮助
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