这段代码提供了一个最小化的实现,可以通过IPP将只能提交可打印的文档格式(如PDF)发送到打印机(或CUPS)。
ipp-printjob-java具有基本的解码IPP响应的支持。
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.HttpURLConnection;
import java.net.URI;
import java.nio.charset.Charset;
import java.nio.charset.StandardCharsets;
public class IppPrintJob {
public static void main(String args[]) throws Exception {
URI printerURI = URI.create("http://colorjet:631/ipp/printer");
File file = new File("A4-blank.pdf");
short status = new IppPrintJob()
.printDocument(printerURI, new FileInputStream(file));
System.out.println(String.format("ipp status: %04X", status));
}
short printDocument(
URI uri, InputStream documentInputStream
) throws IOException {
HttpURLConnection httpURLConnection =
(HttpURLConnection) uri.toURL().openConnection();
httpURLConnection.setDoOutput(true);
httpURLConnection.setRequestProperty("Content-Type", "application/ipp");
OutputStream outputStream = httpURLConnection.getOutputStream();
DataOutputStream dataOutputStream =
new DataOutputStream(httpURLConnection.getOutputStream());
dataOutputStream.writeShort(0x0101);
dataOutputStream.writeShort(0x0002);
dataOutputStream.writeInt(0x002A);
dataOutputStream.writeByte(0x01);
writeAttribute(dataOutputStream, 0x47, "attributes-charset", "utf-8");
writeAttribute(dataOutputStream, 0x48, "attributes-natural-language", "en");
writeAttribute(dataOutputStream, 0x45, "printer-uri", uri.toString());
dataOutputStream.writeByte(0x03);
documentInputStream.transferTo(outputStream);
dataOutputStream.close();
outputStream.close();
if (httpURLConnection.getResponseCode() == 200) {
DataInputStream dataInputStream =
new DataInputStream(httpURLConnection.getInputStream());
System.out.println(String.format("ipp version %d.%s",
dataInputStream.readByte(), dataInputStream.readByte()
));
return dataInputStream.readShort();
} else {
throw new IOException(String.format("post to %s failed with http status %d",
uri, httpURLConnection.getResponseCode()
));
}
}
void writeAttribute(
DataOutputStream dataOutputStream, int tag, String name, String value
) throws IOException
{
Charset charset = StandardCharsets.UTF_8;
dataOutputStream.writeByte(tag);
dataOutputStream.writeShort(name.length());
dataOutputStream.write(name.getBytes(charset));
dataOutputStream.writeShort(value.length());
dataOutputStream.write(value.getBytes(charset));
}
}