用java判断打印机打印服务的能力

import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.OutputStream;

import javax.print.DocFlavor;
import javax.print.StreamPrintService;
import javax.print.StreamPrintServiceFactory;
import javax.print.attribute.Attribute;

public class Main {
public static void main(String[] argv) throws Exception {
OutputStream fos = new BufferedOutputStream(new FileOutputStream("filename.ps"));
DocFlavor flavor = DocFlavor.INPUT_STREAM.GIF;
StreamPrintServiceFactory[] factories = StreamPrintServiceFactory
.lookupStreamPrintServiceFactories(flavor, DocFlavor.BYTE_ARRAY.POSTSCRIPT.getMimeType());

StreamPrintService service = factories[0].getPrintService(fos);
Attribute[] attrs = service.getAttributes().toArray();
for (int j = 0; j < attrs.length; j++) {
String attrName = attrs[j].getName();
String attrValue = attrs[j].toString();
System.out.println(attrName);
System.out.println(attrValue);
}
}
}