how to use java code to print with a network printer

1/**
2 * Retrieve the specified Print Service; will return null if not found.
3 * @return
4 */
5public static PrintService findPrintService(String printerName) {
6
7    PrintService service = null;
8    
9    // Get array of all print services - sort order NOT GUARANTEED!
10    PrintService[] services = PrinterJob.lookupPrintServices();
11    
12    // Retrieve specified print service from the array
13    for (int index = 0; service == null && index < services.length; index++) {
14        
15        if (services[index].getName().equalsIgnoreCase(printerName)) {
16
17            service = services[index];
18        }
19    }
20
21    // Return the print service
22    return service;
23}
24
25/**
26 * Retrieve a PrinterJob instance set with the PrinterService using the printerName.
27 * 
28 * @return
29 * @throws Exception IllegalStateException if expected printer is not found.
30 */
31public static PrinterJob findPrinterJob(String printerName) throws Exception {
32
33    // Retrieve the Printer Service
34    PrintService printService = PrintUtility.findPrintService(printerName);
35
36    // Validate the Printer Service
37    if (printService == null) {
38
39        throw new IllegalStateException("Unrecognized Printer Service \"" + printerName + '"');
40    }
41    
42    // Obtain a Printer Job instance.
43    PrinterJob printerJob = PrinterJob.getPrinterJob();
44    
45    // Set the Print Service.
46    printerJob.setPrintService(printService);
47
48    // Return Print Job
49    return printerJob;
50}
51
52/**
53 * Printer list does not necessarily refresh if you change the list of 
54 * printers within the O/S; you can run this to refresh if necessary.
55 */
56public static void refreshSystemPrinterList() {
57
58    Class[] classes = PrintServiceLookup.class.getDeclaredClasses();
59
60    for (int i = 0; i < classes.length; i++) {
61
62        if ("javax.print.PrintServiceLookup$Services".equals(classes[i].getName())) {
63
64            sun.awt.AppContext.getAppContext().remove(classes[i]);
65            break;
66        }
67    }
68}
69