Printing using SpringBoot - cups4j

One of the easiest ways to print something from Java, in this case, using a SpringBoot Java Api Rest is with CUPS.

Let's assume you've set up your CUPS server up and running,

add to your pom.xml file this dependency

    <dependency>

    <groupId>org.cups4j</groupId>

    <artifactId>cups4j</artifactId>

    <version>0.7.6</version>

</dependency>

now at this imports to

import java.io.FileInputStream;

import java.io.FileNotFoundException;

import java.net.URL;

import java.util.HashMap;

import java.util.List;

import org.cups4j.CupsClient;

import org.cups4j.CupsPrinter;

import org.cups4j.PrintJob;

import org.cups4j.PrintJobAttributes;

import org.cups4j.PrintRequestResult;

import org.cups4j.WhichJobsEnum;

add this method to print using CUPS

private static void print(String host, String printerName, String fileName, 

int copies, String pages, boolean duplex, String attributes) throws Exception {

    FileInputStream fileInputStream = new FileInputStream(fileName);

    CupsPrinter printer = null;

    CupsClient cupsClient = new CupsClient(host, CupsClient.DEFAULT_PORT);

    if (printerName == null) {

      printer = cupsClient.getDefaultPrinter();

    } else {

      printer = new CupsPrinter(new URL("http://" + host + ":" +

CupsClient.DEFAULT_PORT + "/printers/" + printerName),

          printerName, false);

    }

    HashMap<String, String> attributeMap = new HashMap<String, String>();

    if (attributes != null) {

      attributeMap.put("job-attributes", attributes.replace("+", "#"));

    }

    PrintJob printJob = new PrintJob.Builder(fileInputStream)

.jobName("testJobName").userName("harald").copies(copies)

        .pageRanges(pages).duplex(duplex).attributes(attributeMap).build();

    PrintRequestResult printRequestResult = printer.print(printJob);

    if (printRequestResult.isSuccessfulResult()) {

      int jobID = printRequestResult.getJobId();

      System.out.println("file sent to " + printer.getPrinterURL() + 

" jobID: " + jobID);

      System.out.println("... current status = " + printer.getJobStatus(jobID));

      Thread.sleep(1000);

      System.out.println("... status after 1 sec. = " + printer.getJobStatus(jobID));

      System.out.println("Get last Printjob");

      PrintJobAttributes job = cupsClient.getJobAttributes(host, jobID);

      System.out.println("ID: " + job.getJobID() + " user: " + 

job.getUserName() + " url: " + job.getJobURL()

          + " status: " + job.getJobState());

    } else {

      // you might throw an exception or try to retry printing the job

      throw new Exception("print error! status code: " + 

printRequestResult.getResultCode() + " status description: "

          + printRequestResult.getResultDescription());

    }

now wherever you are to use it

 try {

      print("192.168.70.45", "juandavid", "D://zm.txt", 1, "1", false, "");

    } catch (Exception e) {

      // TODO Auto-generated catch block

      e.printStackTrace();

    }

in that way I am giving it the hostname or IP address, the printer name as it was given on the CUPS server, and the path of the file I want to print.

to have a better understanding get it from

https://github.com/harwey/cups4j/blob/master/src/main/java/org/cups4j/client/Cups.java

https://github.com/harwey/cups4j

https://github.com/juandavidmarin368/Printing-With-SpringBoot-Cups

How to set up CUPS on Linux Centos

1-

yum install cups

2-

yum install ghostscript.x86_64 hplip-common.x86_64

3- start the service and let it run automatically each time the server gets restarted

service cups start
chkconfig cups on

to manage CUPs via web

vim /etc/cups/cupsd.conf

Allowing what IPS are going to get connected to the server

Allowing the sub local network having access to the GUI

Allowing the IP which will have access as admin, by default it is the same username and root password when it is tried to be accessed via web 

save changes now and restart with service cups restart

browse to https://serverip:631

let's create a new printer inside the GUI

let's click on Add Printer 

and after that lpd://192.168.70.46/epsonlx_300

Let's click on continue

on that way you've got your printer ready to be used with CUPS, and do not forget SeLINUX