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package net.viralpatel.qrcode;

import java.io.ByteArrayOutputStream;

import java.io.File;

import java.io.FileNotFoundException;

import java.io.FileOutputStream;

import java.io.IOException;

import net.glxn.qrgen.QRCode;

import net.glxn.qrgen.image.ImageType;

public class Main {

    public static void main(String[] args) {

        ByteArrayOutputStream out = QRCode.from("Hello World").to(ImageType.PNG).stream();

        try {

            FileOutputStream fout = new FileOutputStream(new File(

                    "C:QR_Code.JPG"));

            fout.write(out.toByteArray());

            fout.flush();

            fout.close();

        } catch (FileNotFoundException e) {

            // Do Logging

        } catch (IOException e) {

            // Do Logging

        }

    }

}

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// get QR file from text using defaults

File file = QRCode.from("Hello World").file();

// get QR stream from text using defaults

ByteArrayOutputStream stream = QRCode.from("Hello World").stream();

// override the image type to be JPG

QRCode.from("Hello World").to(ImageType.JPG).file();

QRCode.from("Hello World").to(ImageType.JPG).stream();

// override image size to be 250x250

QRCode.from("Hello World").withSize(250, 250).file();

QRCode.from("Hello World").withSize(250, 250).stream();

// override size and image type

QRCode.from("Hello World").to(ImageType.GIF).withSize(250, 250).file();

QRCode.from("Hello World").to(ImageType.GIF).withSize(250, 250).stream();

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ByteArrayOutputStream out = QRCode.from("http://viralpatel.net").to(ImageType.PNG).stream();

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<form action="qrservlet" method="get">

 <p>Enter Text to create QR Codep>

 <input name="qrtext" type="text">

 <input value="Generate QR Code" type="submit">

form>

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package net.viralpatel.qrcodes;

import java.io.ByteArrayOutputStream;

import java.io.File;

import java.io.FileNotFoundException;

import java.io.FileOutputStream;

import java.io.IOException;

import java.io.OutputStream;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import net.glxn.qrgen.QRCode;

import net.glxn.qrgen.image.ImageType;

public class QRCodeServlet extends HttpServlet {

    @Override

    protected void doGet(HttpServletRequest request,

        HttpServletResponse response) throws ServletException, IOException {

        String qrtext = request.getParameter("qrtext");

        ByteArrayOutputStream out = QRCode.from(qrtext).to(ImageType.PNG).stream();

        response.setContentType("image/png");

        response.setContentLength(out.size());

        OutputStream outStream = response.getOutputStream();

        outStream.write(out.toByteArray());

        outStream.flush();

        outStream.close();

    }

}

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<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xsi:schemalocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="WebApp_ID" version="2.5">

    <display-name>QR_Code_Servletdisplay-name>

    <welcome-file-list>

        <welcome-file>index.jspwelcome-file>

    welcome-file-list>

    <servlet>

        <servlet-name>QRCodeServletservlet-name>

        <servlet-class>net.viralpatel.qrcodes.QRCodeServletservlet-class>

    servlet>

    <servlet-mapping>

        <servlet-name>QRCodeServletservlet-name>

        <url-pattern>/qrservleturl-pattern>

    servlet-mapping>

web-app>