เขียน java เพื่อสร้าง QRCode

maven project

1. dependencies at pom.xml

...
...
...
    <dependencies>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>3.8.1</version>
            <scope>test</scope>
        </dependency>

        <dependency>
            <groupId>com.google.guava</groupId>
            <artifactId>guava</artifactId>
            <version>13.0.1</version>
            <type>jar</type>
        </dependency>
        
        <dependency>
            <groupId>net.glxn</groupId>
            <artifactId>qrgen</artifactId>
            <version>1.1</version>
        </dependency>
    </dependencies>
    
    <repositories>
        <repository>
            <id>QRGen</id>
            <name>QRGen Repo</name>
            <url>http://kenglxn.github.com/QRGen/repository</url>
        </repository>
    </repositories>
...
...
...

2. write code

package com.blogspot.na5cent.learning.qrcode;

import com.google.common.io.Files;
import com.google.common.io.InputSupplier;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.util.logging.Level;
import java.util.logging.Logger;
import net.glxn.qrgen.QRCode; //****

/**
 * @author redcrow
 *
 */
public class Main {

    private static final Logger LOG = Logger.getLogger(Main.class.getName());
    private static final File parent = new File("D:\\learning\\java\\QRCode\\");

    static {
        if (!parent.exists()) {
            parent.mkdirs();
        }
    }

    public static void main(String[] args) {
        String clearText = "com.blogspot.na5cent";
        String outputFileName = "QRCode.png";         

        InputStream inputStream = null;
        try {
            File file = QRCode.from(clearText).file(); //*****

            inputStream = new FileInputStream(file);
            copyFile(parent, outputFileName, inputStream);
        } catch (FileNotFoundException ex) {
            LOG.log(Level.SEVERE, null, ex);
        } catch (IOException ex) {
            LOG.log(Level.SEVERE, null, ex);
        } finally {
            if (inputStream != null) {
                try {
                    inputStream.close();
                } catch (IOException ex) {
                    LOG.log(Level.SEVERE, null, ex);
                }
            }
        }
    }

    private static void copyFile(File pathfile, String fileName, final InputStream inputStream) throws IOException {
        Files.copy(new InputSupplier<InputStream>() {
            @Override
            public InputStream getInput() throws IOException {
                return inputStream;
            }
        }, new File(pathfile, fileName));
    }
}