I decided to write a barcode generator in Java “for no apparent reason”, that can currently generator EAN13 barcodes. It’s available here in this post, but if you want the latest code then I suggest you check it out on github.
Github repo:
https://github.com/jra89/barcode
Usage:
java -jar barcode.jar numbers path barwidth barheight
Example:
java -jar barcode.jar 999990000020 /home/user/Desktop/EAN_IMG.png 2 60
Main.java
package barcode;
public class Main
{
public static void main(String[] args)
{
String code;
String path;
int barWidth;
int barHeight;
if(args.length <= 1)
{
System.out.println("Not enough parameters");
}
try
{
code = args[0];
}
catch(NullPointerException e)
{
code = "9999900000207";
}
try
{
path = args[1];
}
catch(NullPointerException e)
{
path = "/tmp/barcode.png";
}
try
{
barWidth = Integer.parseInt(args[2]);
}
catch(NullPointerException e)
{
barWidth = 1;
}
try
{
barHeight = Integer.parseInt(args[3]);
}
catch(NullPointerException e)
{
barHeight = 100;
}
Ean13 ean = new Ean13(code, path, barWidth, barHeight);
ean.createBarcodePNG();
}
}
Ean13.java
package barcode;
import java.awt.BasicStroke;
import java.awt.Color;
import java.awt.Graphics2D;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import javax.imageio.ImageIO;
public class Ean13
{
/**
* -=Structure=-
*
* Fist, First Six, Last Six
* LGR = 012
* 0 LLLLLL RRRRRR
* 1 LLGLGG RRRRRR
* 2 LLGGLG RRRRRR
* 3 LLGGGL RRRRRR
* 4 LGLLGG RRRRRR
* 5 LGGLLG RRRRRR
* 6 LGGGLL RRRRRR
* 7 LGLGLG RRRRRR
* 8 LGLGGL RRRRRR
* 9 LGGLGL RRRRRR
*
* -=Encodings=-
*
* Digit L-code G-code R-code
* 0 0001101 0100111 1110010
* 1 0011001 0110011 1100110
* 2 0010011 0011011 1101100
* 3 0111101 0100001 1000010
* 4 0100011 0011101 1011100
* 5 0110001 0111001 1001110
* 6 0101111 0000101 1010000
* 7 0111011 0010001 1000100
* 8 0110111 0001001 1001000
* 9 0001011 0010111 1110100
**/
private String code;
private String path;
private BufferedImage bi;
private Graphics2D ig2;
private int barPos;
private int barPosBin;
private int imgPixelPos;
private int barWidth;
private int barHeight;
private int imgWidth;
private int imgHeight;
private int[][] barcodeBinary;
private int[][] firstSix = {
{0,0,0,0,0,0}, //LLLLLL
{0,0,1,0,1,1}, //LLGLGG
{0,0,1,1,0,1}, //LLGGLG
{0,0,1,1,1,0}, //LLGGGL
{0,1,0,0,1,1}, //LGLLGG
{0,1,1,0,0,1}, //LGGLLG
{0,1,1,1,0,0}, //LGGGLL
{0,1,0,1,0,1}, //LGLGLG
{0,1,0,1,1,0}, //LGLGGL
{0,1,1,0,1,0} //LGGLGL
};
private int[] lastSix = {2, 2, 2, 2, 2, 2};
private int[][][] encodings = {
{
{0,0,0,1,1,0,1},
{0,1,0,0,1,1,1},
{1,1,1,0,0,1,0}
},
{
{0,0,1,1,0,0,1},
{0,1,1,0,0,1,1},
{1,1,0,0,1,1,0}
},
{
{0,0,1,0,0,1,1},
{0,0,1,1,0,1,1},
{1,1,0,1,1,0,0}
},
{
{0,1,1,1,1,0,1},
{0,1,0,0,0,0,1},
{1,0,0,0,0,1,0}
},
{
{0,1,0,0,0,1,1},
{0,0,1,1,1,0,1},
{1,0,1,1,1,0,0}
},
{
{0,1,1,0,0,0,1},
{0,1,1,1,0,0,1},
{1,0,0,1,1,1,0}
},
{
{0,1,0,1,1,1,1},
{0,0,0,0,1,0,1},
{1,0,1,0,0,0,0}
},
{
{0,1,1,1,0,1,1},
{0,0,1,0,0,0,1},
{1,0,0,0,1,0,0}
},
{
{0,1,1,0,1,1,1},
{0,0,0,1,0,0,1},
{1,0,0,1,0,0,0}
},
{
{0,0,0,1,0,1,1},
{0,0,1,0,1,1,1},
{1,1,1,0,1,0,0}
}
};
Ean13(String code, String path,int barWidth, int barHeight)
{
this.code = code;
this.path = path;
this.barPos = 12;
this.barPosBin = 7;
this.imgPixelPos = 0;
this.barcodeBinary = new int[barPos][barPosBin];
this.barWidth = barWidth;
this.barHeight = barHeight;
this.imgWidth = ((12*7) + (2*9) + (2*3) + (1*5)) * this.barWidth;
this.imgHeight = this.barHeight;
}
public void createBarcodePNG()
{
this.code += Integer.toString(calculateControlDigit(this.code));
generateBinaryMap();
generateBarcodePNG();
}
private void generateBinaryMap()
{
int first = Integer.parseInt(String.valueOf(this.code.charAt(0)));
//i = 1, first digit is not welcome to the bar
for(int i = 1; i < 13; ++i)
{
int current = Integer.parseInt(String.valueOf(this.code.charAt(i)));
if(i < 7)
this.barcodeBinary[i-1] = this.encodings[current][this.firstSix[first][i-1]];
else
this.barcodeBinary[i-1] = this.encodings[current][this.lastSix[i-7]];
}
}
private void generateBarcodePNG()
{
try {
// TYPE_INT_ARGB specifies the image format: 8-bit RGBA packed
// into integer pixels
bi = new BufferedImage(this.imgWidth, this.imgHeight, BufferedImage.TYPE_INT_ARGB);
ig2 = bi.createGraphics();
ig2.setPaint(Color.white);
ig2.fillRect ( 0, 0, bi.getWidth(), bi.getHeight() );
//Draw quiet zone
drawSpecial(0);
//Draw lead
drawSpecial(1);
//Draw first group
drawGroup(1);
//Draw separator
drawSpecial(2);
//Draw second group
drawGroup(2);
//Draw lead
drawSpecial(1);
//Draw quiet zone
drawSpecial(0);
ImageIO.write(bi, "PNG", new File(path));
} catch (IOException ie) {
ie.printStackTrace();
}
}
private void drawGroup(int groupPart)
{
int i = 0, length = 0;
if(groupPart == 1)
{
i = 0;
length = (this.barcodeBinary.length/2);
}
else if(groupPart == 2)
{
i = 6;
length = this.barcodeBinary.length;
}
for(; i < length; ++i)
{
for(int n = 0; n < this.barcodeBinary[i].length; ++n)
{
if(this.barcodeBinary[i][n] == 0)
{
ig2.setPaint(Color.white);
ig2.setStroke(new BasicStroke(this.barWidth));
}
else
{
ig2.setPaint(Color.black);
ig2.setStroke(new BasicStroke(this.barWidth));
}
int pos = this.imgPixelPos;
ig2.drawLine(pos,0,pos,this.barHeight);
this.imgPixelPos += this.barWidth;
}
}
}
private void drawSpecial(int type)
{
/*
Special Symbol Pattern
Quite Zone 000000000
Lead / Trailer 101
Separator 01010
*/
int[] quiteZone = {0,0,0,0,0,0,0,0,0};
int[] leadtrail = {1,0,1};
int[] separator = {0,1,0,1,0};
int binaryArrLength = 0;
int[] arr;
if(type == 0)
{
binaryArrLength = quiteZone.length;
arr = quiteZone;
}
else if(type == 1)
{
binaryArrLength = leadtrail.length;
arr = leadtrail;
}
else
{
binaryArrLength = separator.length;
arr = separator;
}
for(int n = 0; n < binaryArrLength; ++n)
{
if(arr[n] == 0)
ig2.setPaint(Color.white);
else
ig2.setPaint(Color.black);
int pos = this.imgPixelPos;
ig2.drawLine(pos,0,pos,this.barHeight);
this.imgPixelPos += this.barWidth;
}
}
public int calculateControlDigit(String ean)
{
int sum = 0;
for(int i = 0; i < 12; ++i)
{
int val = charToInt(ean.charAt(i));
if((i+1)%2 == 0)
sum += val*3;
else
sum += val*1;
}
return (10 - (sum % 10));
}
private int charToInt(char c)
{
return Integer.parseInt(String.valueOf(c));
}
}
