java zxing条形码去掉两边空白，密度调整，固定条形码宽度

项目背景：由于条形码code不固定，生成的条形码密度，宽度不一致，有些条码密度太紧凑，导致扫码，扫不出来。

解决方法：重写zxing源码方法，看源码可以找到leftPadding决定了边距。

/*** @return a byte array of horizontal pixels (0 = white, 1 = black)*/private static BitMatrix renderResult(boolean[] code, int width, int height, int sidesMargin) {int inputWidth = code.length;// Add quiet zone on both sides.int fullWidth = inputWidth + sidesMargin;int outputWidth = Math.max(width, fullWidth);int outputHeight = Math.max(1, height);int multiple = outputWidth / fullWidth;int leftPadding = (outputWidth - (inputWidth * multiple)) / 2;BitMatrix output = new BitMatrix(outputWidth, outputHeight);for (int inputX = 0, outputX = leftPadding; inputX < inputWidth; inputX++, outputX += multiple) {if (code[inputX]) {output.setRegion(outputX, 0, multiple, outputHeight);}}return output;}

这里只改了Code 128，

import com.google.zxing.BarcodeFormat;
import com.google.zxing.EncodeHintType;
import com.google.zxing.Writer;
import com.google.zxing.WriterException;
import com.google.zxing.client.j2se.MatrixToImageWriter;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.oned.Code128Writer;import javax.imageio.ImageIO;
import java.awt.image.BufferedImage;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.util.HashMap;
import java.util.Map;/*** @author wby* @date 2020/11/2*/
public class CodeBar128Util implements Writer {private static String format = "png";//生成条形码图片类型public static void main(String[] args) throws Exception {getCodeBar("AMB02-0001-OCKSDJ-02", 335, 40);}/*** 生成条码方法** @param content* @param width* @param height* @return* @throws Exception*/public static void getCodeBar(String content, int width, int height) throws Exception {HashMap<EncodeHintType, Comparable> hints = new HashMap<EncodeHintType, Comparable>();hints.put(EncodeHintType.CHARACTER_SET, "utf-8");hints.put(EncodeHintType.MARGIN, 3);BitMatrix encode = new CodeBar128Util().encode(content, BarcodeFormat.CODE_128, width, height, hints);BufferedImage bufferedImage = MatrixToImageWriter.toBufferedImage(encode);ImageIO.write(bufferedImage, "bmp", new FileOutputStream(new File("d://testBarcode_1.bmp")));}public static byte[] getCodeBar(String content) {HashMap<EncodeHintType, Comparable> hints = new HashMap<EncodeHintType, Comparable>();hints.put(EncodeHintType.CHARACTER_SET, "utf-8");hints.put(EncodeHintType.MARGIN, 3);ByteArrayOutputStream ot = new ByteArrayOutputStream();try {//设置宽高比例，自己调，这里主要是固定了宽度，高度不一致int width = new Code128Writer().encode(content).length;int height = width / 2;BitMatrix bm = new CodeBar128Util().encode(content, BarcodeFormat.CODE_128, width, height, hints);MatrixToImageWriter.writeToStream(bm, format, ot);} catch (Exception e) {e.printStackTrace();}return ot.toByteArray();}@Overridepublic final BitMatrix encode(String contents, BarcodeFormat format, int width, int height)throws WriterException {return encode(contents, format, width, height, null);}/*** Encode the contents following specified format.* {@code width} and {@code height} are required size. This method may return bigger size* {@code BitMatrix} when specified size is too small. The user can set both {@code width} and* {@code height} to zero to get minimum size barcode. If negative value is set to {@code width}* or {@code height}, {@code IllegalArgumentException} is thrown.*/@Overridepublic BitMatrix encode(String contents,BarcodeFormat format,int width,int height,Map<EncodeHintType, ?> hints) throws WriterException {if (contents.isEmpty()) {throw new IllegalArgumentException("Found empty contents");}if (width < 0 || height < 0) {throw new IllegalArgumentException("Negative size is not allowed. Input: "+ width + 'x' + height);}int sidesMargin = 2;if (hints != null && hints.containsKey(EncodeHintType.MARGIN)) {sidesMargin = Integer.parseInt(hints.get(EncodeHintType.MARGIN).toString());}boolean[] code = new Code128Writer().encode(contents);return renderResult(code, width, height, sidesMargin);}/*** @return a byte array of horizontal pixels (0 = white, 1 = black)*/private static BitMatrix renderResult(boolean[] code, int width, int height, int sidesMargin) {int inputWidth = code.length;int fullWidth = inputWidth;int outputWidth;if (width % inputWidth == 0) {outputWidth = width;}outputWidth = width > inputWidth ? width / inputWidth * inputWidth : (width / inputWidth + 1) * inputWidth;int outputHeight = Math.max(1, height);int multiple = outputWidth / fullWidth;int leftPadding = sidesMargin;BitMatrix output = new BitMatrix(outputWidth + 2 * sidesMargin, outputHeight);for (int inputX = 0, outputX = leftPadding; inputX < inputWidth; inputX++, outputX += multiple) {if (code[inputX]) {output.setRegion(outputX, 0, multiple, outputHeight);}}return output;}
}

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