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ZXing还是十分强大的，给我们写代码省去了不少事情。先来看看他支持的编码：

言归正传，抓几个例子来看一看如何生成Code 128的条形码。

/** * A method for generating a barcode of some text * * @param string        the string to be converted to barcode, will be a bid in this case * @return              an image representing the barcode to be drawn on a ballot */public static BufferedImage getBarcode(String string){    /* Try to encode the string as a barcode */    try {        Code128Writer writer = new Code128Writer();        BitMatrix bar = writer.encode(string, BarcodeFormat.CODE_128, 264, 48, new HashMap
   
    ());        return MatrixToImageWriter.toBufferedImage(bar);    }    catch (WriterException e){ throw new RuntimeException(e); }}
   

再来一个看得仔细点：

public BufferedImage getCode128(String strCode128) {    BitMatrix bitMatrix;    try {        //  Write Barcode        bitMatrix = new Code128Writer().encode(strCode128, BarcodeFormat.CODE_128, 195, 40, null);        MatrixToImageWriter.toBufferedImage(bitMatrix);        //System.out.println("Code128 Barcode Generated.");        return MatrixToImageWriter.toBufferedImage(bitMatrix);    } catch (Exception e) {        System.out.println("Exception Found." + e.getMessage());    }    return null;}

老外也给了一个不错的例子，往上绘制相关编码，值得一看：

import java.awt.Color;import java.awt.Font;import java.awt.FontMetrics;import java.awt.Graphics2D;import java.awt.RenderingHints;import java.awt.image.BufferedImage;import java.io.IOException;import java.util.Hashtable;import com.google.zxing.BarcodeFormat;import com.google.zxing.EncodeHintType;import com.google.zxing.common.BitMatrix;import com.google.zxing.oned.Code128Writer;import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;// ...// vars width and height have image width and height (int)// var barcodeMessage has the text under the barcode// textBufferedImage img = new BufferedImage(1, 1, BufferedImage.TYPE_INT_RGB); // aux implementationGraphics2D g2d = img.createGraphics();Font font = new Font("Times", Font.PLAIN, 11);g2d.setFont(font);FontMetrics fm = g2d.getFontMetrics();int textWidth = fm.stringWidth(barcodeMessage);int textHeight = fm.getHeight();g2d.dispose();img = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);g2d = img.createGraphics();g2d.setColor(backgroundColor);g2d.fillRect(0, 0, width, height);g2d.setRenderingHint(RenderingHints.KEY_ALPHA_INTERPOLATION, RenderingHints.VALUE_ALPHA_INTERPOLATION_QUALITY);g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);g2d.setRenderingHint(RenderingHints.KEY_COLOR_RENDERING, RenderingHints.VALUE_COLOR_RENDER_QUALITY);g2d.setRenderingHint(RenderingHints.KEY_DITHERING, RenderingHints.VALUE_DITHER_ENABLE);g2d.setRenderingHint(RenderingHints.KEY_FRACTIONALMETRICS, RenderingHints.VALUE_FRACTIONALMETRICS_ON);g2d.setRenderingHint(RenderingHints.KEY_INTERPOLATION, RenderingHints.VALUE_INTERPOLATION_BILINEAR);g2d.setRenderingHint(RenderingHints.KEY_RENDERING, RenderingHints.VALUE_RENDER_QUALITY);g2d.setRenderingHint(RenderingHints.KEY_STROKE_CONTROL, RenderingHints.VALUE_STROKE_PURE);g2d.setFont(font);fm = g2d.getFontMetrics();g2d.setColor(textColor);g2d.drawString(barcodeMessage, Math.round(Math.floor((width-textWidth)/2))-2, height-fm.getAscent());g2d.dispose();// barcodeCode128Writer code128Writer = new Code128Writer();Hashtable
   
     hintMap = new Hashtable
    
     ();hintMap.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);BitMatrix bitMatrix = code128Writer.encode(barcodeMessage, BarcodeFormat.CODE_128, width, height-textHeight-(2*fm.getAscent()), hintMap);// Make the BufferedImage that are to hold the Code128int matrixWidth = bitMatrix.getWidth();int matrixHeight = bitMatrix.getHeight();Graphics2D graphics = (Graphics2D) img.getGraphics();graphics.setColor(textColor);for (int i = 0; i < matrixWidth; i++) {    for (int j = 0; j < matrixHeight; j++) {        if (bitMatrix.get(i, j)) {            graphics.fillRect(i, j+fm.getAscent(), 1, 1);        }    }}
    
   

万事皆容易，只是看你要做到什么程度了。

/** To change this template, choose Tools | Templates* and open the template in the editor.*/package javaapplication1;/**** @author pc*/import com.google.zxing.BarcodeFormat;import com.google.zxing.Writer;import com.google.zxing.client.j2se.MatrixToImageWriter;import com.google.zxing.common.BitMatrix;import com.google.zxing.oned.Code128Writer;import com.google.zxing.pdf417.encoder.PDF417Writer;import com.google.zxing.qrcode.QRCodeWriter;import java.io.File;import java.io.FileOutputStream;public class barcode {    public static void main(String[] args) {        BitMatrix bitMatrix;        Writer writer = new QRCodeWriter();        try {            //  Write Barcode            bitMatrix = new Code128Writer().encode(“123456789”, BarcodeFormat.CODE_128, 150, 80, null);            MatrixToImageWriter.writeToStream(bitMatrix, “png”, new FileOutputStream(new File(“D://code12kk8_123456789.png”)));            System.out.println(“Code128 Barcode Generated.”);            //  Write QR Code            bitMatrix = writer.encode(“123456789”, BarcodeFormat.QR_CODE, 200, 200);            MatrixToImageWriter.writeToStream(bitMatrix, “png”, new FileOutputStream(new File(“D://qrcode_123456789.png”)));            System.out.println(“QR Code Generated.”);            //  Write PDF417            writer = new PDF417Writer();            bitMatrix = writer.encode(“123456789”, BarcodeFormat.PDF_417, 80, 150);            MatrixToImageWriter.writeToStream(bitMatrix, “png”, new FileOutputStream(new File(“D://pdf417_123456789.png”)));            System.out.println(“PDF417 Code Generated.”);        } catch (Exception e) {            System.out.println(“Exception Found.” + e.getMessage());        }    }}

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