com.google.zxing jar 条形码生成

参考地址： https://www.cnblogs.com/manusas/p/6801436.html

package com.wfz.zxing;

import com.google.zxing.*;
import com.google.zxing.client.j2se.BufferedImageLuminanceSource;
import com.google.zxing.client.j2se.MatrixToImageWriter;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.common.HybridBinarizer;
import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;

import javax.imageio.ImageIO;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.FileOutputStream;
import java.util.Hashtable;
import java.util.Map;

/**
 * Created by Liang on 5/3/2017.
 */
public class ZxingUtils {

    /**
     * 生成二维码
     *
     * @param contents
     * @param width
     * @param height
     * @param imgPath
     */
    public void encodeQRCode(String contents, int width, int height, String imgPath) {
        Map hints = new Hashtable<>();
        // 指定纠错等级
        hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.L);
        // 指定编码格式
        hints.put(EncodeHintType.CHARACTER_SET, "GBK");
        try {      //QR_CODE结尾的为生成二维码  要注意高度宽度  信息量越大  二维码越密集
            BitMatrix bitMatrix = new MultiFormatWriter().encode(contents,
                    BarcodeFormat.QR_CODE, width, height, hints);

            MatrixToImageWriter.writeToStream(bitMatrix, "png",
                    new FileOutputStream(imgPath));

        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    /**
     * 解析二维码
     *
     * @param imgPath
     * @return
     */
    public String decodeQRCode(String imgPath) {
        BufferedImage image = null;
        Result result = null;
        try {
            image = ImageIO.read(new File(imgPath));
            if (image == null) {
                System.out.println("the decode image may be not exit.");
            }
            LuminanceSource source = new BufferedImageLuminanceSource(image);
            BinaryBitmap bitmap = new BinaryBitmap(new HybridBinarizer(source));

            Map hints = new Hashtable<>();
            hints.put(DecodeHintType.CHARACTER_SET, "GBK");

            result = new MultiFormatReader().decode(bitmap, hints);
            return result.getText();
        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }

    /**
     * 生成条形码
     *
     * @param contents
     * @param width
     * @param height
     * @param imgPath
     */
    // int width = 105, height = 50; 长度很容易报错:NotFoundException
    public void encodeBarCode(String contents, int width, int height, String imgPath) {
        int codeWidth = 3 + // start guard
                (7 * 6) + // left bars
                5 + // middle guard
                (7 * 6) + // right bars
                3; // end guard
        codeWidth = Math.max(codeWidth, width);
        try {         //条形码貌似只能写入条形码固定规则的信息
            BitMatrix bitMatrix = new MultiFormatWriter().encode(contents,
                    BarcodeFormat.EAN_13, codeWidth, height, null);

            MatrixToImageWriter.writeToStream(bitMatrix, "png",
                    new FileOutputStream(imgPath));

        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    /**
     * 解析条形码
     *
     * @param imgPath
     * @return
     */
    public String decodeBarCode(String imgPath) {
        BufferedImage image = null;
        Result result = null;
        try {
            image = ImageIO.read(new File(imgPath));
            if (image == null) {
                System.out.println("the decode image may be not exit.");
            }
            LuminanceSource source = new BufferedImageLuminanceSource(image);
            BinaryBitmap bitmap = new BinaryBitmap(new HybridBinarizer(source));
/*            Map hints = new Hashtable<>();
            hints.put(DecodeHintType.PURE_BARCODE, Boolean.TRUE);
            hints.put(DecodeHintType.CHARACTER_SET, "utf-8");
            result = new MultiFormatReader().decode(bitmap, hints);*/
            result = new MultiFormatReader().decode(bitmap, null);
            return result.getText();
        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }

}

测试:特别注意 高宽 容易报错:NotFoundException

  public static void main(String[] args) throws Exception {
        String imgPath = "D:\\test.png";
        // 益达无糖口香糖的条形码
        String contents = "6923450657713";
        int width = 105, height = 50;
        ZxingUtils handler = new ZxingUtils();
        handler.encodeBarCode(contents, width, height, imgPath);
        String barcode = handler.decodeBarCode(imgPath);
        System.out.println(barcode);
        handler.encodeQRCode("abc123中文@#\\", 200, 200, imgPath);
        String qrcode = handler.decodeQRCode(imgPath);
        System.out.println(qrcode);
    }

以上是参考信息

这是我的工具类重要信息

// 条码编码规则设定（字符集）
			Map hints = new HashMap();
			hints.put(EncodeHintType.CHARACTER_SET, "GBK");
			// 条码编码
			String info = strCode.toString();           //BarcodeFormat.PDF_417这个是加密的条形码信息
			//info 是想要写入的信息  codeWidh,codeHeight是高度宽度
			BitMatrix bm = new MultiFormatWriter().encode(info, BarcodeFormat.QR_CODE, codeWidth,
					codeHeight, hints);
			bm = deleteWhite(bm);// 去掉白边
			ByteArrayOutputStream bos = new ByteArrayOutputStream(1000);
			// 输出条码到文件流
			MatrixToImageWriter.writeToStream(bm, fileFormat, bos);
			byte[] buffer = bos.toByteArray();
			// 直接输出文件流到页面图片标签（需要Base64编码）
			return ("data:image/png;base64," + (Base64.getEncoder()).encodeToString(buffer));

通过ajax 请求之后， 将图片信息通过base64转码之后， 生成所需要的二进制码，传入 src后面，即可显示图片信息

注：条形码信息规则应需要注意；

2018年6月28日 补充：

直接通过java Controller 返回二维码图片信息

    引入jar包

 
          com.google.zxing
          core
          3.3.2
 

    Goodle提供一个jar包

    引入jar之后，然后通过Contreller直接访问，即可直接返回二维码信息

package com.controller;

import com.google.zxing.BarcodeFormat;
import com.google.zxing.EncodeHintType;
import com.google.zxing.MultiFormatWriter;
import com.google.zxing.WriterException;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import javax.imageio.ImageIO;
import javax.servlet.http.HttpServletResponse;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.util.Hashtable;


@RestController
@RequestMapping(value = "/test")
public class UserController {




    @RequestMapping(value = "aa")
    public String cc(HttpServletResponse response) throws IOException, WriterException {
        BufferedImage bi =  Encode_QR_CODE("sadd");
        ImageIO.write(bi, "jpg", response.getOutputStream());
        return "2132131";
    }

    public static BufferedImage Encode_QR_CODE(String contents) throws IOException, WriterException {
        // String contents = "ZXing 二维码内容1234!"; // 二维码内容
        int width = 200; // 二维码图片宽度 300
        int height = 200; // 二维码图片高度300
        String format = "gif";// 二维码的图片格式 gif
        Hashtable hints = new Hashtable();
        // 指定纠错等级,纠错级别（L 7%、M 15%、Q 25%、H 30%）
        hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);
        // 内容所使用字符集编码
        hints.put(EncodeHintType.CHARACTER_SET, "utf-8");
//      hints.put(EncodeHintType.MAX_SIZE, 350);//设置图片的最大值
//      hints.put(EncodeHintType.MIN_SIZE, 100);//设置图片的最小值
        hints.put(EncodeHintType.MARGIN, 1);//设置二维码边的空度，非负数
        BitMatrix bitMatrix = new MultiFormatWriter().encode(contents,//要编码的内容
                //编码类型，目前zxing支持：Aztec 2D,CODABAR 1D format,Code 39 1D,Code 93 1D ,Code 128 1D,
                //Data Matrix 2D , EAN-8 1D,EAN-13 1D,ITF (Interleaved Two of Five) 1D,
                //MaxiCode 2D barcode,PDF417,QR Code 2D,RSS 14,RSS EXPANDED,UPC-A 1D,UPC-E 1D,UPC/EAN extension,UPC_EAN_EXTENSION
                BarcodeFormat.QR_CODE,
                width, //条形码的宽度
                height, //条形码的高度
                hints);//生成条形码时的一些配置,此项可选
        // 生成二维码
        return toBufferedImage(bitMatrix);
        //  MatrixToImageWriter.writeToFile(bitMatrix, format, outputFile);
    }
    public static BufferedImage toBufferedImage(BitMatrix matrix) {

        int width = matrix.getWidth();

        int height = matrix.getHeight();

        BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);

        for (int x = 0; x < width; x++) {

            for (int y = 0; y < height; y++) {

                image.setRGB(x, y, (matrix.get(x, y) ? BLACK : WHITE));

            }

        }

        return image;

    }
    private static final int BLACK = 0xFF000000;//用于设置图案的颜色

    private static final int WHITE = 0xFFFFFFFF; //用于背景色
}