（019）IText制作条形码

一、说几句

机关单位的公文条形码生成，统一根据《机关公文二维条码使用规范细则》规范制作。

二、引入工具包

    com.lowagie
    itext
    2.1.7

三、上代码

1、测试demo

package com.barcode;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONArray;
import com.lowagie.text.pdf.BarcodePDF417;
import jj2000.j2k.util.MathUtil;
import org.apache.commons.lang.StringUtils;
import org.json.JSONString;

import javax.imageio.ImageIO;
import javax.imageio.stream.FileImageOutputStream;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.*;
import java.util.HashSet;
import java.util.List;
import java.util.Set;

public class BarcodeDemo {

    public static void main(String[] args) throws IOException {
        createPdf417();
    }

    private static final String codeString = "GB0626-2005^GD000014001300000871^广东省**单位^通知^粤**函〔2013〕1**号^**单位^***标题^无^无^20131031^^打字室^20131031^^|";

    public static void createPdf417() throws IOException {
        BarcodePDF417 pdf = new BarcodePDF417();
        pdf.setText(codeString.getBytes("GBK"));
        Image pdfImg = pdf.createAwtImage(Color.black, Color.white);
        BufferedImage img = new BufferedImage(pdfImg.getWidth(null), pdfImg.getHeight(null), BufferedImage.TYPE_INT_RGB);
        Graphics g = img.getGraphics();

        g.drawImage(pdfImg, 0, 0, Color.white, null);
//        OutputStream os = new BufferedOutputStream(new FileOutputStream("C:/Users/admin/Desktop/pdf417.bmp"));
//        ImageIO.write(img, "PNG", os);

        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        ImageIO.write(img, "PNG", baos);
        byte[] data = baos.toByteArray();
        InputStream is = new ByteArrayInputStream(baos.toByteArray());
        System.out.println("图像输出流：");
        System.out.println(baos.toByteArray());

        byte2image(data, "C:/Users/admin/Desktop/pdf.bmp" );
    }

    //byte数组到图片
    public static void byte2image(byte[] data, String path) {
        if (data.length < 3 || path.equals("")) {return;}
        try {
            FileImageOutputStream imageOutput = new FileImageOutputStream(new File(path));
            imageOutput.write(data, 0, data.length);
            imageOutput.close();
            System.out.println("Make Picture success,Please find image in " + path);
        } catch (Exception ex) {
            System.out.println("Exception: " + ex);
            ex.printStackTrace();
        }
    }
}

2、场景重现

    /**
     * 生成二维条码
     *
     * @param id             文档id
     * @param signSecureTerm 密级后，是否需要标注保密期限 格式例如：绝密30年
     * @return
     */
    @GetMapping("/getDisBarcode")
    public void getDisBarcode(@RequestParam String id, boolean signSecureTerm, HttpServletResponse response) {
        //必须声明图片格式，否则前端无法取到文件流
        response.setContentType("image/png");
        this.disMng.getDisBarcode(id, signSecureTerm,  response);
    }

3、功能实现

    @Override
    public void getDisBarcode(String id, boolean signSecureTerm, String unitName, HttpServletResponse response) {
        String barcodeStr = "GB0626-2005^GD000014001300000871^广东省**单位^通知^粤**函〔2013〕1**号^**单位^***标题^无^无^20131031^^打字室^20131031^^|";

        //2、生成二维条码
        BarcodePDF417 pdf = new BarcodePDF417();
        try {
            pdf.setText(barcodeStr.getBytes("GBK"));
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
            throw new Exception("UnsupportedEncodingException");
        }
        Image pdfImg = pdf.createAwtImage(Color.black, Color.white);
        BufferedImage img = new BufferedImage(pdfImg.getWidth(null), pdfImg.getHeight(null), BufferedImage.TYPE_INT_RGB);
        Graphics g = img.getGraphics();

        g.drawImage(pdfImg, 0, 0, Color.white, null);
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        try {
            ImageIO.write(img, "PNG", baos);
        } catch (IOException e) {
            e.printStackTrace();
            throw new Exception("IOException");
        }

        byte[] fileByte = baos.toByteArray();

        // 设置文件名, 图片转为流的形式返回
        try {
            response.addHeader("Content-Disposition",
                    String.format("attachment;filename*=utf-8'zh_cn'%s", URLEncoder.encode("barcode.png", "UTF-8")));
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        }
        byte[] buffer = new byte[1024];
        InputStream is = new ByteArrayInputStream(fileByte);
        try (
                BufferedInputStream bis = new BufferedInputStream(is);
                OutputStream os = response.getOutputStream();
        ) {
            int i = bis.read(buffer);
            while (i != -1) {
                os.write(buffer, 0, i);
                i = bis.read(buffer);
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

四、参考文章

1、java生成PDF417条码： https://huhongyu.iteye.com/blog/1969400
2、java用Itext生成条形码和二维码：https://wjrko.iteye.com/blog/2256508