客户在业务过程中需要打印条形码,以便追踪每个单品。为了符合客户的条码打印机格式,采用了barcode4j+Apache POI的模式。
一开始用bufferImg读图再转换成byteArray的方法写,发现无法批量插入,十几张条形码只能显示为一张。后面采用了不在本地存储图片,直接用byteArray写入,成功。下面是代码。
public int getExcel(HttpServletRequest request) throws IOException, IllegalArgumentException, IllegalAccessException {
List<BarCode> list = getBarCodeByStatus(0);
if (list != null) {
FileOutputStream fileOut = null;
HSSFClientAnchor anchor = null;
HSSFWorkbook wb = new HSSFWorkbook();
HSSFSheet sheet1 = wb.createSheet("条码打印");
HSSFFont hssfFont = wb.createFont();
hssfFont.setCharSet(HSSFFont.DEFAULT_CHARSET);
hssfFont.setFontHeightInPoints((short) 12);
hssfFont.setFontName("宋体");
sheet1.setDefaultRowHeightInPoints((short) 15);
//画图的顶级管理器,一个sheet只能获取一个(一定要注意这点)
HSSFPatriarch patriarch = sheet1.createDrawingPatriarch();
//先把读进来的图片放到一个ByteArrayOutputStream中,以便产生ByteArray
fileOut = new FileOutputStream(AppConstants.getUploadedPath(request) + "封装袋编码表.xls");
try {
int row1 = 8;
int row2 = 12;
for (BarCode b : list) {
//anchor主要用于设置图片的属性
anchor = new HSSFClientAnchor(0, 0, 1023, 255, (short) 0, row1, (short) 3, row2);
anchor.setAnchorType(3);
//插入图片
patriarch.createPicture(anchor, wb.addPicture(BarCodeUtil.generateByte(b.getCode()), HSSFWorkbook.PICTURE_TYPE_PNG));
//符合客户打印机格式,间隔13行
row1 += 13;
row2 += 13;
b.setPrtStatus(1);
}
// 写入excel文件
wb.write(fileOut);
System.out.println("----Excel文件已生成------");
} catch (Exception e) {
e.printStackTrace();
} finally {
if (fileOut != null) {
try {
fileOut.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
return 0;
} else {
return 1;
}
}
需要导入一个
import org.apache.commons.codec.digest.DigestUtils;
不然会报class not found
barcodeUtil代码
package com.xxt.utils;
import org.apache.fop.util.UnitConv;
import org.krysalis.barcode4j.impl.code39.Code39Bean;
import org.krysalis.barcode4j.output.bitmap.BitmapCanvasProvider;
import java.awt.image.BufferedImage;
import java.io.*;
public class BarCodeUtil {
public static File generateFile(String msg, String path) {
File file = new File(path);
try {
generate(msg, new FileOutputStream(file));
} catch (FileNotFoundException e) {
throw new RuntimeException(e);
}
return file;
}
/**
* 生成字节
*
* @param msg
* @return
*/
public static byte[] generateByte(String msg) {
ByteArrayOutputStream ous = new ByteArrayOutputStream();
generate(msg, ous);
return ous.toByteArray();
}
/**
* 生成到流
*
* @param msg
* @param ous
*/
public static void generate(String msg, OutputStream ous) {
if (StringUtils.isEmpty(msg) || ous == null) {
return;
}
Code39Bean bean = new Code39Bean();
// 精细度
final int dpi = 150;
// module宽度
final double moduleWidth = UnitConv.in2mm(1.0f / dpi);
// 配置对象
bean.setModuleWidth(moduleWidth);
bean.setWideFactor(3);
bean.doQuietZone(false);
String format = "image/png";
try {
// 输出到流
BitmapCanvasProvider canvas = new BitmapCanvasProvider(ous, format, dpi,
BufferedImage.TYPE_BYTE_BINARY, false, 0);
// 生成条形码
bean.generateBarcode(canvas, msg);
// 结束绘制
canvas.finish();
} catch (IOException e) {
throw new RuntimeException(e);
}
}
//导出
}