如何删除zxing生成的QRCode的边距? [英] How to remove margin of QRCode generated with zxing?
问题描述
我正在使用com.google.zxing版本3.3.2使用jasper报告生成QRCode. 生成的QRCode具有空格和边距.如何避免这些空格.
I am using com.google.zxing version 3.3.2 to generate QRCode using jasper report. The generated QRCode is having spaces and margin. How can I avoid those spaces.
我找到了添加EncodeHintType.MARGIN,-1的解决方案,但是如何在jasper报告中的图像表达式中添加它.
I found solutions to add EncodeHintType.MARGIN, -1 but how to add this in image expression in jasper report.
下面是我现在使用的图像表达式.
Below is the image expression as of now I am using.
com.google.zxing.client.j2se.MatrixToImageWriter.toBufferedImage(
new com.google.zxing.qrcode.QRCodeWriter().encode(
$F{Code},com.google.zxing.BarcodeFormat.QR_CODE, 300, 300))
推荐答案
添加EncodeHintType.MARGIN
是正确的,但您需要输入0(否则将引发错误)
Adding EncodeHintType.MARGIN
is correct but you need to put 0 (otherwise it will throw an error)
要添加此内容,您可以使用 QRCodeWriter
To add this you can use the second constructor of QRCodeWriter
public BitMatrix encode(String contents,BarcodeFormat format,
int width,int height,Map<EncodeHintType,?> hints)
throws WriterException
这意味着您需要传递一个使用键和值初始化的Map.创建和初始化地图的一种方法是使用 Guava ,它是 ImmutableMap
This means that you need to pass a Map which is initialize with the key and value. One way of creating and initializing maps is to use use Guava and it's ImmutableMap
com.google.common.collect.ImmutableMap.of(com.google.zxing.EncodeHintType.MARGIN,0)
因此,结果表达式将是
com.google.zxing.client.j2se.MatrixToImageWriter.toBufferedImage(
new com.google.zxing.qrcode.QRCodeWriter().encode(
$F{Code},com.google.zxing.BarcodeFormat.QR_CODE, 300, 300,
com.google.common.collect.ImmutableMap.of(com.google.zxing.EncodeHintType.MARGIN,0)))
示例(我已在边框处显示了边距0)
jrxml
<?xml version="1.0" encoding="UTF-8"?>
<jasperReport xmlns="http://jasperreports.sourceforge.net/jasperreports" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://jasperreports.sourceforge.net/jasperreports http://jasperreports.sourceforge.net/xsd/jasperreport.xsd" name="QRCode" pageWidth="595" pageHeight="842" whenNoDataType="AllSectionsNoDetail" columnWidth="555" leftMargin="20" rightMargin="20" topMargin="20" bottomMargin="20" uuid="ee443473-56d0-44df-b5d4-ac3fe82fd9bc">
<queryString>
<![CDATA[]]>
</queryString>
<title>
<band height="200" splitType="Stretch">
<image>
<reportElement x="0" y="0" width="200" height="200" uuid="9236a226-c581-4d35-88d3-c65181090d03"/>
<box>
<pen lineWidth="0.25"/>
<topPen lineWidth="0.25" lineStyle="Solid" lineColor="#000000"/>
<leftPen lineWidth="0.25" lineStyle="Solid" lineColor="#000000"/>
<bottomPen lineWidth="0.25" lineStyle="Solid" lineColor="#000000"/>
<rightPen lineWidth="0.25" lineStyle="Solid" lineColor="#000000"/>
</box>
<imageExpression><![CDATA[com.google.zxing.client.j2se.MatrixToImageWriter.toBufferedImage(
new com.google.zxing.qrcode.QRCodeWriter().encode(
"Hello world",com.google.zxing.BarcodeFormat.QR_CODE, 300, 300,com.google.common.collect.ImmutableMap.of(com.google.zxing.EncodeHintType.MARGIN,0)))]]></imageExpression>
</image>
</band>
</title>
</jasperReport>
结果
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