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java - 如何在运行到结束的环绕文本字段中的所有行下创建虚线？

转载 作者：行者123 更新时间：2023-11-30 02:22:10 25 4
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我正在寻找一种方法来创建一个 jasper 报表元素，该元素将动态高度和标签文本框表示为可溢出的 textField

文本框的内容应包含从开始到结束的每一行的虚线。

所需结果的粗略草图。

A rough sketch of the final result.

最终决定

public class JRSplitText {
    private String text;
    private int firstLineCharacterCount = 0;

    private AttributedString attributedString;

    public JRSplitText(String text, String fontName, int fontStyle, float fontSize) {
        this.text = text;

        FontUtil fontUtil = FontUtil.getInstance(DefaultJasperReportsContext.getInstance());
        Font font = fontUtil.getAwtFontFromBundles(fontName, fontStyle, fontSize, Locale.getDefault(), true);

        attributedString = new AttributedString(text);
        attributedString.addAttribute(TextAttribute.FONT, font);
    }

    public String getText(int wrappingWidth) {
        if(text == null) {
            return null;
        }

        AffineTransform transform = new AffineTransform();
        FontRenderContext frc = new FontRenderContext(transform, true, true);

        AttributedCharacterIterator iterator = attributedString.getIterator();
        LineBreakMeasurer measurer = new LineBreakMeasurer(iterator, frc);

        TextLayout layout = measurer.nextLayout(wrappingWidth);
        firstLineCharacterCount = layout.getCharacterCount();

        return text.substring(0, firstLineCharacterCount);
    }

    public JRDataSource getDataSource(int wrappingWidth) {
        if(text == null) {
            return null;
        }

        List<String> list = new ArrayList<>();

        AffineTransform transform = new AffineTransform();
        FontRenderContext frc = new FontRenderContext(transform, true, true);

        AttributedCharacterIterator iterator = attributedString.getIterator();
        LineBreakMeasurer measurer = new LineBreakMeasurer(iterator, frc);
        measurer.setPosition(firstLineCharacterCount);

        while (measurer.getPosition() < iterator.getEndIndex()) {
            TextLayout layout = measurer.nextLayout(wrappingWidth);
            String line = text.substring(measurer.getPosition() - layout.getCharacterCount(), measurer.getPosition());

            list.add(line);
        }

        if(list.isEmpty()) {
            return null;
        }

        return new JRBeanCollectionDataSource(list);
    }
}

并测试 jrxml 文件

<?xml version="1.0" encoding="UTF-8"?>
<!-- Created with Jaspersoft Studio version 6.4.0.final using JasperReports Library version 6.4.1  -->
<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="Blank_A4_1" pageWidth="595" pageHeight="842" columnWidth="555" leftMargin="20" rightMargin="20" topMargin="20" bottomMargin="20" uuid="f9a6be97-9be4-4067-9185-a2a909bd704c">
    <property name="com.jaspersoft.studio.data.defaultdataadapter" value="One Empty Record"/>
    <subDataset name="Dataset1" uuid="ebf3dce1-fb7a-427e-b156-4053fbbdd833">
        <queryString>
            <![CDATA[]]>
        </queryString>
        <field name="_THIS" class="java.lang.String"/>
    </subDataset>
    <parameter name="lorem ipsum" class="java.lang.String"/>
    <parameter name="testParam" class="JRSplitText" isForPrompting="false">
        <parameterDescription><![CDATA[]]></parameterDescription>
        <defaultValueExpression><![CDATA[new JRSplitText($P{lorem ipsum}, "SansSerif", java.awt.Font.BOLD, 10.0f)]]></defaultValueExpression>
    </parameter>
    <queryString>
        <![CDATA[]]>
    </queryString>
    <background>
        <band splitType="Stretch"/>
    </background>
    <columnHeader>
        <band height="16" splitType="Stretch">
            <frame>
                <reportElement x="0" y="0" width="556" height="0" uuid="422c3774-9917-4908-af5d-d695eb4c0af0">
                    <property name="com.jaspersoft.studio.unit.height" value="pixel"/>
                </reportElement>
                <box>
                    <topPen lineWidth="0.0" lineStyle="Solid" lineColor="#000000"/>
                    <leftPen lineWidth="0.0" lineStyle="Solid" lineColor="#000000"/>
                    <bottomPen lineWidth="0.0" lineStyle="Solid" lineColor="#000000"/>
                    <rightPen lineWidth="0.0" lineStyle="Solid" lineColor="#000000"/>
                </box>
                <staticText>
                    <reportElement x="0" y="0" width="100" height="18" uuid="258f51ab-e5f3-4c84-a483-87d03ff4adf7"/>
                    <textElement verticalAlignment="Bottom"/>
                    <text><![CDATA[This is a Label:]]></text>
                </staticText>
                <textField>
                    <reportElement x="100" y="0" width="456" height="18" uuid="aadc75c9-2599-4051-a37d-af3583ec3635"/>
                    <box>
                        <bottomPen lineWidth="1.0" lineStyle="Dotted"/>
                    </box>
                    <textElement verticalAlignment="Bottom">
                        <font fontName="SansSerif" size="10" isBold="true"/>
                        <paragraph leftIndent="2"/>
                    </textElement>
                    <textFieldExpression><![CDATA[$P{testParam}.getText(454)]]></textFieldExpression>
                </textField>
                <staticText>
                    <reportElement x="100" y="18" width="456" height="8" uuid="059e4872-c8f0-44f7-ac32-4e7b42ce1942">
                        <property name="com.jaspersoft.studio.unit.height" value="pixel"/>
                    </reportElement>
                    <textElement textAlignment="Center">
                        <font size="6"/>
                    </textElement>
                    <text><![CDATA[(hint ...)]]></text>
                </staticText>
                <componentElement>
                    <reportElement x="0" y="18" width="556" height="18" isRemoveLineWhenBlank="true" uuid="aaa64777-42be-45ff-8045-9916e75aaf31"/>
                    <jr:list xmlns:jr="http://jasperreports.sourceforge.net/jasperreports/components" xsi:schemaLocation="http://jasperreports.sourceforge.net/jasperreports/components http://jasperreports.sourceforge.net/xsd/components.xsd" printOrder="Vertical">
                        <datasetRun subDataset="Dataset1" uuid="5f0160cd-5fef-43e9-970e-fde5226a2aeb">
                            <dataSourceExpression><![CDATA[$P{testParam}.getDataSource(556)]]></dataSourceExpression>
                        </datasetRun>
                        <jr:listContents height="18" width="556">
                            <textField isBlankWhenNull="false">
                                <reportElement x="0" y="0" width="556" height="18" isRemoveLineWhenBlank="true" uuid="f0ba1742-9bae-452c-9e98-3518e0951571">
                                    <property name="com.jaspersoft.studio.unit.height" value="pixel"/>
                                </reportElement>
                                <box>
                                    <bottomPen lineWidth="1.0" lineStyle="Dotted"/>
                                </box>
                                <textElement verticalAlignment="Bottom">
                                    <font isBold="true"/>
                                    <paragraph leftIndent="0"/>
                                </textElement>
                                <textFieldExpression><![CDATA[$F{_THIS}]]></textFieldExpression>
                            </textField>
                        </jr:listContents>
                    </jr:list>
                </componentElement>
            </frame>
            <staticText>
                <reportElement positionType="Float" x="455" y="0" width="100" height="16" forecolor="#857D7D" uuid="8bee13b8-2322-489b-8ab0-2e3c7c6742d1">
                    <property name="com.jaspersoft.studio.unit.y" value="pixel"/>
                </reportElement>
                <textElement textAlignment="Right"/>
                <text><![CDATA[Static Text]]></text>
            </staticText>
        </band>
    </columnHeader>
</jasperReport>

enter image description here

最佳答案

JasperReports 中没有设置可以让您直接实现此目的，最简单的策略之一可能是将文本转换为数据源，因此是行列表，然后在文本字段中显示每一行，并在下面用虚线显示它。

要创建数据源，我们需要计算何时发生换行，为此我们需要使用 java，我将使用 LineBreakMeasurer

Java 代码将长文本转换为行列表，具体取决于 wrappingWidth 和 Font

public class JRSplitText {

    public static JRDataSource getTextDataSource(String text, int wrappingWidth, String fontName, int fontStyle, int fontSize) {
        // Our list with the different text segements (lines)
        List<String> textSegements = new ArrayList<>();

        // Instance a FontRenderContext
        AffineTransform affinetransform = new AffineTransform();
        FontRenderContext frc = new FontRenderContext(affinetransform, true, true);

        // Instance the AttributedString and it's iterator
        AttributedString attrText = new AttributedString(text);
        // To consider font-extensions lets load font directly from jasper-reports
        FontUtil fontUtil = FontUtil.getInstance(DefaultJasperReportsContext.getInstance());
        Font font = fontUtil.getAwtFontFromBundles(fontName, fontStyle, fontSize, Locale.getDefault(), false);
        attrText.addAttribute(TextAttribute.FONT, font);
        AttributedCharacterIterator styledText = attrText.getIterator();

        // Start measurer how much text can fit in our width and add each line
        // to our list
        LineBreakMeasurer measurer = new LineBreakMeasurer(styledText, frc);
        while (measurer.getPosition() < styledText.getEndIndex()) {
            TextLayout layout = measurer.nextLayout(wrappingWidth);
            String line = text.substring(measurer.getPosition() - layout.getCharacterCount(), measurer.getPosition());
            textSegements.add(line);
        }

        // return a datasource of our lists
        return new JRBeanCollectionDataSource(textSegements);
    }
}

通过类路径中的此代码，我们可以使用文本和字体直接从 jrxml 调用它来获取数据源。

JasperReports - jrxml，我们将使用参数中的一些文本(可以是字段或变量)来调用上面的类，例如我使用 jr:list 组件来迭代数据源，但您也可以使用普通的子报表。

<?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="lineBreakTest" pageWidth="595" pageHeight="842" whenNoDataType="AllSectionsNoDetail" columnWidth="555" leftMargin="20" rightMargin="20" topMargin="20" bottomMargin="20" uuid="597c0716-df6b-42ec-a7c8-863eb1b7174a">
    <property name="com.jaspersoft.studio.data.defaultdataadapter" value="One Empty Record"/>
    <subDataset name="datasource" uuid="6a442aa1-3bf1-494c-9654-e6d3122dd5a7">
        <queryString>
            <![CDATA[]]>
        </queryString>
        <field name="_THIS" class="java.lang.String"/>
    </subDataset>
    <parameter name="text" class="java.lang.String">
        <defaultValueExpression><![CDATA["Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum."]]></defaultValueExpression>
    </parameter>
    <title>
        <band height="18">
            <componentElement>
                <reportElement positionType="Float" x="2" y="0" width="550" height="15" uuid="3a68753d-ac77-4941-9dd9-fdeca5ad2f76"/>
                <jr:list xmlns:jr="http://jasperreports.sourceforge.net/jasperreports/components" xsi:schemaLocation="http://jasperreports.sourceforge.net/jasperreports/components http://jasperreports.sourceforge.net/xsd/components.xsd" printOrder="Vertical">
                    <datasetRun subDataset="datasource" uuid="a76bcffd-57ad-44bf-b2c9-20b89089e440">
                        <dataSourceExpression><![CDATA[jdd.so.JRSplitText.getTextDataSource($P{text},550,"SansSerif",java.awt.Font.PLAIN,10)]]></dataSourceExpression>
                    </datasetRun>
                    <jr:listContents height="15" width="550">
                        <textField>
                            <reportElement x="0" y="0" width="550" height="15" uuid="c9685fa5-a942-4709-9fa9-98e9cc80bc5c"/>
                            <box>
                                <bottomPen lineWidth="1.0" lineStyle="Dotted"/>
                            </box>
                            <textElement>
                                <font fontName="SansSerif" size="10"/>
                            </textElement>
                            <textFieldExpression><![CDATA[$F{_THIS}]]></textFieldExpression>
                        </textField>
                    </jr:listContents>
                </jr:list>
            </componentElement>
        </band>
    </title>
</jasperReport>

输出

result

虚线在屏幕截图中看起来不太好，但这只是屏幕截图问题

Note: wrappingWidth and font parameters, is our width of textField and its font. The line height is controlled by height of textField

关于java - 如何在运行到结束的环绕文本字段中的所有行下创建虚线？，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/46491241/

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