在jasperreports中添加表边框

<?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="SampleReport" pageWidth="595" pageHeight="842" columnWidth="555" leftMargin="20" rightMargin="20" topMargin="20" bottomMargin="20" uuid="12345678-1234-1234-1234-123456789012">

    <detail>
        <band height="50">
            <componentElement>
                <reportElement x="0" y="0" width="555" height="50"/>
                <jr:table xmlns:jr="http://jasperreports.sourceforge.net/jasperreports/components"
                          xsi:schemaLocation="http://jasperreports.sourceforge.net/jasperreports/components http://jasperreports.sourceforge.net/xsd/components.xsd">
                    <jr:column>
                        <jr:columnHeader>
                            <jr:box>
                                <jr:pen lineWidth="1.0" lineColor="#000000"/>
                            </jr:box>
                            <jr:textField>
                                <reportElement x="0" y="0" width="100" height="20"/>
                                <textElement>
                                    <font size="12" isBold="true"/>
                                </textElement>
                                <textFieldExpression><![CDATA["Header 1"]]></textFieldExpression>
                            </jr:textField>
                        </jr:columnHeader>
                        <jr:detailCell>
                            <jr:box>
                                <jr:pen lineWidth="1.0" lineColor="#000000"/>
                            </jr:box>
                            <jr:textField>
                                <reportElement x="0" y="0" width="100" height="20"/>
                                <textFieldExpression><![CDATA[$F{field1}]]></textFieldExpression>
                            </jr:textField>
                        </jr:detailCell>
                    </jr:column>
                    <!-- 其他列定义 -->
                </jr:table>
            </componentElement>
        </band>
    </detail>
</jasperReport>

import net.sf.jasperreports.engine.*;
import net.sf.jasperreports.engine.design.*;
import net.sf.jasperreports.engine.type.*;

public class JasperReportExample {
    public static void main(String[] args) throws JRException {
        // 创建 JasperDesign 对象
        JasperDesign jasperDesign = new JasperDesign();
        jasperDesign.setName("SampleReport");
        jasperDesign.setPageWidth(595);
        jasperDesign.setPageHeight(842);
        jasperDesign.setColumnWidth(555);
        jasperDesign.setLeftMargin(20);
        jasperDesign.setRightMargin(20);
        jasperDesign.setTopMargin(20);
        jasperDesign.setBottomMargin(20);

        // 创建 Detail Band
        JRDesignBand detailBand = new JRDesignBand();
        detailBand.setHeight(50);
        jasperDesign.setDetail(detailBand);

        // 创建 Table
        JRDesignComponentElement tableElement = new JRDesignComponentElement();
        tableElement.setX(0);
        tableElement.setY(0);
        tableElement.setWidth(555);
        tableElement.setHeight(50);

        JRDesignTable table = new JRDesignTable();
        tableElement.setComponent(table);

        // 创建列
        JRDesignColumn column = new JRDesignColumn();
        column.setWidth(100);

        // 创建列头单元格
        JRDesignCell headerCell = new JRDesignCell();
        headerCell.setWidth(100);
        headerCell.setHeight(20);

        JRDesignBox headerBox = new JRDesignBox();
        JRDesignPen headerPen = new JRDesignPen();
        headerPen.setLineWidth(1f);
        headerPen.setLineColor(Color.BLACK);
        headerBox.setPen(headerPen);
        headerCell.setBox(headerBox);

        JRDesignTextField headerTextField = new JRDesignTextField();
        headerTextField.setX(0);
        headerTextField.setY(0);
        headerTextField.setWidth(100);
        headerTextField.setHeight(20);
        headerTextField.setExpression(new JRDesignExpression("\"Header 1\""));
        headerCell.addElement(headerTextField);

        column.setColumnHeader(headerCell);

        // 创建数据单元格
        JRDesignCell detailCell = new JRDesignCell();
        detailCell.setWidth(100);
        detailCell.setHeight(20);

        JRDesignBox detailBox = new JRDesignBox();
        JRDesignPen detailPen = new JRDesignPen();
        detailPen.setLineWidth(1f);
        detailPen.setLineColor(Color.BLACK);
        detailBox.setPen(detailPen);
        detailCell.setBox(detailBox);

        JRDesignTextField detailTextField = new JRDesignTextField();
        detailTextField.setX(0);
        detailTextField.setY(0);
        detailTextField.setWidth(100);
        detailTextField.setHeight(20);
        detailTextField.setExpression(new JRDesignExpression("$F{field1}"));
        detailCell.addElement(detailTextField);

        column.setDetailCell(detailCell);

        table.addColumn(column);

        detailBand.addElement(tableElement);

        // 编译报表
        JasperReport jasperReport = JasperCompileManager.compileReport(jasperDesign);

        // 填充报表
        JasperPrint jasperPrint = JasperFillManager.fillReport(jasperReport, new HashMap<>(), new JREmptyDataSource());

        // 导出报表
        JasperExportManager.exportReportToPdfFile(jasperPrint, "SampleReport.pdf");
    }
}