java - 如何从自定义数据源创建图表或表格

Question

我正在使用 JasperReports 创建报告，我已经将数据从数据源传递到报告，但是我不确定如何让它与图表或表格一起使用，我确定它是我应该调用的 getdata 函数使用 JrDatasource 表达式，但我不知道如何调用它或包含什么。有人可以帮忙吗？

我尝试过使用参数，但没有使用自定义数据源的示例，只有我见过的其他数据源是 JRBean，这与我实现的不同。

    private static final String[] nameArray = {"Frank", "Joseph", "Marco", "Carl", "Lenny", "Homer", "Teodor", "Leopold"};

    private static final Integer[] ageArray = {50,30,40,46,44,26,32,21};

    private int counter = -1;

    private HashMap<String, Integer> fieldsNumber = new HashMap<String, Integer>();

    private int lastFieldsAdded = 0;

    @Override
    public boolean next() throws JRException {
        if (counter<nameArray.length-1) {
            counter++;
            return true;
        }
        return false;
    }

    @Override
    public Object getFieldValue(JRField jrField) throws JRException {
        Integer fieldIndex;
        if (fieldsNumber.containsKey(jrField.getName()))
            fieldIndex = fieldsNumber.get(jrField.getName());
        else {
            fieldsNumber.put(jrField.getName(), lastFieldsAdded);
            fieldIndex = lastFieldsAdded;
            lastFieldsAdded ++;
        }
        if (fieldIndex == 0) return nameArray[counter];
        else if (fieldIndex == 1) return ageArray[counter];
        return "";
    }

    public Object getFieldValue2(JRField jrField) throws JRException {
        if (jrField.getName().equals("Name")) return nameArray[counter];
        else if (jrField.getName().equals("Age")) return ageArray[counter];
        return "";
    }

    public static JRDataSource getDataSource(){
        return new Implementation();
    }

Jrxml 表：

<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">
                    <datasetRun subDataset="LeveyJenDataset" uuid="0b1d0395-fcd9-471a-b840-e800fbc4cad8">
                        <dataSourceExpression><![CDATA[Implementation()]]></dataSourceExpression>
                    </datasetRun>
                    <jr:column width="100" uuid="3211405d-427f-43db-8d48-babd275bfaa8">
                        <jr:tableHeader style="Table_TH" height="30"/>
                        <jr:tableFooter style="Table_TH" height="30"/>
                        <jr:columnHeader style="Table_CH" height="30">
                            <staticText>
                                <reportElement x="0" y="0" width="100" height="30" uuid="a59d1ac1-555d-487d-8844-4e75510a2ce0"/>
                                <text><![CDATA[Field_1]]></text>
                            </staticText>
                        </jr:columnHeader>
                        <jr:columnFooter style="Table_CH" height="30"/>
                        <jr:detailCell style="Table_TD" height="30">
                            <textField>
                                <reportElement x="0" y="0" width="100" height="30" uuid="995816a4-8066-421b-9a41-650fe35b0a11"/>
                                <textFieldExpression><![CDATA[$F{Field_1}]]></textFieldExpression>
                            </textField>
                        </jr:detailCell>
                    </jr:column>
                    <jr:column width="100" uuid="174224c5-0ff0-41f2-be74-2a32f32d3d5f">
                        <jr:tableHeader style="Table_TH" height="30"/>
                        <jr:tableFooter style="Table_TH" height="30"/>
                        <jr:columnHeader style="Table_CH" height="30">
                            <staticText>
                                <reportElement x="0" y="0" width="100" height="30" uuid="59835446-f3e1-442b-a9fb-55243ec97d10"/>
                                <text><![CDATA[Field_2]]></text>
                            </staticText>
                        </jr:columnHeader>
                        <jr:columnFooter style="Table_CH" height="30"/>
                        <jr:detailCell style="Table_TD" height="30">
                            <textField>
                                <reportElement x="0" y="0" width="100" height="30" uuid="fe462425-2890-4c63-83b3-46d02fb0b7dc"/>
                                <textFieldExpression><![CDATA[$F{Field_2}]]></textFieldExpression>
                            </textField>
                        </jr:detailCell>
                    </jr:column>
                </jr:table>
<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">
                    <datasetRun subDataset="LeveyJenDataset" uuid="0b1d0395-fcd9-471a-b840-e800fbc4cad8">
                        <dataSourceExpression><![CDATA[Implementation()]]></dataSourceExpression>
                    </datasetRun>
                    <jr:column width="100" uuid="3211405d-427f-43db-8d48-babd275bfaa8">
                        <jr:tableHeader style="Table_TH" height="30"/>
                        <jr:tableFooter style="Table_TH" height="30"/>
                        <jr:columnHeader style="Table_CH" height="30">
                            <staticText>
                                <reportElement x="0" y="0" width="100" height="30" uuid="a59d1ac1-555d-487d-8844-4e75510a2ce0"/>
                                <text><![CDATA[Field_1]]></text>
                            </staticText>
                        </jr:columnHeader>
                        <jr:columnFooter style="Table_CH" height="30"/>
                        <jr:detailCell style="Table_TD" height="30">
                            <textField>
                                <reportElement x="0" y="0" width="100" height="30" uuid="995816a4-8066-421b-9a41-650fe35b0a11"/>
                                <textFieldExpression><![CDATA[$F{Field_1}]]></textFieldExpression>
                            </textField>
                        </jr:detailCell>
                    </jr:column>
                    <jr:column width="100" uuid="174224c5-0ff0-41f2-be74-2a32f32d3d5f">
                        <jr:tableHeader style="Table_TH" height="30"/>
                        <jr:tableFooter style="Table_TH" height="30"/>
                        <jr:columnHeader style="Table_CH" height="30">
                            <staticText>
                                <reportElement x="0" y="0" width="100" height="30" uuid="59835446-f3e1-442b-a9fb-55243ec97d10"/>
                                <text><![CDATA[Field_2]]></text>
                            </staticText>
                        </jr:columnHeader>
                        <jr:columnFooter style="Table_CH" height="30"/>
                        <jr:detailCell style="Table_TD" height="30">
                            <textField>
                                <reportElement x="0" y="0" width="100" height="30" uuid="fe462425-2890-4c63-83b3-46d02fb0b7dc"/>
                                <textFieldExpression><![CDATA[$F{Field_2}]]></textFieldExpression>
                            </textField>
                        </jr:detailCell>
                    </jr:column>
                </jr:table>
<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">
                    <datasetRun subDataset="LeveyJenDataset" uuid="0b1d0395-fcd9-471a-b840-e800fbc4cad8">
                        <dataSourceExpression><![CDATA[Implementation()]]></dataSourceExpression>
                    </datasetRun>
                    <jr:column width="100" uuid="3211405d-427f-43db-8d48-babd275bfaa8">
                        <jr:tableHeader style="Table_TH" height="30"/>
                        <jr:tableFooter style="Table_TH" height="30"/>
                        <jr:columnHeader style="Table_CH" height="30">
                            <staticText>
                                <reportElement x="0" y="0" width="100" height="30" uuid="a59d1ac1-555d-487d-8844-4e75510a2ce0"/>
                                <text><![CDATA[Field_1]]></text>
                            </staticText>
                        </jr:columnHeader>
                        <jr:columnFooter style="Table_CH" height="30"/>
                        <jr:detailCell style="Table_TD" height="30">
                            <textField>
                                <reportElement x="0" y="0" width="100" height="30" uuid="995816a4-8066-421b-9a41-650fe35b0a11"/>
                                <textFieldExpression><![CDATA[$F{Field_1}]]></textFieldExpression>
                            </textField>
                        </jr:detailCell>
                    </jr:column>
                    <jr:column width="100" uuid="174224c5-0ff0-41f2-be74-2a32f32d3d5f">
                        <jr:tableHeader style="Table_TH" height="30"/>
                        <jr:tableFooter style="Table_TH" height="30"/>
                        <jr:columnHeader style="Table_CH" height="30">
                            <staticText>
                                <reportElement x="0" y="0" width="100" height="30" uuid="59835446-f3e1-442b-a9fb-55243ec97d10"/>
                                <text><![CDATA[Field_2]]></text>
                            </staticText>
                        </jr:columnHeader>
                        <jr:columnFooter style="Table_CH" height="30"/>
                        <jr:detailCell style="Table_TD" height="30">
                            <textField>
                                <reportElement x="0" y="0" width="100" height="30" uuid="fe462425-2890-4c63-83b3-46d02fb0b7dc"/>
                                <textFieldExpression><![CDATA[$F{Field_2}]]></textFieldExpression>
                            </textField>
                        </jr:detailCell>
                    </jr:column>
                </jr:table>

在这里，我试图将 field_1 和 field_2 放到一个表中，但是它没有为该表输出任何内容，并且它说方法 Implementation() 未为报告定义

标签： javajasper-reportsdatasource

Answer 1

我想通了，我只是手动将数据适配器添加到数据集中。