java - 是否可以使用 Jasper Reports 动态生成报告而不为每个报告生成 jasper？

Question

我必须根据动态提供的各种参数生成报告。在某些上下文中，参数可能为空。例如，来自表 Person 的 id、name、age、sex和 ma​​ritalStatus 作为字段，我必须生成有关 30 岁已婚男性 的报告。有时，可能会要求不考虑年龄而嫁给女性。如果我在这两种情况下都使用相同的碧 Jade ，则在第二种情况下年龄限制将为空。有什么办法可以控制这种情况？

此外，是否可以动态指定应在报告中生成哪些所有字段？

Answer 1

使用 JasperReport API 的示例用于动态生成报告:

    //JasperDesign
    JasperDesign jasperDesign = new JasperDesign();
    jasperDesign.setName("The dynamically generated report");
    jasperDesign.setPageWidth(595);
    jasperDesign.setPageHeight(842);
    jasperDesign.setColumnWidth(515);
    jasperDesign.setColumnSpacing(0);
    jasperDesign.setLeftMargin(40);
    jasperDesign.setRightMargin(40);
    jasperDesign.setTopMargin(50);
    jasperDesign.setBottomMargin(50);

    //Query
    JRDesignQuery query = new JRDesignQuery();
    query.setText("SELECT * FROM Address $P!{OrderByClause}");
    jasperDesign.setQuery(query);

    //Fields
    JRDesignField field = new JRDesignField();
    field.setName("Id");
    field.setValueClass(java.lang.Integer.class);
    jasperDesign.addField(field);

    field = new JRDesignField();
    field.setName("FirstName");
    field.setValueClass(java.lang.String.class);
    jasperDesign.addField(field);

    field = new JRDesignField();
    field.setName("LastName");
    field.setValueClass(java.lang.String.class);
    jasperDesign.addField(field);

    //some code

    //Detail
    band = new JRDesignBand();
    band.setHeight(40);

    JRDesignStaticText staticText = new JRDesignStaticText();
    staticText.setX(0);
    staticText.setY(0);
    staticText.setWidth(60);
    staticText.setHeight(20);
    staticText.setMode(ModeEnum.OPAQUE);
    staticText.setHorizontalAlignment(HorizontalAlignEnum.LEFT);
    staticText.setStyle(boldStyle);
    staticText.setText("ID: ");
    staticText.getLineBox().getLeftPen().setLineWidth(1);
    staticText.getLineBox().getTopPen().setLineWidth(1);
    staticText.getLineBox().setLeftPadding(10);
    band.addElement(staticText);

    textField = new JRDesignTextField();
    textField.setX(60);
    textField.setY(0);
    textField.setWidth(200);
    textField.setHeight(20);
    textField.setHorizontalAlignment(HorizontalAlignEnum.LEFT);
    textField.setStyle(normalStyle);
    expression = new JRDesignExpression();
    expression.setValueClass(java.lang.Integer.class);
    expression.setText("$F{Id}");
    textField.setExpression(expression);
    textField.getLineBox().getTopPen().setLineWidth(1);
    textField.getLineBox().getRightPen().setLineWidth(1);
    textField.getLineBox().setLeftPadding(10);
    band.addElement(textField);

    staticText = new JRDesignStaticText();
    staticText.setX(0);
    staticText.setY(20);
    staticText.setWidth(60);
    staticText.setHeight(20);
    staticText.setMode(ModeEnum.OPAQUE);
    staticText.setHorizontalAlignment(HorizontalAlignEnum.LEFT);
    staticText.setStyle(boldStyle);
    staticText.setText("Name: ");
    staticText.getLineBox().getLeftPen().setLineWidth(1);
    staticText.getLineBox().getBottomPen().setLineWidth(1);
    staticText.getLineBox().setLeftPadding(10);
    band.addElement(staticText);

    textField = new JRDesignTextField();
    textField.setStretchWithOverflow(true);
    textField.setX(60);
    textField.setY(20);
    textField.setWidth(200);
    textField.setHeight(20);
    textField.setPositionType(PositionTypeEnum.FLOAT);
    textField.setStyle(normalStyle);
    expression = new JRDesignExpression();
    expression.setValueClass(java.lang.String.class);
    expression.setText("$F{FirstName} + \" \" + $F{LastName}");
    textField.setExpression(expression);
    textField.getLineBox().getRightPen().setLineWidth(1);
    textField.getLineBox().getBottomPen().setLineWidth(1);
    textField.getLineBox().setLeftPadding(10);
    band.addElement(textField);

    ((JRDesignSection) jasperDesign.getDetailSection()).addBand(band);

您可以在 JasperReports distribution package 的 %JasperReportsFolder%/demo/samples 文件夹中找到更多示例.