jasperreport生成pdf_jasperreport 导出excel_jasperreport json(22)

6 Report Sections

When building a report design we need to define the content and the layout of its sections. The entire

structure of the report design is based on the following sections: <title>, <pageHeader>,

<columnHeader>, <groupHeader>, <detail>, <groupFooter>, <columnFoter>,

<pageFooter>, <summary>.

Sections are portions of the report template that have a specified height and width and can contain

report elements like lines, rectangles, images or text fields. Those sections are filled repeatedly at report

generating time and make up the final document that is being produced. When declaring the content

and layout of a report section, in an XML report design, we use the generic element <band>.

XML Syntax

<!ELEMENT band (printWhenExpression?, (line | rectangle | image | staticText

| textField | subreport | elementGroup)*)>

<!ATTLIST band

height NMTOKEN "0"

>

<!ELEMENT printWhenExpression (#PCDATA)>

Report sections are sometimes referred as report bands and represent a feature that almost all report

tools have and use in the same way.

Band Height

The attribute height available in a report band declaration specifies the height in pixels for that

particular band and is very important in the overall report design.

The elements contained by a certain report band should always fit the band's dimensions, to avoid

potential bad results when generating the reports. The engine issues a warning if it finds elements

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