JasperReports：访问自定义数据源
我对 JasperReports 还很陌生，我需要从自定义数据源创建报告。为此，我使用两种方法实现了JRDataSource接口：
public class FacultyStudentsDS implements JRDataSource {
@Override
public Object getFieldValue(JRField field) throws JRException {
...
}
@Override
public boolean next() throws JRException {
...
}
}
然后我尝试创建一个PDF文档，这样：
pdf = JasperRunManager.runReportToPdf(reportFile.getAbsolutePath(),
new HashMap(), studentsDS);
我的问题是我不知道如何访问我传递给报表的数据。我不知道在 .jrxml 文件中写什么。如何访问 .jrxml 文件中传递给报告的 studentsDS 变量？
I am quite new to JasperReports and I need to create a report from a custom data source. For this I implemented the JRDataSource interface, with the two methods:
public class FacultyStudentsDS implements JRDataSource {
@Override
public Object getFieldValue(JRField field) throws JRException {
...
}
@Override
public boolean next() throws JRException {
...
}
}
then I try to create a PDF document, this way:
pdf = JasperRunManager.runReportToPdf(reportFile.getAbsolutePath(),
new HashMap(), studentsDS);
My problem is that I do not know how to access the data I pass to the report. I have no idea what to write in the .jrxml file. How do I access the studentsDS variable that I pass to the report, in the .jrxml file?
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您需要有
根据您的需要，您可能不需要创建自己的自定义数据源。通过将 Java beans 的
Collection包装在JRBeanCollectionDataSource您可以使用上述$F{语法访问该集合中 Java bean 的属性。You need to have
<detail>band. Then within that band you can access fields from the data source by using something like the following:Depending on your needs, you might not need to create your own custom data source. By wrapping a
Collectionof Java beans in aJRBeanCollectionDataSourceyou can access the properties of the Java beans in that collection using the above$F{syntax.