| Sample Reference - Schema Reference - Configuration Reference - API (Javadoc)
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| JasperReports - XLS Data Source Sample (version 4.0.1) | |
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| Main Features in This Sample | |
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| XLS Data Source |
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| Secondary Features | |
| Data Sources | |
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 | XLS Data Source | Documented by Sanda Zaharia | ||||
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| Description / Goal |
| How to fill a report using data from an XLS file. | |||
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| Since |
| 3.6.1 | |||
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| Other Samples |
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XLS Data Sources
Report filling is one of the basic operations during the report generation. After the report compilation, report data are read from the report data source, and/or calculated from report expressions, and the generated report sections are filled one by one. Data sources are very useful when data come as a set of structured records, either extracted from a relational database, or loaded from specific files. In order to become more familiar with data source objects please consult the Data Sources section. When reporting data is stored in Microsoft Excel files (XLS), the JRXlsDataSource data source implementation can be used to read it and feed it into the report. The XLS data source uses the JExcelApi library to load the XLS workbook and read
from it. Instances of this data source can be created by supplying either an in-memory
workbook object, a file, or an input stream to read the data from.
Report-field mapping for this data source implementation is very similar to the CSV data source field-mapping explained in the CSV Data Source sample. It works on the assumption that the workbook contains data in a tabular form (rows are records and columns contain report-field values). XLS Data Source Example In our example data records are stored in the /data/XlsDataSource.data.xls file. It contains the same records as in the CSV Data Source sample, but the city and
id columns are separated by an empty column (ie. records contain in fact 6 fields, but
the second field in each record is always empty).
There are no column headers in the .xls file. This means that column names are set independently, as shown in the getDataSource() method in the /src/XlsDataSourceApp.java file:
private static JRXlsDataSource getDataSource() throws JRException
{
JRXlsDataSource ds;
try
{
String[] columnNames = new String[]{"city", "id", "name", "address", "state"};
int[] columnIndexes = new int[]{0, 2, 3, 4, 5};
ds = new JRXlsDataSource(JRLoader.getLocationInputStream("data/XlsDataSource.data.xls"));
ds.setColumnNames(columnNames, columnIndexes);
}
catch (IOException e)
{
throw new JRException(e);
}
return ds;
}
Column names are the same as in the CSV example: city, id, name, address and state.
But they are associated with particular column indexes: 0, 2, 3, 4, 5. The empty column's index (1) is skipped, and doing so,
the empty content of the second column will be neglected.
The JRXlsDataSource object prepared above is passed to the engine at fill time (see again the /src/XlsDataSourceApp.java file):
public void fill() throws JRException
{
long start = System.currentTimeMillis();
//Preparing parameters
Map parameters = new HashMap();
parameters.put("ReportTitle", "Address Report");
parameters.put("DataFile", "XlsDataSource.data.xls - XLS data source");
Set states = new HashSet();
states.add("Active");
states.add("Trial");
parameters.put("IncludedStates", states);
JasperFillManager.fillReportToFile("build/reports/XlsDataSourceReport.jasper", parameters, getDataSource());
System.err.println("Filling time : " + (System.currentTimeMillis() - start));
}
The IncludedStates parameter defined above is used for data filtering. Only records with Active
or Trial states will be taken into account:
<parameter name="IncludedStates" class="java.util.Set"/>
Running the Sample Running the sample requires the Apache Ant library. Make sure that ant is already installed on your system (version 1.5 or later).
In a command prompt/terminal window set the current folder to demo/samples/xlsdatasource within the JasperReports source project and run the > ant test view command.
It will generate all supported document types containing the sample report in the demo/samples/xlsdatasource/build/reports directory.
Then the report will open in the JasperReports internal viewer. |
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