如何设置我的 Hashmap<key, list> 作为 jasper 报告的数据源</key,>

Question

I have requirement to display HashMap object as jasper datasource

Map<String, List<obj>> salesMap= new HashMap<>();    
salesMap.put("10/02/2021", List<Obj>);
salesMap.put("11/02/2021", List<Obj>);
salesMap.put("12/02/2021", List<Obj>);

and my datasource

private JRMapCollectionDataSource fuelSalesDataSource;

public Map<String, Object> getDataSources() {
    Map<String, Object> dataSources = new HashMap<>();
    dataSources.put("fuelSalesDataSource", fuelSalesDataSource);
    return dataSources;
}

and my jasper print

    JRMapArrayDataSource dataSource = new JRMapArrayDataSource(
            new Object[] { fuelSalesReportInputMO.getDataSources() });

    JasperReport jasperReport = JasperCompileManager.compileReport(fuel_sales_report);

    JasperPrint jasperPrint = JasperFillManager.fillReport(jasperReport, fuelSalesReportInputMO.getParameters(),
            dataSource);

    reportData = JasperExportManager.exportReportToPdf(jasperPrint);

I have to display the my HashMap in jasper, how to get hash map key and it list of objects in one single row?

       key column          value column          value column     
       10/02/2021         list[0].getType       list[1].getType
       11/02/2021         list[0].getType       list[1].getType.

I have field in jrmxl

<field name="fuelSalesDataSource" class="net.sf.jasperreports.engine.data.JRMapCollectionDataSource"/>

 

How to read map in jrxml by key and its values as list?

Answer 1

Jasper report is a reporting tool, it would be possibile to use a JRMapCollectionDataSource or any other type and then reference the list, the position of an object in a list in a specific text field, but since you are creating your data in java in my opinion you should keep all this logic in java. It has no sense to try to solve your problem in jasper report when you can solve it in a clean way within your java application.

This is what I would have done:

Create a class the represent the output in report

@Data // lombok that generates getter/setter (if you don't have it do them in code)
public class ReportData {   
    private String date;
    private String value1;
    private String value2;
}

Then in java setup the the data

final List<ReportData> data = new ArrayList<>();

//Maybe add some sorting (HashMap is unsorted)?
salesMap.entrySet().stream().forEach(e -> {
    
    ReportData rp = new ReportData();
    rp.setDate(e.getKey());
    //Here you should check size of list etc 
    rp.setValue1(e.getValue().get(0));
    rp.setValue2(e.getValue().get(1));
    data.add(rp)
});

//Then now pass it to report
JasperPrint jasperPrint = JasperFillManager.fillReport(jasperReport, fuelSalesReportInputMO.getParameters(),
            new JRBeanCollectionDataSource(data));

Like this now in jasper report you just field names as in ReportData eg

<field name="date" class="java.lang.String"/>

Answer 2

After re-reading this, I think you're using the wrong data types for your collections. You're using:

JRMapCollectionDataSource which expects a Collection<Map> which is not what you have. You have a single Map which you'd like to iterate though.

which you're wrapping in

JRMapArrayDataSource which expects an Array<Map> which you're just passing in an Array[1] with your single map data collection.

Assuming you want all your dates = row you need to pass in multiple maps. Something that might look like this:

data: [
   { date: "10/02/2021", data: List<Obj>) },
   { date: "11/02/2021", data: List<Obj>) },
   { date: "12/02/2021", data: List<Obj>) },
]

Now you can pass in your JRMapCollectionDataSource directly without wrapping it. Now you can setup your fields as:

• THIS = java.util.Map (if you want direct access)
• date = java.util.Date
• data = java.util.List

which will allow you to setup the report:

[TextField: $F{date}] [List: new JRBeanCollectionDataSource($F{data}), horizontal]

which should give you close to the output you're looking for.

If this is way off the mark, sorry.

Answer 3

i have fixed the issue, and as pointed out by @Petter, i changed my datasource to JRBeanCollectionDataSource from JRMapCollection...

code below

public JRBeanCollectionDataSource  getFuelSalesReportDataSource() {
    Map<String, List<DailyFuelSalesMO>> sortedMap = new TreeMap<>(dailyFuelSalesMap);
    Set<Entry<String,List<DailyFuelSalesMO>>> set = sortedMap.entrySet();
    fuelSalesReportDataSource = new JRBeanCollectionDataSource(set);
    return fuelSalesReportDataSource;
}

and jrxml, i have fields as below..

    <field name="key" class="java.lang.String"/>
    <field name="value[0].fuelObj.type" class="java.lang.Object"/>
    <field name="value[0].fuelObj.priceObj.price" class="java.lang.Double"/>         
    <field name="value[1].fuelObj.type" class="java.lang.Object"/>
    <field name="value[1].fuelObj.priceObj.price" class="java.lang.Double"/>

so i could able to populate in single row, with key, and its list values, in this i have two list object per key, so i could able to get those objects by value[i] for each key object in the hashmap...