Question

我是jasper报道的新手。我正在尝试从子文件生成pdf，其中包含一些信息，如name，class等和数组marks。我试图将标记数组渲染为表格。我的JSON是

{"data": {"name" : "Johny",
    "class" : "A2",
    "sub" : "cs",
    "interest" : "films",
    "marks" : [{
               "subject" : "Maths",
               "mark" : "24",
               "grade" : "A",
               "remarks" : "",
               "slNo" : "1"
               },
               {
               "subject" : "English",
               "mark" : "24",
               "grade" : "A",
               "remarks" : "",
               "slNo" : "2"
               },

               ]
}}

我已将子数据源表达式设为

<dataSourceExpression><![CDATA[((net.sf.jasperreports.engine.data.JsonDataSource)$P{REPORT_DATA_SOURCE}).subDataSource()]]></dataSourceExpression>

完整的jrxml - Here

现在我从java中调用它们，

File jsonFile = new File("/Volumes/Johny/Work/EclipseWorkspace/SecondReport/res/Marks.Json");
JasperDesign jasperDesign = JRXmlLoader.load(new File("/Volumes/Johny/Work/EclipseWorkspace/SecondReport/res/First.jrxml"));
JasperReport jasperReport = JasperCompileManager.compileReport(jasperDesign);

parameters.put(JsonQueryExecuterFactory.JSON_INPUT_STREAM, new FileInputStream(jsonFile));
JasperPrint jasperPrint = JasperFillManager.fillReport(jasperReport, parameters);
JasperExportManager.exportReportToPdfFile(jasperPrint, "/Users/johnykutty/Desktop/Sample2.pdf");

其他字段已填充，但表值变为空。

Answer 1

从here找到答案问题是我必须在dataSourceExpression中传递数组的密钥。因此，dataSourceExpression应该像

<dataSourceExpression><![CDATA[((net.sf.jasperreports.engine.data.JsonDataSource)$P{REPORT_DATA_SOURCE}).subDataSource("marks")]]></dataSourceExpression>

请注意subDataSource()方法

的“标记”参数

表字段的JsonDataSource获取空Jasper报告

1 个答案: