在报表中显示报表参数

Question

我正在使用 (gasp) startDate 和 endDate 参数构建报告。 我想在报告中显示这些参数。我尝试了一个带有

的文本字段

• $P{startDate}
• "Text"+$P{startDate}
• DATEFORMAT($P{startDate},"yyyy-MM-dd HH:mm:ss")

但在每次预览尝试时，我都会收到 net.sf.jasperreports.engine.fill.JRExpressionEvalException: Error evaluating expression : 错误。

我确定我错过了一些简单的东西......

Answer 1

RTFStackTrace。

net.sf.jasperreports.engine.JRException: net.sf.jasperreports.engine.fill.JRExpressionEvalException: Error evaluating expression : 
    Source text : DATEFORMAT($P{startDate},"yyyy-MM-dd HH:mm:ss")
    at com.jaspersoft.studio.editor.preview.view.control.ReportControler.fillReport(ReportControler.java:467)
    at com.jaspersoft.studio.editor.preview.view.control.ReportControler.access$18(ReportControler.java:442)
    at com.jaspersoft.studio.editor.preview.view.control.ReportControler$4.run(ReportControler.java:334)
    at org.eclipse.core.internal.jobs.Worker.run(Worker.java:54)
Caused by: net.sf.jasperreports.engine.fill.JRExpressionEvalException: Error evaluating expression : 
    Source text : DATEFORMAT($P{startDate},"yyyy-MM-dd HH:mm:ss")
    at net.sf.jasperreports.engine.fill.JREvaluator.evaluate(JREvaluator.java:263)
    at net.sf.jasperreports.engine.fill.JRCalculator.evaluate(JRCalculator.java:611)
    at net.sf.jasperreports.engine.fill.JRCalculator.evaluate(JRCalculator.java:579)
    at net.sf.jasperreports.engine.fill.JRFillElement.evaluateExpression(JRFillElement.java:1016)
    at net.sf.jasperreports.engine.fill.JRFillTextField.evaluateText(JRFillTextField.java:573)
    at net.sf.jasperreports.engine.fill.JRFillTextField.evaluate(JRFillTextField.java:557)
    at net.sf.jasperreports.engine.fill.JRFillElementContainer.evaluate(JRFillElementContainer.java:259)
    at net.sf.jasperreports.engine.fill.JRFillBand.evaluate(JRFillBand.java:455)
    at net.sf.jasperreports.engine.fill.JRVerticalFiller.fillBandNoOverflow(JRVerticalFiller.java:433)
    at net.sf.jasperreports.engine.fill.JRVerticalFiller.fillPageHeader(JRVerticalFiller.java:397)
    at net.sf.jasperreports.engine.fill.JRVerticalFiller.fillReportStart(JRVerticalFiller.java:258)
    at net.sf.jasperreports.engine.fill.JRVerticalFiller.fillReport(JRVerticalFiller.java:124)
    at net.sf.jasperreports.engine.fill.JRBaseFiller.fill(JRBaseFiller.java:540)
    at net.sf.jasperreports.engine.fill.BaseFillHandle$ReportFill.run(BaseFillHandle.java:120)
    at java.lang.Thread.run(Thread.java:695)
Caused by: java.lang.ClassCastException: java.util.Date cannot be cast to java.sql.Date
    at MyReportName_282540.evaluate(MyReportName_282540:245)
    at net.sf.jasperreports.engine.fill.JREvaluator.evaluate(JREvaluator.java:250)
    ... 14 more

注意：java.util.Date cannot be cast to java.sql.Date

将“类”选项从 java.sql.Date 更改为 java.util.Date（如 an answer elsewhere 所暗示的那样）让报告运行并显示值（对于上面的每个项目符号尝试）。

我保证在此问答之前有很多internet | grep。据此，我猜测Date 的util 形式是参数的首选。