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來自字符串的數據源

2014-04-03 90 views
0

我想要使用一個args字符串作爲數據源傳遞給Java來填充我的報告。我一直試圖從字符串創建一個JRXmlDataSource傳入fillreport。我已經嘗試將字符串轉換爲文檔，將字符串轉換爲文件流，並直接加載字符串。我甚至試圖創建一個文件並以這種方式加載它，但沒有任何工作。任何幫助，將不勝感激。來自字符串的數據源

主要方法：

public class Testing { 

    public static void main(String[] args) throws JRException { 
     try { 
      String xmlData = args[0]; 
      JasperReport jasperReport = null; 
      String path = "C:/workspace/testProject/testing/sources/"; 
      JasperPrint jasperPrint = null; 

      Document doc = convertStringToDocument(xmlData); 
      JRXmlDataSource xmlDataSource = new JRXmlDataSource(doc); 

      //Provide path for your JRXML template. 
      String templateName = path + "report2.jrxml"; 

      //Provide path for your final pdf file. 
      String destinationFile = path + "ReportSQL.pdf"; 

      //Compiling the template. 
      jasperReport = JasperCompileManager.compileReport(templateName); 

      //Sending a parameter with the logged in user name as value 
      HashMap parameters = new HashMap(); 

      // Filling the report template with data 
      jasperPrint = JasperFillManager.fillReport(jasperReport, parameters, xmlDataSource); 

      //Sending a Complete print of the report. 
      JasperPrintManager.printReport(jasperPrint, true); 

      //Exporting it to an PDF 
      JasperExportManager.exportReportToPdfFile(jasperPrint, destinationFile); 

     } catch (Exception e) { 
      System.out.println(e); 
     } 
    } 

    private static Document convertStringToDocument(String xmlStr) { 
     DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance(); 
     DocumentBuilder builder; 
     try { 
      builder = factory.newDocumentBuilder(); 
      Document doc = builder.parse(new InputSource(new StringReader(xmlStr))); 
      return doc; 
     } catch (Exception e) { 
      e.printStackTrace(); 
     } 
     return null; 
    } 
}

源字符串：

<?xml version="1.0" encoding="UTF-8"?> 
<DATA> 
    <ROW> 
    <ID>1</ID> 
    <firstName>Testname</firstName> 
    <lastName>Testlast</lastName> 
    <code>12345</code> 
</ROW> 
<ROW> 
    <ID>2</ID> 
    <firstName>John</firstName> 
    <lastName>Doe</lastName> 
    <code>54321</code> 
</ROW> 
<ROW> 
    <ID>3</ID> 
    <firstName>Jane</firstName> 
    <lastName>Doe</lastName> 
    <code>22222</code> 
</ROW> 
<ROW> 
    <ID>4</ID> 
    <firstName>George</firstName> 
    <lastName>Washington</lastName> 
    <code>33333</code> 
</ROW> 
<ROW> 
    <ID>5</ID> 
    <firstName>John</firstName> 
    <lastName>Adams</lastName> 
    <code>44444</code> 
</ROW> 
<ROW> 
    <ID>6</ID> 
    <firstName>Thomas </firstName> 
    <lastName>Jefferson</lastName> 
    <code>55555</code> 
</ROW> 
<ROW> 
    <ID>7</ID> 
    <firstName>James</firstName> 
    <lastName>Madison</lastName> 
    <code>66666</code> 
</ROW> 
<ROW> 
    <ID>8</ID> 
    <firstName>James</firstName> 
    <lastName>Monroe</lastName> 
    <code>77777</code> 
</ROW> 
<ROW> 
    <ID>9</ID> 
    <firstName>John Quency</firstName> 
    <lastName>Adams</lastName> 
    <code>88888</code> 
</ROW> 
<ROW> 
    <ID>10</ID> 
    <firstName>Andrew</firstName> 
    <lastName>Jackson</lastName> 
    <code>99999</code> 
</ROW> 
<ROW> 
    <ID>11</ID> 
    <firstName>Martin Van</firstName> 
    <lastName>Burren</lastName> 
    <code>0</code> 
</ROW> 
    </DATA>

碧玉XML --- report2.jrxml：

 <?xml version="1.0" encoding="UTF-8"?> 
    <jasperReport xmlns="http://jasperreports.sourceforge.net/jasperreports"  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://jasperreports.sourceforge.net/jasperreports http://jasperreports.sourceforge.net/xsd/jasperreport.xsd" name="report1" language="groovy" pageWidth="595" pageHeight="842" columnWidth="555" leftMargin="20" rightMargin="20" topMargin="20" bottomMargin="20" uuid="5263a626-fdd2-43a7-b67e-ced19b4c240b"> 
     <property name="ireport.zoom" value="1.0"/> 
     <property name="ireport.x" value="0"/> 
     <property name="ireport.y" value="0"/> 
     <field name="firstName" class="java.lang.String"> 
      <fieldDescription><![CDATA[]]></fieldDescription> 
     </field> 
     <field name="lastName" class="java.lang.String"> 
       <fieldDescription><![CDATA[]]></fieldDescription> 
     </field> 
     <field name="code" class="java.lang.Integer"> 
      <fieldDescription><![CDATA[]]></fieldDescription> 
     </field> 
     <variable name="testout" class="java.lang.Integer"> 
       <variableExpression><![CDATA[$V{testout}.valueOf($V{testout}.intValue() + 1)]]></variableExpression> 
       <initialValueExpression><![CDATA[$V{testout}.intValue(0)]]></initialValueExpression> 
     </variable> 
     <variable name="variable1" class="java.lang.String"/> 
     <background> 
      <band splitType="Stretch"/> 
     </background> 
     <title> 
      <band height="71" splitType="Stretch"> 
      <staticText> 
      <reportElement mode="Opaque" x="0" y="2" width="555" height="55" forecolor="#000000" backcolor="#6699FF" uuid="d2f1857a-a53f-4b65-8960-ff56856000c4"/> 
       <textElement textAlignment="Center"> 
        <font fontName="SansSerif" size="40"/> 
       </textElement> 
       <text><![CDATA[People Test]]></text> 
      </staticText> 
      </band> 
     </title> 
    <pageHeader> 
     <band height="16" splitType="Stretch"/> 
    </pageHeader> 
    <columnHeader> 
     <band height="33" splitType="Stretch"> 
      <elementGroup> 
       <staticText> 
        <reportElement mode="Opaque" x="360" y="0" width="195" height="20" backcolor="#999999" uuid="2311af72-d724-4003-b5e4-151bc23e41a8"/> 
        <textElement textAlignment="Center"> 
         <font size="14" isBold="true"/> 
        </textElement> 
        <text><![CDATA[Code]]></text> 
       </staticText> 
       <staticText> 
        <reportElement mode="Opaque" x="168" y="0" width="192" height="20" backcolor="#999999" uuid="0fc99eec-a7c3-468f-ba64-30f3140131b2"/> 
        <textElement textAlignment="Center"> 
         <font size="14" isBold="true"/> 
        </textElement> 
        <text><![CDATA[Last]]></text> 
       </staticText> 
       <staticText> 
        <reportElement mode="Opaque" x="0" y="0" width="168" height="20" backcolor="#999999" uuid="b0a4ccab-fff0-4a77-ad52-1e4132a627e2"/> 
        <textElement textAlignment="Center"> 
         <font size="14" isBold="true"/> 
        </textElement> 
        <text><![CDATA[First ]]></text> 
       </staticText> 
      </elementGroup> 
     </band> 
    </columnHeader> 
    <detail> 
     <band height="36" splitType="Stretch"> 
      <textField> 
       <reportElement x="0" y="0" width="168" height="20" uuid="ca9be109-f4d6-48d6-988f-a5d78352e578"/> 
       <textElement textAlignment="Center"/> 
       <textFieldExpression><![CDATA[$F{firstName}]]></textFieldExpression> 
      </textField> 
      <textField> 
       <reportElement x="168" y="0" width="192" height="20" uuid="1255a5e6-59b1-4d49-92e0-c6b64a0cbf93"/> 
       <textElement textAlignment="Center"/> 
       <textFieldExpression><![CDATA[$F{lastName}]]></textFieldExpression> 
      </textField> 
      <textField> 
       <reportElement x="360" y="0" width="195" height="20" uuid="1099096e-17b7-480c-8e9c-ffb50669326a"/> 
       <textElement textAlignment="Center"/> 
       <textFieldExpression><![CDATA[$F{code}]]></textFieldExpression> 
      </textField> 
     </band> 
    </detail> 
    <columnFooter> 
     <band height="28" splitType="Stretch"/> 
    </columnFooter> 
    <pageFooter> 
     <band height="214" splitType="Stretch"> 
      <image> 
       <reportElement mode="Opaque" x="194" y="0" width="166" height="178" backcolor="#000000" uuid="4299a501-2792-4c76-bc6d-506a480fa1a6"/> 
       <imageExpression><![CDATA["C:\\workspace\\testProject\\testing\\sources\\Turkish_Van_Cat.jpg"]]></imageExpression> 
      </image> 
      <textField> 
       <reportElement x="197" y="198" width="163" height="16" uuid="801deb03-5452-4bc6-935e-2c15a8977721"/> 
       <textElement textAlignment="Center"/> 
       <textFieldExpression><![CDATA[$V{PAGE_NUMBER}]]></textFieldExpression> 
      </textField> 
     </band> 
    </pageFooter> 
    <summary> 
     <band height="104" splitType="Stretch"/> 
    </summary> 
</jasperReport>

來源

2014-04-03 Ben Hester

回答

1

你field元素不包含XML路徑表達式。試試這個：

<field name="firstName" class="java.lang.String"> 
    <fieldDescription><![CDATA[DATA/ROW/firstName]]></fieldDescription> 
</field> 
<field name="lastName" class="java.lang.String"> 
    <fieldDescription><![CDATA[DATA/ROW/lastName]]></fieldDescription> 
</field> 
<field name="code" class="java.lang.Integer"> 
    <fieldDescription><![CDATA[DATA/ROW/code]]></fieldDescription> 
</field>

另外，我有時會使用一些小技巧。圍繞創建一個JRXmlDataSource包裝類轉儲字段的內容如碧玉檢索它們：

package <your package here>; 
import net.sf.jasperreports.engine.JRException; 
import net.sf.jasperreports.engine.JRField; 
import net.sf.jasperreports.engine.data.JRXmlDataSource; 

public class MyXmlDataSource extends JRXmlDataSource { 

    public MyXmlDataSource(String x, String y) throws JRException 
    { 
     super(x,y); 
    } 

    public Object getFieldValue(JRField jrField) throws JRException { 
     Object ret = super.getFieldValue(jrField); 
     System.out.println(ret); 
     return ret; 
    } 
}

然後，而不是實例JRXmlDataSource，實例MyXmlDataSource代替。這會讓你知道Jasper從XML中檢索哪些元素。

來源

2014-08-06 15:31:46 mbmast

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