creeer OSGi Dienst
De volgende dienst OSGI werd gecreeerd om de voorgelegde gegevens in CSV formaat uit te voeren.
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Lijn 37: Wij hebben toegang tot Apache Sling Connection Pooled DataSource.
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Regel 89: Dit is het ingangspunt aan de dienst.De methode
getCSVFile(..)
neemt in formName als inputparameter en haalt de voorgelegde gegevens betreffende de bepaalde vormnaam.
De code veronderstelt u verbinding samengevoegde DataSource genoemd "aemformstutorial"in de Console van het Web van Felix hebt bepaald.De code veronderstelt ook dat u een schema in het gegevensbestand genoemd aemformstutorial hebt
package com.aemforms.storeandexport.core;
import java.io.IOException;
import java.io.StringReader;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.ArrayList;
import java.util.List;
import javax.sql.DataSource;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.xpath.XPath;
import javax.xml.xpath.XPathConstants;
import javax.xml.xpath.XPathExpressionException;
import javax.xml.xpath.XPathFactory;
import org.osgi.service.component.annotations.Component;
import org.osgi.service.component.annotations.Reference;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.w3c.dom.Document;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;
@Component(service = StoreAndExport.class)
public class StoreAndExportImpl implements StoreAndExport {
private final Logger log = LoggerFactory.getLogger(getClass());
@Reference
StoreAndExportConfigurationService config;
@Reference(target = "(&(objectclass=javax.sql.DataSource)(datasource.name=aemformstutorial))")
private DataSource dataSource;
private List<String> getRowValues(String row) {
List<String> rowValues = new ArrayList<String>();
//API to obtain DOM Document instance
DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
DocumentBuilder builder = null;
try {
builder = factory.newDocumentBuilder();
Document doc = builder.parse(new InputSource(new StringReader(row)));
XPathFactory xpf = XPathFactory.newInstance();
XPath xpath = xpf.newXPath();
Node dataNode = (Node) xpath.evaluate("//afData/afUnboundData/data", doc, XPathConstants.NODE);
NodeList dataElements = dataNode.getChildNodes();
for (int i = 0; i < dataElements.getLength(); i++) {
log.debug("The name of the node is" + dataElements.item(i).getNodeName() + " the node value is " + dataElements.item(i).getTextContent());
rowValues.add(i, dataElements.item(i).getTextContent());
}
return rowValues;
} catch (Exception e) {
log.debug(e.getMessage());
}
return null;
}
private List<String> getHeaderValues(String row) {
DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
List<String> rowValues = new ArrayList<String>();
DocumentBuilder builder = null;
try {
//Create DocumentBuilder with default configuration
builder = factory.newDocumentBuilder();
Document doc = builder.parse(new InputSource(new StringReader(row)));
XPathFactory xpf = XPathFactory.newInstance();
XPath xpath = xpf.newXPath();
Node dataNode = (Node) xpath.evaluate("//afData/afUnboundData/data", doc, XPathConstants.NODE);
NodeList dataElements = dataNode.getChildNodes();
for (int i = 0; i < dataElements.getLength(); i++) {
rowValues.add(i, dataElements.item(i).getNodeName());
}
return rowValues;
} catch (Exception e) {
log.debug(e.getMessage());
}
return null;
}
@Override
public StringBuilder getCSVFile(String formName) {
log.debug("In get CSV File");
String selectStatement = "SELECT " + config.getFORM_DATA_COLUMN() + " FROM aemformstutorial." + config.getTABLE_NAME() + " where " + config.getFORM_NAME_COLUMN() + "='" + formName + "'" + "";
log.debug("The select statment is " + selectStatement);
Connection con = getConnection();
Statement st = null;
ResultSet rs = null;
CSVUtils csvUtils = new CSVUtils();
try {
st = con.createStatement();
rs = st.executeQuery(selectStatement);
log.debug("Got Result Set in getCSVFile");
StringBuilder sb = new StringBuilder();
while (rs.next()) {
if (rs.isFirst()) {
sb = csvUtils.writeLine(getHeaderValues(rs.getString(1)), sb);
}
sb = csvUtils.writeLine(getRowValues(rs.getString(1)), sb);
log.debug("$$$$The current strng buffer is " + sb.toString());
}
return sb;
} catch (Exception e) {
log.debug(e.getMessage());
} finally {
try {
rs.close();
} catch (Exception e) { /* ignored */ }
try {
st.close();
} catch (Exception e) { /* ignored */ }
try {
con.close();
} catch (Exception e) { /* ignored */ }
}
return null;
}
private Connection getConnection() {
log.debug("Getting Connection ");
Connection con = null;
try {
con = dataSource.getConnection();
log.debug("got connection");
return con;
} catch (Exception e) {
log.debug("not able to get connection ");
log.debug(e.getMessage());
}
return null;
}
@Override
public void inserFormData(String formData) {
String formDataColumn = config.getFORM_DATA_COLUMN();
String formNameColumn = config.getFORM_NAME_COLUMN();
String tableName = config.getTABLE_NAME();
String insertStatement = "Insert into aemformstutorial." + tableName + "(" + formDataColumn + "," + formNameColumn + ") VALUES(?,?)";
log.debug("The insert statment is" + insertStatement);
Connection con = getConnection();
PreparedStatement pstmt = null;
try {
DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
DocumentBuilder builder = null;
builder = factory.newDocumentBuilder();
Document xmlDoc = builder.parse(new InputSource(new StringReader(formData)));
XPath xPath = javax.xml.xpath.XPathFactory.newInstance().newXPath();
org.w3c.dom.Node submittedFormNameNode = (org.w3c.dom.Node) xPath.compile("/afData/afSubmissionInfo/afPath").evaluate(xmlDoc, javax.xml.xpath.XPathConstants.NODE);
String paths[] = submittedFormNameNode.getTextContent().split("/");
String formName = paths[paths.length - 1];
log.debug("The form name submiited is" + formName);
pstmt = null;
pstmt = con.prepareStatement(insertStatement);
pstmt.setString(1, formData);
pstmt.setString(2, formName);
log.debug("Executing the insert statment " + pstmt.execute());
con.commit();
} catch (SQLException e) {
log.debug(e.getMessage());
} catch (ParserConfigurationException e) {
log.debug(e.getMessage());
} catch (SAXException e) {
log.debug(e.getMessage());
} catch (IOException e) {
log.debug(e.getMessage());
} catch (XPathExpressionException e) {
log.debug(e.getMessage());
} finally {
try {
pstmt.close();
} catch (Exception e) { /* ignored */ }
try {
con.close();
} catch (Exception e) { /* ignored */ }
}
}
}