excel exportfunktion

office-alexander-logistics-app/src/main/java/com/alexanderlogistics/mahnlauf/ExcelExportController.java

@@ -1,22 +1,30 @@
 package com.alexanderlogistics.mahnlauf;
 
+import java.io.IOException;
+import java.io.OutputStream;
 import java.io.Serializable;
 import java.text.SimpleDateFormat;
 import java.time.YearMonth;
 import java.time.ZoneId;
 import java.util.Calendar;
+import java.util.Collection;
 import java.util.Date;
 import java.util.logging.Logger;
 
+import org.imixs.archive.core.SnapshotService;
+import org.imixs.workflow.FileData;
 import org.imixs.workflow.ItemCollection;
 import org.imixs.workflow.engine.DocumentService;
 import org.imixs.workflow.exceptions.PluginException;
+import org.imixs.workflow.exceptions.QueryException;
 import org.imixs.workflow.faces.data.DocumentController;
 import org.imixs.workflow.faces.data.WorkflowController;
 import org.imixs.workflow.office.forms.CustomFormItem;
 
 import jakarta.annotation.PostConstruct;
 import jakarta.enterprise.context.ConversationScoped;
+import jakarta.faces.context.ExternalContext;
+import jakarta.faces.context.FacesContext;
 import jakarta.inject.Inject;
 import jakarta.inject.Named;
 
@@ -36,6 +44,9 @@ public class ExcelExportController implements Serializable {
 	private static final long serialVersionUID = 1L;
 	private static Logger logger = Logger.getLogger(ExcelExportController.class.getName());
 
+	public static final String ERROR_CONFIG = "CONFIG_ERROR";
+	final String TYPE_TEXTBLOCK = "textblock";
+
 	@Inject
 	protected DocumentService documentService;
 
@@ -45,6 +56,9 @@ public class ExcelExportController implements Serializable {
 	@Inject
 	DocumentController documentController;
 
+	@Inject
+	SnapshotService snapshotService;
+
 	private ItemCollection filter;
 	private CustomFormItem dbtrItem;
 
@@ -69,7 +83,7 @@ public class ExcelExportController implements Serializable {
 	 * 
 	 * @throws PluginException
 	 */
-	public void export() throws PluginException {
+	public String export() throws PluginException {
 
 		logger.info("start export....");
 
@@ -115,7 +129,85 @@ public class ExcelExportController implements Serializable {
 			query += " AND (dbtr.number:" + workflowController.getWorkitem().getItemValueString("dbtr.number") + ")";
 		}
 
+		// load the text block
+		String template = "ausgangsrechnungen-export_template.xlsx";
+		FileData fileData = loadTextBlockFileData("Excel-Export Template", template);
+
+		// do we found the document?
+		if (fileData == null) {
+			throw new PluginException(InkassoExportAdapter.class.getSimpleName(), ERROR_CONFIG,
+					"Missing Excel Export Template - template=" + template + " not found!");
+		}
+		String targetName = "ausgangsrechnungen-export_" + dateformat.format(new Date()) + ".xlsx";
+		fileData.setName(targetName);
+
+		try {
+			// See:
+			// https://stackoverflow.com/questions/9391838/how-to-provide-a-file-download-from-a-jsf-backing-bean
+			download(fileData);
+		} catch (IOException e) {
+			throw new PluginException(InkassoExportAdapter.class.getSimpleName(), ERROR_CONFIG,
+					"Failed to generate Excel Export: " + e.getMessage());
+		}
+
 		logger.info("Query=" + query);
+		return "/pages/admin/excel_export_rechnungsausgang.jsf?faces-redirect=true";
+	}
+
+	/**
+	 * Helper method to initialize a download
+	 * 
+	 * @throws IOException
+	 */
+	public void download(FileData fileData) throws IOException {
+
+		FacesContext facesContext = FacesContext.getCurrentInstance();
+		ExternalContext externalContext = facesContext.getExternalContext();
+
+		externalContext.responseReset();
+		externalContext.setResponseContentType("application/vnd.ms-excel");
+		externalContext.setResponseContentLength(fileData.getContent().length);
+		externalContext.setResponseHeader("Content-Disposition", "attachment; filename=\"" + fileData.getName() + "\"");
+
+		OutputStream output = externalContext.getResponseOutputStream();
+
+		// Now you can write the InputStream of the file to the above OutputStream the
+		// usual way.
+		output.write(fileData.getContent());
+
+		facesContext.responseComplete(); // Important! Otherwise Faces will attempt to render the response which
+											// obviously will fail since it's already written with a file and closed.
+	}
+
+	/**
+	 * This method returns a text-block ItemCollection for a specified name.
+	 * 
+	 * @param name in attribute txtname
+	 * 
+	 *
+	 */
+	private FileData loadTextBlockFileData(String name, String fileName) {
+		ItemCollection textBlockItemCollection = null;
+
+		// load text-block by name....
+		String sQuery = "(type:\"" + TYPE_TEXTBLOCK + "\" AND txtname:\"" + name + "\")";
+		Collection<ItemCollection> col;
+		try {
+			// find the textblock...
+			col = documentService.find(sQuery, 1, 0);
+			if (col.size() > 0) {
+				textBlockItemCollection = col.iterator().next();
+				// fetch the fileData...
+				return snapshotService.getWorkItemFile(textBlockItemCollection.getUniqueID(), fileName);
+
+			} else {
+				logger.warning("Missing text-block : '" + name + "'");
+			}
+		} catch (QueryException e) {
+			logger.warning("getTextBlock - invalid query: " + e.getMessage());
+		}
+
+		return null;
 	}
 
 	/**

office-alexander-logistics-app/src/main/webapp/pages/admin/excel_export_rechnungsausgang.xhtml

@@ -117,9 +117,10 @@
 
 							</div>
 
-							<h:commandButton actionListener="#{excelExportController.export()}"
-								action="/pages/" value="Excel Export starten">
-								<f:ajax render="result_panel" execute="@form" onevent="updatePanel" />
+					x		<h:commandButton actionListener="#{excelExportController.export()}" immediate="true"
+								action="/pages/admin/excel_export_rechnungsausgang.jsf?faces-redirect=true"
+								 value="Excel Export starten">
+								
 							</h:commandButton>
 							<h:commandButton value="#{message.close}" action="notes" />