1. recupero dei dati dal database che costituiscono la “parte variabile” del documento;
   1. Casistica campi singoli
   2. Casistica liste
2. creazione della Stringa xml
3. recupero del template Doc (già caricato in una tabella dei dati)
4. creazione di un nuovo Doc a partire da template e xml

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Enumeration;
import java.util.HashMap;
import java.util.zip.ZipEntry;
import java.util.zip.ZipFile;
import java.util.zip.ZipOutputStream;
 
import javax.servlet.http.HttpServletResponse;
 
import org.apache.poi.util.IOUtils;
 
import com.geowebframework.transfer.objects.webclient.GwBeanDocument;
 
//xml da produrre
String xml="";
 
//1) recupero dei dati
String keyColumn = "id_test";
String itemId = (String) item.get(keyColumn);
 
HashMap<String, Object> valuesMapQuery = new HashMap<String, Object>();
valuesMapQuery.put(keyColumn,itemId);
 
String xmlValue ="questo è un test";
 
//1.1)RECUPERRO DEL VALORE DI UN CAMPO DAL DB
String queryCitta = """select case when descr_city is null then ' ' else descr_city end as descr_city from 
msc_contractor inner join msc_tab_istat_city on msc_contractor.cod_cat_city=msc_tab_istat_city.cod_cat_city where 
cod_contractor=#{map.id_contractor}""";
 
def cittaRes=services.queryService.executeQuery(queryCitta ,valuesMapQuery)
String citta = null;
if(cittaRes!=null && cittaRes.size()>0 && cittaRes.get(0)!=null){
   citta = cittaRes.get(0).get("descr_city");
}
 
//1.2)CREAZIONE DI UNA LISTA A APRTIRE DAI RECORD MULTIPLI
//stringa di appoggio per una lista di elementi
String xml_riferimenti="";
 
String queryRiferimenti="""select case when number_order is null then '' else number_order end as number_order, case when signing_date_order is null then '' else signing_date_order end as signing_date_order from msc_estimate inner join msc_contractor on msc_estimate.id_contractor=msc_contractor.id_contractor where cod_contractor=#{map.id_contractor} and estimate_status='C' and phase_estimate <>'ANN'""";
 
def recordRiferimenti = services.queryService.executeQuery(queryRiferimenti,valuesMapQuery);
String numero_ordine = "";
String data_ordine ="";			
 
DateFormat df = new SimpleDateFormat("dd/MM/yyyy");
 
for(int j=0; j<recordRiferimenti.size(); j++){
    numero_ordine = recordRiferimenti[j].number_order;
    data_ordine = df.format(recordRiferimenti[j].signing_date_order);
 
    xml_riferimenti+="""<ListaRiferimenti>
			   <numero_ordine>${numero_ordine}</numero_ordine>
			   <data_ordine>${data_ordine}</data_ordine>
			</ListaRiferimenti>""";
}
 
 
//2) creazione della Stringa xml;
//
xml ="""<RelazioneTrimestrale>
	    <citta>${citta}</citta>
	    <Liste>		
               ${xml_riferimenti}					
	    </Liste>
	</RelazioneTrimestrale>""";
 
//3) recupero del template Doc
///////////////////////////////////////////////////////////////////
// classe TEMPLATE DOC
String classNameTemplate   = "nome_classe_template";
String attributeColumnName = "nome_attributo_document_template";
///////////////////////////////////////////////////////////////////
GwBeanDocument gwBeanDocument = services.gwDocumentDataService.getDocumentBeanByItemIdAndAttributeColumnName(classNameTemplate,itemId,attributeColumnName);
//nome della cartella per i file temporanei
String tempDestDirName = "gwdocxmltemp";
File tempFile = null;
if(gwBeanDocument!=null && gwBeanDocument.getIs()!=null ){
	File tempDir = new File(System.getProperty("java.io.tmpdir"), tempDestDirName);
    String tempDirPath = tempDir.getPath();
    log.debug("GEOWEB_DEBUG: If doesn't already exist, trying to create the directory named by this path:"+tempDirPath);						
    if (!tempDir.exists()) {
       if (!tempDir.mkdir())				
    	   throw new IOException("Could not create directory: " + tempDirPath);
       else
          log.debug("GEOWEB_DEBUG: (FileManagerService) - The folder in the path " + tempDirPath + " was created");
    }
	tempFile = new File(tempDir,gwBeanDocument.getName());
	FileOutputStream output = new FileOutputStream(tempFile);
	IOUtils.copy(gwBeanDocument.getIs() , output);
}else{
    throw new RuntimeException("Template doc non trovato");
}
 
//4) SERVIZIO PER LA CREAZIONE DEL DOC AGGIORNATO:
String contentDisposition ="attachment";
 
//esempi di content type:
//.doc      application/msword
//.docx     application/vnd.openxmlformats-officedocument.wordprocessingml.document
//.xls      application/vnd.ms-excel
//.xlsx     application/vnd.openxmlformats-officedocument.spreadsheetml.sheet
String contentType ="application/vnd.openxmlformats-officedocument.wordprocessingml.document";
httpServletResponse.setContentType(contentType );
httpServletResponse.setHeader("Content-Disposition",contentDisposition+";filename=\""+gwBeanDocument.getName()+"\"");
ZipFile zipFile = new ZipFile(tempFile);
OutputStream out = httpServletResponse.getOutputStream();
ZipOutputStream zos = new ZipOutputStream(out);
 
for(Enumeration e = zipFile.entries(); e.hasMoreElements(); ) {
    ZipEntry entryIn = (ZipEntry) e.nextElement();
    if (!entryIn.getName().equalsIgnoreCase("customXml/item1.xml")) {
        zos.putNextEntry(new ZipEntry(entryIn.getName()));
        InputStream is = zipFile.getInputStream(entryIn);
        IOUtils.copy(is,zos);
    }
    else{
        zos.putNextEntry(new ZipEntry("customXml/item1.xml"));
        byte[] source = (xml).getBytes("UTF-8");
        ByteArrayInputStream bis = new ByteArrayInputStream(source);
        IOUtils.copy(bis,zos);
    }
    zos.closeEntry();
}
zos.close();