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    <p>Complete example to download a .xls FILE USIGN GWT,apache-poi</p> <ul> <li>Environment : GWT SDK 2.4</li> <li>Spring 3.0.2M</li> <li>JAVA : 1.7</li> </ul> <p>Needed Jar file to create .xls file :: poi-3.0.1-FINAL.jar</p> <pre><code>exportButton.addClickHandler(new ClickHandler() { @Override public void onClick(ClickEvent event) { String link = GWT.getModuleBaseURL() + "myfiledownload"; }//onClick });//addClickHandler </code></pre> <p>now at the browser when the user hits button exportButton then the control navigates to web.xml and searches for url-pattern that ends with /myfiledownload</p> <p>web.xml</p> <pre><code>&lt;servlet&gt; &lt;servlet-name&gt;fileDownload&lt;/servlet-name&gt; &lt;servlet-class&gt;com.sbabamca.server.FileDownloadServlet&lt;/servlet-class&gt; &lt;/servlet&gt; &lt;servlet-mapping&gt; &lt;servlet-name&gt;fileDownload&lt;/servlet-name&gt; &lt;url-pattern&gt;/app/myfiledownload&lt;/url-pattern&gt; &lt;/servlet-mapping&gt; </code></pre> <p>After execuiting the code in web.xml the controls tries to execute the servlet with name FileDownloadServlet</p> <h2>SERVER SIDE</h2> <p><strong>FileDownloadServlet.java</strong></p> <pre><code>import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import javax.servlet.ServletException; import org.apache.poi.hssf.usermodel.HSSFRow; import org.apache.poi.hssf.usermodel.HSSFSheet; import org.apache.poi.hssf.usermodel.HSSFWorkbook; import org.hibernate.Query; import org.hibernate.Session; import org.hibernate.SessionFactory; import org.hibernate.Transaction; import org.hibernate.metadata.ClassMetadata; import com.fpix.hibernate.util.HibernateUtil; import com.fpix.util.date.MyDate; import java.io.IOException; import java.util.ArrayList; public class MyFileServlet extends HttpServlet { SessionFactory sessionFactory; Session session; Transaction tx = null; @SuppressWarnings({ "unchecked", "deprecation" }) protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { resp.setContentType("application/vnd.ms-excel"); resp.setHeader("Content-Disposition", "attachment; filename=users.xls"); try { sessionFactory = HibernateUtil.getSessionFactory(); if(!sessionFactory.getCurrentSession().isOpen()) { session = sessionFactory.openSession(); } else { session = sessionFactory.getCurrentSession(); } tx = session.beginTransaction(); tx.begin(); Query qry = session.createQuery("from com.fpix.dto.User u "); ArrayList&lt;com.fpix.dto.User&gt; u = (ArrayList&lt;com.fpix.dto.User&gt;)qry.list(); Query qry1 = session.createQuery("from com.fpix.dto.Profile p "); ArrayList&lt;com.fpix.dto.Profile&gt; p = (ArrayList&lt;com.fpix.dto.Profile&gt;)qry1.list(); /* * code to get the column name of User and Profile Entity */ ClassMetadata cm = sessionFactory.getClassMetadata(com.fpix.dto.User.class); String userAttributes[] = cm.getPropertyNames(); ClassMetadata cm1 = sessionFactory.getClassMetadata(com.fpix.dto.Profile.class); String profileAttributes[] = cm1.getPropertyNames(); HSSFWorkbook wb = new HSSFWorkbook(); HSSFSheet sheet = wb.createSheet("Excel Sheet"); HSSFRow rowhead = sheet.createRow((short) 0); rowhead.createCell((short) 0).setCellValue("id"); /* * code to create the columns names in .xls file */ int j = 0; for(int i=0;i&lt;userAttributes.length;i++){ j = i; if(!userAttributes[i].equalsIgnoreCase("profileData") ) rowhead.createCell((short) ++j).setCellValue(userAttributes[i]); }//for for(int i=0;i&lt;profileAttributes.length;i++){ if(!profileAttributes[i].equalsIgnoreCase("userData")) rowhead.createCell((short) ++j).setCellValue(profileAttributes[i]); }//for int index = 1; for(int i=0;i&lt;u.size();i++){ HSSFRow row = sheet.createRow((short) index); row.createCell((short) 0).setCellValue(u.get(i).getId()); row.createCell((short) 1).setCellValue(u.get(i).getUser()); row.createCell((short) 2).setCellValue(u.get(i).getPassWord()); row.createCell((short) 3).setCellValue(u.get(i).getType()); row.createCell((short) 4).setCellValue(u.get(i).getRole()); row.createCell((short) 5).setCellValue(u.get(i).getProfile()); row.createCell((short) 6).setCellValue(u.get(i).getEmail()); row.createCell((short) 7).setCellValue(MyDate.timeStampToString(u.get(i).getDor())); // set the Profile data to the excel sheet cells row.createCell((short) 8).setCellValue(p.get(i).getRollNo()); row.createCell((short) 9).setCellValue(p.get(i).getFname()); row.createCell((short) 10).setCellValue(p.get(i).getLname()); row.createCell((short) 11).setCellValue(MyDate.timeStampToString(Long.parseLong(p.get(i).getDoj()))); row.createCell((short) 12).setCellValue(MyDate.timeStampToString(Long.parseLong(p.get(i).getDob()))); row.createCell((short) 13).setCellValue(p.get(i).getBloodGroup()); row.createCell((short) 14).setCellValue(p.get(i).getPhoto()); row.createCell((short) 15).setCellValue(p.get(i).getPhone1()); row.createCell((short) 16).setCellValue(p.get(i).getPhone2()); row.createCell((short) 17).setCellValue(p.get(i).getAddress()); row.createCell((short) 18).setCellValue(p.get(i).getCity()); row.createCell((short) 19).setCellValue(p.get(i).getPin()); row.createCell((short) 20).setCellValue(p.get(i).getState()); row.createCell((short) 21).setCellValue(p.get(i).getCountry()); row.createCell((short) 22).setCellValue(p.get(i).getGrade()); row.createCell((short) 23).setCellValue(p.get(i).getGroups()); row.createCell((short) 24).setCellValue(p.get(i).getAssignCourse()); index++; }//for java.io.OutputStream out = resp.getOutputStream(); wb.write(out); out.close(); System.out.println("Data is Exported to Excel file."); }//try catch (Exception e) { System.out.println(" Data cannot be imported :: getImport() :: ImportExportData "+e); }//catch }//doGet }//class </code></pre>
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    1. POHow to download file on click of button in GWT?
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    1. USLukas Knuth
    1. USsbabamca
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      1. This table or related slice is empty.
      1. VTDownMod
    1. COAll that stuff generating the XLS file is completely irrelevant to the original question which was about a generic file.
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      1. USmadth3
 

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Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

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