如何使用Spring，Hibernate和PostgreSQL将数据导出到Excel？

Question

我有一个项目，它有一个模型类，有三个列的人：id，名称和国家，这正确地坚持PostgreSQL。结果在List对象中正确找到。但我想将List数据（显示在页面上）导出到Excel。

我做了一类名为PersonExcelView：

public class PersonExcelView extends AbstractExcelView { 
    private PersonService personService; 
    @Override 
    protected void buildExcelDocument(Map<String, Object> arg0, HSSFWorkbook arg1, HttpServletRequest arg2, 
      HttpServletResponse arg3) throws Exception { 
      HSSFWorkbook workbook = new HSSFWorkbook(); 
      HSSFSheet excelSheet = workbook.createSheet("PersonList"); 
      setExcelHeader(excelSheet); 

     List personList = (List) personService.getPersonList(); 
     setExcelRows(excelSheet,personList); 

    } 

    public void setExcelHeader(HSSFSheet excelSheet) { 
     HSSFRow excelHeader = excelSheet.createRow(0); 
     excelHeader.createCell(0).setCellValue("Id"); 
     excelHeader.createCell(1).setCellValue("Name"); 
     excelHeader.createCell(2).setCellValue("Country"); 
    } 

    public void setExcelRows(HSSFSheet excelSheet, List personList){ 
     int record = 1; 
     for (Person person : personService.listPersons()) { 
      HSSFRow excelRow = excelSheet.createRow(record++); 
      excelRow.createCell(0).setCellValue(person.getId()); 
      excelRow.createCell(1).setCellValue(person.getName()); 
      excelRow.createCell(2).setCellValue(person.getCountry()); 

    } 

}} 

这里是我PersonServiceImpl类：

@Service 
public class PersonServiceImpl implements PersonService { 

    private PersonDAO personDAO; 

    public void setPersonDAO(PersonDAO personDAO) { 
     this.personDAO = personDAO; 
    } 

    @Override 
    @Transactional 
    public void addPerson(Person p) { 
     this.personDAO.addPerson(p); 
    } 

    @Override 
    @Transactional 
    public void updatePerson(Person p) { 
     this.personDAO.updatePerson(p); 
    } 

    @Override 
    @Transactional 
    public List<Person> listPersons() { 
     return this.personDAO.listPersons(); 
    } 

    @Override 
    @Transactional 
    public Person getPersonById(int id) { 
     return this.personDAO.getPersonById(id); 
    } 

    @Override 
    @Transactional 
    public void removePerson(int id) { 
     this.personDAO.removePerson(id); 
    } 

    @Override 
    public List<Person> getPersonList() { 
     // TODO Auto-generated method stub 
     return listPersons(); 
    } 

} 

这里是我的控制器代码：

@RequestMapping(value = "/export", method = RequestMethod.POST) 
    public ModelAndView getExcel() { 
     List personList = (List) personService.getPersonList(); 
     return new ModelAndView("PersonExcelView", "personList", personList); 
    } 

这里是JSP：

<a href="SpringMVCHibernate/export">Export</a></h3> 

当我单击导出时，它不会将数据导出到Excel中。错误在哪里？