如何使用Spring，Hibernate和PostgreSQL將數據導出到Excel？

Question

我有一個項目有一個模型類，Person有三個列：id，name和country，它們正確地持久化到PostgreSQL。 結果在List對象中正確找到。 但我想將List數據（顯示在頁面上）導出到Excel。

我創建了一個名為PersonExcelView的類：

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());

    }

}}

這是我的PersonServiceImpl類：

@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();
    }

}

這是我的控制器代碼：

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

這是JSP：

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

單擊導出時，它不會將數據導出到Excel。 錯誤在哪里？

Answer 1

使用以下代碼將數據導出到Excel工作表，並根據您的代碼要求進行更改。

 XSSFWorkbook workbook = new XSSFWorkbook();           
              XSSFSheet spreadsheet = workbook.createSheet("PersonList");         
              XSSFRow row;      
                     for (Object obj : objectArr)// for (Person person : personService.listPersons()) 
                     {
                        Cell cell = row.createCell(cellid++);
                        cell.setCellValue((String)obj);
                     }               
                for(int columnIndex = 0; columnIndex < 24; columnIndex++) {
                      spreadsheet.autoSizeColumn(columnIndex);
                    }

                      if(List.size()!=0)
                      {
                          FileOutputStream out;                      
                          out = new FileOutputStream(new File(file_path));                     
                          workbook.write(out);
                          out.close();
                      }