使用apache POI在java中将数据写入xls，xlsx，csv文件

在使用Apache POI将一些数据写入Excel表单时遇到问题。 我的代码如下：

public class DataExp implements Serializable { private static final Logger logger = Logger.getLogger(DataExp.class); public static File exportToCsv(List<WebInOutTrx> givenList, List<DataExpTmplt> dataTmpltList) throws IOException { String url = "D:\\"; File file = new File(url); String csv = "D:\\Output.csv"; CSVWriter csvWriter = new CSVWriter(new FileWriter(csv), ','); List<String[]> data = toStringArray(givenList, dataTmpltList); csvWriter.writeAll(data); csvWriter.close(); System.out.println(csv); return file; } private static List<String[]> toStringArray(List<WebInOutTrx> givenList, List<DataExpTmplt> dataTmpltList) throws FileNotFoundException { List<String[]> records = new ArrayList<String[]>(); records.add(new String[]{"sndrName", "noteToBnf", "sndrPhone","entryUser","sndrAdd"}); Iterator<WebInOutTrx> it = givenList.iterator(); while (it.hasNext()) { WebInOutTrx trx = it.next(); records.add(new String[]{trx.getSndrName(),trx.getNoteToBnf(),trx.getSndrPhone(), trx.getEntryUser(),trx.getSndrAdd()}); } return records; } public static File exportToXLS(List<WebInOutTrx> givenList, List<DataExpTmplt> dataTmpltList) throws IOException, SQLException, ClassNotFoundException, IllegalAccessException, InvocationTargetException, NoSuchMethodException { String url = "D:\\"; File file = new File(url); WebService iWeb = new WebService(); HSSFWorkbook wb = new HSSFWorkbook(); HSSFSheet sheet = wb.createSheet("Sample sheet"); int rowFlag = 0; int rowCount=givenList.size(); int columnCount=dataTmpltList.size(); int columnFlag=0; while (rowFlag != rowCount) { Row row = sheet.createRow(rowFlag); Iterator<WebInOutTrx> it = givenList.iterator(); while (columnFlag != columnCount) { String fieldName = dataTmpltList.get(columnFlag).getFieldName(); Cell cell = row.createCell(columnFlag); WebInOutTrx tempObj = givenList.get(rowFlag); Object obj = PropertyUtils.getProperty(givenList.get(rowFlag), fieldName); if (obj != null) { cell.setCellValue(obj.toString()); } columnFlag++; } rowFlag++; } FileOutputStream out = new FileOutputStream(new File("D:\\Result.xls")); { wb.write(out); out.close(); } return file; } } 

这是我的testing课：

 public class DataExpTest { public DataExpTest() { } private static WebService webService; private static List<WebInOutTrx> webInOutList=new ArrayList<WebInOutTrx>(); private DataExp dataExp = new DataExp(); private List<DataExpTmplt> dataTmpltList = new ArrayList<DataExpTmplt> (); @BeforeClass public static void setUpClass() { WebInOutTrx temp=new WebInOutTrx(); temp.setSndrName("Abc"); temp.setNoteToBnf("Abc Bnf addr"); temp.setSndrPhone("Abc phone"); temp.setEntryUser("Abc Entry USer"); temp.setSndrAdd("Abc Sndr Addr"); webInOutList.add(temp); temp.setSndrName("Abc"); temp.setNoteToBnf("Abc Bnf addr1"); temp.setSndrPhone("Abc phone1"); temp.setEntryUser("Abc Entry USer1"); temp.setSndrAdd("Abc Sndr Addr1"); webInOutList.add(temp); } @AfterClass public static void tearDownClass() { } @Before public void setUp() { dataTmpltList.add(new DataExpTmplt(1, "sndrName", "String")); dataTmpltList.add(new DataExpTmplt(2, "noteToBnf", "String")); dataTmpltList.add(new DataExpTmplt(3, "sndrPhone", "String")); dataTmpltList.add(new DataExpTmplt(4, "entryUser", "String")); dataTmpltList.add(new DataExpTmplt(5, "sndrAdd", "String")); } @After public void tearDown() { } @Test public void testGetWebList() { assertFalse(webInOutList.isEmpty()); } @Test public void testCSVExport() throws IOException { assertNotNull(DataExp.exportToCsv(webInOutList,dataTmpltList)); } @Test public void testXLSExport() throws IOException, SQLException, ClassNotFoundException { try { assertNotNull(DataExp.exportToXLS(webInOutList, dataTmpltList)); } catch (IllegalAccessException ex) { System.out.println(ex); } catch (InvocationTargetException ex) { System.out.println(ex); } catch (NoSuchMethodException ex) { System.out.println(ex); } } @Test public void testXLSXExport() throws IOException, SQLException, ClassNotFoundException { try { assertNotNull(DataExp.exportToXLSX(webInOutList, dataTmpltList)); } catch (IllegalAccessException ex) { System.out.println(ex); } catch (InvocationTargetException ex) { System.out.println(ex); } catch (NoSuchMethodException ex) { System.out.println(ex); } } } 

这是我的模板类

 public class DataExpTmplt implements Serializable { public static final long serialVersionUID = 1L; private Integer coloumnIndex; private String fieldName; private String fieldType; List<DataExpTmplt> importTemplate; public List<DataExpTmplt> getImportTemplate() { return importTemplate; } public void setImportTemplate(List<DataExpTmplt> importTemplate) { this.importTemplate = importTemplate; } public DataExpTmplt(){ } public DataExpTmplt(Integer cIndex,String fName,String fType){ this.coloumnIndex=cIndex; this.fieldName=fName; this.fieldType=fType; } public Integer getColoumnIndex() { return coloumnIndex; } public Integer getPOIColumnIndex(){ int temp=coloumnIndex-1; return temp; } public void setColoumnIndex(Integer coloumnIndex) { this.coloumnIndex = coloumnIndex; } public String getFieldName() { return fieldName; } public void setFieldName(String fieldName) { this.fieldName = fieldName; } public String getFieldType() { return fieldType; } public void setFieldType(String fieldType) { this.fieldType = fieldType; } public DataExpTmplt getTypesAtColumnIndex(Integer colIndex){ if(importTemplate==null||importTemplate.isEmpty()){ return null; } for (DataExpTmplt currentTemplateVO : importTemplate) { if(currentTemplateVO.getPOIColumnIndex().equals(colIndex)){ return currentTemplateVO; } } return null; } } 

期望的输出

  Abc AbcBnfaddr Abcphone AbcEntryUser AbcSndrAddr Xyz XyzBnfaddr1 Xyzphone1 XyzEntryUSer1 XyzSndrAddr1 

我想输出应该是这样的，请帮我在这里
感谢你前进..：

有人可以帮助我，或提供一些代码片段？ 谢谢

Answer 1

我想我发现它：

在您的testing中，您将两次添加相同的对象，导致在XLS中生成相同的两行。 当你第二次调用setter时，你也改变了已经传入列表的对象的值。 看到我的更正：

 @BeforeClass public static void setUpClass() { WebInOutTrx temp=new WebInOutTrx(); temp.setSndrName("Abc"); temp.setNoteToBnf("Abc Bnf addr"); temp.setSndrPhone("Abc phone"); temp.setEntryUser("Abc Entry USer"); temp.setSndrAdd("Abc Sndr Addr"); webInOutList.add(temp); //Missing in your code WebInOutTrx temp=new WebInOutTrx(); //End Missing temp.setSndrName("Abc"); temp.setNoteToBnf("Abc Bnf addr1"); temp.setSndrPhone("Abc phone1"); temp.setEntryUser("Abc Entry USer1"); temp.setSndrAdd("Abc Sndr Addr1"); webInOutList.add(temp); } 

这实际上应该创build两个不同的testing行。 如果你想匹配问题（我重新格式化了一下）给出的所需输出，你需要改变为：

 @BeforeClass public static void setUpClass() { WebInOutTrx temp=new WebInOutTrx(); temp.setSndrName("Abc"); temp.setNoteToBnf("Abc Bnf addr"); temp.setSndrPhone("Abc phone"); temp.setEntryUser("Abc Entry USer"); temp.setSndrAdd("Abc Sndr Addr"); webInOutList.add(temp); //Missing in your code WebInOutTrx temp=new WebInOutTrx(); //End Missing temp.setSndrName("Xyz "); temp.setNoteToBnf("Xyz Bnf addr1"); temp.setSndrPhone("Xyz phone1"); temp.setEntryUser("Xyz Entry USer1"); temp.setSndrAdd("Xyz Sndr Addr1"); webInOutList.add(temp); } 

关于列/行计数器

 // int columnFlag=0; //too early here while (rowFlag != rowCount) { Row row = sheet.createRow(rowFlag); int columnFlag=0; //here it belongs - reset columns for every row Iterator<WebInOutTrx> it = givenList.iterator(); while (columnFlag != columnCount) { String fieldName = dataTmpltList.get(columnFlag).getFieldName();