• 需要引入的jar包?

poi-3.13.jar、poi-ooxml-3.13.jar、poi-ooxml-schemas-3.13.jar、xmlbeans-2.6.0.jar 。

• maven工程引入方式

<dependency><groupId>org.apache.poi</groupId><artifactId>poi</artifactId><version>3.12</version></dependency><dependency><groupId>org.apache.poi</groupId><artifactId>poi-ooxml</artifactId><version>3.12</version></dependency><dependency><groupId>org.apache.poi</groupId><artifactId>poi-excelant</artifactId><version>3.12</version></dependency><dependency><groupId>org.apache.poi</groupId><artifactId>poi-scratchpad</artifactId><version>3.12</version></dependency>

• 讀取Excel文件

package cn.grap.excel;import java.io.File; import java.io.FileInputStream; import java.io.IOException; import java.io.InputStream; import java.util.ArrayList; import java.util.List;import org.apache.poi.hssf.usermodel.HSSFCell; import org.apache.poi.hssf.usermodel.HSSFWorkbook; import org.apache.poi.ss.usermodel.Cell; import org.apache.poi.ss.usermodel.Row; import org.apache.poi.ss.usermodel.Sheet; import org.apache.poi.ss.usermodel.Workbook; import org.apache.poi.xssf.usermodel.XSSFWorkbook;/** 利用開源組件POI3.0.2動態導出EXCEL文檔 轉載時請保留以下信息，注明出處！* * @author gaol* @version v1.0* @description 讀取exe文件*/ public class ImportExecl {/** 總行數 */private int totalRows = 0;/** 總列數 */private int totalCells = 0;/** 錯誤信息 */private String errorInfo;/** 構造方法 */public ImportExecl() {}/*** * @描述：得到總行數*/public int getTotalRows() {return totalRows;}/*** * @描述：得到總列數*/public int getTotalCells() {return totalCells;}/*** * @描述：得到錯誤信息*/public String getErrorInfo() {return errorInfo;}/*** * @描述：驗證excel文件*/public boolean validateExcel(String filePath) throws Exception{/** 檢查文件名是否為空或者是否是Excel格式的文件 */if (filePath == null || !(isExcel2003(filePath) || isExcel2007(filePath))) {errorInfo = "文件名不是excel格式";throw new Exception("文件名不是excel格式");}/** 檢查文件是否存在 */File file = new File(filePath);if (file == null || !file.exists()) {errorInfo = "文件不存在";throw new Exception("文件不存在");}return true;}/*** * @描述：根據文件名讀取excel文件* */public List<List<String>> read(String filePath) throws Exception{List<List<String>> dataLst = new ArrayList<List<String>>();InputStream is = null;/** 驗證文件是否合法 */if (!validateExcel(filePath)) {System.out.println(errorInfo);return null;}try {/** 判斷文件的類型，是2003還是2007 */boolean isExcel2003 = true;if (isExcel2007(filePath)) {isExcel2003 = false;}/** 調用本類提供的根據流讀取的方法 */File file = new File(filePath);is = new FileInputStream(file);dataLst = read(is, isExcel2003);is.close();} catch (Exception ex) {ex.printStackTrace();throw new Exception("讀取Excel文件出錯!");} finally {if (is != null) {try {is.close();} catch (IOException e) {is = null;e.printStackTrace();}}}/** 返回最后讀取的結果 */return dataLst;}/*** * @描述：根據流讀取Excel文件* */public List<List<String>> read(InputStream inputStream, boolean isExcel2003) throws Exception{List<List<String>> dataLst = null;try {/** 根據版本選擇創建Workbook的方式 */Workbook wb = null;if (isExcel2003) {wb = new HSSFWorkbook(inputStream);} else {wb = new XSSFWorkbook(inputStream);}dataLst = read(wb);} catch (IOException e) {e.printStackTrace();throw new Exception("讀取Excel文件出錯!");}return dataLst;}/*** * @描述：讀取數據*/private List<List<String>> read(Workbook wb) {List<List<String>> dataLst = new ArrayList<List<String>>();/** 得到第一個shell */Sheet sheet = wb.getSheetAt(0);/** 得到Excel的行數 */this.totalRows = sheet.getPhysicalNumberOfRows();/** 得到Excel的列數 */if (this.totalRows >= 1 && sheet.getRow(0) != null) {this.totalCells = sheet.getRow(0).getPhysicalNumberOfCells();}/** 循環Excel的行 */for (int r = 0; r < this.totalRows; r++) {Row row = sheet.getRow(r);if (row == null) {continue;}List<String> rowLst = new ArrayList<String>();/** 循環Excel的列 */for (int c = 0; c < this.getTotalCells(); c++) {Cell cell = row.getCell(c);String cellValue = "";if (null != cell) {// 以下是判斷數據的類型switch (cell.getCellType()) {case HSSFCell.CELL_TYPE_NUMERIC: // 數字cellValue = cell.getNumericCellValue() + "";break;case HSSFCell.CELL_TYPE_STRING: // 字符串cellValue = cell.getStringCellValue();break;case HSSFCell.CELL_TYPE_BOOLEAN: // BooleancellValue = cell.getBooleanCellValue() + "";break;case HSSFCell.CELL_TYPE_FORMULA: // 公式cellValue = cell.getCellFormula() + "";break;case HSSFCell.CELL_TYPE_BLANK: // 空值cellValue = "";break;case HSSFCell.CELL_TYPE_ERROR: // 故障cellValue = "非法字符";break;default:cellValue = "未知類型";break;}}rowLst.add(cellValue);}/** 保存第r行的第c列 */dataLst.add(rowLst);}return dataLst;}/*** * @描述：是否是2003的excel，返回true是2003* * @返回值：boolean*/public static boolean isExcel2003(String filePath) {return filePath.matches("^.+\\.(?i)(xls)$");}/*** * @描述：是否是2007的excel，返回true是2007* * @返回值：boolean*/public static boolean isExcel2007(String filePath) {return filePath.matches("^.+\\.(?i)(xlsx)$");}/**** @描述：main測試方法**/public static void main(String[] args) throws Exception {ImportExecl poi = new ImportExecl();// List<List<String>> list = poi.read("d:/aaa.xls");List<List<String>> list = poi.read("E://a.xls");if (list != null) {for (int i = 0; i < list.size(); i++) {System.out.print("第" + (i) + "行");List<String> cellList = list.get(i);for (int j = 0; j < cellList.size(); j++) {// System.out.print(" 第" + (j + 1) + "列值：");System.out.print(" " + cellList.get(j));}System.out.println();}}} }

• 生成excel文件

package cn.grap.excel;import java.io.FileNotFoundException; import java.io.FileOutputStream; import java.io.IOException; import java.io.OutputStream; import java.lang.reflect.Field; import java.lang.reflect.InvocationTargetException; import java.lang.reflect.Method; import java.text.SimpleDateFormat; import java.util.ArrayList; import java.util.Collection; import java.util.Date; import java.util.Iterator; import java.util.List; import java.util.regex.Matcher; import java.util.regex.Pattern;import javax.swing.JOptionPane;import org.apache.poi.hssf.usermodel.HSSFCell; import org.apache.poi.hssf.usermodel.HSSFCellStyle; import org.apache.poi.hssf.usermodel.HSSFClientAnchor; import org.apache.poi.hssf.usermodel.HSSFComment; import org.apache.poi.hssf.usermodel.HSSFFont; import org.apache.poi.hssf.usermodel.HSSFPatriarch; import org.apache.poi.hssf.usermodel.HSSFRichTextString; import org.apache.poi.hssf.usermodel.HSSFRow; import org.apache.poi.hssf.usermodel.HSSFSheet; import org.apache.poi.hssf.usermodel.HSSFWorkbook; import org.apache.poi.hssf.util.HSSFColor;/*** 利用開源組件POI3.0.2動態導出EXCEL文檔 轉載時請保留以下信息，注明出處！* * @author gaol* @version v1.0* @param <T>* 應用泛型，代表任意一個符合javabean風格的類* 注意這里為了簡單起見，boolean型的屬性xxx的get器方式為getXxx(),而不是isXxx()* byte[]表jpg格式的圖片數據*/ public class ExportExcel<T> {private HSSFWorkbook workbook;public void exportExcel(Collection<T> dataset, OutputStream out) {exportExcel("測試POI導出EXCEL文檔", null, dataset, out, "yyyy-MM-dd");}public void exportExcel(String[] headers, Collection<T> dataset, OutputStream out) {exportExcel("測試POI導出EXCEL文檔", headers, dataset, out, "yyyy-MM-dd");}public void exportExcel(String[] headers, Collection<T> dataset, OutputStream out, String pattern) {exportExcel("測試POI導出EXCEL文檔", headers, dataset, out, pattern);}/*** 這是一個通用的方法，利用了JAVA的反射機制，可以將放置在JAVA集合中并且符號一定條件的數據以EXCEL 的形式輸出到指定IO設備上** @param title* 表格標題名* @param headers* 表格屬性列名數組* @param dataset* 需要顯示的數據集合,集合中一定要放置符合javabean風格的類的對象。此方法支持的* javabean屬性的數據類型有基本數據類型及String,Date,byte[](圖片數據)* @param out* 與輸出設備關聯的流對象，可以將EXCEL文檔導出到本地文件或者網絡中* @param pattern* 如果有時間數據，設定輸出格式。默認為"yyy-MM-dd"*/@SuppressWarnings({ "deprecation" })public void exportExcel(String title, String[] headers, Collection<T> dataset, OutputStream out, String pattern) {workbook = new HSSFWorkbook();// 生成一個表格HSSFSheet sheet = workbook.createSheet(title);// 設置表格默認列寬度為15個字節sheet.setDefaultColumnWidth((short) 15);// 生成一個樣式HSSFCellStyle style = workbook.createCellStyle();// 設置這些樣式style.setFillForegroundColor(HSSFColor.SKY_BLUE.index);style.setFillPattern(HSSFCellStyle.SOLID_FOREGROUND);style.setBorderBottom(HSSFCellStyle.BORDER_THIN);style.setBorderLeft(HSSFCellStyle.BORDER_THIN);style.setBorderRight(HSSFCellStyle.BORDER_THIN);style.setBorderTop(HSSFCellStyle.BORDER_THIN);style.setAlignment(HSSFCellStyle.ALIGN_CENTER);// 生成一個字體HSSFFont font = workbook.createFont();font.setColor(HSSFColor.VIOLET.index);font.setFontHeightInPoints((short) 12);font.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD);// 把字體應用到當前的樣式style.setFont(font);// 生成并設置另一個樣式HSSFCellStyle style2 = workbook.createCellStyle();style2.setFillForegroundColor(HSSFColor.LIGHT_YELLOW.index);style2.setFillPattern(HSSFCellStyle.SOLID_FOREGROUND);style2.setBorderBottom(HSSFCellStyle.BORDER_THIN);style2.setBorderLeft(HSSFCellStyle.BORDER_THIN);style2.setBorderRight(HSSFCellStyle.BORDER_THIN);style2.setBorderTop(HSSFCellStyle.BORDER_THIN);style2.setAlignment(HSSFCellStyle.ALIGN_CENTER);style2.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER);// 生成另一個字體HSSFFont font2 = workbook.createFont();font2.setBoldweight(HSSFFont.BOLDWEIGHT_NORMAL);// 把字體應用到當前的樣式style2.setFont(font2);// 聲明一個畫圖的頂級管理器HSSFPatriarch patriarch = sheet.createDrawingPatriarch();// 定義注釋的大小和位置,詳見文檔HSSFComment comment = patriarch.createComment(new HSSFClientAnchor(0, 0, 0, 0, (short) 4, 2, (short) 6, 5));// 設置注釋內容comment.setString(new HSSFRichTextString("可以在POI中添加注釋！"));// 設置注釋作者，當鼠標移動到單元格上是可以在狀態欄中看到該內容.comment.setAuthor("leno");// 產生表格標題行HSSFRow row = sheet.createRow(0);for (short i = 0; i < headers.length; i++) {HSSFCell cell = row.createCell(i);cell.setCellStyle(style);HSSFRichTextString text = new HSSFRichTextString(headers[i]);cell.setCellValue(text);}// 遍歷集合數據，產生數據行Iterator<T> it = dataset.iterator();int index = 0;while (it.hasNext()) {index++;row = sheet.createRow(index);T t = (T) it.next();// 利用反射，根據javabean屬性的先后順序，動態調用getXxx()方法得到屬性值Field[] fields = t.getClass().getDeclaredFields();for (short i = 0; i < fields.length; i++) {HSSFCell cell = row.createCell(i);cell.setCellStyle(style2);Field field = fields[i];String fieldName = field.getName();String getMethodName = "get" + fieldName.substring(0, 1).toUpperCase() + fieldName.substring(1);try {Class<? extends Object> tCls = t.getClass();Method getMethod = tCls.getMethod(getMethodName, new Class[] {});Object value = getMethod.invoke(t, new Object[] {});// 判斷值的類型后進行強制類型轉換String textValue = null;if (value instanceof Boolean) {boolean bValue = (Boolean) value;textValue = "男";if (!bValue) {textValue = "女";}} else if (value instanceof Date) {Date date = (Date) value;SimpleDateFormat sdf = new SimpleDateFormat(pattern);textValue = sdf.format(date);} else if (value instanceof byte[]) {// 有圖片時，設置行高為60px;row.setHeightInPoints(60);// 設置圖片所在列寬度為80px,注意這里單位的一個換算sheet.setColumnWidth(i, (short) (35.7 * 80));// sheet.autoSizeColumn(i);byte[] bsValue = (byte[]) value;HSSFClientAnchor anchor = new HSSFClientAnchor(0, 0, 1023, 255, (short) 6, index, (short) 6,index);anchor.setAnchorType(2);patriarch.createPicture(anchor, workbook.addPicture(bsValue, HSSFWorkbook.PICTURE_TYPE_JPEG));} else {// 其它數據類型都當作字符串簡單處理textValue = value.toString();}// 如果不是圖片數據，就利用正則表達式判斷textValue是否全部由數字組成if (textValue != null) {Pattern p = Pattern.compile("^//d+(//.//d+)?$");Matcher matcher = p.matcher(textValue);if (matcher.matches()) {// 是數字當作double處理cell.setCellValue(Double.parseDouble(textValue));} else {HSSFRichTextString richString = new HSSFRichTextString(textValue);HSSFFont font3 = workbook.createFont();font3.setColor(HSSFColor.BLUE.index);richString.applyFont(font3);cell.setCellValue(richString);}}} catch (SecurityException e) {// TODO Auto-generated catch blocke.printStackTrace();} catch (NoSuchMethodException e) {// TODO Auto-generated catch blocke.printStackTrace();} catch (IllegalArgumentException e) {// TODO Auto-generated catch blocke.printStackTrace();} catch (IllegalAccessException e) {// TODO Auto-generated catch blocke.printStackTrace();} catch (InvocationTargetException e) {// TODO Auto-generated catch blocke.printStackTrace();} finally {// 清理資源}}}try {workbook.write(out);} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}}public static void main(String[] args) {// 測試學生ExportExcel<DataInfo> ex = new ExportExcel<DataInfo>();String[] headers = { "電話號碼", "姓名", "套餐類型"};List<DataInfo> dataset = new ArrayList<DataInfo>();for (int i = 0; i < 2000; i++) {dataset.add(new DataInfo("15899166122", "13899166122", "17899166122")); }try {OutputStream out = new FileOutputStream("E://a.xls");ex.exportExcel(headers, dataset, out);out.close();JOptionPane.showMessageDialog(null, "導出成功!");System.out.println("excel導出成功！");} catch (FileNotFoundException e) {e.printStackTrace();} catch (IOException e) {e.printStackTrace();}} }

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