package t5750.poi.util; import java.io.*; import java.lang.reflect.Field; import java.lang.reflect.InvocationTargetException; import java.lang.reflect.Method; import java.text.SimpleDateFormat; import java.util.*; import java.util.regex.Matcher; import java.util.regex.Pattern; import org.apache.poi.hssf.usermodel.*; import org.apache.poi.hssf.util.HSSFColor; import org.apache.poi.ss.usermodel.*; import org.apache.poi.xssf.usermodel.XSSFRow; import org.apache.poi.xssf.usermodel.XSSFSheet; import org.apache.poi.xssf.usermodel.XSSFWorkbook; import t5750.poi.domain.Book; import t5750.poi.domain.Student; /** * 利用开源组件POI3.0.2动态导出EXCEL文档 * * @version v1.0 * @param <T> * 应用泛型,代表任意一个符合javabean风格的类 * 注意这里为了简单起见,boolean型的属性xxx的get器方式为getXxx(),而不是isXxx() * byte[]表jpg格式的图片数据 */ public class ExcelExportUtil<T> { public void exportExcel(Collection<T> dataset, OutputStream out) { exportExcel(Globals.SHEETNAME, null, dataset, out, "yyyy-MM-dd"); } public void exportExcel(String[] headers, Collection<T> dataset, OutputStream out) { exportExcel(Globals.SHEETNAME, headers, dataset, out, "yyyy-MM-dd"); } public void exportExcel(String[] headers, Collection<T> dataset, OutputStream out, String pattern) { exportExcel(Globals.SHEETNAME, headers, dataset, out, pattern); } /** * 这是一个通用的方法,利用了JAVA的反射机制,可以将放置在JAVA集合中并且符号一定条件的数据以EXCEL 的形式输出到指定IO设备上 * * @param title * 表格标题名 * @param headers * 表格属性列名数组 * @param dataset * 需要显示的数据集合,集合中一定要放置符合javabean风格的类的对象。此方法支持的 * javabean属性的数据类型有基本数据类型及String,Date,byte[](图片数据) * @param out * 与输出设备关联的流对象,可以将EXCEL文档导出到本地文件或者网络中 * @param pattern * 如果有时间数据,设定输出格式。默认为"yyy-MM-dd" */ @SuppressWarnings("unchecked") public void exportExcel(String title, String[] headers, Collection<T> dataset, OutputStream out, String pattern) { // 声明一个工作薄 HSSFWorkbook workbook = new HSSFWorkbook(); // 生成一个表格 HSSFSheet sheet = workbook.createSheet(title); // 设置表格默认列宽度为15个字节 sheet.setDefaultColumnWidth((short) 15); // 生成一个样式 HSSFCellStyle style = workbook.createCellStyle(); // 设置这些样式 style.setFillForegroundColor(HSSFColor.SKY_BLUE.index); style.setFillPattern(FillPatternType.SOLID_FOREGROUND); style.setBorderBottom(BorderStyle.THIN); style.setBorderLeft(BorderStyle.THIN); style.setBorderRight(BorderStyle.THIN); style.setBorderTop(BorderStyle.THIN); style.setAlignment(HorizontalAlignment.CENTER); // 生成一个字体 HSSFFont font = workbook.createFont(); font.setColor(HSSFColor.VIOLET.index); font.setFontHeightInPoints((short) 12); font.setBold(true); // 把字体应用到当前的样式 style.setFont(font); // 生成并设置另一个样式 HSSFCellStyle style2 = workbook.createCellStyle(); style2.setFillForegroundColor(HSSFColor.LIGHT_YELLOW.index); style2.setFillPattern(FillPatternType.SOLID_FOREGROUND); style2.setBorderBottom(BorderStyle.THIN); style2.setBorderLeft(BorderStyle.THIN); style2.setBorderRight(BorderStyle.THIN); style2.setBorderTop(BorderStyle.THIN); style2.setAlignment(HorizontalAlignment.CENTER); style2.setVerticalAlignment(VerticalAlignment.CENTER); // 生成另一个字体 HSSFFont font2 = workbook.createFont(); font2.setBold(false); // 把字体应用到当前的样式 style2.setFont(font2); // 声明一个画图的顶级管理器 HSSFPatriarch patriarch = sheet.createDrawingPatriarch(); // 定义注释的大小和位置,详见文档 HSSFComment comment = patriarch.createComment(new HSSFClientAnchor(0, 0, 0, 0, (short) 4, 2, (short) 6, 5)); // 设置注释内容 comment.setString(new HSSFRichTextString("可以在POI中添加注释!")); // 设置注释作者,当鼠标移动到单元格上是可以在状态栏中看到该内容. comment.setAuthor("leno"); // 产生表格标题行 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); } // 遍历集合数据,产生数据行 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,根据javabean属性的先后顺序,动态调用getXxx()方法得到属性值 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 tCls = t.getClass(); Method getMethod = tCls.getMethod(getMethodName, new Class[] {}); Object value = getMethod.invoke(t, new Object[] {}); // 判断值的类型后进行强制类型转换 String textValue = null; // if (value instanceof Integer) { // int intValue = (Integer) value; // cell.setCellValue(intValue); // } else if (value instanceof Float) { // float fValue = (Float) value; // textValue = new HSSFRichTextString( // String.valueOf(fValue)); // cell.setCellValue(textValue); // } else if (value instanceof Double) { // double dValue = (Double) value; // textValue = new HSSFRichTextString( // String.valueOf(dValue)); // cell.setCellValue(textValue); // } else if (value instanceof Long) { // long longValue = (Long) value; // cell.setCellValue(longValue); // } if (null == value) { value = ""; } 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[]) { // 有图片时,设置行高为60px; row.setHeightInPoints(60); // 设置图片所在列宽度为80px,注意这里单位的一个换算 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(ClientAnchor.AnchorType.MOVE_DONT_RESIZE); patriarch.createPicture(anchor, workbook.addPicture( bsValue, HSSFWorkbook.PICTURE_TYPE_JPEG)); } else { // 其它数据类型都当作字符串简单处理 textValue = value.toString(); } // 如果不是图片数据,就利用正则表达式判断textValue是否全部由数字组成 if (textValue != null) { Pattern p = Pattern.compile("^//d+(//.//d+)?$"); Matcher matcher = p.matcher(textValue); if (matcher.matches()) { // 是数字当作double处理 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) { e.printStackTrace(); } catch (NoSuchMethodException e) { e.printStackTrace(); } catch (IllegalArgumentException e) { e.printStackTrace(); } catch (IllegalAccessException e) { e.printStackTrace(); } catch (InvocationTargetException e) { e.printStackTrace(); } finally { // 清理资源 } } } try { workbook.write(out); } catch (IOException e) { e.printStackTrace(); } } public static void export2003(String imagesPath, String docsPath) { // 测试学生 ExcelExportUtil<Student> ex = new ExcelExportUtil<Student>(); String[] headers = { "学号", "姓名", "年龄", "性别", "出生日期" }; List<Student> dataset = new ArrayList<Student>(); dataset.add(new Student(10000001L, "张三", 20, true, new Date())); dataset.add(new Student(20000002L, "李四", 24, false, new Date())); dataset.add(new Student(30000003L, "王五", 22, true, new Date())); // 测试图书 ExcelExportUtil<Book> exBook = new ExcelExportUtil<Book>(); String[] headersBook = { "图书编号", "图书名称", "图书作者", "图书价格", "图书ISBN", "图书出版社", "封面图片" }; List<Book> datasetBook = new ArrayList<Book>(); try { BufferedInputStream bis = new BufferedInputStream( new FileInputStream(imagesPath)); byte[] buf = new byte[bis.available()]; while ((bis.read(buf)) != -1) { // } datasetBook.add(new Book(1, "jsp", "leno", 300.33f, "1234567", "清华出版社", buf)); datasetBook.add(new Book(2, "java编程思想", "brucl", 300.33f, "1234567", "阳光出版社", buf)); datasetBook.add(new Book(3, "DOM艺术", "lenotang", 300.33f, "1234567", "清华出版社", buf)); datasetBook.add(new Book(4, "c++经典", "leno", 400.33f, "1234567", "清华出版社", buf)); datasetBook.add(new Book(5, "c#入门", "leno", 300.33f, "1234567", "汤春秀出版社", buf)); OutputStream out = new FileOutputStream(docsPath + File.separator + Globals.EXPORT_STUDENT); OutputStream outBook = new FileOutputStream(docsPath + File.separator + Globals.EXPORT_BOOK); ex.exportExcel(headers, dataset, out); exBook.exportExcel(headersBook, datasetBook, outBook); out.close(); outBook.close(); // JOptionPane.showMessageDialog(null, "导出成功!"); } catch (FileNotFoundException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } } public static void export2007(String filePath) { try { // 输出流 OutputStream os = new FileOutputStream(filePath); // 工作区 XSSFWorkbook wb = new XSSFWorkbook(); XSSFSheet sheet = wb.createSheet(Globals.SHEETNAME); for (int i = 0; i < 1000; i++) { // 创建第一个sheet // 生成第一行 XSSFRow row = sheet.createRow(i); // 给这一行的第一列赋值 row.createCell(0).setCellValue("column" + i); // 给这一行的第一列赋值 row.createCell(1).setCellValue("column" + i); // System.out.println(i); } // 写文件 wb.write(os); // 关闭输出流 os.close(); } catch (Exception e) { e.printStackTrace(); } } }