- public class ExportExcel<T> {
- public void exportExcel(Collection<T> dataset, OutputStream out) {
- exportExcel("测试 POI 导出 EXCEL 文档", null, dataset, out, "yyyy-MM-dd");
- }
- public void exportExcel(String[] headers, Collection<T> dataset, OutputStream out) {
- exportExcel("测试 POI 导出 EXCEL 文档", headers, dataset, out, "yyyy-MM-dd");
- }
- public void exportExcel(String[] headers, Collection<T> dataset, OutputStream out, String pattern) {
- exportExcel("测试 POI 导出 EXCEL 文档", 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(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);
- // 生成一个字体
- HSSFFont font = workbook.createFont();
- font.setColor(HSSFColor.VIOLET.index);
- font.setFontHeightInPoints((short) 12);
- font.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD);
- // 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(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);
- // 生成另一个字体
- HSSFFont font2 = workbook.createFont();
- font2.setBoldweight(HSSFFont.BOLDWEIGHT_NORMAL);
- // 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 (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(2);
- 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 main(String[] args) {
- // 测试学生
- ExportExcel<Student> ex = new ExportExcel<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(10000001, "张三", 20, true, new Date()));
- dataset.add(new Student(20000002, "李四", 24, false, new Date()));
- dataset.add(new Student(30000003, "王五", 22, true, new Date()));
- // 测试图书
- ExportExcel<Book> ex2 = new ExportExcel<Book>();
- String[] headers2 = { "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> dataset2 = new ArrayList<Book>();
- try {
- BufferedInputStream bis = new BufferedInputStream(new FileInputStream("D://USER//Desktop//1.jpg"));
- byte[] buf = new byte[bis.available()];
- while ((bis.read(buf)) != -1) {
- //
- }
dataset2.add(new Book(1, "jsp", "leno", 300.33f, "1234567", "清华出版社", buf));
dataset2.add(new Book(2, "java 编程思想", "brucl", 300.33f, "1234567", "阳光出版社", buf));
dataset2.add(new Book(3, "DOM 艺术", "lenotang", 300.33f, "1234567", "清华出版社", buf));
dataset2.add(new Book(4, "c++ 经典", "leno", 400.33f, "1234567", "清华出版社", buf));
- dataset2.add(new Book(5, "c# 入门", "leno", 300.33f, "1234567", "汤春秀出版社", buf));
- OutputStream out = new FileOutputStream("E://a.xls");
- OutputStream out2 = new FileOutputStream("E://b.xls");
- ex.exportExcel(headers, dataset, out);
- ex2.exportExcel(headers2, dataset2, out2);
- out.close();
- out2.close();
- JOptionPane.showMessageDialog(null, "导出成功!");
- System.out.println("excel 导出成功!");
- } catch (FileNotFoundException e) {
- e.printStackTrace();
- } catch (IOException e) {
- e.printStackTrace();
- }
- }
- }
来源: https://www.cnblogs.com/fixzd/p/8982739.html