- public class ExportExcel<T> {
- private HSSFWorkbook workbook;
- public ExportExcel() {
- this(new HSSFWorkbook());
- }
- public ExportExcel(HSSFWorkbook workbook) {
- this.workbook = workbook;
- }
- 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);
- }
- public void exportExcel(String title, String[] headers, Collection<T> dataset, OutputStream out, String pattern) {
- // 生成一个表格
- HSSFSheet sheet = workbook.createSheet(title);
- // 生成数据标题和数据行样式
- HSSFCellStyle rowTirtleStyle = getRowTitleStyle();
- HSSFCellStyle rowDataStyle = getRowDataStyle();
- // 创建数据标题和数据行
- createRowTitle(headers, sheet, rowTirtleStyle);
- createRowData(dataset, pattern, sheet, rowDataStyle);
- // 写入流
- writeExecl(out);
- }
- /**
- * Description: 写入到 OutputStream
- */
- private void writeExecl(OutputStream out) {
- try {
- workbook.write(out);
- } catch (IOException e) {
- e.printStackTrace();
- }
- }
- /**
- * Description: 产生数据行
- */
- private void createRowData(Collection<T> dataset, String pattern, HSSFSheet sheet, HSSFCellStyle rowDataStyle) {
- // 遍历集合数据, 产生数据行
- Iterator<T> it = dataset.iterator();
- int index = 0;
- while (it.hasNext()) {
- index++;
- HSSFRow 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 (int i = 0; i < fields.length; i++) {
- HSSFCell cell = row.createCell(i);
- cell.setCellStyle(rowDataStyle);
- 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 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 {
- // 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
- }
- }
- }
- }
- /**
- * Description: 产生表格标题行
- */
- private void createRowTitle(String[] headers, HSSFSheet sheet, HSSFCellStyle rowTirtleStyle) {
- HSSFRow row = sheet.createRow(0);
- for (int i = 0; i < headers.length; i++) {
- HSSFCell cell = row.createCell(i);
- cell.setCellStyle(rowTirtleStyle);
- HSSFRichTextString text = new HSSFRichTextString(headers[i]);
- cell.setCellValue(text);
- }
- }
- /**
- * Description: 生成数据标题样式
- */
- private HSSFCellStyle getRowTitleStyle() {
- 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);
- return style;
- }
- /**
- * Description: 生成数据行样式
- */
- private HSSFCellStyle getRowDataStyle() {
- 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);
- style.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER);
- // 生成另一个字体
- HSSFFont font = workbook.createFont();
- font.setBoldweight(HSSFFont.BOLDWEIGHT_NORMAL);
- style.setFont(font);
- return style;
- }
- }
来源: https://www.cnblogs.com/fixzd/p/9059994.html