导出效果如下，实现在网页弹出选择保存路径，可以合并单元格，设置字体信息，单元格行宽、列高。
private void exportExcel(String parentTitle, String sheetName,
String[] headers, String[] fields, Collection<T> dataset,
OutputStream out, String pattern, String date, int[] columnWidth) {
// 声明一个工作薄
HSSFWorkbook workbook = new HSSFWorkbook();
// 生成一个表格
HSSFSheet sheet = workbook.createSheet(sheetName);
// 设置表格默认列宽度为15个字节
// sheet.setDefaultColumnWidth((short) 18);
// 设置表格列宽，列宽计算公式为(int)((columnWidth+0.72)*256)
for (int i = 0; i < columnWidth.length; i++) {
sheet.setColumnWidth(i, (int) ((columnWidth[i] + 0.72) * 256));
}
// 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(parentTitle));
// 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("billz");
// 主标题
HSSFRow pTitleRow = sheet.createRow(0);
HSSFCell pTitleCell = pTitleRow.createCell(0);
pTitleCell.setCellStyle(getParentTitleStyle(workbook));
pTitleCell.setCellValue(new HSSFRichTextString(parentTitle));
// 跨第1行第1个到第2个单元格的操作为
CellRangeAddress rg = new CellRangeAddress(0, (short) 0, 0,
(short) (headers.length - 1));
sheet.addMergedRegion(rg);
pTitleRow.setHeightInPoints(35);// 目的是想把行高设置成35px
// end
// 显示时间行，第二行
HSSFRow dateRow = sheet.createRow(1);
sheet.addMergedRegion(new CellRangeAddress(1, 1, headers.length - 2,
headers.length - 1));
dateRow.setHeight((short) 400);
HSSFCell dateCell = dateRow.createCell(headers.length - 2);
dateCell.setCellStyle(getDateStyle(workbook));
dateCell.setCellValue(new HSSFRichTextString(date));
// 产生表格标题行
HSSFRow row = sheet.createRow(2);
row.setHeight((short) 0x279);
for (int i = 0; i < headers.length; i++) {
HSSFCell cell = row.createCell(i);
cell.setCellStyle(getTitleStyle(workbook));
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 = 2;
while (it.hasNext()) {
index++;
row = sheet.createRow(index);
row.setHeight((short) 512);
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
for (int i = 0; i < fields.length; i++) {
HSSFCell cell = row.createCell(i);
cell.setCellStyle(getValueStyle(workbook));
String fieldName = fields[i];
String getMethodName = "get"
+ fieldName.substring(0, 1).toUpperCase()
+ fieldName.substring(1);
try {
Method getMethod = t.getClass().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 = "是";
if (!bValue) {
textValue = "否";
}
} else if (value instanceof Date) {
Date date1 = (Date) value;
SimpleDateFormat sdf = new SimpleDateFormat(pattern);
textValue = sdf.format(date1);
} 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 if (value instanceof Long) { // long类型的时间字符串转为固定格式（yy/MM/dd
// hh:mm）String字符串
String dateStr = String.valueOf(value);
String year = dateStr.substring(0, 4) + "/";
String month = dateStr.substring(4, 6) + "/";
String day = dateStr.substring(6, 8) + " ";
String hour = dateStr.substring(8, 10) + ":";
String minute = dateStr.substring(10, 12);
textValue = year + month + day + hour + minute;
} else {
// 其它数据类型都当作字符串简单处理
textValue = value != null ? 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 (Exception e) {
e.printStackTrace();
} finally {
// 清理资源
}
}
}
try {
workbook.write(out);
} catch (IOException e) {
e.printStackTrace();
}
}
更多详细信息请联系作者。。。。。。。
