ExcelExport 代码导出（大数据量导出） - 风的专栏 - CSDN博客
public class ExcelExport {
public static void main(String\[\] args) throws Exception {
String sheetName = "测试Excel格式";
String sheetTitle = "测试Excel格式";
List<String> columnNames = new LinkedList<>();
columnNames.add("日期-String");
columnNames.add("日期-Date");
columnNames.add("时间戳-Long");
columnNames.add("客户编码");
columnNames.add("整数");
columnNames.add("带小数的正数");
ExportExcel2007 exportExcel2007 = new ExportExcel2007();
exportExcel2007.writeExcelTitle("E:\\\temp", "a", sheetName, columnNames, sheetTitle);
for (int j = 0; j < 2; j++) {
List<List<Object>> objects = new LinkedList<>();
for (int i = 0; i < 1000; i++) {
List<Object> dataA = new LinkedList<>();
dataA.add("2016-09-05 17:27:25");
dataA.add(new Date(1451036631012L));
dataA.add(1451036631012L);
dataA.add("000628");
dataA.add(i);
dataA.add(1.323 \+ i);
objects.add(dataA);
}
try {
exportExcel2007.writeExcelData("E:\\\temp", "a", sheetName, objects);
} catch (Exception e) {
e.printStackTrace();
}
objects.clear();
}
exportExcel2007.dispose();
}
}
/**
* Excel 相关操作类(大数据量写入但受Excel数据行数限制) * 先写入Excel标题(writeExcelTitle)，再写入数据(writeExcelData)，最后释放资源(dispose) */ public class ExportExcel2007 {
//默认列宽度private final int DEFAULT_COLUMN_SIZE = 30;
//刷新写入硬盘数据阀值private final int flushRows = 1000;
//声明一个模板工作薄(写入流式数据)private Workbook writeDataWorkBook;
//样式列表private Map<String, CellStyle> cellStyleMap;
//Excel当前数据行数(将要写入数据的索引数)private int currentRowNum = 0;
//数据输出流private OutputStream outputStream;
/*** 断言Excel文件写入之前的条件 * * @param directory 目录
* @param fileName 文件名
* @return file
* @throws IOException
*/ private File assertFile(String directory, String fileName) throws IOException {
File tmpFile = new File(directory + File.separator \+ fileName + ".xlsx");
if (tmpFile.exists()) {
if (tmpFile.isDirectory()) {
throw new IOException("File '" \+ tmpFile + "' exists but is a directory");
}
if (!tmpFile.canWrite()) {
throw new IOException("File '" \+ tmpFile + "' cannot be written to");
}
} else {
File parent = tmpFile.getParentFile();
if (parent != null) {
if (!parent.mkdirs() && !parent.isDirectory()) {
throw new IOException("Directory '" \+ parent + "' could not be created");
}
}
}
return tmpFile;
}
/*** 日期转化为字符串,格式为yyyy-MM-dd HH:mm:ss */ private String getCnDate(Date date) {
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
return sdf.format(date);
}
/*** Excel 导出，POI实现，先写入Excel标题，与writeExcelData配合使用 * 先使用writeExcelTitle再使用writeExcelData * * @param directory 目录
* @param fileName 文件名
* @param sheetName sheetName
* @param columnNames 列名集合
* @param sheetTitle 表格标题
*/ public void writeExcelTitle(String directory, String fileName, String sheetName, List<String> columnNames,
String sheetTitle) throws Exception {
File tmpFile = assertFile(directory, fileName);
exportExcelTitle(tmpFile, sheetName, columnNames, sheetTitle);
loadTplWorkbook(tmpFile);
}
/*** Excel 导出，POI实现，写入Excel数据行列，与writeExcelTitle配合使用 * 先使用writeExcelTitle再使用writeExcelData * * @param directory 目录
* @param fileName 文件名
* @param sheetName sheetName
* @param objects 数据信息
*/ public void writeExcelData(String directory, String fileName, String sheetName, List<List<Object>> objects)
throws Exception {
File tmpFile = assertFile(directory, fileName);
outputStream = new FileOutputStream(tmpFile);
exportExcelData(sheetName, objects);
}
/*** 释放资源 */ public void dispose() throws Exception {
try {
if (writeDataWorkBook != null) {
writeDataWorkBook.write(outputStream);
}
if (outputStream != null) {
outputStream.flush();
outputStream.close();
}
if (cellStyleMap != null) {
cellStyleMap.clear();
}
cellStyleMap = null;
outputStream = null;
writeDataWorkBook = null;
} catch (IOException e) {
throw new Exception(e);
}
}
/*** 导出字符串数据 * * @param file 文件名
* @param columnNames 表头
* @param sheetTitle sheet页Title
*/ private void exportExcelTitle(File file, String sheetName, List<String> columnNames,
String sheetTitle) throws Exception {
Workbook tplWorkBook = new XSSFWorkbook();
Map<String, CellStyle> cellStyleMap = styleMap(tplWorkBook);
// 表头样式CellStyle headStyle = cellStyleMap.get("head");
// 生成一个表格Sheet sheet = tplWorkBook.getSheet(sheetName);
if (sheet == null) {
sheet = tplWorkBook.createSheet(sheetName);
}
//最新Excel列索引,从0开始//int lastRowIndex = sheet.getLastRowNum(); // 设置表格默认列宽度 sheet.setDefaultColumnWidth(DEFAULT_COLUMN_SIZE);
// 合并单元格sheet.addMergedRegion(new CellRangeAddress(currentRowNum, currentRowNum, 0, columnNames.size() - 1));
// 产生表格标题行Row rowMerged = sheet.createRow(currentRowNum);
Cell mergedCell = rowMerged.createCell(0);
mergedCell.setCellStyle(headStyle);
mergedCell.setCellValue(new XSSFRichTextString(sheetTitle));
//写入成功一行数据递增行数currentRowNum = currentRowNum + 1;
// 产生表格表头列标题行Row row = sheet.createRow(currentRowNum);
for (int i = 0; i < columnNames.size(); i++) {
Cell cell = row.createCell(i);
cell.setCellStyle(headStyle);
RichTextString text = new XSSFRichTextString(columnNames.get(i));
cell.setCellValue(text);
}
//写入成功一行数据递增行数currentRowNum = currentRowNum + 1;
try {
OutputStream ops = new FileOutputStream(file);
tplWorkBook.write(ops);
ops.flush();
ops.close();
} catch (IOException e) {
throw new Exception(e);
}
}
/*** 加载模板文件 */ private void loadTplWorkbook(File file) throws Exception {
try {
XSSFWorkbook tplWorkBook = new XSSFWorkbook(new FileInputStream(file));
writeDataWorkBook = new SXSSFWorkbook(tplWorkBook, flushRows);
cellStyleMap = styleMap(writeDataWorkBook);
} catch (IOException e) {
throw new Exception("Excel模板文件不存在");
}
}
/*** 导出字符串数据 * * @param objects 目标数据
*/ private void exportExcelData(String sheetName, List<List<Object>> objects) throws Exception, IOException {
// 正文样式CellStyle contentStyle = cellStyleMap.get("content");
//正文整数样式CellStyle contentIntegerStyle = cellStyleMap.get("integer");
//正文带小数整数样式CellStyle contentDoubleStyle = cellStyleMap.get("double");
// 生成一个表格Sheet sheet = writeDataWorkBook.getSheet(sheetName);
if (sheet == null) {
throw new Exception("读取Excel模板错误");
}
// 设置表格默认列宽度sheet.setDefaultColumnWidth(DEFAULT_COLUMN_SIZE);
// 遍历集合数据,产生数据行,前两行为标题行与表头行for (List<Object> dataRow : objects) {
Row row = sheet.createRow(currentRowNum);
for (int j = 0; j < dataRow.size(); j++) {
Cell contentCell = row.createCell(j);
Object dataObject = dataRow.get(j);
if (dataObject != null) {
if (dataObject instanceof Integer) {
contentCell.setCellStyle(contentIntegerStyle);
contentCell.setCellValue(Integer.parseInt(dataObject.toString()));
} else if (dataObject instanceof Double) {
contentCell.setCellStyle(contentDoubleStyle);
contentCell.setCellValue(Double.parseDouble(dataObject.toString()));
} else if (dataObject instanceof Long && dataObject.toString().length() == 13) {
contentCell.setCellStyle(contentStyle);
contentCell.setCellValue(getCnDate(new Date(Long.parseLong(dataObject.toString()))));
} else if (dataObject instanceof Date) {
contentCell.setCellStyle(contentStyle);
contentCell.setCellValue(getCnDate((Date) dataObject));
} else {
contentCell.setCellStyle(contentStyle);
contentCell.setCellValue(dataObject.toString());
}
} else {
contentCell.setCellStyle(contentStyle);
// 设置单元格内容为字符型contentCell.setCellValue("");
}
}
//写入成功一行数据递增行数currentRowNum = currentRowNum + 1;
}
try {
((SXSSFSheet) sheet).flushRows(flushRows);
} catch (IOException e) {
throw new Exception(e);
}
}
/*** 创建单元格表头样式 * * @param workbook 工作薄
*/ private CellStyle createCellHeadStyle(Workbook workbook) {
CellStyle style = workbook.createCellStyle();
// 设置边框样式style.setBorderBottom(XSSFCellStyle.BORDER_THIN);
style.setBorderLeft(XSSFCellStyle.BORDER_THIN);
style.setBorderRight(XSSFCellStyle.BORDER_THIN);
style.setBorderTop(XSSFCellStyle.BORDER_THIN);
//设置对齐样式style.setAlignment(XSSFCellStyle.ALIGN_CENTER);
// 生成字体Font font = workbook.createFont();
// 表头样式style.setFillPattern(XSSFCellStyle.SOLID_FOREGROUND);
style.setFillForegroundColor(HSSFColor.GREY\_25\_PERCENT.index);
font.setFontHeightInPoints((short) 12);
font.setBoldweight(XSSFFont.BOLDWEIGHT_BOLD);
// 把字体应用到当前的样式style.setFont(font);
return style;
}
/*** 创建单元格正文样式 * * @param workbook 工作薄
*/ private CellStyle createCellContentStyle(Workbook workbook) {
CellStyle style = workbook.createCellStyle();
// 设置边框样式style.setBorderBottom(XSSFCellStyle.BORDER_THIN);
style.setBorderLeft(XSSFCellStyle.BORDER_THIN);
style.setBorderRight(XSSFCellStyle.BORDER_THIN);
style.setBorderTop(XSSFCellStyle.BORDER_THIN);
//设置对齐样式style.setAlignment(XSSFCellStyle.ALIGN_CENTER);
// 生成字体Font font = workbook.createFont();
// 正文样式style.setFillPattern(XSSFCellStyle.NO_FILL);
style.setVerticalAlignment(XSSFCellStyle.VERTICAL_CENTER);
font.setBoldweight(XSSFFont.BOLDWEIGHT_NORMAL);
// 把字体应用到当前的样式style.setFont(font);
return style;
}
/*** 单元格样式(Integer)列表 */ private CellStyle createCellContent4IntegerStyle(Workbook workbook) {
CellStyle style = workbook.createCellStyle();
// 设置边框样式style.setBorderBottom(XSSFCellStyle.BORDER_THIN);
style.setBorderLeft(XSSFCellStyle.BORDER_THIN);
style.setBorderRight(XSSFCellStyle.BORDER_THIN);
style.setBorderTop(XSSFCellStyle.BORDER_THIN);
//设置对齐样式style.setAlignment(XSSFCellStyle.ALIGN_CENTER);
// 生成字体Font font = workbook.createFont();
// 正文样式style.setFillPattern(XSSFCellStyle.NO_FILL);
style.setVerticalAlignment(XSSFCellStyle.VERTICAL_CENTER);
font.setBoldweight(XSSFFont.BOLDWEIGHT_NORMAL);
// 把字体应用到当前的样式style.setFont(font);
style.setDataFormat(HSSFDataFormat.getBuiltinFormat("#,##0"));//数据格式只显示整数return style;
}
/*** 单元格样式(Double)列表 */ private CellStyle createCellContent4DoubleStyle(Workbook workbook) {
CellStyle style = workbook.createCellStyle();
// 设置边框样式style.setBorderBottom(XSSFCellStyle.BORDER_THIN);
style.setBorderLeft(XSSFCellStyle.BORDER_THIN);
style.setBorderRight(XSSFCellStyle.BORDER_THIN);
style.setBorderTop(XSSFCellStyle.BORDER_THIN);
//设置对齐样式style.setAlignment(XSSFCellStyle.ALIGN_CENTER);
// 生成字体Font font = workbook.createFont();
// 正文样式style.setFillPattern(XSSFCellStyle.NO_FILL);
style.setVerticalAlignment(XSSFCellStyle.VERTICAL_CENTER);
font.setBoldweight(XSSFFont.BOLDWEIGHT_NORMAL);
// 把字体应用到当前的样式style.setFont(font);
style.setDataFormat(HSSFDataFormat.getBuiltinFormat("#,##0.00"));//保留两位小数点return style;
}
/*** 单元格样式列表 */ private Map<String, CellStyle> styleMap(Workbook workbook) {
Map<String, CellStyle> styleMap = new LinkedHashMap<>();
styleMap.put("head", createCellHeadStyle(workbook));
styleMap.put("content", createCellContentStyle(workbook));
styleMap.put("integer", createCellContent4IntegerStyle(workbook));
styleMap.put("double", createCellContent4DoubleStyle(workbook));
return styleMap;
}
}
Original url: Access
Created at: 2019-10-30 12:49:34
Category: default
Tags: none
未标明原创文章均为采集，版权归作者所有，转载无需和我联系，请注明原出处，南摩阿彌陀佛，知识，不只知道，要得到
最新评论