public class ExcelUtil {
private static final String EXCEL_XLS = "xls";
private static final String EXCEL_XLSX = "xlsx";
public static int DEFAULT_COLOUMN_WIDTH = 20;
/**
* 将excel文件解析为list
*
* @param file
* @return List<List<Object>>
* @throws IOException
*/
public static List<Map<String, String>> getListByExcel(MultipartFile file) throws Exception {
List<Map<String, String>> list = new ArrayList<Map<String, String>>();
InputStream in = file.getInputStream();
// 创建Excel工作薄
Workbook work = getWorkbook(in, file.getOriginalFilename());
if (null == work) {
throw new Exception("创建Excel工作薄为空！");
}
Sheet sheet = null;
Row row = null;
Cell cell = null;
// 遍历Excel中所有的sheet
for (int i = 0; i < work.getNumberOfSheets(); i++) {
sheet = work.getSheetAt(i);
if (sheet == null) {
continue;
}
// 遍历当前sheet中的所有行
for (int j = sheet.getFirstRowNum()+1; j <= sheet.getLastRowNum(); j++) {
row = sheet.getRow(j);
if (row == null) {
continue;
}
// 遍历所有的列
Map<String, String> map = new HashMap<String, String>();
for (int y = row.getFirstCellNum(); y < row.getLastCellNum(); y++) {
cell = row.getCell(y);
if(cell != null) {
if(cell.getCellType()==0) {
if(HSSFDateUtil.isCellDateFormatted(cell)){
SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM-dd");
map.put(y+"", sdf.format(cell.getDateCellValue()));
}else {
DecimalFormat df = new DecimalFormat("########");
map.put(y+"", df.format(cell.getNumericCellValue()));
}
}else {
map.put(y+"", cell.getRichStringCellValue().getString());
}
}else {
map.put(y+"", null);
}
}
list.add(map);
}
}
in.close();
return list;
}
/**
* 描述：根据文件后缀，自适应上传文件的版本
*
* @param inStr,fileName
* @return
* @throws Exception
*/
private static Workbook getWorkbook(InputStream inStr, String fileName) throws Exception {
Workbook wb = null;
String fileType = fileName.substring(fileName.lastIndexOf("."));
if (("."+EXCEL_XLS).equals(fileType)) {
wb = new HSSFWorkbook(inStr); // 2003-
}else if(("."+EXCEL_XLSX).equals(fileType)) {
wb = new XSSFWorkbook(inStr);
}else {
throw new Exception("解析的文件格式有误！");
}
return wb;
}
public static void Excel2007AboveOperate(String filePath) throws IOException {
XSSFWorkbook workbook1 = new XSSFWorkbook(new FileInputStream(new File(filePath)));
SXSSFWorkbook sxssfWorkbook = new SXSSFWorkbook(workbook1, 100);
Sheet first = sxssfWorkbook.getSheetAt(0);
for (int i = 0; i < 100000; i++) {
Row row = first.createRow(i);
for (int j = 0; j < 11; j++) {
if(i == 0) {
// 首行
row.createCell(j).setCellValue("column" + j);
} else {
// 数据
if (j == 0) {
CellUtil.createCell(row, j, String.valueOf(i));
} else
CellUtil.createCell(row, j, String.valueOf(Math.random()));
}
}
}
FileOutputStream out = new FileOutputStream("workbook.xlsx");
sxssfWorkbook.write(out);
out.close();
}
/**
* 导出到Excel文件
*
* @param title Excel标题
* @param headMap 列名与汉字map集合
* @param properties 列名集合数组
* @param list 报表数据
* @param out 输出文件流
*/
public static void export(String title, Map<String, String> headMap, String[] properties, List<Map<String, Object>> list, OutputStream out) {
// 声明一个工作薄
SXSSFWorkbook workbook = new SXSSFWorkbook(1000);// 缓存
workbook.setCompressTempFiles(true);
// 表头样式
CellStyle titleStyle = workbook.createCellStyle();
titleStyle.setAlignment(HSSFCellStyle.ALIGN_CENTER);
Font titleFont = workbook.createFont();
titleFont.setFontHeightInPoints((short) 15);
titleFont.setBoldweight((short) 600);
titleStyle.setFont(titleFont);
// 列头样式
CellStyle headerStyle = workbook.createCellStyle();
headerStyle.setFillPattern(HSSFCellStyle.NO_FILL);// SOLID_FOREGROUND
// headerStyle.setFillForegroundColor(HSSFColor.WHITE.index);
headerStyle.setBorderBottom(HSSFCellStyle.BORDER_THIN);
headerStyle.setBorderLeft(HSSFCellStyle.BORDER_THIN);
headerStyle.setBorderRight(HSSFCellStyle.BORDER_THIN);
headerStyle.setBorderTop(HSSFCellStyle.BORDER_THIN);
headerStyle.setAlignment(HSSFCellStyle.ALIGN_CENTER);
Font headerFont = workbook.createFont();
headerFont.setFontHeightInPoints((short) 12);
headerFont.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD);
headerStyle.setFont(headerFont);
// 单元格样式
CellStyle cellStyle = workbook.createCellStyle();
cellStyle.setFillPattern(HSSFCellStyle.NO_FILL);
cellStyle.setBorderBottom(HSSFCellStyle.BORDER_THIN);
cellStyle.setBorderLeft(HSSFCellStyle.BORDER_THIN);
cellStyle.setBorderRight(HSSFCellStyle.BORDER_THIN);
cellStyle.setBorderTop(HSSFCellStyle.BORDER_THIN);
cellStyle.setAlignment(HSSFCellStyle.ALIGN_CENTER);
cellStyle.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER);
Font cellFont = workbook.createFont();
cellFont.setBoldweight(HSSFFont.BOLDWEIGHT_NORMAL);
cellStyle.setFont(cellFont);
// 生成一个(带标题)表格
SXSSFSheet sheet = (SXSSFSheet) workbook.createSheet();
// 设置列宽
int minBytes = DEFAULT_COLOUMN_WIDTH;
int[] arrColWidth = new int[headMap.size()];
// 产生表格标题行,以及设置列宽
String[] headers = new String[headMap.size()];
for (int i = 0; i < headers.length; i++) {
headers[i] = headMap.get(properties[i]);
}
for (int i = 0; i < headers.length; i++) {
int bytes = properties[i].getBytes().length;
arrColWidth[i] = bytes < minBytes ? minBytes : bytes;
sheet.setColumnWidth(i, arrColWidth[i] * 256);
}
// 遍历集合数据，产生数据行
Map<String, Object> sumMap = new HashMap<String, Object>();
int rowIndex = 0;
for (Map<String, Object> map : list) {
if (rowIndex == 0) {
SXSSFRow titleRow = (SXSSFRow) sheet.createRow(0);// 表头 rowIndex=0
titleRow.createCell(0).setCellValue(title);
titleRow.getCell(0).setCellStyle(titleStyle);
sheet.addMergedRegion(new CellRangeAddress(0, 0, 0, headMap.size() - 1));
SXSSFRow headerRow = (SXSSFRow) sheet.createRow(1); // 列头 rowIndex =1
for (int i = 0; i < headers.length; i++) {
headerRow.createCell(i).setCellValue(headers[i]);
headerRow.getCell(i).setCellStyle(headerStyle);
}
rowIndex = 2;// 数据内容从 rowIndex=2开始
}
SXSSFRow dataRow = (SXSSFRow) sheet.createRow(rowIndex);
for (int i = 0; i < properties.length; i++) {
SXSSFCell newCell = (SXSSFCell) dataRow.createCell(i);
Object objCell = map.get(properties[i]);
String cellValue = "";
if (objCell instanceof Date) {
SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd");
cellValue = format.format(objCell);
} else if (objCell == null) {
cellValue = "";
} else {
cellValue = objCell.toString();
}
newCell.setCellValue(cellValue);
newCell.setCellStyle(cellStyle);
}
rowIndex++;
}
try {
workbook.write(out);
workbook.dispose();
} catch (IOException e) {
e.printStackTrace();
}
}
}
Excel文件导入转成List＜Map＜String,String＞＞类型格式
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转载自blog.csdn.net/weixin_37999518/article/details/110450840
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