使用POI导入数据到Excel数据量过大报错解决方案
导出excel报不能超过4000行错误
POI操作Excel中，导出的数据不是很大时，则不会有问题，而数据很多或者比较多时，就会报以下的错误，是由于cell styles太多create造成，故一般可以把cellstyle设置放到循环外面 报错如下：
java.lang.IllegalStateException: The maximum number of cell styles was exceeded. You can define up to 4000 styles in a .xls workbook
at org.apache.poi.hssf.usermodel.HSSFWorkbook.createCellStyle(HSSFWorkbook.java:1162)
错误示例
for (int i = 0; i < 10000; i++) {
Row row = sheet.createRow(i);
Cell cell = row.createCell((short) 0);
CellStyle style = workbook.createCellStyle();
Font font = workbook.createFont();
font.setBoldweight(Font.BOLDWEIGHT_BOLD);
style.setFont(font);
cell.setCellStyle(style);
} 改正后正确代码
CellStyle style = workbook.createCellStyle();
Font font = workbook.createFont();
font.setBoldweight(Font.BOLDWEIGHT_BOLD);
style.setFont(font);
for (int i = 0; i < 10000; i++) {
Row row = sheet.createRow(i);
Cell cell = row.createCell((short) 0);
cell.setCellStyle(style);
} 以下是生成excel核心代码：
public static void export( ExcelBean excelBean, HttpServletResponse response) throws IOException {
String filename = excelBean.getName();
filename = new String(filename.replaceAll("\\s|;", "").getBytes("gbk"), "ISO8859-1");
response.setContentType("application/octet-stream;charset=utf-8");
response.setCharacterEncoding("utf-8");
response.setContentType("application/vnd.ms-excel");
response.setHeader("Content-disposition", "attachment;filename=" + filename);
OutputStream outputStream = response.getOutputStream();
createExcel(excelBean, outputStream);
outputStream.flush();
outputStream.close();
}public static void createExcel(ExcelBean excelBean, OutputStream outputStream) throws IOException{
// 声明一个工作薄
HSSFWorkbook wb = new HSSFWorkbook();
// 生成一个表格
HSSFSheet sheet = wb.createSheet(excelBean.getSheetName());
HSSFRow row0 = sheet.createRow(0);
int descIndexBegin = 9;
// int descIndexEnd = 12;
HSSFRow row9 = sheet.createRow(descIndexBegin);
HSSFRow row = sheet.createRow(1);
row.setHeightInPoints(25.0f);//行高度：25像素
//设置样式
HSSFCellStyle style = wb.createCellStyle();
HSSFCellStyle descStyle = wb.createCellStyle();
// 设置水平居中样式
setAlignCenter(style);
// 设置标题栏样式
setTitleStyle(wb,style);
if(excelBean.isHeadBold()){
HSSFFont headfont = wb.createFont();
headfont.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD);
style.setFont(headfont);
}
HSSFCell cell;
ExcelTitle[] titles = excelBean.getTitles();
//==========设置顶部标题(合并第一行多个列)==========
if(titles.length>=2){
sheet.addMergedRegion(new CellRangeAddress(0,0,0,titles.length-1));//起始行，结束行，起始列，结束列
}
cell = row0.createCell(0);
String topTitle = excelBean.getName();
String titleName = topTitle.substring(0,topTitle.lastIndexOf("."));
cell.setCellValue(titleName);//第一行标题
cell.setCellStyle(style);
setTopTitleStyle(wb,cell,titleName);
//==========设置顶部标题(合并第一行多个列)==========
//====================设置说明==========begin==========
String desc = excelBean.getDescription();
if(StringUtils.isNoneBlank(desc)){
if(titles.length>=2){
sheet.addMergedRegion(new CellRangeAddress(descIndexBegin,descIndexBegin,0,titles.length-1));//firstRow, lastRow, firstCol, lastCol
}
HSSFCell descCell = row9.createCell(0);
descCell.setCellValue("**说明："+desc+"\r\n 请删除说明文字所在的行后再上传");//第一行标题
// setAlignLeft(style);
setAlignLeftAndTop(descCell,descStyle);//设置合并后的左上对齐方式
}
//====================设置说明==========end==========
//====================设置第二标题====================
for(int i=0; i < titles.length; i++){
ExcelTitle title = titles[i];
cell= row.createCell(i);
//如果标题中包含'必填、唯一字段'，则设置为红色
String titleValue = title.getValue();
int beginIndex = titleValue.indexOf("(");
int endIndex = titleValue.indexOf(")");
String subTitle = titleValue.substring(beginIndex,endIndex);
if(subTitle.contains("必填") || subTitle.contains("唯一字段")){
HSSFRichTextString ts= new HSSFRichTextString(titleValue);
HSSFFont font = wb.createFont();
font.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD);
font.setColor(HSSFColor.RED.index);
font.setFontHeightInPoints((short) 14);// 设置字体大小
HSSFFont font2 = wb.createFont();
font2.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD);
font2.setFontHeightInPoints((short) 14);// 设置字体大小
ts.applyFont(0,beginIndex,font2);//普通字体
ts.applyFont(beginIndex,endIndex+1,font);//红色字体
cell.setCellValue(ts);
}else{
cell.setCellValue(titleValue);
}
cell.setCellStyle(style);
int columnWidth = title.getWidth() > 0 ? title.getWidth() : excelBean.getColumnWidth();
sheet.setColumnWidth(i, getColWidth(columnWidth));
}
//====================设置第二行标题====================
//====================设置tips:example====================
int rowIndex = 2;
int rowHeight = excelBean.getRowHeight();
HSSFPatriarch patriarch = sheet.createDrawingPatriarch();
HSSFCellStyle cellStyle = wb.createCellStyle();
for(String[] data : excelBean.getDataList()){
row = sheet.createRow(rowIndex ++ );
if(rowHeight > 0){
row.setHeight((short) getRowHeight(rowHeight));
}
else{
rowHeight = 18;
}
for(int j=0; j 0 ? titles[j].getWidth() : excelBean.getColumnWidth();
insertImage(wb, patriarch, value, rowHeight, columnWidth, (short)(j), rowIndex);
}
else{
setLink(wb, cell, value);
}
}else{*/
cell.setCellValue(value);
cellStyle.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER);
cell.setCellStyle(cellStyle);
/* }*/
}
}
for (String[] tipsList : excelBean.getTipsList()) {
row = sheet.getRow(1);//在第一行设置批注
for(int j=0; j