将数据库数据导出至Excel表格

将数据库数据导出至Excel表格

public void upExcel(String fileName,HttpServletRequest request,HttpServletResponse response){
OutputStream outputStream = null;
//创建输出文件目录
String excelPath = "E:\\file/" + fileName + ".xls";
try {
//创建输出流
outputStream = new FileOutputStream(excelPath);
//创建文件
HSSFWorkbook workbook = new HSSFWorkbook();
//创建工作表
HSSFSheet sheet = workbook.createSheet(fileName);
//获取表中字段集合
List<Map> cols = this.proRequireService.findCols();//此处调用service层方法
//创建表头
HSSFRow row = sheet.createRow(0);
//合并单元格
CellRangeAddress cellRangeAddress = new CellRangeAddress(0,0,0,cols.size()-1);//第一行第一列分别记作0,0，表示将第0行到第0行，第0列到总列数减一列处合并
//将合并的单元格放入文件中并写入数据（将文件名放进表头处）
sheet.addMergedRegion(cellRangeAddress);
row.createCell(0).setCellValue(fileName);
//创见表头
row = sheet.createRow(1);
ArrayList<String> cnlist = new ArrayList();
HashMap cn_en_map = new HashMap();
//将数据写入表头
for (Map map : cols) {
cnlist.add(map.get("COLUMN_NAME").toString());
cn_en_map.put(map.get("COLUMN_NAME").toString(),
map.get("COMMENTS").toString());
}
for (int i = 0; i < cnlist.size(); i++) {
System.out.println(cnlist.get(i).toString());
HSSFCell cell = row.createCell(i);
cell.setCellValue(cn_en_map.get(cnlist.get(i).toString()).toString());
}
//给表中写数据
List<Map> datas = this.proRequireService.getDatas();
for (int i = 0; i < datas.size(); i++) {
Map data = datas.get(i);
row = sheet.createRow(i + 2);
for (int j = 0; j < cnlist.size(); j++) {
row.createCell(j).setCellValue(data.get(cnlist.get(j).toString())==null?"":data.get(cnlist.get(j).toString()).toString());
}
}
workbook.write(outputStream);
System.out.println("end");
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}finally{
try {
outputStream.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}