POI生成Excel及下载

输出excle到指定目录

HSSFWorkbook workbook = new HSSFWorkbook();
HSSFSheet currSheet = workbook.createSheet("CommonQueryData");
HSSFRow row=currSheet.createRow(1);
HSSFCell cell= row.createCell(0);
cell.setCellValue("1");
FileOutputStream outputStream= new FileOutputStream("d://abc.xls");
workbook.write(outputStream);
outputStream.flush();
outputStream.close();

//把workbook的内容输出到指定文件

把数据写到excel文件输出到指定路径后可以用于测试，查看自己生成的workbook内容是否正确。

window.open(url, 'download'); //导出

下载excel

public static void createExcelFileCommonQuery(List<Map<String, Object>> resultList, HttpServletResponse response, Map<String, String> columnsMap,Map<String, String> paramMap ) throws BusinessException{

HSSFWorkbook workbook = createExcelCommonQuery(resultList,columnsMap);
response.setCharacterEncoding("UTF-8");
response.setContentType("application/vnd.ms-excel");
OutputStream os=null;
String fileName=paramMap.get("fileName");

response.setHeader("Content-disposition","attachment; filename=" + URLEncoder.encode(fileName,"UTF-8"));
os = response.getOutputStream();
workbook.write(os);
os.flush();
os.close();

}

poi生成excel，

/****
* 通用查询导出
* @param resultList
*/
private static HSSFWorkbook createExcelCommonQuery(List<Map<String, Object>> excelList,Map<String,String> columnsMap){

/**
columnsMap:
key value
name 姓名(表格第一行标题行)
sex  男
addr 住址
**/
HSSFWorkbook workbook = new HSSFWorkbook();

CellStyle styleboder = workbook.createCellStyle();
CellStyle titlestyle = workbook.createCellStyle();
//设置边框
styleboder.setBorderLeft(HSSFCellStyle.BORDER_THIN);
styleboder.setBorderRight(HSSFCellStyle.BORDER_THIN);
styleboder.setBorderTop(HSSFCellStyle.BORDER_THIN);
styleboder.setBorderBottom(HSSFCellStyle.BORDER_THIN);
HSSFSheet currSheet = workbook.createSheet("CommonQueryData");
//改变背景色
titlestyle.setFillPattern(HSSFCellStyle.SOLID_FOREGROUND);
titlestyle.setFillForegroundColor((short)43);
titlestyle.setFillForegroundColor(IndexedColors.GREY_40_PERCENT.getIndex());
titlestyle.setBorderLeft(HSSFCellStyle.BORDER_THIN);
titlestyle.setBorderRight(HSSFCellStyle.BORDER_THIN);
titlestyle.setBorderTop(HSSFCellStyle.BORDER_THIN);
titlestyle.setBorderBottom(HSSFCellStyle.BORDER_THIN);
//改变背景色
for(int i=0; i<excelList.size()+1;i++){
HSSFRow row = currSheet.createRow(i);
Map<String, Object> item=new HashMap<String, Object>();
if(i==0){
item = excelList.get(i);
}else{
item = excelList.get(i-1);
}
int j=0;
for(Iterator<String> iter = item.keySet().iterator();iter.hasNext();){
String key = iter.next();
Object value = item.get(key);
//判断columnsMap是否包含属性字段
boolean isExist = columnsMap.containsKey(key);
if(isExist){
HSSFCell cell = row.createCell(j++);
if(i==0){
/**标题**/
//写标题行
cell.setCellValue(columnsMap.get(key));
cell.setCellStyle(titlestyle);
}else{
//写内容行
cell.setCellStyle(styleboder);
cell.setCellValue(null == value ? "" : value.toString());
}
}
}
}
return workbook;
}

参考：http://www.yiibai.com/apache_poi/apache_poi_cells.html

参考：http://www.cnblogs.com/jyh317/p/3817171.html