关于jxl 导出excel问题
FileInputStream in = new FileInputStream(paths+"/service/exportexl/yc.xls");

wb = Workbook.getWorkbook(in);

OutputStream os = response.getOutputStream();
WritableWorkbook wwb = Workbook.createWorkbook(os,wb);
WritableSheet ws = wwb.createSheet("Sheet1", 0);
System.out.println(ws+"xxxx");
//设置列宽
for(int i=0;i<8;i++){
ws.setColumnView(i,30);
}
SapBen sb=new SapBen();

WritableCell cell = ws.getWritableCell(0,1);

CellFormat cf = cell.getCellFormat();
Label lab = new Label(0,1,"单位：" );
lab.setCellFormat(cf);

ws.addCell(lab); --- 这行报错为空指针异常 异常 Excel
[解决办法]
确认一下CellFormat cf = cell.getCellFormat(); 中的cf是否为null
[解决办法]
ws.addCell(lab); --- 这行报错为空指针异常
这一行就两个参数，
那么你挨个的输出一下ws和lab
看看哪个为空。