POI匯出匯入Excel的方法，拿去即可用

/**

* * @param request
* @param response
* @param titles 表頭行
* @param datas 資料
* @param filename 檔名
//寫入資料
int a=1;
for(
int j=
0;jsize()
;j++
)else
if(i==1)
}}//匯出資料
trycatch
(exception e)
finally
if(wb!=null)
}}

if

(valueobject instanceof
string
)else
if(valueobject instanceof
integer
)else
if(valueobject instanceof
bigdecimal
)else

public

void
inputexcel
(multipartfile file)
throws exception
//獲取檔名
string originalfilename = file.
getoriginalfilename()
;//獲取字尾
string filetype = originalfilename.
substring
(originalfilename.
lastindexof
(".")+
1, originalfilename.
length()
);//獲取輸入流
inputstream inputstream = file.
getinputstream()
; workbook wb = null;
//excel資料
list
datalist=
newarraylist
<
>()
;try
else
if(xlsx.
equals
(filetype)
)else
// 解析sheet
for(
int i =
0; i < wb.
getnumberofsheets()
; i++)if
(row.
getfirstcellnum()
<0)
exceldata data=
newexceldata()
;//獲取總列數
int cellcount = row.
getphysicalnumberofcells()
;// 解析sheet 的列
for(
int k =
0; k < cellcount; k++
) datalist.
add(data);}
}}catch
(exception e)
finally
if(wb!=null)
} datalist.
stream()
.foreach
(x-> system.out.
println
(x));}
private exceldata getcellvalue
(exceldata data,
int num, cell cell)
else
}break
;case cell.cell_type_boolean:
//布林型
cellvalue = string.
valueof
(cell.
getbooleancellvalue()
);break
;case cell.cell_type_blank:
//空白
cellvalue = cell.
getstringcellvalue()
;break
;case cell.cell_type_error:
//錯誤
cellvalue =
"錯誤"
;break
;case cell.cell_type_formula:
//公式
cellvalue =
"錯誤"
;break
;default
: cellvalue =
"錯誤";}
cellvalue = cellvalue.
trim()
;if(num==0)
else
if(num==1)
return data;
}

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