java如何实现Excel的导入、导出操作

publicstaticList readExcelByJXL(String filePath){
List infoList =newArrayList();
Map> map =newHashMap>();
 infoList.clear();
try{
InputStream is =newFileInputStream(filePath);
Workbook workbook =Workbook.getWorkbook(is);
//获取第1张表
Sheet sheet = workbook.getSheet(0);
//获取总的列数
int columns = sheet.getColumns();
//获取总的行数
int rows = sheet.getRows();
//先列后行(j,i)
for(int i =1; i < rows; i++){
List contentList =newArrayList();
 contentList.clear();
for(int j =1; j < columns; j++){
 contentList.add(sheet.getCell(j,i).getContents());
}
 map.put("StorageInfo"+i, contentList);
}

//遍历map集合，封装成bean
for(Map.Entry> entry : map.entrySet()){
List list = entry.getValue();
PutStorageInfo storageInfo =newPutStorageInfo();
 storageInfo.setProductcode(list.get(0));
 storageInfo.setProductsort(list.get(1));
 storageInfo.setProductbrand(list.get(2));
 storageInfo.setProductname(list.get(3));
 storageInfo.setProductquantity(list.get(4));
 storageInfo.setProductcontent(list.get(5));
 storageInfo.setProductnetweight(list.get(6));
 storageInfo.setProductcountry(list.get(7));
 storageInfo.setProductpdate(list.get(8));
 storageInfo.setProductprice(list.get(9));
 storageInfo.setProductmark(list.get(10));

 infoList.add(storageInfo);
}
 is.close();
}catch(Exception e){
 e.printStackTrace();
}
return infoList;
}

publicstaticList readExcelByPOI(String filePath){
List infoList =newArrayList();
Map> map =newHashMap>();
 infoList.clear();
try{
InputStream is =newFileInputStream(filePath);

int index = filePath.lastIndexOf(".");
String postfix = filePath.substring(index+1);

Workbook workbook =null;
if("xls".equals(postfix)){
 workbook =newHSSFWorkbook(is);
}elseif("xlsx".equals(postfix)){
 workbook =newXSSFWorkbook(is);
}
//获取第1张表
Sheet sheet = workbook.getSheetAt(0);
//总的行数
int rows = sheet.getLastRowNum();
//总的列数--->最后一列为null则有问题，读取不完整，将表头的数目作为总的列数，没有的则补为null
int columns = sheet.getRow(0).getLastCellNum();
//先列后行
for(int i =1; i <= rows; i++){
　　Row row = sheet.getRow(i);
 if(null!= row && row.getFirstCellNum()==-1){//这一行是空行，不读取
 continue;
}
//这一行的总列数
// columns = row.getLastCellNum();
List contentList =newArrayList();
 contentList.clear();
for(int j =1; j < columns; j++){
if(row.getCell(j)!=null){
 row.getCell(j).setCellType(Cell.CELL_TYPE_STRING);
 contentList.add(row.getCell(j).getStringCellValue());
}else{
 contentList.add("");
}
}
 map.put("StorageInfo"+i, contentList);
}

//遍历map集合，封装成bean
for(Map.Entry> entry : map.entrySet()){
List list = entry.getValue();
PutStorageInfo storageInfo =newPutStorageInfo();
 storageInfo.setProductcode(list.get(0));
 storageInfo.setProductsort(list.get(1));
 storageInfo.setProductbrand(list.get(2));
 storageInfo.setProductname(list.get(3));
 storageInfo.setProductquantity(list.get(4));
 storageInfo.setProductcontent(list.get(5));
 storageInfo.setProductnetweight(list.get(6));
 storageInfo.setProductcountry(list.get(7));
 storageInfo.setProductpdate(list.get(8));
 storageInfo.setProductprice(list.get(9));
 storageInfo.setProductmark(list.get(10));

 infoList.add(storageInfo);
}
 is.close();
}catch(Exception e){
 e.printStackTrace();
}

return infoList;
} 

publicstaticvoid creatExcel(List storageInfoList,String fileName){
try{
OutputStream os =newFileOutputStream(fileName);
//创建可写的工作薄
WritableWorkbook workbook =Workbook.createWorkbook(os);
//创建第一张表
WritableSheet sheet = workbook.createSheet("Sheet1",0);
//设置根据内容自动宽度
CellView cellView =newCellView();
 cellView.setAutosize(true);
//在下边for循环中为每一列设置

//设置列宽度,此种方式参数的意思，i-->对应的行或列 j-->要设置的宽度
// sheet.setColumnView(0, 100);
// sheet.setRowView(0, 300);
//设置字体加粗且背景颜色为黄色
WritableFont boldFont =newWritableFont(WritableFont.ARIAL,10,WritableFont.BOLD);//黑体 
WritableCellFormat cellrFormate =newWritableCellFormat(boldFont);
 cellrFormate.setBackground(Colour.YELLOW);
//先添加表头
List titleList = getTitleList();
//循环创建单元格,先列后行
for(int i =0; i < titleList.size(); i++){
//sheet.setColumnView(i, cellView);
 sheet.setColumnView(i,20);

Label label =newLabel(i,0, titleList.get(i), cellrFormate);
 sheet.addCell(label);
}

LogUtil.logOut(JXLWriteExcel.class,storageInfoList.size()+"");

String[][] content = convertToArr(storageInfoList);
//设置content的自适应当前列的宽度，文本太对会自动换行 new Label(j, i+1, content[i][j-1],contentFormat);
WritableCellFormat contentFormat =newWritableCellFormat();
 contentFormat.setWrap(true);

//然后添加入库信息条目
for(int i =0; i < storageInfoList.size(); i++){
Label labelID =newLabel(0,i+1,(i+1)+"");
 sheet.addCell(labelID);

for(int j =1; j < titleList.size(); j++){
Label label =newLabel(j, i+1, content[i][j-1]);
 sheet.addCell(label);
}
}

//把创建的内容写入到输出流中，并关闭输出流
workbook.write();
 workbook.close();
 os.close();

//将存储了入库bean的list清空
storageInfoList.clear();

}catch(Exception e){
 e.printStackTrace();
}
}

privatestaticString[][] convertToArr(List storageInfoList){
String[][] content =newString[storageInfoList.size()][11];
for(int i =0; i < storageInfoList.size(); i++){
PutStorageInfo info = storageInfoList.get(i);
//每个bean中总项有11项
content[i][0]= info.getProductcode();
 content[i][1]= info.getProductsort();
 content[i][2]= info.getProductbrand();
 content[i][3]= info.getProductname();
 content[i][4]= info.getProductquantity();
 content[i][5]= info.getProductcontent();
 content[i][6]= info.getProductnetweight();
 content[i][7]= info.getProductcountry();
 content[i][8]= info.getProductpdate();
 content[i][9]= info.getProductprice();
 content[i][10]= info.getProductmark();
}
return content;

}

privatestaticList getTitleList(){
List list =newArrayList();
 list.add("Item No.");
 list.add("Product code");
 list.add("Sort");
 list.add("Brand");
 list.add("Product Name");
 list.add("Quantity(Pieces)");
 list.add("Content");
list.add("Net Weight");
 list.add("Country");
 list.add("Best before date");
 list.add("Price(EURO)");
 list.add("Remarks");

return list;
}