java实现Excel的导入、导出

publicstaticList<PutStorageInfo> readExcelByJXL(String filePath){
List<PutStorageInfo> infoList =newArrayList<PutStorageInfo>();
Map<String,List<String>> map =newHashMap<String,List<String>>();
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<String> contentList =newArrayList<String>();
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<String,List<String>> entry : map.entrySet()){
List<String> 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;
}

1. publicstaticList<PutStorageInfo> readExcelByPOI(String filePath){
   List<PutStorageInfo> infoList =newArrayList<PutStorageInfo>();
   Map<String,List<String>> map =newHashMap<String,List<String>>();
   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<String> contentList =newArrayList<String>();
   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<String,List<String>> entry : map.entrySet()){
   List<String> 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<PutStorageInfo> 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<String> 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<PutStorageInfo> 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<String> getTitleList(){
List<String> list =newArrayList<String>();
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;
}