java实现Excel的导入、导出

一、Excel的导入

导入可采用两种方式，一种是JXL，另一种是POI，但前者不能读取高版本的Excel(07以上)，后者更具兼容性。由于对两种方式都进行了尝试，就都贴出来分享(若有错误，请给予指正)

方式一、JXL导入  所需jar包 JXL.jar

 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;
 }

方式二、POI导入

所需jar包

poi-3.6-20091214.jar

poi-ooxml-3.6-20091214.jar

poi-ooxml-schemas-3.6-20091214.jar

xmlbeans-2.3.0.jar

dom4j-1.6.1.jar

jdom-2.0.6.jar

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;
    }

 

二、Excel导出

采用JXL实现

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;
}