poi上传文件，
准备
<dependencies>
<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>poi</artifactId>
<version>3.17</version>
</dependency>
<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>poi-ooxml</artifactId>
<version>3.17</version>
</dependency>
</dependencies>
我做了一个测试的demo用于上传excel文件到服务端，本来想弄进数据库，但是嫌麻烦就直接显示在了控制台上面，
把读取到的excel文件放入中间list集合中。在存放到对象集合中
假如要放到数据库中，对集合进行遍历，调用添加方法，把遍历的对象一个一个放入数据库。
package cn.scetc.work;
import cn.scetc.entity.Customer;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.ss.usermodel.Workbook;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import java.io.*;
import java.util.ArrayList;
import java.util.List;
/**
* @Title: Demo
* @Description:
* @Auther:
* @Version: 1.0
* @create 2019/3/14 11:15
*/
public class Demo {
public static void main(String[] args) {
List<Customer> customerList=new ArrayList<Customer>();
try {
List<String[]> list = readExcel("D:\杭州云润\唐山导入\水表用户基础信息导入模板.xlsx");
for (String[] str:list) {
for (String s:str) {
System.out.print(s+" ");
}
System.out.println("");
Customer customer=new Customer();
customer.setUserName(str[0]);
customer.setUserState(str[1]);
customer.setCeMing(str[2]);
customer.setUserAddress(str[3]);
customer.setUserTel(str[4]);
customer.setUserIDcard(str[5]);
customer.setIcardNumber(str[6]);
customer.setUserType(str[7]);
customer.setUserBalance(str[8]);
customer.setUserWater(str[9]);
customer.setMeterId(str[10]);
customer.setMeterButton(str[11]);
customer.setMeterState(str[12]);
customerList.add(customer);
}
}catch (Exception e){
e.printStackTrace();
}
System.out.println("-------------------------------------------------------------------------");
for (Customer customer:customerList) {
System.out.println(" ("+customer.getUserName()+" ) ("+customer.getMeterId()+") ("+customer.getUserType()+") ("+customer.getMeterButton()+") ("+customer.getMeterState()+") ");
}
}
public static List<String[]> readExcel(String file) throws IOException {
//检查文件
checkFile(file);
//获得Workbook工作薄对象
Workbook workbook = getWorkBook(file);
//创建返回对象，把每行中的值作为一个数组，所有行作为一个集合返回
List<String[]> list = new ArrayList<String[]>();
if(workbook != null){
//sheet工作表读取
for(int sheetNum = 0;sheetNum < workbook.getNumberOfSheets();sheetNum++){
//获得当前sheet工作表
Sheet sheet = workbook.getSheetAt(sheetNum);
if(sheet == null){
continue;
}
//获得当前sheet的开始行
int firstRowNum = sheet.getFirstRowNum();
//获得当前sheet的结束行
int lastRowNum = sheet.getLastRowNum();
//循环除了第一行的所有行
for(int rowNum =10;rowNum <= lastRowNum;rowNum++){ //为了过滤到第一行因为我的第一行是数据库的列
//获得当前行
Row row = sheet.getRow(rowNum);
if(row == null){
continue;
}
//获得当前行的开始列
int firstCellNum = row.getFirstCellNum();
//获得当前行的列数
int lastCellNum = row.getLastCellNum();//为空列获取
// int lastCellNum = row.getPhysicalNumberOfCells();//为空列不获取
// String[] cells = new String[row.getPhysicalNumberOfCells()];
String[] cells = new String[row.getLastCellNum()];
//循环当前行
for(int cellNum =firstCellNum; cellNum < lastCellNum;cellNum++){
Cell cell = row.getCell(cellNum);
cells[cellNum] = getCellValue(cell);
}
list.add(cells);
}
}
}
return list;
}
public static void checkFile(String file) throws IOException{
//判断文件是否存在
if(null == file){
throw new FileNotFoundException("文件不存在！");
}
//判断文件是否是excel文件
if(!file.endsWith("xls") && !file.endsWith("xlsx")){
throw new IOException(file + "不是excel文件");
}
}
public static Workbook getWorkBook(String file) {
//创建Workbook工作薄对象，表示整个excel
Workbook workbook = null;
try {
//获取excel文件的io流
InputStream is = new FileInputStream(file);
//根据文件后缀名不同(xls和xlsx)获得不同的Workbook实现类对象
if(file.endsWith("xls")){
//2003
workbook = new HSSFWorkbook(is);
}else if(file.endsWith("xlsx")){
//2007
workbook = new XSSFWorkbook(is);
}
} catch (IOException e) {
e.printStackTrace();
}
return workbook;
}
public static String getCellValue(Cell cell){
String cellValue = "";
if(cell == null){
return cellValue;
}
//把数字当成String来读，避免出现1读成1.0的情况
if(cell.getCellType() == Cell.CELL_TYPE_NUMERIC){
cell.setCellType(Cell.CELL_TYPE_STRING);
}
//判断数据的类型
switch (cell.getCellType()){
case Cell.CELL_TYPE_NUMERIC: //数字
cellValue = String.valueOf(cell.getNumericCellValue());
break;
case Cell.CELL_TYPE_STRING: //字符串
cellValue = String.valueOf(cell.getStringCellValue());
break;
case Cell.CELL_TYPE_BOOLEAN: //Boolean
cellValue = String.valueOf(cell.getBooleanCellValue());
break;
case Cell.CELL_TYPE_FORMULA: //公式
// cellValue = String.valueOf(cell.getCellFormula());
cellValue = String.valueOf(cell.getStringCellValue());
break;
case Cell.CELL_TYPE_BLANK: //空值
cellValue = "";
break;
case Cell.CELL_TYPE_ERROR: //故障
cellValue = "非法字符";
break;
default:
cellValue = "未知类型";
break;
}
return cellValue;
}
}