一、需要导入的jar
1.commons-collections4-4.1.jar
2.poi-3.17-beta1.jar
3.poi-ooxml-3.17-beta1.jar
4.poi-ooxml-schemas-3.17-beta1.jar
5.xmlbeans-2.6.0.jar
二、主要API,了解springcloud架构可以加求求：三五三六二四七二五九
1.import org.apache.poi.ss.usermodel.Workbook,对应Excel文档；
2.import org.apache.poi.hssf.usermodel.HSSFWorkbook，对应xls格式的Excel文档；
3.import org.apache.poi.xssf.usermodel.XSSFWorkbook，对应xlsx格式的Excel文档；
4.import org.apache.poi.ss.usermodel.Sheet，对应Excel文档中的一个sheet；
5.import org.apache.poi.ss.usermodel.Row，对应一个sheet中的一行；
6.import org.apache.poi.ss.usermodel.Cell，对应一个单元格。
三、代码如下
package poi;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.linkedHashMap;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.DateUtil;
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;
public class Testpoi {
public static void main(String[] args) {
Workbook wb =null;
Sheet sheet = null;
Row row = null;
List> list = null;
String cellData = null;
String filePath = "D:\test.xlsx";
String columns[] = {"name","age","score"};
wb = readExcel(filePath);
if(wb != null){
//用来存放表中数据
list = new ArrayList>();
//获取第一个sheet
sheet = wb.getSheetAt(0);
//获取最大行数
int rownum = sheet.getPhysicalNumberOfRows();
//获取第一行
row = sheet.getRow(0);
//获取最大列数
int colnum = row.getPhysicalNumberOfCells();
for (int i = 1; i map = new linkedHashMap();
row = sheet.getRow(i);
if(row !=null){
for (int j=0;j map : list) {
for (Entry entry : map.entrySet()) {
System.out.print(entry.getKey()+":"+entry.getValue()+",");
}
System.out.println();
}
}
//读取excel
public static Workbook readExcel(String filePath){
Workbook wb = null;
if(filePath==null){
return null;
}
String extString = filePath.substring(filePath.lastIndexOf("."));
InputStream is = null;
try {
is = new FileInputStream(filePath);
if(".xls".equals(extString)){
return wb = new HSSFWorkbook(is);
}else if(".xlsx".equals(extString)){
return wb = new XSSFWorkbook(is);
}else{
return wb = null;
}
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return wb;
}
public static Object getCellFormatValue(Cell cell){
Object cellValue = null;
if(cell!=null){
//判断cell类型
switch(cell.getCellType()){
case Cell.CELL_TYPE_NUMERIC:{
cellValue = String.valueOf(cell.getNumericCellValue());
break;
}
case Cell.CELL_TYPE_FORMULA:{
//判断cell是否为日期格式
if(DateUtil.isCellDateFormatted(cell)){
//转换为日期格式YYYY-mm-dd
cellValue = cell.getDateCellValue();
}else{
//数字
cellValue = String.valueOf(cell.getNumericCellValue());
}
break;
}
case Cell.CELL_TYPE_STRING:{
cellValue = cell.getRichStringCellValue().getString();
break;
}
default:
cellValue = "";
}
}else{
cellValue = "";
}
return cellValue;
}
} 四、运行结果
代码运行前保证在D盘下有一个test.xlsx文档，不然报文件找不到异常；Excel文档中的表头要和代码中的String columns[] = {"name","age","score"}对应起来。
转载于：https://www.cnblogs.com/hhhshct/p/7255915.html
