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<Map<String,String>> 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<Map<String,String>>(); //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<rownum; i++) { Map<String,String> map = new LinkedHashMap<String,String>(); row = sheet.getRow(i); if(row !=null){ for (int j=0;j<colnum;j++){ cellData = (String) getCellFormatValue(row.getCell(j)); map.put(columns[j], cellData); } }else{ break; } list.add(map); } } //遍历解析出来的list for (Map<String,String> map : list) { for (Entry<String,String> 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。