最近项目要做个批量导入数据到数据库。所以学习了下：
1，工具具体代码如下（我自己也带着main方法测试了），用到了POI的jar.自己记得引用。
我用的jar:
compile ('org.apache.poi:poi:3.17-beta1') compile ('org.apache.poi:poi-ooxml:3.17-beta1') compile ('org.apache.poi:poi-ooxml-schemas:3.17-beta1') compile ('org.apache.poi:poi-scratchpad:3.17-beta1') compile('commons-io:commons-io:+')
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import org.apache.poi.hssf.usermodel.HSSFDateUtil; import org.apache.poi.hssf.usermodel.HSSFWorkbook; import org.apache.poi.poifs.filesystem.POIFSFileSystem; 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.FileInputStream; import java.io.IOException; import java.io.InputStream; import java.text.DecimalFormat; import java.text.SimpleDateFormat; import java.util.*; /** * Created by XuPengFei on 2017/7/27. */ public class ExcelReader { static private Workbook wb; static private Sheet sheet; static private Row row; private static DecimalFormat df = new DecimalFormat("0");//数字格式，防止长数字成为科学计数法形式，或者int变为double形式 /** *读取Excel表格的标题行 * @param fileName Excel 文件路径 * @param titleRow titleRow==0 * @return String[] titles */ public static String[] readExcelTitle(String fileName, int titleRow) { InputStream is; try { is = new FileInputStream(fileName); String postfix = fileName.substring(fileName.lastIndexOf("."), fileName.length()); if (postfix.equals(".xls")) { // 2003 Excel 文件 wb = new HSSFWorkbook(new POIFSFileSystem(is)); } else { // 2007 Excel 文件 wb = new XSSFWorkbook(is); } } catch (IOException e) { e.printStackTrace(); } sheet = wb.getSheetAt(0);//获取Excel里面的第一张表格 row = sheet.getRow(titleRow);// 获取第一行（约定第一行是标题行：titleRow==0） int colNum = row.getPhysicalNumberOfCells();// 获取此行的列数 String[] titles = new String[colNum]; for (int i = 0; i < titles.length; i++) { titles[i] = getCellFormatValue(row.getCell(i));//调用下面方法获取Cell的值 } return titles; } /** * 读取 Excel 内容 * @param fileName Excel 文件路径 * @param contentStartRow contentStartRow == 1 * @return List<Map<String,String>> */ public static List<Map<String, String>> readExcelContent(String fileName, int contentStartRow) { List<Map<String, String>> list = new ArrayList<>();//存放表格内容 Map<String, String> content = null;//存放一行行的内容：key-value try { InputStream is = new FileInputStream(fileName); String postfix = fileName.substring(fileName.lastIndexOf("."), fileName.length()); if (postfix.equals(".xls")) { // 2003 Excel 文件 wb = new HSSFWorkbook(new POIFSFileSystem(is)); } else {// 2007 Excel 文件 wb = new XSSFWorkbook(is); } } catch (IOException e) { e.printStackTrace(); } sheet = wb.getSheetAt(0); int rowNum = sheet.getLastRowNum();// 得到总行数 row = sheet.getRow(contentStartRow - 1);// 得到表头title行 int colNum = row.getPhysicalNumberOfCells(); String titles[] = readExcelTitle(fileName, contentStartRow - 1); // 正文内容应该从第二行开始,第一行为表头的标题 for (int i = contentStartRow; i <rowNum+1; i++) { int j = 0; row = sheet.getRow(i); content = new LinkedHashMap<>(); do { content.put(titles[j], getCellFormatValue(row.getCell(j)).trim());//调用下面 getCellFormatValue 方法获取Cell的值 j++; } while (j < colNum); list.add(content); } return list; } /** * 根据Cell类型设置数据 * @param cell * @return */ private static String getCellFormatValue(Cell cell) { String cellvalue = ""; if (cell != null) { // 判断当前Cell的Type switch (cell.getCellType()) { // 如果当前Cell的Type为NUMERIC case Cell.CELL_TYPE_NUMERIC: // 如果是纯数字取得当前Cell的数值 if (HSSFDateUtil.isCellDateFormatted(cell)) { // 如果是date类型则 ，获取该cell的date值 cellvalue = HSSFDateUtil.getJavaDate(cell.getNumericCellValue()).toString(); } else { // 纯数字 cellvalue = df.format(cell.getNumericCellValue()); } break; case Cell.CELL_TYPE_FORMULA: { //公式 // 判断当前的cell是否为Date if (HSSFDateUtil.isCellDateFormatted(cell)) { // 方法2：这样子的data格式是不带带时分秒的：2011-10-12 Date date = cell.getDateCellValue(); SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd"); cellvalue = sdf.format(date); } else { // 如果是纯数字取得当前Cell的数值 cellvalue = String.valueOf(cell.getNumericCellValue()); } break; } // 如果当前Cell的Type为String case Cell.CELL_TYPE_STRING: // 取得当前的Cell字符串 cellvalue = cell.getStringCellValue(); break; default: // 默认的Cell值 cellvalue = cell.getRichStringCellValue() == null ? null : cell.getRichStringCellValue().toString(); } } else { cellvalue = ""; } return cellvalue; } /** * @param fileName ：Excel 文件路径 * @return List<Map<String,String>> * @method 读取 Excel 内容,返回 二维数组 * @Return String [][] */ public static String [][] readExcel(String fileName, int contentStartRow) { List<Map<String, String>> list = new ArrayList<>(); String [][] strings; Map<String, String> content = null; try { InputStream is; is = new FileInputStream(fileName); String postfix = fileName.substring(fileName.lastIndexOf("."), fileName.length()); if (postfix.equals(".xls")) { // 针对 2003 Excel 文件 wb = new HSSFWorkbook(new POIFSFileSystem(is)); } else { // 针对2007 Excel 文件 wb = new XSSFWorkbook(is); } } catch (IOException e) { e.printStackTrace(); } sheet = wb.getSheetAt(0); int rowNum = sheet.getLastRowNum();// 得到总行数 row = sheet.getRow(contentStartRow - 1);//和title一样 int colNum = row.getPhysicalNumberOfCells(); strings=new String [rowNum+1][colNum]; String titles[] = readExcelTitle(fileName, contentStartRow - 1); // 正文内容应该从第二行开始,第一行为表头的标题 for (int i = 0; i <rowNum+1; i++) { row = sheet.getRow(i); content = new LinkedHashMap<>(); for (int j=0;j<colNum;j++){ strings[i][j]=getCellFormatValue(row.getCell(j)).trim(); } } return strings; } /** * 自己测试 main方法 * @param args */ public static void main(String[] args) { String file = "C://Users//acer//Desktop//Commodity.xls"; //测试返回集合 List<Map<String, String>> list = ExcelReader.readExcelContent(file,1); Map<String, String> map = null; for (int i = 0; i < list.size(); i++) { map = list.get(i); Map.Entry<String, String> entry = null; for (Iterator<Map.Entry<String, String>> it = map.entrySet().iterator(); it.hasNext(); ) { entry = it.next(); System.out.println("entry.getKey: "+entry.getKey() + "-------->, entry.getValue:" + entry.getValue()); } System.out.println("............"); } //测试返回二维数组 String [][] strings2 = ExcelReader.readExcel(file,1); for(int m=0;m<strings2.length;m++){ for(int n=0;n<strings2[m].length;n++){ System.out.println(strings2[m][n]); } } } }