java Excel导入、自适应版本、将Excel转成List<map>对象

/**
*  Excel文件流 -->  List <Map<String,Object>>  对象
想直接转成java bean的朋友可以使用fastjson将  List<Map<String,Object>>转成bean对象
*
*/

public class ImportExcelUtil {

private static Logger log = Logger.getLogger(ImportExcelUtil.class);

private final static String excel2003L = ".xls"; // 2003- 版本的excel
private final static String excel2007U = ".xlsx"; // 2007+ 版本的excel

/**
* 将流中的Excel数据转成List<Map>
*
* @param in
*            输入流
* @param fileName
*            文件名（判断Excel版本）
* @param mapping
*            字段名称映射
* @return
* @throws Exception
*/
public static List<Map<String, Object>> parseExcel(InputStream in, String fileName,
Map<String, String> mapping) throws Exception {
// 根据文件名来创建Excel工作薄
Workbook work = getWorkbook(in, fileName);
if (null == work) {
throw new Exception("创建Excel工作薄为空！");
}
Sheet sheet = null;
Row row = null;
Cell cell = null;
// 返回数据
List<Map<String, Object>> ls = new ArrayList<Map<String, Object>>();

// 遍历Excel中所有的sheet
for (int i = 0; i < work.getNumberOfSheets(); i++) {
sheet = work.getSheetAt(i);
if (sheet == null)
continue;

// 取第一行标题
row = sheet.getRow(0);
String title[] = null;
if (row != null) {
title = new String[row.getLastCellNum()];

for (int y = row.getFirstCellNum(); y < row.getLastCellNum(); y++) {
cell = row.getCell(y);
title[y] = (String) getCellValue(cell);
}

} else
continue;
log.info(JSON.toJSONString(title));

// 遍历当前sheet中的所有行
for (int j = 1; j < sheet.getLastRowNum() + 1; j++) {
row = sheet.getRow(j);
Map<String, Object> m = new HashMap<String, Object>();
// 遍历所有的列
for (int y = row.getFirstCellNum(); y < row.getLastCellNum(); y++) {
cell = row.getCell(y);
String key = title[y];
// log.info(JSON.toJSONString(key));
m.put(mapping.get(key), getCellValue(cell));
}
ls.add(m);
}

}
work.close();
return ls;
}

/**
* 描述：根据文件后缀，自适应上传文件的版本
*
* @param inStr
*            ,fileName
* @return
* @throws Exception
*/
public static Workbook getWorkbook(InputStream inStr, String fileName) throws Exception {
Workbook wb = null;
String fileType = fileName.substring(fileName.lastIndexOf("."));
if (excel2003L.equals(fileType)) {
wb = new HSSFWorkbook(inStr); // 2003-
} else if (excel2007U.equals(fileType)) {
wb = new XSSFWorkbook(inStr); // 2007+
} else {
throw new Exception("解析的文件格式有误！");
}
return wb;
}

/**
* 描述：对表格中数值进行格式化
*
* @param cell
* @return
*/
public static Object getCellValue(Cell cell) {
Object value = null;
DecimalFormat df = new DecimalFormat("0"); // 格式化number String字符
SimpleDateFormat sdf = new SimpleDateFormat("yyy-MM-dd"); // 日期格式化
DecimalFormat df2 = new DecimalFormat("0"); // 格式化数字

switch (cell.getCellType()) {
case Cell.CELL_TYPE_STRING:
value = cell.getRichStringCellValue().getString();
break;
case Cell.CELL_TYPE_NUMERIC:
if ("General".equals(cell.getCellStyle().getDataFormatString())) {
value = df.format(cell.getNumericCellValue());
} else if ("m/d/yy".equals(cell.getCellStyle().getDataFormatString())) {
value = sdf.format(cell.getDateCellValue());
} else {
value = df2.format(cell.getNumericCellValue());
}
break;
case Cell.CELL_TYPE_BOOLEAN:
value = cell.getBooleanCellValue();
break;
case Cell.CELL_TYPE_BLANK:
value = "";
break;
default:
break;
}
return value;
}

public static void main(String[] args) throws Exception {
File file = new File("D:\\studn.xls");
FileInputStream fis = new FileInputStream(file);
Map<String, String> m = new HashMap<String, String>();
m.put("id", "id");
m.put("姓名", "name");
m.put("年龄", "age");
List<Map<String, Object>> ls = parseExcel(fis, file.getName(), m);
System.out.println(JSON.toJSONString(ls));
}
}

输出结果

[{"age":"13","id":"11","name":"张三"},{"age":"23","id":"21","name":"李四"},{"age":"33","id":"31","name":"王五"}]

用到的包
<org.poi-version>3.14</org.poi-version>
<!-- Excel -->
<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>poi</artifactId>
<version>${org.poi-version}</version>
</dependency>
<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>poi-ooxml</artifactId>
<version>${org.poi-version}</version>
</dependency>
<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>poi-examples</artifactId>
<version>${org.poi-version}</version>
</dependency>
<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>poi-excelant</artifactId>
<version>${org.poi-version}</version>
</dependency>