您的位置:首页 > 编程语言 > Java开发

Java操作Excel文件导入

2013-01-06 13:36 423 查看
引用:http://snowolf.iteye.com/blog/1569252

用Excel作为数据源,通过Java Web进行导入,需要POI的jar。

apachepoi(org.apache.poi 3.8)

可以支持公式、日期等格式!


不说废话,上代码:

Java代码


/**
* Jun 25, 2012
*/

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.List;

import org.apache.commons.io.FilenameUtils;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.CellValue;
import org.apache.poi.ss.usermodel.FormulaEvaluator;
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;

/**
* Excel组件
*
* @author Snowolf
* @version 1.0
* @since 1.0
*/
public abstract class ExcelHelper {

/**
* Excel 2003
*/
private final static String XLS = "xls";
/**
* Excel 2007
*/
private final static String XLSX = "xlsx";
/**
* 分隔符
*/
private final static String SEPARATOR = "|";

/**
* 由Excel文件的Sheet导出至List
*
* @param file
* @param sheetNum
* @return
*/
public static List<String> exportListFromExcel(File file, int sheetNum)
throws IOException {
return exportListFromExcel(new FileInputStream(file),
FilenameUtils.getExtension(file.getName()), sheetNum);
}

/**
* 由Excel流的Sheet导出至List
*
* @param is
* @param extensionName
* @param sheetNum
* @return
* @throws IOException
*/
public static List<String> exportListFromExcel(InputStream is,
String extensionName, int sheetNum) throws IOException {

Workbook workbook = null;

if (extensionName.toLowerCase().equals(XLS)) {
workbook = new HSSFWorkbook(is);
} else if (extensionName.toLowerCase().equals(XLSX)) {
workbook = new XSSFWorkbook(is);
}

return exportListFromExcel(workbook, sheetNum);
}

/**
* 由指定的Sheet导出至List
*
* @param workbook
* @param sheetNum
* @return
* @throws IOException
*/
private static List<String> exportListFromExcel(Workbook workbook,
int sheetNum) {

Sheet sheet = workbook.getSheetAt(sheetNum);

// 解析公式结果
FormulaEvaluator evaluator = workbook.getCreationHelper()
.createFormulaEvaluator();

List<String> list = new ArrayList<String>();

int minRowIx = sheet.getFirstRowNum();
int maxRowIx = sheet.getLastRowNum();
for (int rowIx = minRowIx; rowIx <= maxRowIx; rowIx++) {
Row row = sheet.getRow(rowIx);
StringBuilder sb = new StringBuilder();

short minColIx = row.getFirstCellNum();
short maxColIx = row.getLastCellNum();
for (short colIx = minColIx; colIx <= maxColIx; colIx++) {
Cell cell = row.getCell(new Integer(colIx));
CellValue cellValue = evaluator.evaluate(cell);
if (cellValue == null) {
continue;
}
// 经过公式解析,最后只存在Boolean、Numeric和String三种数据类型,此外就是Error了
// 其余数据类型,根据官方文档,完全可以忽略http://poi.apache.org/spreadsheet/eval.html
switch (cellValue.getCellType()) {
case Cell.CELL_TYPE_BOOLEAN:
sb.append(SEPARATOR + cellValue.getBooleanValue());
break;
case Cell.CELL_TYPE_NUMERIC:
// 这里的日期类型会被转换为数字类型,需要判别后区分处理
if (DateUtil.isCellDateFormatted(cell)) {
sb.append(SEPARATOR + cell.getDateCellValue());
} else {
sb.append(SEPARATOR + cellValue.getNumberValue());
}
break;
case Cell.CELL_TYPE_STRING:
sb.append(SEPARATOR + cellValue.getStringValue());
break;
case Cell.CELL_TYPE_FORMULA:
break;
case Cell.CELL_TYPE_BLANK:
break;
case Cell.CELL_TYPE_ERROR:
break;
default:
break;
}
}
list.add(sb.toString());
}
return list;
}
}

由于Excel中的数据有日期、公式等等格式,参考http://poi.apache.org/spreadsheet/eval.html做了修改,完全兼容。


当前的Excel,C列是根据A、B相乘计算而来,D列是日期格式:



测试下:

Java代码


/**
* Jun 25, 2012
*/

import java.io.File;
import java.io.IOException;
import java.util.List;

import static org.junit.Assert.*;
import org.junit.Test;

/**
*
* @author Snowolf
* @version 1.0
* @since 1.0
*/
public class ExcelHelperTest {

@Test
public void test() {
String path = "excel.xlsx";
List<String> list = null;
try {
list = ExcelHelper.exportListFromExcel(new File(path), 0);
assertNotNull(list);
} catch (IOException e) {
fail();
}

}
}

就是这样了



详见附件!


存档于此,备查~~


poi.zip (14.3 KB)
下载次数: 52

查看图片附件
内容来自用户分享和网络整理,不保证内容的准确性,如有侵权内容,可联系管理员处理 点击这里给我发消息
标签: