发现自己一年之前的poi工具太重,并没有实现最基础的功能.
又重新抽了一个基础版的poi工具.
最基本的,导入到excel,存入本机
-- pom(这个直接在maven上搜不知道为啥搜不到)
<dependency> <groupId>org.apache.poi</groupId> <artifactId>poi-ooxml</artifactId> <version>3.17-beta1</version></dependency><dependency> <groupId>org.apache.poi</groupId> <artifactId>poi</artifactId> <version>3.17-beta1</version></dependency>
-- 代码
import [com.google.common.collect.Lists]import java.io.File;import java.io.FileNotFoundException;import java.io.FileOutputStream;import java.io.IOException;import java.io.OutputStream;import java.sql.Timestamp;import java.util.Calendar;import java.util.Date;import java.util.HashMap;import java.util.List;import java.util.Map;import java.util.Set;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;/**
* @author: hman
* @date 2018-11-16
* @desc: poi工具
*/public class ExcelUtils { /**
* @param sheetName excel文件名
* @param headMap 表头map
* @param dataList 表格数据
*/
public static void exportXlsx(OutputStream outputStream, String sheetName, Map<String, String> headMap, List<Map<String, Object>> dataList) {
Workbook workbook = exportXlsx(sheetName, headMap, dataList); try {
workbook.write(outputStream);
} catch (Exception e) {
e.printStackTrace();
} finally { if (outputStream != null) { try {
outputStream.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
} /**
* 导出数据
*/
public static Workbook exportXlsx(String sheetName, Map<String, String> headMap,
List<Map<String, Object>> dataList) {
Workbook workbook = new XSSFWorkbook();
Sheet sheet = workbook.createSheet(sheetName);
int rowIndex = 0, columnIndex = 0; Set<String> keys = headMap.keySet(); //表头
Row row = sheet.createRow(rowIndex++); for (String key : keys) {
Cell cell = row.createCell(columnIndex++);
cell.setCellValue(headMap.get(key));
} //内容
if (dataList != null && !dataList.isEmpty()) { for (Map<String, Object> map : dataList) {
row = sheet.createRow(rowIndex++);
columnIndex = 0; for (String key : keys) {
Cell cell = row.createCell(columnIndex++);
setCellValue(cell, map.get(key));
}
}
} return workbook;
}
private static void setCellValue(Cell cell, Object obj) { if (obj == null) { return;
} if (obj instanceof String) {
cell.setCellValue((String) obj);
} else if (obj instanceof Date) { Date date = (Date) obj; if (date != null) {
cell.setCellValue(DateUtil.formatToDate(date.getTime()));
}
} else if (obj instanceof Calendar) {
Calendar calendar = (Calendar) obj; if (calendar != null) {
cell.setCellValue(DateUtil.formatToDate(calendar.getTimeInMillis()));
}
} else if (obj instanceof Timestamp) {
Timestamp timestamp = (Timestamp) obj; if (timestamp != null) {
cell.setCellValue(DateUtil.formatDateStrTime(timestamp.getTime()));
}
} else if (obj instanceof Long) {
Long longstr = (Long) obj; if (longstr != null) {
cell.setCellValue(DateUtil.formatToDate(longstr));
}
} else if (obj instanceof Double) {
cell.setCellValue((Double) obj);
} else {
cell.setCellValue(obj.toString());
}
}
}-- 自己测试
public static void main(String[] args) throws FileNotFoundException { Map<String, Object> data = new HashMap<String, Object>() {{
put("createTime", 1);
put("updateTime", 1);
put("errorCode", 1);
}};
List<Map<String, Object>> objects = Lists.newArrayList();
objects.add(data); String dateStrTime = DateUtil.formatDateStrTime(System.currentTimeMillis() / 1000);
File file = new File( "/Users/momo/Downloads/test" + ".xls"); if (file.exists()) {
file.delete();
}
OutputStream outputStream = new FileOutputStream(file); Map head = new HashMap<String, Object>() {
{
put("createTime", "创建时间");
put("updateTime", "更新时间");
put("errorCode", "错误码");
}
};
ExcelUtils.exportXlsx(outputStream, "testSheet", head, objects);
}
}
作者：H_Man
链接：https://www.jianshu.com/p/21955d23e55d