EasyExcel使用筆記

easyexcel重寫了poi對07版Excel的解析,下降了內存消耗，對模型轉換進行了封裝，而後寫了下簡單案例。

GitHub地址：https://github.com/alibaba/easyexcel

excel文件用的我的考勤表，放在項目根路徑java

boot項目導入pom依賴

<dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>easyexcel</artifactId>
            <version>1.1.2-beta5</version>
        </dependency>

建立簡單的模型類

import com.alibaba.excel.annotation.ExcelProperty; import com.alibaba.excel.metadata.BaseRowModel; import lombok.Data; @Data public class ExcelPropertyIndexModel extends BaseRowModel { @ExcelProperty(value = "日期", index = 0) private String dateJuly; @ExcelProperty(value = "上班時間", index = 1) private String onDuty; @ExcelProperty(value = "下班時間", index = 2) private String offDuty; @ExcelProperty(value = "加班時長", index = 3) private String overtime; @ExcelProperty(value = "備註", index = 6) private String last; }

建立監聽器（解析）

import com.alibaba.excel.context.AnalysisContext; import com.alibaba.excel.event.AnalysisEventListener; import lombok.extern.slf4j.Slf4j; import org.springframework.stereotype.Component; import java.util.ArrayList; import java.util.List; @Slf4j @Component public class ExcelListener extends AnalysisEventListener { public List<List<Object>> datas = new ArrayList<>(); public List<List<Object>> getDatas() { return datas; } public void setDatas(List<List<Object>> datas) { this.datas = datas; } @Override public void invoke(Object object, AnalysisContext context) { List<Object> stringList = (List<Object>) object; datas.add(stringList); } @Override public void doAfterAllAnalysed(AnalysisContext context) { //解析結束銷燬不用的資源 // datas.clear();
 } }

建立工具類（讀取，導出）

@Slf4j public class ExcelUtils { /** * 解析excel文件內容 * * @param fileName * @return
     */
    public static List<List<Object>> readExcel(String fileName) { File file = new File(fileName); InputStream inputStream = null; try { inputStream = new FileInputStream(file); } catch (FileNotFoundException e) { e.printStackTrace(); } // 解析每行結果在listener中處理
        ExcelListener listener = new ExcelListener(); ExcelReader excelReader = new ExcelReader(inputStream, ExcelTypeEnum.XLS, null, listener); excelReader.read(); List<List<Object>> datas = listener.getDatas(); return datas; } /** * 導出方法,生成excle * * @param filePath 絕對路徑, * @param data 數據源 * @param sheet excle頁面樣式 */
    public static void writeSimpleBySheet(String filePath, List<List<Object>> data, Sheet sheet) { OutputStream outputStream = null; ExcelWriter writer = null; try { outputStream = new FileOutputStream(filePath); writer = EasyExcelFactory.getWriter(outputStream); writer.write1(data, sheet); } catch (FileNotFoundException e) { log.error("找不到文件或文件路徑錯誤, 文件：{}", filePath); } finally { try { if (writer != null) { writer.finish(); } if (outputStream != null) { outputStream.close(); } } catch (IOException e) { log.error("excel文件導出失敗, 失敗緣由：{}", e); } } } }

建立Controller類查看實現效果

@RestController @RequestMapping("/excel") @Slf4j public class ExcelController { /** * 解析EXCEL文件 * @return
     */ @GetMapping("/writerExcel") @ResponseBody public List<List<Object>> writerExcel() { List<List<Object>> lists = ExcelUtils.readExcel("withHead.xls"); if (lists != null) { log.info("表數據："+lists); } else { log.info("空異常！"); } return lists; } /** * 導出EXCEL文件 * @param filePath 文件絕對路徑 */ @PostMapping(value = "/exportExcel") public void exportExcel(@ApiParam(name="filePath",value="文件路徑",required=true) @RequestParam String filePath){ //木有數據庫數據源，用xls的解析數據看成數據源
        List<List<Object>> lists = ExcelUtils.readExcel("withHead.xls"); Sheet sheet1 = new Sheet(1, 0, ExcelPropertyIndexModel.class); ExcelUtils.writeSimpleBySheet(filePath,lists,sheet1); } }