EasyExcel使用筆記

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

• 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);
      }
  }