EasyExcel处理表头的缓存设置

在学习EasyExcel 时会发现针对使用类模型配置表头相关属性时,EasyExcel 会使用到缓存技术以提升表头的解析速度如下代码:
EasyExcel处理表头的缓存设置_第1张图片
这些参数再何时设置的哪?
EasyExcel处理表头的缓存设置_第2张图片

easyExcel 基础参数设置中会有这个参数filedCacheLocation 。默认采用的使用线程级别的缓存。
EasyExcel处理表头的缓存设置_第3张图片
默认支持3种方式:

  • THREAD_LOCAL:数据缓存在线程级别,当前线程使用完成时清除数据
  • MEMORY :数据缓存在内存级别,只有当程序停止时才会清除数据
  • NONE :不适应缓存

场景分析:

  1. 前向同一个excel和同一个sheet中重复写入数据时,并且写入属性非常多时:
    如下有个用户信息:
@NoArgsConstructor
@AllArgsConstructor
@Data
public class User {

  @ExcelProperty("用户名")
  private String username;
  @ExcelProperty("年龄")
  private String age;
  @ExcelProperty("attribute01")
  private String attribute01;
  @ExcelProperty("attribute02")
  private String attribute02;
  @ExcelProperty("attribute03")
  private String attribute03;
  @ExcelProperty("attribute04")
  private String attribute04;
  @ExcelProperty("attribute05")
  private String attribute05;
  @ExcelProperty("attribute06")
  private String attribute06;
  @ExcelProperty("attribute07")
  private String attribute07;
  @ExcelProperty("attribute08")
  private String attribute08;
  @ExcelProperty("attribute09")
  private String attribute09;
  @ExcelProperty("attribute10")
  private String attribute10;
  @ExcelProperty("attribute11")
  private String attribute11;
  @ExcelProperty("attribute12")
  private String attribute12;
  @ExcelProperty("attribute13")
  private String attribute13;
  @ExcelProperty("attribute14")
  private String attribute14;
  @ExcelProperty("attribute15")
  private String attribute15;
  @ExcelProperty("attribute16")
  private String attribute16;
  @ExcelProperty("attribute17")
  private String attribute17;
  @ExcelProperty("attribute18")
  private String attribute18;
  @ExcelProperty("attribute19")
  private String attribute19;
}

主程序:

  public void test01() {

    List<User> userList = new ArrayList<>();

    // 写入1000条数据
    for (int i = 0; i < 1000; i++) {
      userList.add(new User("lisi" + i, String.valueOf(i), String.valueOf(i), String.valueOf(i), String.valueOf(i),
          String.valueOf(i), String.valueOf(i), String.valueOf(i), String.valueOf(i), String.valueOf(i),
          String.valueOf(i), String.valueOf(i), String.valueOf(i), String.valueOf(i), String.valueOf(i),
          String.valueOf(i), String.valueOf(i), String.valueOf(i), String.valueOf(i), String.valueOf(i),
          String.valueOf(i)));
    }
    ExcelWriterBuilder excelWriterBuilder = new ExcelWriterBuilder();
    excelWriterBuilder.file("F:\\excel\\a.xls");
    excelWriterBuilder.filedCacheLocation(CacheLocationEnum.NONE);


    long startTime01 = System.currentTimeMillis();
    ExcelWriterSheetBuilder excelWriterSheetBuilder01 = new ExcelWriterSheetBuilder(excelWriterBuilder.build());
    excelWriterSheetBuilder01.sheetName("test01");
    excelWriterSheetBuilder01.doWrite(userList);
    long endTime01 = System.currentTimeMillis();
    System.out.println("总耗时 = " + (endTime01 - startTime01) + "ms");

    long startTime02 = System.currentTimeMillis();
    ExcelWriterSheetBuilder excelWriterSheetBuilder002 = new ExcelWriterSheetBuilder(excelWriterBuilder.build());
    excelWriterSheetBuilder002.sheetName("test02");
    excelWriterSheetBuilder002.doWrite(userList);
    long endTime02 = System.currentTimeMillis();
    System.out.println("总耗时 = " + (endTime02 - startTime02) + "ms");

    long startTime03 = System.currentTimeMillis();
    ExcelWriterSheetBuilder excelWriterSheetBuilder03 = new ExcelWriterSheetBuilder(excelWriterBuilder.build());
    excelWriterSheetBuilder03.sheetName("test03");
    excelWriterSheetBuilder03.doWrite(userList);
    long endTime03 = System.currentTimeMillis();
    System.out.println("总耗时 = " + (endTime03 - startTime03) + "ms");
  }

采用NONE时调用3次耗时:

第一次:
总耗时 = 596ms
总耗时 = 83ms
总耗时 = 60ms
第二次:
总耗时 = 580ms
总耗时 = 100ms
总耗时 = 54ms
第三次:
总耗时 = 578ms
总耗时 = 91ms
总耗时 = 53ms

采用MEMORY时调用3次耗时:

第一次:
总耗时 = 490ms
总耗时 = 32ms
总耗时 = 24ms
第二次:
总耗时 = 467ms
总耗时 = 35ms
总耗时 = 22ms
第三次:
总耗时 = 470ms
总耗时 = 34ms
总耗时 = 22ms

采用THREAD_LOCAL时调用3次耗时:

第一次:
总耗时 = 468ms
总耗时 = 38ms
总耗时 = 23ms
第二次:
总耗时 = 460ms
总耗时 = 32ms
总耗时 = 22ms
第三次:
总耗时 = 460ms
总耗时 = 33ms
总耗时 = 24ms

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