JAVA解析Excel工具easyexcel之快速上手

easyexcel的底層是poi，它是對poi的封裝，原理是在讀取excel文件達到一定的數量後進行清空內存，並再繼續讀取內容，從而達到防止內存溢出的問題。
64M內存1分鐘內讀取75M(46W行25列)的Excel：

簡單上手三步驟：
1、編寫監聽器，當讀取數據達到一定數量時進行操作，並清空內存空間

package com.alibaba.easyexcel.test.temp.read;

import java.util.Map;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.alibaba.excel.context.AnalysisContext;
import com.alibaba.excel.event.AnalysisEventListener;
import com.alibaba.excel.metadata.CellData;
import com.alibaba.fastjson.JSON;

/**
 * 模板的讀取類
 *
 * @author
 */
public class HDListener extends AnalysisEventListener<HeadReadData> {
    private static final Logger LOGGER = LoggerFactory.getLogger(HDListener.class);
    /**
     * 每隔5條存儲數據庫，實際使用中可以3000條，然後清理list ，方便內存回收
     */
    private static final int BATCH_COUNT = 5;

    @Override
    public void invokeHeadMap(Map<Integer, String> headMap, AnalysisContext context) {
        LOGGER.info("HEAD:{}", JSON.toJSONString(headMap));
        LOGGER.info("total:{}", context.readSheetHolder().getTotal());

    }

    @Override
    public void invoke(HeadReadData data, AnalysisContext context) {
        LOGGER.info("index:{}", context.readRowHolder().getRowIndex());
        LOGGER.info("解析到一條數據:{}", JSON.toJSONString(data));
    }

    @Override
    public void doAfterAllAnalysed(AnalysisContext context) {
        LOGGER.info("所有數據解析完成！");
    }

}

2、編寫讀取excel文件的對象，會根據該對象進行數據封裝返回

package com.alibaba.easyexcel.test.temp.read;

import com.alibaba.excel.annotation.ExcelProperty;
import lombok.Data;
import lombok.experimental.Accessors;

/**
 * 臨時測試
 *
 * @author
 **/
@Data
@Accessors(chain = true)
public class HeadReadData {
    @ExcelProperty("頭1")
    private String h1;
    @ExcelProperty({"頭", "頭2"})
    private String h2;
}

3、創建easyexcel讀取對象讀取文件內容

package com.alibaba.easyexcel.test.temp.read;

import java.io.File;

import org.junit.Ignore;
import org.junit.Test;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.alibaba.excel.EasyExcel;
import com.alibaba.excel.cache.Ehcache;

/**
 * 臨時測試
 *
 * @author
 **/
@Ignore
public class HeadReadTest {
    private static final Logger LOGGER = LoggerFactory.getLogger(HeadReadTest.class);

    @Test
    public void test() throws Exception {
        File file = new File("D:\\test\\headt1.xls");
        EasyExcel.read(file, HeadReadData.class, new HDListener()).sheet(0).doRead();

    }
}