excel大数据量插入-easyexcel解析插入

pom:

<dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>easyexcel</artifactId>
            <version>3.0.5</version>
        </dependency>

ExcelTestListener:

package com.sdkj.exceltest.listener.excel;

import com.alibaba.excel.context.AnalysisContext;
import com.alibaba.excel.event.AnalysisEventListener;
import com.sdkj.exceltest.entity.ExcelTest;
import com.sdkj.exceltest.service.ExcelTestService;

import java.util.ArrayList;
import java.util.List;

public class ExcelTestListener extends AnalysisEventListener<ExcelTest> {

    List<ExcelTest> list = new ArrayList<>();

    private ExcelTestService excelTestService;

    public ExcelTestListener() {

    }

    public ExcelTestListener(ExcelTestService excelTestService) {
        this.excelTestService = excelTestService;
    }

    @Override
    public void invoke(ExcelTest excelTest, AnalysisContext context) {
        list.add(excelTest);
        // 可以设置超过500条了，需要去存储一次数据库，防止数据几万条数据在内存，容易OOM
        if (list.size() >= 1000) {
            saveData();
            // 存储完成清理 list
            list.clear();
        }
    }

    /**
     * 所有数据解析完成,进行调用
     */
    @Override
    public void doAfterAllAnalysed(AnalysisContext context) {
        saveData();
    }

    /**
     * 加上存储数据库
     */
    private void saveData() {
        //excelTestService.batchAdd(list);
    }

}

ExcelTest:

package com.sdkj.exceltest.entity;

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

import java.io.Serializable;

@Data
public class ExcelTest implements Serializable {

    @ExcelProperty("ID")
    private String id;

    @ExcelProperty("JGMC")
    private String jgmc;

    @ExcelProperty("GMC")
    private String gmc;


}

test:

@Autowired
    private ExcelTestService excelTestService;

    @Test
    void contextLoads() {
    }

    @Test
    public void test() {
        String fileName = "D://test001.xlsx";

        // 这里 需要指定读用哪个class去读，然后读取第一个sheet 文件流会自动关闭
        /**
         * 参数1 要读取的文件
         * 参数2 要读取的数据对应的实体类类对象
         * 参数3 监听器对象 可以在创建的时候把dao当做参数传进去
         */

        long start, end;
        start = System.currentTimeMillis();

        EasyExcel.read(fileName, ExcelTest.class, new ExcelTestListener(excelTestService)).sheet().doRead();

        end = System.currentTimeMillis();
        System.out.println("start time:" + start + "; end time:" + end + "; Run Time:" + (end - start) + "(ms)");

    }