easyExcel-读取Excel

1、简单读取，没有合并单元格

1.1、引入pom文件

javascript 复制代码

        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>fastjson</artifactId>
            <version>1.2.83</version>
        </dependency>
        
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>easyexcel</artifactId>
            <version>3.1.3</version>
        </dependency>
        
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <version>1.18.24</version>
        </dependency>

1.2、Excel读取

1.3、测试代码

javascript 复制代码

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

@Data
public class userDTo {

    @ExcelProperty(value = "姓名")
    private String name;


    @ExcelProperty(value = "年龄")
    private String age;

    /**
     * 项目名称
     */
    @ExcelProperty(value = "工号")
    private String workNo;

    @ExcelProperty(value = "部门")
    private String dept;

}

javascript 复制代码

    @Test
    void contextLoads() {

        File file = new File("D:\\maven_workplace\\BootProject_test\\boot-project-test\\EasyExcel-test\\src\\main\\resources\\测试.xls");
        Class<userDTo> userDToClass = userDTo.class;
        EasyExcel.read(file, userDToClass, new AnalysisEventListener<userDTo>() {

            @Override
            public void invoke(userDTo userDTo, AnalysisContext analysisContext) {
                //一条一条数据进解析
                System.out.println("数据解析---->"+userDTo);
            }

            //所有的数据都解析完之后执行
            @Override
            public void doAfterAllAnalysed(AnalysisContext analysisContext) {

            }
        }).sheet().headRowNumber(1).doRead();
    }

// sheet 从0 开始（默认）
//headRowNumber 标题

1.4、结果

2、复杂读取，合并单元格 -数据嵌套

2.1、读取Excel格式

2.2、测试代码

javascript 复制代码

import com.alibaba.excel.EasyExcel;
import com.alibaba.excel.context.AnalysisContext;
import com.alibaba.excel.event.AnalysisEventListener;
import com.example.easyexceltest.pojo.userDTo;
import org.junit.jupiter.api.Test;
import org.springframework.boot.test.context.SpringBootTest;

import java.io.File;

@SpringBootTest
class EasyExcelTestApplicationTests {

    @Test
    void contextLoads() {

        File file = new File("D:\\maven_workplace\\BootProject_test\\boot-project-test\\EasyExcel-test\\src\\main\\resources\\测试.xls");
        Class<userDTo> userDToClass = userDTo.class;
        EasyExcel.read(file, userDToClass, new AnalysisEventListener<userDTo>() {

            @Override
            public void invoke(userDTo userDTo, AnalysisContext analysisContext) {
                //一条一条数据进解析
                System.out.println("数据解析---->"+userDTo);
            }

            //所有的数据都解析完之后执行
            @Override
            public void doAfterAllAnalysed(AnalysisContext analysisContext) {
                System.out.println("数据解析结束");
            }
        }).sheet().headRowNumber(1).doRead();
    }

}

2.3、测试结果

发现使用刚刚的方法已经，合并之后并不能够正常读取数据。只能读合并之后 第一行 数据。

解决办法：

1、实体类：

javascript 复制代码

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

import java.util.List;
import java.util.Map;

@Data
public class userDTo {

    @ExcelProperty(value = "姓名")
    private String name;


    @ExcelProperty(value = "年龄")
    private String age;

    /**
     * 项目名称
     */
    @ExcelProperty(value = "工号")
    private String workNo;

// 把 要从Excel 读取的字段都要写，即使部门要封装到list中
    @ExcelProperty(value = "部门")
    private String dept;

    // 忽略该字段
    @ExcelIgnore
    private List<Map<String,String>> deptMap;
    
    @ExcelIgnore
    private List<Dept> deptList;

}

javascript 复制代码

@Data
public class Dept {
    private String dept;
}

2、测试代码：

javascript 复制代码

import com.alibaba.excel.EasyExcel;
import com.alibaba.excel.context.AnalysisContext;
import com.alibaba.excel.event.AnalysisEventListener;
import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.example.easyexceltest.pojo.Dept;
import com.example.easyexceltest.pojo.userDTo;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang3.StringUtils;
import org.junit.jupiter.api.Test;
import org.springframework.boot.test.context.SpringBootTest;

import java.io.File;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

@SpringBootTest
@Slf4j
class EasyExcelTestApplicationTests {

    @Test
    void contextLoads() {

        File file = new File("D:\\maven_workplace\\BootProject_test\\boot-project-test\\EasyExcel-test\\src\\main\\resources\\测试.xls");
        Class<userDTo> userDToClass = userDTo.class;
        List<userDTo> deptsInfo = new ArrayList<>();
        EasyExcel.read(file, userDToClass, new AnalysisEventListener<userDTo>() {

            @Override
            public void invoke(userDTo userDTo, AnalysisContext analysisContext) {
                //一条一条数据进解析
                System.out.println("数据解析---->"+userDTo);
                deptsInfo.add(userDTo);
            }

            //所有的数据都解析完之后执行
            @Override
            public void doAfterAllAnalysed(AnalysisContext analysisContext) {
                System.out.println("数据解析结束");
                importCustomer(deptsInfo);
            }
        }).sheet().headRowNumber(1).doRead();
    }


    public void importCustomer(List<userDTo> list) {
        // 待保存到数据库的数据
        List<userDTo> data = new ArrayList<>();
        userDTo customer = new userDTo();
        List<Map<String, String>> contactsList = new ArrayList<>();

        for (userDTo obj : list) {
            // 判断用户名是否为空，
            if (StringUtils.isNotBlank(obj.getName())) {
                //信息列表是否有数据，如果有则要把数据保存起来
                if (contactsList.size() != 0) {
                    customer.setDeptMap(contactsList);
                    data.add(customer);
                }
                //重置对象
                customer = new userDTo();
                contactsList = new ArrayList<>();
                customer.setName(obj.getName());
                customer.setAge(obj.getAge());
                customer.setWorkNo(obj.getWorkNo());

                //一个list嵌套写一个map,如果有两个需要写两个map
                Map map = new HashMap();
                map.put("dept", obj.getDept());
                contactsList.add(map);
            } else {
                Map map = new HashMap();
                map.put("dept", obj.getDept());
                contactsList.add(map);
            }
        }

        // 保存最后一条数据
        if (contactsList.size() != 0) {
            customer.setDeptMap(contactsList);
            data.add(customer);
        }
        System.out.println(data.toString());

        System.out.println("----------------==");
        for (userDTo user : data) {
            List<Map<String, String>> issrInfo = user.getDeptMap();
            ArrayList<Dept> depts = new ArrayList<>();
            for (Map<String, String> map : issrInfo) {
//               map 转成 ArrIssExcelDto.class;
                Dept dept = JSONObject.parseObject(JSON.toJSONString(map), Dept.class);
                depts.add(dept);
            }
            System.out.println(">>>>>>>>>>>>>>>>>>>>将map数据封装到list中");
            System.out.println(depts);
            user.setDeptList(depts);
            System.out.println(">>>>>>>>>>>>>>>>>>>>>>>>>>");
        }
       log.info("---读取data数据为：{}" , JSONObject.toJSONString(data));
    }

}

3、结果：