Java使用EasyExcel实现高效的Excel读写操作

<dependency>
    <groupId>com.alibaba</groupId>
    <artifactId>easyexcel</artifactId>
    <version>4.0.3</version> <!-- 请使用最新版本 -->
</dependency>

import com.alibaba.excel.EasyExcel;
 
import java.util.ArrayList;
import java.util.List;
 
public class EasyExcelWriteExample {
 
    public static void main(String[] args) {
        String fileName = "example.xlsx";
 
        // 准备数据
        List<UserData> data = generateData();
 
        // 写入文件
        EasyExcel.write(fileName, UserData.class)
                .sheet("用户信息")
                .doWrite(data);
    }
 
    private static List<UserData> generateData() {
        List<UserData> list = new ArrayList<>();
        for (int i = 1; i <= 10; i++) {
            list.add(new UserData(i, "用户" + i, "user" + i + "@example.com"));
        }
        return list;
    }
 
    // 数据类，使用注解指定表头
    public static class UserData {
        @com.alibaba.excel.annotation.ExcelProperty("用户ID")
        private Integer id;
 
        @com.alibaba.excel.annotation.ExcelProperty("用户名")
        private String name;
 
        @com.alibaba.excel.annotation.ExcelProperty("邮箱")
        private String email;
 
        // 构造函数、Getter 和 Setter
        public UserData(Integer id, String name, String email) {
            this.id = id;
            this.name = name;
            this.email = email;
        }
    }
}

import com.alibaba.excel.EasyExcel;
import com.alibaba.excel.context.AnalysisContext;
import com.alibaba.excel.read.listener.ReadListener;
 
import java.util.List;
 
public class EasyExcelReadExample {
 
    public static void main(String[] args) {
        String fileName = "example.xlsx";
 
        // 读取文件
        EasyExcel.read(fileName, UserData.class, new UserDataListener())
                .sheet()
                .doRead();
    }
 
    // 自定义监听器，处理每一行数据
    public static class UserDataListener implements ReadListener<UserData> {
        @Override
        public void invoke(UserData data, AnalysisContext context) {
            System.out.println("读取到数据：" + data);
        }
 
        @Override
        public void doAfterAllAnalysed(AnalysisContext context) {
            System.out.println("所有数据读取完毕");
        }
    }
}

public class MultiLevelData {
    @com.alibaba.excel.annotation.ExcelProperty({"用户信息", "用户ID"})
    private Integer id;
 
    @com.alibaba.excel.annotation.ExcelProperty({"用户信息", "用户名"})
    private String name;
 
    @com.alibaba.excel.annotation.ExcelProperty({"联系方式", "邮箱"})
    private String email;
}

EasyExcel.read(fileName, UserData.class, new ReadListener<UserData>() {
    @Override
    public void invoke(UserData data, AnalysisContext context) {
        // 处理每一条数据
    }
 
    @Override
    public void doAfterAllAnalysed(AnalysisContext context) {
        // 处理完成后执行
    }
}).sheet().doRead();