android

android easyexcel如何导出数据

小樊
81
2024-12-02 19:43:03
栏目: 编程语言

EasyExcel是一个用于Android平台的简单易用的Excel导出库。要使用EasyExcel导出数据,请按照以下步骤操作:

  1. 首先,在项目的build.gradle文件中添加EasyExcel的依赖项:
dependencies {
    implementation 'com.alibaba:easyexcel:2.2.10'
}
  1. 创建一个实体类(例如:User.java),该类将用于表示要导出的数据。使用@ExcelProperty注解来映射Excel表格中的列名和数据。
import com.alibaba.excel.annotation.ExcelProperty;

public class User {
    @ExcelProperty("姓名")
    private String name;

    @ExcelProperty("年龄")
    private Integer age;

    // 省略getter和setter方法
}
  1. 创建一个实现IOpenSheetWriter接口的类(例如:UserSheetWriter.java),用于自定义导出逻辑。
import com.alibaba.excel.write.metadata.style.WriteCellStyle;
import com.alibaba.excel.write.metadata.style.WriteFont;
import com.alibaba.excel.write.style.AbstractCellStyleStrategy;
import com.alibaba.excel.write.style.HorizontalCellStyleStrategy;
import com.alibaba.excel.write.style.VerticalCellStyleStrategy;
import com.alibaba.excel.write.writer.AbstractExcelWriter;
import com.alibaba.excel.write.writer.ExcelWriter;
import org.apache.poi.ss.usermodel.*;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;

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

public class UserSheetWriter extends AbstractCellStyleStrategy {

    private List<User> userList = new ArrayList<>();
    private WriteCellStyle headCellStyle;
    private WriteCellStyle contentCellStyle;

    public UserSheetWriter() {
        // 初始化样式
        initStyles();
    }

    private void initStyles() {
        Workbook workbook = new XSSFWorkbook();
        Sheet sheet = workbook.createSheet("用户表");

        // 创建表头样式
        CreationHelper createHelper = workbook.getCreationHelper();
        WriteFont headWriteFont = createHelper.createFont();
        headWriteFont.setBold(true);
        headWriteFont.setFontName("Arial");
        headWriteFont.setFontHeightInPoints((short) 12);

        headCellStyle = workbook.createCellStyle();
        headCellStyle.setFillForegroundColor(IndexedColors.YELLOW.getIndex());
        headCellStyle.setFillPattern(FillPatternType.SOLID_FOREGROUND);
        headCellStyle.setFont(headWriteFont);

        // 创建内容样式
        WriteFont contentWriteFont = createHelper.createFont();
        contentWriteFont.setFontName("Arial");
        contentWriteFont.setFontHeightInPoints((short) 10);

        contentCellStyle = workbook.createCellStyle();
        contentCellStyle.setFont(contentWriteFont);
    }

    @Override
    protected void initCellStyle(AbstractExcelWriter writer, WriteSheet writeSheet) {
        // 这里可以设置表头和内容单元格的样式,如果不需要自定义样式,可以不重写此方法
    }

    @Override
    protected void writeHeadRow(AbstractExcelWriter writer, WriteSheet writeSheet) {
        Row headRow = writeSheet.createRow(0);
        for (int i = 0; i < User.class.getDeclaredFields().length; i++) {
            Cell cell = headRow.createCell(i);
            cell.setCellValue(User.class.getDeclaredFields()[i].getName());
            cell.setCellStyle(headCellStyle);
        }
    }

    @Override
    protected void writeRow(AbstractExcelWriter writer, WriteSheet writeSheet, Row row, Object data) {
        User user = (User) data;
        for (int i = 0; i < user.getClass().getDeclaredFields().length; i++) {
            Cell cell = row.createCell(i);
            cell.setCellValue(user.getClass().getDeclaredFields()[i].getName() + ": " + user.getClass().getDeclaredFields()[i].get(user));
            cell.setCellStyle(contentCellStyle);
        }
    }

    public List<User> getUserList() {
        return userList;
    }

    public void setUserList(List<User> userList) {
        this.userList = userList;
    }
}
  1. 在需要导出数据的地方(例如:Activity或Fragment),创建一个UserSheetWriter实例,并将数据添加到userList中。然后使用EasyExcel.write()方法导出Excel文件。
import com.alibaba.excel.EasyExcel;

public class ExportActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_export);

        // 创建数据
        List<User> userList = new ArrayList<>();
        userList.add(new User("张三", 25));
        userList.add(new User("李四", 30));
        userList.add(new User("王五", 28));

        // 创建UserSheetWriter实例
        UserSheetWriter userSheetWriter = new UserSheetWriter();
        userSheetWriter.setUserList(userList);

        // 导出Excel文件
        String fileName = "用户数据.xlsx";
        EasyExcel.write(fileName).registerWriteHandler(userSheetWriter).sheet("用户表").doWrite(userList);
    }
}

这样,当运行应用程序时,将会导出一个名为"用户数据.xlsx"的Excel文件,其中包含从userList中获取的数据。

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