如何在Java EasyExcel中设置列宽和行高

1. 流程概述

首先我们需要创建一个ExcelWriter对象，然后设置列宽和行高，最后写入数据到Excel中。

2. 步骤及代码示例

步骤一：导入相关包

import com.alibaba.excel.EasyExcel;
import com.alibaba.excel.write.builder.ExcelWriterBuilder;
import com.alibaba.excel.write.metadata.style.WriteCellStyle;
import com.alibaba.excel.write.metadata.style.WriteFont;

步骤二：创建ExcelWriter对象

ExcelWriterBuilder excelWriterBuilder = EasyExcel.write("文件路径.xlsx").build();

步骤三：设置列宽

excelWriterBuilder.headWidth(20); // 设置标题行列宽
excelWriterBuilder.registerWriteHandler(new LongestMatchColumnWidthStyleStrategy()); // 设置自适应列宽

步骤四：设置行高

WriteCellStyle headWriteCellStyle = new WriteCellStyle();
headWriteCellStyle.setWrapped(true); // 设置自动换行
WriteFont headWriteFont = new WriteFont();
headWriteFont.setFontHeightInPoints((short) 20); // 设置字体大小
headWriteCellStyle.setWriteFont(headWriteFont);
excelWriterBuilder.registerWriteHandler(new CustomCellWriteHandler(headWriteCellStyle));

步骤五：写入数据到Excel

excelWriterBuilder.sheet().doWrite(dataList);

3. 完整示例

import com.alibaba.excel.EasyExcel;
import com.alibaba.excel.write.builder.ExcelWriterBuilder;
import com.alibaba.excel.write.metadata.style.WriteCellStyle;
import com.alibaba.excel.write.metadata.style.WriteFont;

public class ExcelUtils {

    public void writeExcel(List<Object> dataList) {
        ExcelWriterBuilder excelWriterBuilder = EasyExcel.write("文件路径.xlsx").build();

        excelWriterBuilder.headWidth(20);
        excelWriterBuilder.registerWriteHandler(new LongestMatchColumnWidthStyleStrategy());

        WriteCellStyle headWriteCellStyle = new WriteCellStyle();
        headWriteCellStyle.setWrapped(true);
        WriteFont headWriteFont = new WriteFont();
        headWriteFont.setFontHeightInPoints((short) 20);
        headWriteCellStyle.setWriteFont(headWriteFont);
        excelWriterBuilder.registerWriteHandler(new CustomCellWriteHandler(headWriteCellStyle));

        excelWriterBuilder.sheet().doWrite(dataList);
    }
}

4. 序列图示意

sequenceDiagram
    participant 开发者
    participant 小白

    小白->>开发者: 请求学习如何设置列宽行高
    开发者->>小白: 说明整体流程及代码示例
    小白->>开发者: 导入相关包
    小白->>开发者: 创建ExcelWriter对象
    小白->>开发者: 设置列宽和行高
    小白->>开发者: 写入数据到Excel
    开发者->>小白: 帮助完毕

通过以上步骤和代码示例，你应该可以很好地实现在Java EasyExcel中设置列宽和行高了。如果有任何疑问，欢迎随时向我提问。祝你学习顺利！