前言
excel导出有高亮单元格的需求，本文介绍EaxyExcel高亮单元格的方法
效果
高亮的单元格，字体也设为红色
实现
先引入EasyExcel和Guava工具类，还有lombok
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>easyexcel</artifactId>
<version>2.2.7</version>
</dependency>
<dependency>
<groupId>com.google.guava</groupId>
<artifactId>guava</artifactId>
<version>30.1-jre</version>
</dependency>
<!-- springboot test启动器 -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
</dependency>
<!-- Lombok -->
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<optional>true</optional>
</dependency>
对单元格的样式进行指定，要实现CellWriteHandler接口，并在afterCellDispose进行相关操作。灵活使用EasyExcel的WriteHandler接口，可以实现下拉框，高亮等需求。
import com.alibaba.excel.metadata.CellData;
import com.alibaba.excel.metadata.Head;
import com.alibaba.excel.util.StyleUtil;
import com.alibaba.excel.write.handler.CellWriteHandler;
import com.alibaba.excel.write.metadata.holder.WriteSheetHolder;
import com.alibaba.excel.write.metadata.holder.WriteTableHolder;
import com.alibaba.excel.write.metadata.style.WriteCellStyle;
import com.alibaba.excel.write.metadata.style.WriteFont;
import org.apache.poi.ss.usermodel.*;
import java.util.HashMap;
import java.util.List;
/**
* https://blog.csdn.net/scholartang/article/details/108024953
*
* @date 01/22/2021 15:46
*/
public class CellColorCellWriteHandler implements CellWriteHandler {
/**
* map
* key：第i行
* value：第i行中单元格索引集合
*/
private HashMap<Integer, List<Integer>> map;
/**
* 颜色
*/
private Short colorIndex;
/**
* 无参构造
*/
public CellColorCellWriteHandler() {
}
/**
* 有参构造
*/
public CellColorCellWriteHandler(HashMap<Integer, List<Integer>> map, Short colorIndex) {
this.map = map;
this.colorIndex = colorIndex;
}
/**
* 在创建单元格之前调用
*/
@Override
public void beforeCellCreate(WriteSheetHolder writeSheetHolder, WriteTableHolder writeTableHolder, Row row, Head head, Integer columnIndex, Integer relativeRowIndex, Boolean isHead) {
}
/**
* 在单元格创建后调用
*/
@Override
public void afterCellCreate(WriteSheetHolder writeSheetHolder, WriteTableHolder writeTableHolder, Cell cell, Head head, Integer relativeRowIndex, Boolean isHead) {
}
@Override
public void afterCellDataConverted(WriteSheetHolder writeSheetHolder, WriteTableHolder writeTableHolder, CellData cellData, Cell cell, Head head, Integer integer, Boolean aBoolean) {
}
/**
* 在单元上的所有操作完成后调用
*/
@Override
public void afterCellDispose(WriteSheetHolder writeSheetHolder, WriteTableHolder writeTableHolder, List<CellData> cellDataList, Cell cell, Head head, Integer relativeRowIndex, Boolean isHead) {
/*
* 考虑到导出数据量过大的情况，不对每一行的每一个单元格进行样式设置，只设置必要行中的某个单元格的样式
*/
//当前行的第i列
int i = cell.getColumnIndex();
//不处理第一行
List<Integer> integers = map.get(cell.getRowIndex());
if (integers != null && integers.size() > 0) {
if (integers.contains(i)) {
// 根据单元格获取workbook
Workbook workbook = cell.getSheet().getWorkbook();
//设置行高
writeSheetHolder.getSheet().getRow(cell.getRowIndex()).setHeight((short) (1.4 * 256));
// 单元格策略
WriteCellStyle contentWriteCellStyle = new WriteCellStyle();
// 设置背景颜色白色
contentWriteCellStyle.setFillForegroundColor(IndexedColors.WHITE.getIndex());
// 设置垂直居中为居中对齐
contentWriteCellStyle.setVerticalAlignment(VerticalAlignment.CENTER);
// 设置左右对齐为靠左对齐
contentWriteCellStyle.setHorizontalAlignment(HorizontalAlignment.LEFT);
// 设置单元格上下左右边框为细边框
contentWriteCellStyle.setBorderBottom(BorderStyle.MEDIUM);
contentWriteCellStyle.setBorderLeft(BorderStyle.MEDIUM);
contentWriteCellStyle.setBorderRight(BorderStyle.MEDIUM);
contentWriteCellStyle.setBorderTop(BorderStyle.MEDIUM);
// 创建字体实例
WriteFont cellWriteFont = new WriteFont();
// 设置字体大小
cellWriteFont.setFontName("宋体");
cellWriteFont.setFontHeightInPoints((short) 14);
//设置字体颜色，此处用红色
cellWriteFont.setColor(IndexedColors.RED.getIndex());
//单元格颜色，被高亮的单元格颜色
contentWriteCellStyle.setFillForegroundColor(colorIndex);
contentWriteCellStyle.setWriteFont(cellWriteFont);
CellStyle cellStyle = StyleUtil.buildHeadCellStyle(workbook, contentWriteCellStyle);
//设置当前行第i列的样式
cell.getRow().getCell(i).setCellStyle(cellStyle);
}
}
}
}
单元测试
定义Person类
import com.alibaba.excel.annotation.ExcelIgnore;
import com.alibaba.excel.annotation.ExcelProperty;
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
/**
* @date 01/24/2021 22:16
*/
@Data
@AllArgsConstructor
@NoArgsConstructor
public class Person {
@ExcelProperty("姓名")
private String name;
@ExcelProperty("性别")
private String gender;
@ExcelProperty("年龄")
private Integer age;
@ExcelProperty("爱好")
private String hobby;
@ExcelProperty("城市")
private String city;
@ExcelIgnore
private String status;
}
测试
/**
* EasyExcel设置行中单个单元格的样式，如高亮单元格
* <p>
* https://blog.csdn.net/scholartang/article/details/108024953
*
* @date 01/22/2021 15:46
*/
public class Demo4ForCSDN {
@Test
public void test() throws FileNotFoundException {
// 文件输出位置
OutputStream out = new FileOutputStream("/Users/quanlinglong/Downloads/mergeDemo/demo" + System.currentTimeMillis() + ".xlsx");
// 指定要高亮的单元格
//用来记录需要为第`key`行中的第`value.get(i)`列设置样式
HashMap<Integer, List<Integer>> map = new HashMap<>();
// 第1行，第2，5列的格子高亮
map.put(1, Arrays.asList(2, 5));
map.put(2, Arrays.asList(1, 2, 4));
map.put(4, Arrays.asList(1, 2, 4));
//指定单元格样式,通过有残构造，指定填充的颜色
CellColorCellWriteHandler writeHandler = new CellColorCellWriteHandler(map, IndexedColors.YELLOW1.getIndex());
ExcelWriter excelWriter = null;
try {
excelWriter = EasyExcel
.write(out, Person.class) // Person指定了表头
.registerWriteHandler(defaultStyles())
.registerWriteHandler(writeHandler) // 注意优先级，后面的writeHandler会覆盖前面的样式
.build();
WriteSheet writeSheet = EasyExcel.writerSheet("模板").build();
// 第一个参数传List，泛型可以是person实例或者一个List
// excelWriter.write(personData(), writeSheet);
// 如果泛型是List，就失去隐藏表头的功能，所有字段都写到excel
excelWriter.write(listData(), writeSheet);
} finally {
if (excelWriter != null) {
excelWriter.finish();
}
}
}
private List<List<Object>> listData() {
List<List<Object>> lists = new ArrayList<>();
lists.add(Lists.newArrayList("张三","男",20,"游泳","北京","单身"));
lists.add(Lists.newArrayList("李四","男",20,"游泳","北京","单身"));
lists.add(Lists.newArrayList("王五","男",20,"游泳","北京","单身"));
lists.add(Lists.newArrayList("赵薇","女",25,"游泳","北京","单身","明星"));
return lists;
}
private List<Person> personData() {
ArrayList<Person> people = new ArrayList<>();
people.add(new Person("张三","男",20,"游泳","北京","单身"));
people.add(new Person("李四","男",20,"游泳","北京","单身"));
people.add(new Person("王五","男",20,"游泳","北京","单身"));
people.add(new Person("赵薇","女",25,"游泳","北京","单身"));
return people;
}
/**
* 默认样式
*/
public static HorizontalCellStyleStrategy defaultStyles() {
//默认样式
//表头样式策略
WriteCellStyle headWriteCellStyle = new WriteCellStyle();
//设置表头居中对齐
headWriteCellStyle.setHorizontalAlignment(HorizontalAlignment.CENTER);
//表头前景设置淡蓝色
headWriteCellStyle.setFillForegroundColor(IndexedColors.PALE_BLUE.getIndex());
WriteFont headWriteFont = new WriteFont();
headWriteFont.setBold(true);
headWriteFont.setFontName("宋体");
headWriteFont.setFontHeightInPoints((short) 12);
headWriteCellStyle.setWriteFont(headWriteFont);
//内容样式策略策略
WriteCellStyle contentWriteCellStyle = new WriteCellStyle();
// 设置背景颜色白色
// contentWriteCellStyle.setFillForegroundColor(IndexedColors.WHITE.getIndex());
// 设置垂直居中为居中对齐
contentWriteCellStyle.setVerticalAlignment(VerticalAlignment.CENTER);
// 设置左右对齐为靠左对齐
contentWriteCellStyle.setHorizontalAlignment(HorizontalAlignment.LEFT);
// 设置单元格上下左右边框为细边框
contentWriteCellStyle.setBorderBottom(BorderStyle.MEDIUM);
contentWriteCellStyle.setBorderLeft(BorderStyle.MEDIUM);
contentWriteCellStyle.setBorderRight(BorderStyle.MEDIUM);
contentWriteCellStyle.setBorderTop(BorderStyle.MEDIUM);
//创建字体对象
WriteFont contentWriteFont = new WriteFont();
//内容字体大小
contentWriteFont.setFontName("宋体");
contentWriteFont.setFontHeightInPoints((short) 14);
contentWriteCellStyle.setWriteFont(contentWriteFont);
// 初始化表格样式
return new HorizontalCellStyleStrategy(headWriteCellStyle, contentWriteCellStyle);
}
}
希望对你有用
相关资料：
EasyExcel设置行中单个单元格的样式