EasyExcel设置表头和内容样式

方法实现：通过继承接口实现EasyExcel的registerWriteHandler方法实现自定义样式，表头和内容都适用，这里只有表头代码

实体类

package cn.xwl.easyexcel.dto;

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

import java.io.Serializable;

@Data
public class User  implements Serializable {
	
    private static final long serialVersionUID = 1602341773222025686L;

    @ExcelProperty(index = 0, value = {"姓名"})
    private String name;
    
    @ExcelProperty(index = 1, value = {"年龄"})
    private Integer age;
    
    @ExcelProperty(index = 2, value = {"家庭地址"})
    private String address;


    


}

controller

    @GetMapping("/download")
    public void importPrisonerDownload(HttpServletResponse response) throws Exception {
        try{
            String fileName = URLEncoder.encode("用户信息", "UTF-8").replaceAll("\\+", "%20");
            response.setContentType("application/vnd.ms-excel");
            response.setCharacterEncoding("utf-8");
            response.setHeader("Content-disposition", "attachment;filename*=utf-8''" + fileName + ".xlsx");//设置响应头
            response.setHeader("mime","application/vnd.ms-excel");
            List<User> lst =  new ArrayList<>();//空数组作为导入模板 可以再写一个方法给数组赋值作为导出模板

            //表头字体颜色map 1为user中索引位置
            Map<Integer,Short> colorMap=new HashMap<>();
            colorMap.put(1, IndexedColors.BLUE.index);

            EasyExcel.write(response.getOutputStream(), User.class)
                    .registerWriteHandler(new XCellStyle(colorMap))
                    .sheet("User")
                    .doWrite(lst);
        }catch (Exception e){
            e.printStackTrace();
        }
    }

工具类

package cn.xwl.easyexcel.util;

import com.alibaba.excel.metadata.Head;
import com.alibaba.excel.write.metadata.style.WriteCellStyle;
import com.alibaba.excel.write.metadata.style.WriteFont;
import com.alibaba.excel.write.style.AbstractVerticalCellStyleStrategy;
import org.apache.poi.ss.usermodel.IndexedColors;

import java.util.HashMap;
import java.util.Map;

/*
  EasyExcel 表格样式工具类
*/
public class XCellStyle extends AbstractVerticalCellStyleStrategy {

    //key为ExcelProperty value为颜色
    public Map<Integer,Short> colorMap=new HashMap<>();

    public XCellStyle(Map<Integer,Short> colorMap){
        this.colorMap=colorMap;
    }

    //表格头样式
    @Override
    protected WriteCellStyle headCellStyle(Head head) {
        WriteCellStyle writeCellStyle=new WriteCellStyle();
        WriteFont font=new WriteFont();
        
        //自定义字体颜色
        for(Integer key:colorMap.keySet()){
            if(head.getColumnIndex()==key){
                font.setColor(colorMap.get(key));
                break;
            }else {
                font.setColor(IndexedColors.BLACK.index);//默认颜色
            }
        }

		//有兴趣可以自己定义别的这里只定义了color

        writeCellStyle.setWriteFont(font);
        return writeCellStyle;
    }


    //单元格格内样式 写法与上面类似
    @Override
    protected WriteCellStyle contentCellStyle(Head head) {
        return null;
    }
}