闭着眼都能学会的Excel导出 新手教程版 --- java

• • • 导入依赖
    • controller 层
    • Service层
    • ServiceImpl层
    • ExcelUtils
  • 前端
  • • 效果

首先将EasyExcel依赖导入项目中

        
        
            com.alibaba
            easyexcel
            2.2.6
        

然后复制一下代码。有些地方根据自己需求进行改动

@GetMapping("/export")
public void export(HttpServletResponse resp) throws IOException {
    orderHandleService.export(resp);
}

    
   void export(HttpServletResponse resp) throws IOException;

   
    @Override
    public void export(HttpServletResponse resp) {
        try {
        
           // LambdaQueryWrapper queryWrapper = queryConditions(orderHandleDTO);
           // List orderEntities = order.selectList(queryWrapper);
       
            //第三个参数是导出后文件名称，后面的 class 是根据你查出来的数据类型 
            ExcelUtils.writeExcel(resp, orderEntities, "物流信息记录", "物流信息", OrderEntity.class);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

package com.boailian.excelhander.util;

import com.alibaba.excel.EasyExcel;
import com.alibaba.excel.support.ExcelTypeEnum;
import com.alibaba.excel.write.metadata.style.WriteCellStyle;
import com.alibaba.excel.write.metadata.style.WriteFont;
import com.alibaba.excel.write.style.HorizontalCellStyleStrategy;
import com.alibaba.excel.write.style.column.LongestMatchColumnWidthStyleStrategy;
import org.apache.poi.ss.usermodel.HorizontalAlignment;
import org.apache.poi.ss.usermodel.IndexedColors;
import org.springframework.stereotype.Component;

import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.OutputStream;
import java.net.URLEncoder;
import java.util.HashSet;
import java.util.List;
import java.util.Set;


@Component
public class ExcelUtils {

    

    public static void writeExcel(HttpServletResponse response, List data, String fileName,String sheetName, Class model) throws Exception {
        // 头的策略
        WriteCellStyle headWriteCellStyle = new WriteCellStyle();
        //设置表头居中对齐
        headWriteCellStyle.setHorizontalAlignment(HorizontalAlignment.CENTER);
        // 颜色
        headWriteCellStyle.setFillForegroundColor(IndexedColors.PALE_BLUE.getIndex());
        WriteFont headWriteFont = new WriteFont();
        headWriteFont.setFontHeightInPoints((short) 10);
        // 字体
        headWriteCellStyle.setWriteFont(headWriteFont);
        headWriteCellStyle.setWrapped(true);
        // 内容的策略
        WriteCellStyle contentWriteCellStyle = new WriteCellStyle();

        Set excludeColumnFiledNames = ExcelIgnore();
        //设置内容靠中对齐
        contentWriteCellStyle.setHorizontalAlignment(HorizontalAlignment.CENTER);
        // 这个策略是 头是头的样式 内容是内容的样式 其他的策略可以自己实现
        HorizontalCellStyleStrategy horizontalCellStyleStrategy = new HorizontalCellStyleStrategy(headWriteCellStyle, contentWriteCellStyle);
        // 这里 需要指定写用哪个class去写，然后写到第一个sheet，名字为模板 然后文件流会自动关闭
        EasyExcel.write(getOutputStream(fileName, response), model).excelType(ExcelTypeEnum.XLSX).sheet(sheetName).registerWriteHandler(horizontalCellStyleStrategy)
                //最大长度自适应 目前没有对应算法优化 建议注释掉不用 会出bug
                .registerWriteHandler(new LongestMatchColumnWidthStyleStrategy())
                .excludeColumnFiledNames(excludeColumnFiledNames)
                .doWrite(data);

    }
    
    private static Set ExcelIgnore() {
        // 去掉不需要的字段
        Set excludeColumnFiledNames = new HashSet();
        excludeColumnFiledNames.add("isnotify");
        excludeColumnFiledNames.add("sendState");
        excludeColumnFiledNames.add("logisticsState");
        excludeColumnFiledNames.add("cellStyleMap");
        return excludeColumnFiledNames;
    }
    
    private static OutputStream getOutputStream(String fileName, HttpServletResponse response) throws Exception {
        try {
            fileName = URLEncoder.encode(fileName, "UTF-8");
            response.setContentType("application/vnd.ms-excel;charset=utf-8");
            response.setCharacterEncoding("utf8");
            response.setHeader("Content-Disposition", "attachment; filename=" + fileName + ".xls");
            response.setHeader("Pragma", "public");
            response.setHeader("Cache-Control", "no-store");
            response.addHeader("Cache-Control", "max-age=0");
            return response.getOutputStream();
        } catch (IOException e) {
            throw new Exception("导出excel表格失败!", e);
        }
    }

}

// 直接这一行就能下载 多条件查询就自己拼接数据

window.location.href = 'http://localhost:8088/order/export';