easypoi-含圖片導出

准備

package com.ps.ande.util;

import org.apache.poi.ss.usermodel.Workbook;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Component;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.nio.charset.StandardCharsets;


public class ExportFacade {

    private static final Logger log = LoggerFactory.getLogger(ExportFacade.class);

    private static final String ERROR_STR = "導出文件失敗";


    public static void setProperties(HttpServletResponse response, String fileName, Workbook workbook, ServletOutputStream outputStream) throws IOException {
        fileName = new String(fileName.getBytes(StandardCharsets.UTF_8),StandardCharsets.ISO_8859_1);
        response.setHeader("Content-Disposition", "attachment;filename=" + fileName+".xls");
        response.setContentType("application/x-download");
        response.setCharacterEncoding("UTF-8");
        response.addHeader("Pargam", "no-cache");
        response.addHeader("Cache-Control", "no-cache");
        response.flushBuffer();
        workbook.write(outputStream);
        outputStream.flush();
    }

    public static void exportByExcel(HttpServletResponse response, String fileName, Workbook workbook) {
        try(ServletOutputStream outputStream = response.getOutputStream()) {
            setProperties(response, fileName, workbook, outputStream);
        } catch (IOException e) {
            log.error(ERROR_STR, e);
            new  Exception("導出文件失敗,請重試");
        }
    }
}

 

步驟1

　　參數說明

　　title: 標題　　ExcelDto: 映射實體類  row:  List 集合

　　映射實體類常用注解maven依賴查看官網 http://easypoi.mydoc.io/

　　Workbook workbook = ExcelExportUtil.exportExcel(new ExportParams(title, ""), ExcelDto.class, row);

步驟2 

　　參數說明

　　response: HttpServletResponse      fileName: 導出文件名稱     workbook: 數據導出處理

　　ExportFacade.exportByExcel(response, fileName , workbook);

步驟3

　　數據映射實體類時處理。圖片路徑字段隱藏@ExcelIgnore注解,創建byte[]  image 類型字段接收處理的圖片

 public byte[] getImage(){
        //從流中獲取數據數組。
        byte[] b = null;
        try {
            if(imageUrl!=null){
                //new一個URL對象
                URL url = new URL(getImageUrl());
                //通過輸入流獲取圖片數據
                BufferedImage image = ImageIO.read(url);
                //得到圖片的二進制數據，以二進制封裝得到數據，具有通用性
                ByteArrayOutputStream outStream = new ByteArrayOutputStream();
                ImageIO.write(image, "jpg", outStream);
                b = outStream.toByteArray();
            }
        }catch (Exception e){
            throw new YamiShopBindException("圖片處理失敗");
        }
        return b;
    }

 

Maven依賴

        <!-- Excel導出 -->
        <dependency>
            <groupId>cn.afterturn</groupId>
            <artifactId>easypoi-web</artifactId>
            <version>4.1.0</version>
            <exclusions>
                <exclusion>
                    <groupId>org.javassist</groupId>
                    <artifactId>javassist</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
        <dependency>
            <groupId>cn.afterturn</groupId>
            <artifactId>easypoi-annotation</artifactId>
            <version>4.1.0</version>
            <exclusions>
                <exclusion>
                    <groupId>org.javassist</groupId>
                    <artifactId>javassist</artifactId>
                </exclusion>
            </exclusions>
        </dependency>