Excel檔案位置：

後臺Controller程式碼如下：

import org.apache.commons.io.IOUtils;
import org.jeecg.common.aspect.annotation.AutoLog;
import org.springframework.core.io.ResourceLoader;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

 
import javax.annotation.Resource;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.InputStream;
import java.net.URLEncoder;
import java.nio.charset.StandardCharsets;

@RestController
@RequestMapping("")
public class DownloadExcelTemplateController {

    @Resource
    
 
private ResourceLoader resourceLoader;
    
    /**
     * 下載模板
     *
     * @param response
     */
    @AutoLog(value = "下載匯入模板")
    @RequestMapping(value = "/downloadTemp")
    public void downloadExcel(HttpServletResponse response) {
        InputStream inputStream = null;
        ServletOutputStream servletOutputStream 
 
= null;
        try {
            String filename = "匯入模板.xls";
            String path = "excel/bbb.xls";
            org.springframework.core.io.Resource resource = resourceLoader.getResource("classpath:" + path);

            response.setContentType("application/vnd.ms-excel");
            response.addHeader("Cache-Control", "no-cache, no-store, must-revalidate");
            response.addHeader("charset", "utf-8");
            response.addHeader("Pragma", "no-cache");
            String encodeName = URLEncoder.encode(filename, StandardCharsets.UTF_8.toString());
            response.setHeader("Content-Disposition", "attachment; filename=\"" + encodeName + "\"; filename*=utf-8''" + encodeName);

            inputStream = resource.getInputStream();
            servletOutputStream = response.getOutputStream();
            IOUtils.copy(inputStream, servletOutputStream);
            response.flushBuffer();
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            try {
                if (servletOutputStream != null) {
                    servletOutputStream.close();
                }
                if (inputStream != null) {
                    inputStream.close();
                }
                // jvm的垃圾回收
                System.gc();
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    }
}

如果下載的excel檔案提示損壞無法開啟，在pom.xml檔案中新增避免壓縮的外掛

<build>
        <plugins>
            <!-- 避免excel檔案壓縮破壞 -->
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-resources-plugin</artifactId>
                <version>3.2.0</version>
                <configuration>
                    <encoding>UTF-8</encoding>
                    <nonFilteredFileExtensions>
                        <nonFilteredFileExtension>xls</nonFilteredFileExtension>
                    </nonFilteredFileExtensions>
                </configuration>
            </plugin>
        </plugins>
    </build>