基于java实现文件下载，文件来源于代码包中

package com.research.business.controller;

import com.research.common.annotation.Anonymous;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.core.io.Resource;
import org.springframework.core.io.support.PathMatchingResourcePatternResolver;
import org.springframework.core.io.support.ResourcePatternResolver;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import javax.servlet.http.HttpServletResponse;
import java.io.*;
import java.net.URLEncoder;
import java.nio.charset.StandardCharsets;

/**
 * @author zjl91
 * @description 模板下载
 * @param[1] null
 * @time 2024/4/12 11:09
 */

@Anonymous
@RestController
@RequestMapping("/template")
public class TemplateDownloadController {

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

    @GetMapping("/download")
    public void downloadTemplate(HttpServletResponse response) {

        try {
            ResourcePatternResolver resolver = new PathMatchingResourcePatternResolver();
            Resource[] resources = resolver.getResources("/template/template.xlsx");
            Resource resource = resources[0];
            //设置Headers
            response.setHeader("Content-Type", "application/octet-stream");
            //设置下载的文件的名称-该方式已解决中文乱码问题
            response.setHeader("Content-Disposition", "attachment;filename=" + URLEncoder.encode("评价关系导入模板.xlsx", StandardCharsets.UTF_8.toString()));
            try (InputStream inputStream = resource.getInputStream();
                 OutputStream outputStream = response.getOutputStream()) {

                // 将输入流的数据写入响应的输出流
                byte[] buffer = new byte[4096];
                int bytesRead;
                while ((bytesRead = inputStream.read(buffer)) != -1) {
                    outputStream.write(buffer, 0, bytesRead);
                }
            }
        } catch (IOException e) {
            log.error("评价关系导入模板不存在，请检查！");
            throw new RuntimeException(e);
        }
    }

}