Ruoyi若依框架下载流程详细解读（SpringBoot-Vue）

图解：

前端设计：

前端设计一个link文字连接或者按钮（ElementUI）Element - The world's most popular Vue UI framework

前端请求设计：

import request from '@/utils/request'//下载示例模型定义语言的JSONexport const publishExportTemplateFile = (res, name, type = false) => {  let url;  if (type) {    url = window.URL.createObjectURL(new Blob([res], {type: 'application/json5'}));//application后短语相应类型，// Important blob类型接收  } else {    url = window.URL.createObjectURL(new Blob([res]));  }  // const url = window.URL.createObjectURL(new Blob([res]));  const link = document.createElement('a');  link.style.display = 'none';  link.href = url;  link.setAttribute('download', name);  document.body.appendChild(link);  link.click();  document.body.removeChild(link);}export function downloadFile(filePath) {  return request({    url: '/configuration/download',    method: 'get',    params: { fileName: filePath, delete: false },    responseType: 'blob' // 设置响应类型为 blob  })}

其中 publishExportTemplateFile 函数用于处理文件下载的前端逻辑，而 downloadFile 函数用于发起后端请求获取文件。

前端Vue组件

      下载示例配置文件

import {downloadFile,publishExportTemplateFile } from "@/api/register/register";

export default {

  data() {

      return {

           filename:"template.json5"

      }

    },

methods(){

    download(filename){

      downloadFile(filename).then(response => {

        publishExportTemplateFile(response, filename);

      }).catch(error => {

        console.error('Download file failed:', error);

      });

    },

}

};

后端Controller：

@GetMapping("/download")public void fileDownload(String fileName, Boolean delete, HttpServletResponse response, HttpServletRequest request) {    try {        if (!FileUtils.checkAllowDownload(fileName)) {            throw new Exception(StringUtils.format("文件名称({})非法，不允许下载。 " , fileName));        }        String realFileName = System.currentTimeMillis() + fileName.substring(fileName.indexOf("_") + 1);        System.out.println("realFileName = " + realFileName);        String filePath = RuoYiConfig.getDownloadPath() + fileName; //注意这里的路径要和你下载的路径对应        response.setContentType(MediaType.APPLICATION_OCTET_STREAM_VALUE);        FileUtils.setAttachmentResponseHeader(response, realFileName);        FileUtils.writeBytes(filePath, response.getOutputStream());        if (delete) {            FileUtils.deleteFile(filePath);        }    } catch (Exception e) {        log.error("下载文件失败", e);    }}

后端Utils:

//从全局配置文件获取下载文件所在目录（src/main/java/com/ruoyi/common/config/RuoYiConfig.java）

@Component@ConfigurationProperties(prefix = "ruoyi")public class RuoYiConfig{        public static String getProfile()        {            return profile;        }        public void setProfile(String profile)        {            RuoYiConfig.profile = profile;        }/** * 获取下载路径 */        public static String getDownloadPath()        {            return getProfile() + "/download/";        }        /** 上传路径 */        private static String profile

//文件相关操作public class FileUtils extends FileUtil {    /**     * 下载文件名重新编码     *     * @param response     响应对象     * @param realFileName 真实文件名     */    public static void setAttachmentResponseHeader(HttpServletResponse response, String realFileName) throws UnsupportedEncodingException {        String percentEncodedFileName = percentEncode(realFileName);        StringBuilder contentDispositionValue = new StringBuilder();        contentDispositionValue.append("attachment; filename=")            .append(percentEncodedFileName)            .append(";")            .append("filename*=")            .append("utf-8''")            .append(percentEncodedFileName);        response.addHeader("Access-Control-Expose-Headers", "Content-Disposition,download-filename");        response.setHeader("Content-disposition", contentDispositionValue.toString());        response.setHeader("download-filename", percentEncodedFileName);    }

public static void writeBytes(String filePath, OutputStream os) throws IOException{    FileInputStream fis = null;    try    {        File file = new File(filePath);        if (!file.exists())        {            throw new FileNotFoundException(filePath);        }        fis = new FileInputStream(file);        byte[] b = new byte[1024];        int length;        while ((length = fis.read(b)) > 0)        {            os.write(b, 0, length);        }    }    catch (IOException e)    {        throw e;    }    finally    {        IOUtils.close(os);        IOUtils.close(fis);    }}