springBoot 文件上传与下载整合

Spring Boot 文件上传及下载方案

1.controller文件上传部分

注意：其中AjaxResult为返回封装类，这个类可有可无，开发环境下为了统一返回格式用

 	@PostMapping("/upload")
    public AjaxResult uploadFile(MultipartFile file) throws Exception {
        try {
            // 上传文件路径(这里最好配置在yml中，以方便后续修改 若为linux 可以直接写:"/home/upload/" ,具体地址，大家自己定就可以)
            String filePath = "D:/base/uploadPath"
           //获取上传的文件名称
         	String fileName = file.getOriginalFilename();
         	//构造路径，返回file对象
            File desc = new File(filePath + File.separator + fileName);
             if (!desc.getParentFile().exists()) {
            	desc.getParentFile().mkdirs();
       		 }
            //进行上传
            file.transferTo(desc);
            AjaxResult ajax = AjaxResult.success();
            //这里是将file的名称和路径返回到请求调用处
            ajax.put("fileName", fileName);
            return ajax;
        } catch (Exception e) {
            return AjaxResult.error(e.getMessage());
        }
    }

2.controller文件下载部分

    /**
     * 本地资源通用下载
     */
    @GetMapping("/download")
    public void resourceDownload(@ApiParam(name = "name", value = "文件名称", required = true, type = "String")String name, HttpServletRequest request, HttpServletResponse response) throws Exception {
        // 本地资源路径
        String localPath = "D:/base/uploadPath"
        // 数据库资源地址
        String downloadPath = localPath +"/" +name;
        // 下载名称,这里浏览器不同，需要做的处理也不同；
        String encodeName = URLEncoder.encode(name, "utf-8");
        File file = new File(downloadPath);
        if (file.exists()) {
            response.setCharacterEncoding("utf-8");
            response.setContentType("application/force-download");
            response.addHeader("Content-Disposition", "attachment;fileName=" + encodeName);
            byte[] buffer = new byte[1024];
            FileInputStream fis = null;
            BufferedInputStream bis = null;
            try {
                fis = new FileInputStream(file);
                bis = new BufferedInputStream(fis);
                OutputStream outputStream = response.getOutputStream();
                int i = bis.read(buffer);
                while (i != -1) {
                    outputStream.write(buffer, 0, i);
                    i = bis.read(buffer);
                }
            }catch (Exception e){
                e.printStackTrace();
            }
        }
    }

关于根据浏览器设置返回名称的方法

public static String setFileDownloadHeader(HttpServletRequest request, String fileName)
        throws UnsupportedEncodingException
{
    final String agent = request.getHeader("USER-AGENT");
    String filename = fileName;
    if (agent.contains("MSIE"))
    {
        // IE浏览器
        filename = URLEncoder.encode(filename, "utf-8");
        filename = filename.replace("+", " ");
    }
    else if (agent.contains("Firefox"))
    {
        filename = new String(fileName.getBytes(), "ISO8859-1");
    }
    else if (agent.contains("Chrome"))
    {
        // google浏览器
        filename = URLEncoder.encode(filename, "utf-8");
    }
    else
    {
        // 其它浏览器
        filename = URLEncoder.encode(filename, "utf-8");
    }
    return filename;
}

关于对上传文件的直接url访问，需要映射目录路径，以D:/base/uploadPath 为例,

/**
 * 资源映射路径
 */
@Configuration
public class MyWebAppConfigurer implements WebMvcConfigurer {
    @Override
    public void addResourceHandlers(ResourceHandlerRegistry registry) {
        registry.addResourceHandler("/temp-rainy/**").addResourceLocations("file:D:/base/uploadPath/");
    }
}

本文地址：https://blog.csdn.net/qq_33304139/article/details/110441887