java 上传文件 多个文件 单个文件 上传图片，上传PDF，上传doc文档等各种文件方式，附上代码

不啰嗦，直接上代码

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import .slf4j.Slf4j;
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/**
 * @NAME: hzan
 * @DATE: 2022/11/17
 *  文件上传
 **/
@Slf4j
public class import {

    /**
     * 文件上传
     * ModelAndView 响应 可以自己定义响应类型
     * @param req
     * @param res
     * @return
     * @throws Exception
     */
    public ModelAndView importFile(HttpServletRequest req, HttpServletResponse res) throws Exception {
        try {
            ("图片上传开始");
            //上传存放文件的路径
            String imageUploadPath="url";
            ("图片上传地址："+imageUploadPath);

            JSONObject jj = new JSONObject();
            MultipartHttpServletRequest multiPartReq = (MultipartHttpServletRequest) req;
            MultipartFile tfile = null;
            //前段传的特殊标识自行判断
            String type = ("type");
            if((type)) {
                tfile = (("type"));
            }else {
                tfile = ("file");
            }
            //获取文件名
            String filename = ();
            String reg = ".+(docx|DOCX|DOC|doc|PDF|pdf|JPEG|jpeg|JPG|jpg|GIF|gif|BMP|bmp|PNG|png)$";
            Pattern pattern = (reg);
            Matcher matcher = (filename);
            //设置响应状态
            rendText(res);
            //1024*1024=1MB 比较文件大小，和文件格式
            if(() > 1024*1024 && ()) {
                ("result", "err");
                ("message", "文件过大");
            }else {
                FilePathVO file = uploadFile(tfile, imageUploadPath);
                if(file != null && (()) ) {
                    ("data", file);
                    ("result", "success");
                    ("message", "上传成功");
                }else {
                    ("result", "error");
                    ("message", "上传失败");
                }
            }

            ().print(());
            ().close();

            ("文件上传结束");
            return null;
        }catch (Exception e) {
            ("图片上传异常："+());
            ();
        }
        return null;

    }

    private void rendText(HttpServletResponse res) {
        ("text/plain");
        ("UTF-8");
        ("Pragma", "no-cache");
        ("Cache-Control", "no-cache, must-revalidate");
        ("Pragma", "no-cache");
    }

    /**
     * 上传单个图片/文件
     *
     * @param upload
     * @param path   服务地址
     * @return
     * @throws IOException
     */
    public static FilePathVO uploadFile(MultipartFile upload, String path) throws IOException {
        FilePathVO filePathDTO = null;

        String content = null;
        CloseableHttpClient httpClient = ();
        HttpPost httpPost = new HttpPost(path);
        MultipartEntityBuilder builder = ();



        RequestConfig requestConfig = ()
                .setConnectTimeout(15000).setConnectionRequestTimeout(11000)
                .setSocketTimeout(15000).build();
        (requestConfig);

        if (upload != null && () != null && .(())) {

            String filename = ();
            ("file", (), ContentType.MULTIPART_FORM_DATA, filename);

            try {
                HttpEntity entity = ();
                (entity);
                CloseableHttpResponse response = (httpPost);

                InputStream in = ().getContent();

                content = (in, "utf-8");
//                (content);
//                (().getStatusCode());

                if (200==().getStatusCode()) {
                    filePathDTO = (content, );
                } else {
                    return null;
                }
            } catch (Exception e) {
                ();
            } finally {
                ();
            }
        }
        return filePathDTO;
    }

    /**
     * 上传多个文件
     *
     * @param uploads
     * @param path    服务地址
     * @return
     * @throws IOException
     */
    public static FileListVO uploadFiles(MultipartFile uploads[], String path) throws IOException {
        FileListVO fileListVO = new FileListVO();
        String content = null;
        CloseableHttpClient httpClient = ();
        HttpPost httpPost = new HttpPost(path);
        MultipartEntityBuilder builder = ();
        if (uploads != null &&  > 0) {
            for (int i = 0; i < ; i++) {
                if (uploads[i] != null && uploads[i].getInputStream() != null && .(uploads[i].getOriginalFilename())) {
                    String filename = uploads[i].getOriginalFilename();
                    ("files", uploads[i].getBytes(), ContentType.MULTIPART_FORM_DATA, filename);
                }
            }
        }

        try {
            HttpEntity entity = ();
            (entity);
            CloseableHttpResponse response = (httpPost);
            InputStream in = ().getContent();

            content = (in, "utf-8");

            if ("200".equals(())) {
                fileListVO = (FileListVO) (content, );
            } else {
                return null;
            }
        } catch (Exception e) {
            ();
        } finally {
            ();
        }
        return fileListVO;
    }
}