服务端与服务端之间的文件上传和下载

服务端与服务端之间的文件上传和下载

• HttpClient文件上传、下载工具类

  /**
   * Copyright (C), 2020-06-11
   * FileName: HttpClientFileUtil
   * Author:   heyanbo
   * Date:     2020/6/11 12:33
   * Description: HttpClient文件上传和下载
   */
  package com.github.code.utils;
  
  import org.apache.http.HttpEntity;
  import org.apache.http.HttpResponse;
  import org.apache.http.client.config.RequestConfig;
  import org.apache.http.client.methods.CloseableHttpResponse;
  import org.apache.http.client.methods.HttpGet;
  import org.apache.http.client.methods.HttpPost;
  import org.apache.http.entity.ContentType;
  import org.apache.http.entity.mime.HttpMultipartMode;
  import org.apache.http.entity.mime.MultipartEntityBuilder;
  import org.apache.http.impl.client.CloseableHttpClient;
  import org.apache.http.impl.client.HttpClients;
  import org.apache.http.util.EntityUtils;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  import org.springframework.web.multipart.MultipartFile;
  
  import java.io.File;
  import java.io.FileOutputStream;
  import java.io.IOException;
  import java.io.InputStream;
  import java.nio.charset.Charset;
  import java.util.Map;
  import java.util.Objects;
  
  /**
   * <功能简要> 
  
   * 
   *
   * @Author heyanbo
   * @createTime 2020/6/11 12:33
   * @since
   */
  public class HttpClientFileUtil {
  
      private static final Logger LOGGER = LoggerFactory.getLogger(HttpClientFileUtil.class);
  
      public static final int CONNECTION_TIMEOUT = 35000;
      public static final int CONNECTION_REQUEST_TIMEOUT = 35000;
      public static final int SOCKET_TIMEOUT = 60000;
      public static final String UTF_8 = "UTF-8";
  
  
      public static String upload(String token, String url, MultipartFile file, String fileParamName, Map<String, String> otherParams){
          CloseableHttpClient httpClient = HttpClients.createDefault();
          String result = "";
          String fileName = file.getOriginalFilename();
          try {
              HttpPost httpPost = new HttpPost(url);
              RequestConfig requestConfig = RequestConfig.custom().setConnectTimeout(CONNECTION_TIMEOUT).setConnectionRequestTimeout(CONNECTION_REQUEST_TIMEOUT).setSocketTimeout(SOCKET_TIMEOUT).build();
              httpPost.setConfig(requestConfig);
              httpPost.setHeader("DataEncoding", UTF_8);
              httpPost.setHeader("token", token);
              MultipartEntityBuilder builder = MultipartEntityBuilder.create();
              builder.setCharset(Charset.forName("utf-8"));
              //解决返回中文乱码问题
              builder.setMode(HttpMultipartMode.BROWSER_COMPATIBLE);
              builder.addBinaryBody("file", file.getInputStream(), ContentType.MULTIPART_FORM_DATA, fileName);
              //模拟浏览器表单提交
              for (Map.Entry<String, String> entry : otherParams.entrySet()){
                  builder.addTextBody(entry.getKey(), entry.getValue());
              }
  
              HttpEntity entity = builder.build();
              httpPost.setEntity(entity);
              HttpResponse response = httpClient.execute(httpPost);
              HttpEntity responseEntity = response.getEntity();
              if (Objects.nonNull(responseEntity)){
                  //将返回值转化为字符串
                  result = EntityUtils.toString(responseEntity, Charset.forName(UTF_8));
              }
          } catch (Exception e) {
              LOGGER.error("上传文件异常，异常信息:"+e);
          }finally {
              try {
                  httpClient.close();
              }catch (IOException e){
                  e.printStackTrace();
              }
          }
          return result;
      }
  
      public static void downLoad(String url, Map<String, String> map, String remoteFileName, String localFileName){
          CloseableHttpClient httpClient = HttpClients.createDefault();
          map.put("fileName", remoteFileName);
          String downUrl = getUrl(url, map);
          String fileUrl = downUrl.replace("downLoad=false", "downLoad=true");
          LOGGER.info("downLoad url is :"+fileUrl);
          HttpGet httpGet = new HttpGet(fileUrl);
          httpGet.setHeader("fileName", remoteFileName);
  
          RequestConfig requestConfig = RequestConfig.custom().setConnectTimeout(CONNECTION_TIMEOUT).setConnectionRequestTimeout(CONNECTION_REQUEST_TIMEOUT).setSocketTimeout(SOCKET_TIMEOUT).build();
          httpGet.setConfig(requestConfig);
          CloseableHttpResponse httpResponse = null;
          FileOutputStream outputStream = null;
          InputStream inputStream = null;
  
          try {
              httpResponse = httpClient.execute(httpGet);
              HttpEntity entity = httpResponse.getEntity();
              File storeFile = new File(localFileName);
              inputStream = httpResponse.getEntity().getContent();
  
              byte[] buff = new byte[30*1024*1024];
              int len = 0;
              while ((len = inputStream.read(buff)) > 0){
                  outputStream.write(buff, 0, len);
                  outputStream.flush();
              }
          } catch (Exception e) {
              LOGGER.error("get下载文件请求错误："+e);
          }finally {
              if (inputStream != null){
                  try {
                      inputStream.close();
                  }catch (IOException e){
                      LOGGER.error("输入流关闭失败:"+e);
                  }
              }
              if (outputStream != null){
                  try {
                      outputStream.close();
                  }catch (IOException e){
                      LOGGER.error("输出流关闭失败:"+e);
                  }
              }
  
              if (httpResponse != null){
                  try {
                      httpResponse.close();
                  } catch (IOException e) {
                      LOGGER.error("httpResponse关闭失败："+e);
                  }
              }
              if (httpClient != null){
                  try {
                      httpClient.close();
                  }catch (IOException e){
                      LOGGER.error("httpClient连接关闭失败："+e);
                  }
              }
          }
  
      }
  
      public static String getUrl(String url, Map<String, String> map){
          int i=0;
          for (Map.Entry<String, String> entry:map.entrySet()){
              if (i==0){
                  url+= "?"+entry.getKey()+"="+entry.getValue();
              }else {
                  url+= "&"+entry.getKey()+"="+entry.getValue();
              }
              i++;
          }
          return url;
      }
  }
  
  

• 文件上传服务端接口示例

  	@PostMapping("/upload")
      @ResponseBody
      public String fileUpload(@RequestParam(value = "file") MultipartFile file,
                               @RequestParam(value = "tenantName")String tenantName,
                               @RequestParam(value = "chunk")Integer chunk,
                               @RequestParam(value = "chunks")Integer chunks){
          if (Objects.isNull(file)){
              return "文件上传失败，请重新选择文件";
          }
          return fileManageService.upload(file);
      }
  

• 文件下载服务端接口示例

  • Controller接口

    	@GetMapping("/download")
        @ResponseBody
        public String fileDownload(@RequestParam(value = "fileName") String fileName, HttpServletResponse response){
            if (Objects.isNull(fileName)){
                return "文件下载失败，请选择文件要下载的文件";
            }
            return fileManageService.download(fileName, response);
        }
    

  • serviceImpl实现类

        @Override
        public void download(String fileName, HttpServletResponse response)throws CustomException{
            if (StringUtils.isBlank(fileName)){
                throw new CustomException("参数不能为空");
            }
    
            File file = new File(saveAddr + fileName);
            if (!file.exists()){
                throw new CustomException("文件不存在");
            }
    
            BufferedInputStream bufferedInputStream = null;
            OutputStream outputStream = null;
            FileInputStream fileInputStream = null;
            try {
                fileInputStream = new FileInputStream(file);
                bufferedInputStream = new BufferedInputStream(fileInputStream);
                response.setCharacterEncoding("utf-8");
                response.setContentType("application/octet-stream");
                response.setContentLength((int)file.length());
                response.setHeader("Accept-Ranges", fileName);
                response.addHeader("fileName", fileName);
                outputStream = response.getOutputStream();
                int len;
                byte[] buffer = new byte[2048];
                while ((len = bufferedInputStream.read(buffer)) != -1){
                    outputStream.write(buffer, 0, len);
                }
                outputStream.flush();
            }catch (Exception e) {
                LOGGER.error("文件下载失败", e.getMessage());
            }finally {
                try {
                    if (bufferedInputStream != null){
                        bufferedInputStream.close();
                    }
                    if (outputStream !=null){
                        outputStream.close();
                    }
                    if (fileInputStream != null){
                        fileInputStream.close();
                    }
                }catch (IOException e){
                    LOGGER.error("文件流关闭失败", e.getMessage());
                }
                file.delete();
            }
        }