下载微信服务器上的图片到自己的服务器

下载微信服务器上的图片到自己的服务器

微信上传图片后

• 单张图片将返回serverId
• 多张图片将返回serverId数组，后续只需遍历下载即可

下载微信服务器上的图片

• 工具类

   

  。。。
  import java.io.File;
  import java.io.FileOutputStream;
  import java.io.IOException;
  import java.io.InputStream;
  import java.net.HttpURLConnection;
  import java.net.URL;
  
  public class ImageUtils {
      /**
       * @param temp_path(注：临时文件存储目录)
       * @param serverId(注：图片上传完微信服务器后返回的serverId)
       * @param image_number(注：图片的编号)
       * @return
       */
      public static boolean saveImage(String temp_path, String serverId, String image_number) {
          boolean isSave = true;
  
          File saveFile = new File(temp_path);
          if (!saveFile.exists()) {
              saveFile.mkdirs();
          }
  
          try {
              String s = saveImageToDisk(serverId, image_number, temp_path + "/");
              if (s != null || !"".equals(s.trim())) {
                  isSave = true;
              }
          } catch (Exception e) {
              e.printStackTrace();
          }
          return isSave;
      }
  
      //获取
      private static InputStream getInputStream(String accessToken, String mediaId) {
          InputStream is = null;
          String url = "http://file.api.weixin.qq.com/cgi-bin/media/get?access_token=" + accessToken + "&media_id=" + mediaId;
          try {
              URL urlGet = new URL(url);
              HttpURLConnection http = (HttpURLConnection) urlGet.openConnection();
              http.setRequestMethod("GET"); // 必须是get方式请求
              http.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
              http.setDoOutput(true);
              http.setDoInput(true);
              System.setProperty("sun.net.client.defaultConnectTimeout", "30000");// 连接超时30秒
              System.setProperty("sun.net.client.defaultReadTimeout", "30000"); // 读取超时30秒
              http.connect();
              // 获取文件转化为byte流
              is = http.getInputStream();
          } catch (Exception e) {
          }
          return is;
  
      }
  
      private static String saveImageToDisk(String serverId, String picName, String picPath) throws Exception {
  
          Weixin weixin = new Weixin(ConfigData.weixin_app_id, ConfigData.weixin_secret, ConfigData.weixin_cache_dir);//此步骤你自己创建自己的weixin对象
          String accessToken = weixin.getGlobalAccessToken();
          InputStream inputStream = getInputStream(accessToken, serverId);
  
          // 循环取出流中的数据
          byte[] data = new byte[1024];
          int len = 0;
          FileOutputStream fileOutputStream = null;
  
          String filePath = picPath + picName;
  
          try {
              fileOutputStream = new FileOutputStream(filePath);
              while ((len = inputStream.read(data)) != -1) {
                  fileOutputStream.write(data, 0, len);
              }
          } catch (IOException e) {
          } finally {
              if (inputStream != null) {
                  try {
                      inputStream.close();
                  } catch (IOException e) {
                  }
              }
              if (fileOutputStream != null) {
                  try {
                      fileOutputStream.close();
                  } catch (IOException e) {
                  }
              }
          }
  
  
          return filePath;
      }
  }
  

微信weixin对象根据你的实际情况来创建