微信开发之调起摄像头、本地展示图片、上传下载图片实例

wx.config({
  /* debug: true, */
  appId: appid, 
  timestamp: timestamp, 
  nonceStr: nonceStr, 
  signature: signature,
  jsApiList: [
     'chooseImage',//拍照或从手机相册中选图接口
     'previewImage',//预览图片接口
     'uploadImage',//上传图片接口
     'downloadImage'//下载图片接口
 　　]
 });

wx.chooseImage({
  count: 1, //张数， 默认9
  sizeType: ['compressed'], //建议压缩图
  sourceType: ['album', 'camera'], // 来源是相册、相机
  success: function (res) {
　　　　//var localIds = res.localIds; // 返回选定照片的本地ID列表，localId可以作为img标签的src属性显示图片
  　 $('.driver-card img').prop('src',res.localIds[0]);
  　 uploadPhoto.uploadToWeixinServer(res.localIds[0],'car')
  }
});

uploadToWeixinServer: function(localId,type){
      wx.uploadImage({
        localId: localId,
        isShowProgressTips: 1, // 默认为1，显示进度提示
        success: function (res) {
　　　　　　　　　　　 //res.serverId 返回图片的微信服务器端ID
          uploadPhoto.uploadToOwnerServer(res.serverId,type);//异步上传到我们自己的服务器
        }
      });
    },

uploadToOwnerServer: function(serverId,type){
      $.ajax({
        data: {serverId:serverId,type:type},
        type : "POST",
        url : WX_ROOT + "wechat/uploadPhoto",
        success : function(json) {
          if (json) {
            var data = JSON.parse(json.data);
            if ('car' == type) 
              uploadPhoto.options.carImage = data.path + data.name
            else
              uploadPhoto.options.idCardImage = data.path + data.name
            
          }
        }
      });
    },

@RequestMapping(value = "/uploadPhoto", method = RequestMethod.POST)
  public @ResponseBody HttpResult uploadPhoto(@RequestParam String serverId,@RequestParam String type) throws Exception{
    LOGGER.info("RestFul of uploadPhoto parameters serverId:{},type:{}",serverId,type);
    
    try {
      /** 将图片保存到本地服务器 **/
      String photoName = type + new Date().getTime() + UUID.randomUUID().toString();
      
      //文件路径不存在则创建
      File saveFile = new File(PIC_PATH + type);
      if (!saveFile.mkdir()) saveFile.mkdir();
      
      wechatService.saveImageToDisk(serverId, photoName, PIC_PATH + type + "/");
      LOGGER.info("Download the picture from weixin server pathL:{}",PIC_PATH + type + "/");
      JSONObject data = new JSONObject();
      data.put("name", type + "/" + photoName+".jpg");
      data.put("path", PIC_SERVER + "/");
      
      HttpResult rs = new HttpResult();
      rs.setCode(200);
      rs.setData(data.toJSONString());
      LOGGER.info("Download the picture from weixin server is successful!serverId:{},photoName:{}",serverId,photoName);
      LOGGER.info("HttpResult data:{}",rs.getData());
      return rs;
    } catch (Exception e) {
      LOGGER.error("Download the picture from weixin server is error",serverId);
      return null;
    }

/**
   * 根据文件id下载文件 
   * @param accessToken
   * @param mediaId 
   * @return 文件流对象
   */
  public 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) { 
      LOGGER.error("Failed to convert inputStream from weixin server,accessToken:{},mediaId:{}",accessToken,mediaId);
    } 
    return is; 
 
  }

public void saveImageToDisk(String mediaId, String picName, String picPath) throws Exception { 
    String accessToken = getBaseAccessToken();
    InputStream inputStream = getInputStream(accessToken, mediaId); 
    
    // 循环取出流中的数据
    byte[] data = new byte[1024]; 
    int len = 0; 
    FileOutputStream fileOutputStream = null; 
    try { 
      fileOutputStream = new FileOutputStream(picPath+picName+".jpg"); 
      while ((len = inputStream.read(data)) != -1) { 
        fileOutputStream.write(data, 0, len); 
      } 
      LOGGER.info("Write the fileInputStream is successful");
    } catch (IOException e) { 
      LOGGER.error("Write the fileInputStream is error");
    } finally { 
      if (inputStream != null) { 
        try { 
          inputStream.close(); 
        } catch (IOException e) { 
          LOGGER.error("Close the fileInputStream is error");
        } 
      } 
      if (fileOutputStream != null) { 
        try { 
          fileOutputStream.close(); 
        } catch (IOException e) { 
          LOGGER.error("Close the fileOutputStream is error");
        } 
      } 
    } 
  }