WeChat JSSDK upload pictures_javascript skills

/** 
 * 获取access_token 
 *  
 * @param appid 
 *      凭证 
 * @param appsecret 
 *      密钥 
 * @return 
 */ 
public static WxAccessToken getAccessToken() { 
  WxAccessToken accessToken = null; 
  String requestUrl = access_token_url.replace("APPID", Setting.getSetting("WX_PL_APP_ID")).replace( 
      "APPSECRET", Setting.getSetting("APP_SECRET")); 
  JSONObject jsonObject = httpRequest(requestUrl, "GET", null); 
  // 如果请求成功 
  if (null != jsonObject) { 
    try { 
      accessToken = new WxAccessToken(); 
      accessToken.setToken(jsonObject.getString("access_token")); 
      accessToken.setExpiresIn(jsonObject.getInt("expires_in")); 
    } catch (JSONException e) { 
      accessToken = null; 
      // 获取token失败 
      log.error("获取token失败 errcode:{} errmsg:{}", 
          jsonObject.getInt("errcode"), 
          jsonObject.getString("errmsg")); 
    } 
  } 
  return accessToken; 
} 
public static String jsapiTicket = "https://api.weixin.qq.com/cgi-bin/ticket/getticket?access_token=ACCESS_TOKEN&type=jsapi"; 
/** 
 * 获取JsTicket 
 *  
 * @param accessToken 
 *      accessToken 
 * @return 
 */ 
public static WxJsTicket getJsTicket(String accessToken) { 
  WxJsTicket jsTicket = null; 
  String url = jsapiTicket.replaceAll("ACCESS_TOKEN", accessToken); 
  JSONObject jsonObject = httpRequest(url, "GET", null); 
  // 如果请求成功 
  if (null != jsonObject) { 
    try { 
      jsTicket = new WxJsTicket(); 
      jsTicket.setTicket(jsonObject.getString("ticket")); 
      jsTicket.setExpiresIn(jsonObject.getInt("expires_in")); 
    } catch (JSONException e) { 
      jsTicket = null; 
      // 获取token失败 
      log.error("获取jsapiTicket失败 errcode:{} errmsg:{}", 
          jsonObject.getInt("errcode"), 
          jsonObject.getString("errmsg")); 
    } 
  } 
  return jsTicket; 
} 

wx.config({ 
   debug: false, // 开启调试模式,调用的所有api的返回值会在客户端alert出来，若要查看传入的参数，可以在pc端打开，参数信息会通过log打出，仅在pc端时才会打印。 
   appId: "$!{wxsign.get('appId')}", // 必填，公众号的唯一标识 
   timestamp: "$!{wxsign.get('timeStamp')}", // 必填，生成签名的时间戳 
   nonceStr: "$!{wxsign.get('nonceStr')}", // 必填，生成签名的随机串 
   signature: "$!{wxsign.get('signature')}",// 必填，签名，见附录1 
   jsApiList: ['checkJsApi', 
         'chooseImage', 
         'previewImage', 
         'uploadImage'] // 必填，需要使用的JS接口列表，所有JS接口列表见附录2 
 }); 
 
 var images = { 
  localId: [], 
  serverId: [] 
 }; 

wx.chooseImage({
  count: 1, // 默认9
  sizeType: ['original', 'compressed'], // 可以指定是原图还是压缩图，默认二者都有
  sourceType: ['album', 'camera'], // 可以指定来源是相册还是相机，默认二者都有
  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
  }
});

wx.uploadImage({
  localId: '', // 需要上传的图片的本地ID，由chooseImage接口获得
  isShowProgressTips: 1, // 默认为1，显示进度提示
  success: function (res) {
    var serverId = res.serverId; // 返回图片的服务器端ID
  }
});

/** 
 * 获取媒体文件 
 *  
 * @param accessToken 
 *      接口访问凭证 
 * @param media_id 
 *      媒体文件id 
 * */ 
public static String downloadMedia(String mediaId,HttpServletRequest request) { 
  String requestUrl = "http://file.api.weixin.qq.com/cgi-bin/media/get?access_token=ACCESS_TOKEN&media_id=MEDIA_ID"; 
  requestUrl = requestUrl.replace("ACCESS_TOKEN", WxTokenThread.accessToken.getToken()).replace( 
      "MEDIA_ID", mediaId); 
  HttpURLConnection conn = null; 
  try { 
    URL url = new URL(requestUrl); 
    conn = (HttpURLConnection) url.openConnection(); 
    conn.setDoInput(true); 
    conn.setRequestMethod("GET"); 
    conn.setConnectTimeout(30000); 
    conn.setReadTimeout(30000); 
    BufferedInputStream bis = new BufferedInputStream( 
        conn.getInputStream()); 
    ByteArrayOutputStream swapStream = new ByteArrayOutputStream();  
    byte[] buff = new byte[100];  
    int rc = 0;  
    while ((rc = bis.read(buff, 0, 100)) > 0) {  
      swapStream.write(buff, 0, rc);  
    }  
    byte[] filebyte = swapStream.toByteArray();  
    return PictureStore.getInstance().getImageServerUrl() + PictureStore.getInstance().store(filebyte); 
  } catch (Exception e) { 
    e.printStackTrace(); 
  } finally { 
    if(conn != null){ 
      conn.disconnect(); 
    } 
  } 
  return ""; 
} 

$('#filePicker').on('click', function () {
 wx.chooseImage({
  success: function (res) {
   var localIds = res.localIds;
   syncUpload(localIds);
  }
 });
});
var syncUpload = function(localIds){
 var localId = localIds.pop();
 wx.uploadImage({
  localId: localId,
  isShowProgressTips: 1,
  success: function (res) {
   var serverId = res.serverId; // 返回图片的服务器端ID
   //其他对serverId做处理的代码
   if(localIds.length > 0){
    syncUpload(localIds);
   }
  }
 });
};