以前那篇微信JS-SDK受權的文章實現了分享接口,那麼這裏總結一下如何在微信裏面經過js調起原生攝像頭,以及上傳下載圖片。前端
頁面引入經過jssdk受權後,傳入wx對象,首先配置須要的接口ajax
wx.config({
/* debug: true, */ appId: appid, timestamp: timestamp, nonceStr: nonceStr, signature: signature, jsApiList: [ 'chooseImage',//拍照或從手機相冊中選圖接口 'previewImage',//預覽圖片接口 'uploadImage',//上傳圖片接口 'downloadImage'//下載圖片接口 ] });
將下面的方法放在須要點擊事件的回調函數裏面 json
wx.chooseImage({
count: 1, //張數, 默認9 sizeType: ['compressed'], //建議壓縮圖 sourceType: ['album', 'camera'], // 來源是相冊、相機 success: function (res) {
//var localIds = res.localIds; // 返回選定照片的本地ID列表,localId能夠做爲img標籤的src屬性顯示圖片 $('.driver-card img').prop('src',res.localIds[0]); uploadPhoto.uploadToWeixinServer(res.localIds[0],'car') } });
這時咱們能夠看到這樣的效果,表明調起成功了!chooseImage方法的成功回調裏,我將選中的照片賦值給須要顯示的img的src(由於我這裏只有一張照片,若是有多張用循環賦值便可),這樣一來,就能夠直接顯示剛剛拍照/相冊裏選中的照片了api
在上面chooseImage的success回調裏面,能夠看到我調用了uploadToWeixinServer方法,參數爲本地照片的Id服務器
uploadToWeixinServer: function(localId,type){ wx.uploadImage({ localId: localId, isShowProgressTips: 1, // 默認爲1,顯示進度提示 success: function (res) {
//res.serverId 返回圖片的微信服務器端ID uploadPhoto.uploadToOwnerServer(res.serverId,type);//異步上傳到咱們本身的服務器 } }); },
調用uploadImage接口後,將圖片上傳到了微信服務器,返回圖片的ID,這個時候須要用ajax異步上傳到本身的服務器裏,調用微信提供的「獲取臨時素材」接口。固然也不必定是選擇完照片就當即上傳,還得根據實際業務需求出發,也有是靜默上傳(沒有進度提示),也有是在最終提交表單時一塊兒上傳微信
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 { /** 將圖片保存到本地服務器 **/ String photoName = type + new Date().getTime() + UUID.randomUUID().toString(); //文件路徑不存在則建立 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; }
這裏我使用了一個UUID生成主鍵規則,經過類型+時間戳+惟一字符串定義圖片名稱。若是上傳成功,同時又將本身服務器的圖片地址返回給前端。app
調用微信提供的獲取臨時素材接口下載還在微信服務器上的圖片,參數爲前端提交上來的媒體文件ID,最終將文件轉化爲輸入流對象dom
/** * 根據文件id下載文件 * @param accessToken * @param mediaId * @return 文件流對象 */ 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"); // 必須是get方式請求 http.setRequestProperty("Content-Type","application/x-www-form-urlencoded"); http.setDoOutput(true); http.setDoInput(true); System.setProperty("sun.net.client.defaultConnectTimeout", "30000");// 鏈接超時30秒 System.setProperty("sun.net.client.defaultReadTimeout", "30000"); // 讀取超時30秒 http.connect(); // 獲取文件轉化爲byte流 is = http.getInputStream(); } catch (Exception e) { LOGGER.error("Failed to convert inputStream from weixin server,accessToken:{},mediaId:{}",accessToken,mediaId); } return is; }
經過循環解析流對象,將文件寫入本身的服務器異步
public void saveImageToDisk(String mediaId, String picName, String picPath) throws Exception { String accessToken = getBaseAccessToken(); InputStream inputStream = getInputStream(accessToken, mediaId); // 循環取出流中的數據 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"); } } } }
那麼到這裏,簡單的拍照,展現圖片,上傳下載的功能都已經完成,其實代碼就是最好的註釋!微信開放的jssdk提供了不少友好而有趣的功能,接下來還須要繼續實踐研究....函數