微信开发之调起摄像头、本地展示图片、上传下载图片方法
本文介绍微信开发之调起摄像头、本地展示图片、上传下载图片方法1.配置页面引入通过jssdk授权后,传入wx对象,首先配置需要的接口 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 ] });
2.调起拍照/相册将下面的方法放在需要点击事件的回调函数里面 wx.chooseImage({ count: 1, sizeType: ['compressed'], sourceType: ['album', 'camera'], success: function (res) { //var localIds = res.localIds; $('.driver-card img').prop('src',res.localIds[0]); uploadPhoto.uploadToWeixinServer(res.localIds[0],'car') }});
这时我们可以看到这样的效果,代表调起成功了!chooseImage方法的成功回调里,我将选中的照片赋值给需要显示的img的src(因为我这里只有一张照片,如果有多张用循环赋值即可),这样一来,就可以直接显示刚刚拍照/相册里选中的照片了
3.上传照片在上面chooseImage的success回调里面,可以看到我调用了uploadToWeixinServer方法,参数为本地照片的Id uploadToWeixinServer: 1 调用uploadImage接口后,将图片上传到了微信服务器,返回图片的ID,这个时候需要用ajax异步上传到自己的服务器里,调用微信提供的“获取临时素材”接口。当然也不一定是选择完照片就立即上传,还得根据实际业务需求出发,也有是静默上传(没有进度提示),也有是在最终提交表单时一起上传 js: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 } } }); },
Controller@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; } 这里我使用了一个UUID生成主键规则,通过类型+时间戳+唯一字符串定义图片名称。如果上传成功,同时又将自己服务器的图片地址返回给前端。
getInputStream调用微信提供的获取临时素材接口下载还在微信服务器上的图片,参数为前端提交上来的媒体文件ID,最终将文件转化为输入流对象 /** * 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://www.php.cn/"+ 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; }
service通过循环解析流对象,将文件写入自己的服务器 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"); } } } } 以上就是微信开发之调起摄像头、本地展示图片、上传下载图片方法的详细内容,更多请关注php中文网其它相关文章! |
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