微信开发之调起摄像头、本地展示图片、上传下载图片方法

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 　　] });

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

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");                }              }          }      }

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