Wechat applet filling pit: upload avatar; wx.chooseImage, wx.uploadFile

Because the combination of wx.chooseImage and wx.uploadFile is very common, and it is extremely easy to encounter pits; please the author to check whether there is a problem, because I see a bunch of unknown codes under the original text. . .

To upload an avatar, use wx.chooseImage({}) and then use wx.uploadFile({}) in combination.

http://www.wxapp-union.com/portal.php?mod=view&aid=907

http://www.wxapp-union.com/forum.php?mod=viewthread&tid=3454

wx.uploadFile (upload file) related issues

Sample code:

Page({
  data: {
    src: "../../image/photo.png",   // Bind the src of the image component 
     // Omitted... 
  },
  onLoad: function (options) {
      //略... 
  },
  uploadPhoto() {
    var that = this; 
    wx.chooseImage({
      count: 1, // Default 9 
      sizeType: ['compressed'], // You can specify whether it is the original image or the compressed image, both have the default 
      sourceType: ['album', 'camera'], // You can specify the source is Album or camera, both have 
      success by default: function (res) {
         // Return the list of local file paths of the selected photo, tempFilePath can be used as the src attribute of the img tag to display the picture 
        var tempFilePaths = res.tempFilePaths;
        upload(that, tempFilePaths);
      }
    })
  }
})

function upload(page, path) {
  wx.showToast({
    icon: "loading",
    title: "Uploading"
  }),
    wx.uploadFile({
      url: constant.SERVER_URL + "/FileUploadServlet",
      filePath: path[0], 
      name: 'file',
      header: { "Content-Type": "multipart/form-data" },
      formData: {
        // The token agreed with the server can generally also be placed in the header 
        'session_token': wx.getStorageSync('session_token' )
      },
      success: function (res) {
        console.log(res);
        if (res.statusCode != 200) { 
          wx.showModal({
            title: 'Tips' ,
            content: 'Upload failed' ,
            showCancel: false
          })
          return;
        }
        var data = res.data
        page.setData({   // Upload successfully modifies the display avatar 
          src: path[0 ]
        })
      },
      fail: function (e) {
        console.log(e);
        wx.showModal({
          title: 'Tips' ,
          content: 'Upload failed' ,
          showCancel: false
        })
      },
      complete: function () {
        wx.hideToast ();   //隐藏 Toast 
      }
    })
}

 

backend code

public class FileUploadServlet extends HttpServlet {

    private static final long serialVersionUID = 1L;
    private static Logger logger = LoggerFactory.getLogger(FileUploadServlet.class);

    public FileUploadServlet() {
        super();
    }

    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        JsonMessage<Object> message = new JsonMessage<Object>();
        EOSResponse eosResponse = null;
        String sessionToken = null;
        FileItem file = null;
        InputStream in = null;
        ByteArrayOutputStream swapStream1 = null;
        try {
            request.setCharacterEncoding("UTF-8"); 

            //1、创建一个DiskFileItemFactory工厂  
            DiskFileItemFactory factory = new DiskFileItemFactory();  
            //2、创建一个文件上传解析器  
            ServletFileUpload upload = new ServletFileUpload(factory);

            //解决上传文件名的中文乱码  
            upload.setHeaderEncoding("UTF-8");   
            // 1. 得到 FileItem 的集合 items  
            List<FileItem> items = upload.parseRequest(request);
            logger.info("items:{}", items.size());
            // 2. 遍历 items:  
            for (FileItem item : items) {  
                String name = item.getFieldName();  
                logger.info("fieldName:{}", name);
                // 若是一个一般的表单域, 打印信息  
                if (item.isFormField()) {  
                    String value = item.getString("utf-8");  
                    if("session_token".equals(name)){
                        sessionToken = value;
                    }
                }else {
                    if("file".equals(name)){
                        file = item;
                    }
                }  
            }
            //session校验
            if(StringUtils.isEmpty(sessionToken)){
                message.setStatus(StatusCodeConstant.SESSION_TOKEN_TIME_OUT);
                message.setErrorMsg(StatusCodeConstant.SESSION_TOKEN_TIME_OUT_MSG);
            }
            String userId = RedisUtils.hget(sessionToken,"userId");
            logger.info("userId:{}", userId);
            if(StringUtils.isEmpty(userId)){
                message.setStatus(StatusCodeConstant.SESSION_TOKEN_TIME_OUT);
                message.setErrorMsg(StatusCodeConstant.SESSION_TOKEN_TIME_OUT_MSG);
            }
            //上传文件
            if(file == null){
            }else{
                swapStream1 = new ByteArrayOutputStream();

                in = file.getInputStream();
                byte[] buff = new byte[1024];
                int rc = 0;
                while ((rc = in.read(buff)) > 0) {
                    swapStream1.write(buff, 0, rc);
                }

                Usr usr = new Usr();
                usr.setObjectId(Integer.parseInt(userId));

                final byte[] bytes = swapStream1.toByteArray();

                eosResponse= ServerProxy.getSharedInstance().saveHeadPortrait(usr, new RequestOperation() {

                    @Override
                    public void addValueToRequest(EOSRequest request) {
                        request.addMedia("head_icon_media", new EOSMediaData(EOSMediaData.MEDIA_TYPE_IMAGE_JPEG, bytes));
                    }
                });

                // 请求成功的场合
                if (eosResponse.getCode() == 0) {
                    message.setStatus(ConstantUnit.SUCCESS);
                } else {
                    message.setStatus(String.valueOf(eosResponse.getCode()));
                }
            }
        } catch (Exception e) {
            e.printStackTrace();
        } finally{
            try {
                if(swapStream1 != null){
                    swapStream1.close();
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
            try {
                if(in != null){
                    in.close();
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        PrintWriter out = response.getWriter();  
        out.write(JSONObject.toJSONString(message));  
    }

    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        doGet(request, response);
    }

}