本文主要是介绍微信小程序填坑：上传头像；wx.chooseImage，wx.uploadFile，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！
因为wx.chooseImage，wx.uploadFile的组合十分常见，并且极其容易遇到坑；请作者来检查一下是否有问题，因为我看到原文底下有一堆不明代码。。。上传头像, 使用wx.chooseImage({})后 在使用wx.uploadFile({})结合起来使用.
http://www.wxapp-union.com/portal.php?mod=view&aid=907
http://www.wxapp-union.com/forum.php?mod=viewthread&tid=3454
wx.uploadFile（上传文件）相关问题
示例代码：
后端代码
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() {@Overridepublic 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);}}
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