微信小程序填坑：上传头像；wx.chooseImage，wx.uploadFile

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：

Page({
data: {
src: "../../image/photo.png",  //绑定image组件的src
//略...
},
onLoad: function (options) {
//略...
},
uploadPhoto() {
var that = this;
wx.chooseImage({
count: 1, // 默认9
sizeType: ['compressed'], // 可以指定是原图还是压缩图，默认二者都有
sourceType: ['album', 'camera'], // 可以指定来源是相册还是相机，默认二者都有
success: function (res) {
// 返回选定照片的本地文件路径列表，tempFilePath可以作为img标签的src属性显示图片
var tempFilePaths = res.tempFilePaths;
upload(that, tempFilePaths);
}
})
}
})

function upload(page, path) {
wx.showToast({
icon: "loading",
title: "正在上传"
}),
wx.uploadFile({
url: constant.SERVER_URL + "/FileUploadServlet",
filePath: path[0],
name: 'file',
header: { "Content-Type": "multipart/form-data" },
formData: {
//和服务器约定的token, 一般也可以放在header中
'session_token': wx.getStorageSync('session_token')
},
success: function (res) {
console.log(res);
if (res.statusCode != 200) {
wx.showModal({
title: '提示',
content: '上传失败',
showCancel: false
})
return;
}
var data = res.data
page.setData({  //上传成功修改显示头像
src: path[0]
})
},
fail: function (e) {
console.log(e);
wx.showModal({
title: '提示',
content: '上传失败',
showCancel: false
})
},
complete: function () {
wx.hideToast();  //隐藏Toast
}
})
}

 

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() {

@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);
}

}