Android4.4 WebAPI实现拍照上传功能
网上有很多关于拍照上传的实现方法，如果用新版本android去运行有可能会发现根本实现不了。主要原因是android从4.4版本开始通过intent.ACTION_GET_CONTENT打开选择器后，getData()返回的URI没有包含真实的文件路径，而是像这样“content://com.android.providers.media.documents/document/image:1234”，以至于用传统的方式找不到图片的路径。最简单的解决办法是用intent.ACTION_PICK代替intent.ACTION_GET_CONTENT。
下面给出4.4版本后拍照上传的具体实现方法：
第一步：点击拍照按钮代码
//点击拍照
btnHeadCamera.setOnClickListener(newView.OnClickListener(){
@Override
publicvoidonClick(Viewview){
IntentitCamera=newIntent(MediaStore.ACTION_IMAGE_CAPTURE);
startActivityForResult(itCamera,0);
}
});
第二步：保存拍照图片代码
@Override
protectedvoidonActivityResult(intrequestCode,intresultCode,Intentdata){
switch(requestCode){
case0://拍照
savePhoto(data);
break;
}
super.onActivityResult(requestCode,resultCode,data);
}
finalStringSAVE_PATH=Environment.getExternalStorageDirectory()+"/my_head.jpg";//拍照后保存路径//保存图片publicvoidsavePhoto(Intentit){
Bundlebundle=it.getExtras();
if(bundle!=null){
Bitmapphoto=bundle.getParcelable("data");
imgHead.setImageBitmap(photo);
FilefileHead=newFile(SAVE_PATH);
try{
if(Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)){
if(!fileHead.getParentFile().exists()){
fileHead.getParentFile().mkdir();
}
BufferedOutputStreambos=newBufferedOutputStream(newFileOutputStream(fileHead));
photo.compress(Bitmap.CompressFormat.JPEG,80,bos);
bos.flush();
bos.close();
}else{
Toasttoast=Toast.makeText(HeadPhotoActivity.this,"保存失败！",Toast.LENGTH_SHORT);
toast.setGravity(Gravity.CENTER,0,0);
toast.show();
}
}catch(FileNotFoundExceptione){
e.printStackTrace();
}catch(IOExceptione){
e.printStackTrace();
}
}
}
第三步：上传图片代码
StringSERVER_URL=Config.PhotoAPI+"/UploadImage";//上传的服务端API地址btnHeadCancel.setOnClickListener(newView.OnClickListener(){
@Override
publicvoidonClick(Viewview){
newThread(newRunnable(){
@Override
publicvoidrun(){
Filefile=newFile(SAVE_PATH);
Messagemsg=newMessage();
msg.what=0;
if(file!=null){
try{
intre=ImageUtils.uploadForm(file,SERVER_URL);
msg.obj=re;
}catch(IOExceptionex){
msg.obj=0;
Toast.makeText(HeadPhotoActivity.this,"上传失败",Toast.LENGTH_SHORT).show();
}
handler.sendMessage(msg);
}else{
Toast.makeText(HeadPhotoActivity.this,"找不到上传图片",Toast.LENGTH_SHORT).show();
}
}
}).start();
}
});
finalHandlerhandler=newHandler(){
@Override
publicvoidhandleMessage(Messagemsg){
switch(msg.what){
case0:
if((int)msg.obj==1){
Toast.makeText(HeadPhotoActivity.this,"上传成功",Toast.LENGTH_SHORT).show();
}else{
Toast.makeText(HeadPhotoActivity.this,"上传失败",Toast.LENGTH_SHORT).show();
}
break;
}
}
};
/**
*
*@paramuploadFile
*需要上传的文件
*@paramserverUrl
*上传的服务器的路径
*@throwsIOException
*/
publicstaticintuploadForm(FileuploadFile,StringserverUrl)
throwsIOException{
intre=0;
StringfileName=uploadFile.getName();
StringBuildersb=newStringBuilder();
sb.append("--"+BOUNDARY+"\r\n");
sb.append("Content-Disposition:form-data;name=\""+fileName
+"\";filename=\""+fileName+"\""+"\r\n");
sb.append("Content-Type:image/jpeg"+"\r\n");
sb.append("\r\n");
byte[]headerInfo=sb.toString().getBytes("UTF-8");
byte[]endInfo=("\r\n--"+BOUNDARY+"--\r\n").getBytes("UTF-8");
System.out.println(sb.toString());
URLurl=newURL(serverUrl);
HttpURLConnectionconn=(HttpURLConnection)url.openConnection();
conn.setRequestMethod("POST");
conn.setRequestProperty("Content-Type",
"multipart/form-data;boundary="+BOUNDARY);
conn.setRequestProperty("Content-Length",String
.valueOf(headerInfo.length+uploadFile.length()
+endInfo.length));
conn.setDoOutput(true);
OutputStreamout=conn.getOutputStream();
InputStreamin=newFileInputStream(uploadFile);
out.write(headerInfo);
byte[]buf=newbyte[1024];
intlen;
while((len=in.read(buf))!=-1)
out.write(buf,0,len);
out.write(endInfo);
in.close();
out.close();
if(conn.getResponseCode()==200){
re=1;
}
returnre;
}
最后给出服务端WebAPI代码：
[HttpPost]
publicasyncTask<HttpResponseMessage>UploadImage()
{stringfilePath="~\\UploadFiles\\Photo";
//取得文件夹
stringdir=HttpContext.Current.Server.MapPath(filePath);
//如果不存在文件夹，就创建文件夹
if(!Directory.Exists(dir))
Directory.CreateDirectory(dir);
if(!Request.Content.IsMimeMultipartContent("form-data"))
{
thrownewHttpResponseException(HttpStatusCode.UnsupportedMediaType);
}
varprovider=newCustomMultipartFormDataStreamProvider(dir);
try
{
//Readtheformdata.
awaitRequest.Content.ReadAsMultipartAsync(provider);
foreach(MultipartFileDatafileinprovider.FileData)
{
//file.Headers.ContentDisposition.FileName;//上传文件前的文件名
//file.LocalFileName;//上传后的文件名
Photop=newPhoto();
p.ImgInfo=file.LocalFileName.Substring(file.LocalFileName.LastIndexOf("\\"));
p.Sort="员工相册";
p.AddUser="admin";
p.AddTime=DateTime.Now;
p.Url=filePath+p.ImgInfo;
db.Photo.Add(p);
db.SaveChanges();
}
returnRequest.CreateResponse(HttpStatusCode.OK);}
catch
{
returnRequest.CreateResponse(HttpStatusCode.BadRequest);}
}
//重写上传文件名
publicclassCustomMultipartFormDataStreamProvider:MultipartFormDataStreamProvider
{
publicCustomMultipartFormDataStreamProvider(stringpath)
:base(path)
{}
publicoverridestringGetLocalFileName(System.Net.Http.Headers.HttpContentHeadersheaders)
{
stringfileName=DateTime.Now.ToString("yyyyMMddHHmmssfff");
returnfileName+"_"+headers.ContentDisposition.FileName.Replace("\"",string.Empty);//base.GetLocalFileName(headers);
}
}
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持毛票票。