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(new view.onclicklistener() {
      @override
      public void onclick(view view) {
        intent itcamera=new intent(mediastore.action_image_capture);
        startactivityforresult(itcamera,0);
      }
    });

第二步：保存拍照图片代码 

@override
  protected void onactivityresult(int requestcode, int resultcode, intent data) {
    switch (requestcode){
      case 0://拍照
        savephoto(data);
        break;
    }
    super.onactivityresult(requestcode, resultcode, data);
  }

  final string save_path=environment.getexternalstoragedirectory()+"/my_head.jpg"; //拍照后保存路径   //保存图片  public void savephoto(intent it){
    bundle bundle=it.getextras();
    if(bundle!=null){
      bitmap photo = bundle.getparcelable("data");
      imghead.setimagebitmap(photo);
      file filehead=new file(save_path);
      try {
        if(environment.getexternalstoragestate().equals(environment.media_mounted)){
          if(!filehead.getparentfile().exists()){
            filehead.getparentfile().mkdir();
          }
          bufferedoutputstream bos=new bufferedoutputstream(new fileoutputstream(filehead));
          photo.compress(bitmap.compressformat.jpeg,80,bos);
          bos.flush();
          bos.close();
        }else {
          toast toast = toast.maketext(headphotoactivity.this, "保存失败！", toast.length_short);
          toast.setgravity(gravity.center, 0, 0);
          toast.show();
        }
      }catch (filenotfoundexception e){
        e.printstacktrace();
      }catch (ioexception e){
        e.printstacktrace();
      }
    }
  }

第三步：上传图片代码 

string server_url = config.photoapi+"/uploadimage";//上传的服务端api地址btnheadcancel.setonclicklistener(new view.onclicklistener() {
      @override
      public void onclick(view view) {
        new thread(new runnable() {
          @override
          public void run() {
            file file = new file(save_path);
            message msg = new message();
            msg.what = 0;
            if(file!=null) {
              try {
               int re = imageutils.uploadform(file, server_url);
                msg.obj = re;
              } catch (ioexception ex) {
                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();
      }
    });

final handler handler=new handler(){
      @override
      public void handlemessage(message msg) {
        switch (msg.what) {
          case 0:
            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;
        }

      }
    };

/**
   *
   * @param uploadfile
   *      需要上传的文件
   * @param serverurl
   *      上传的服务器的路径
   * @throws ioexception
   */
  public static int uploadform(file uploadfile, string serverurl)
      throws ioexception {
    int re=0;

    string filename = uploadfile.getname();
    stringbuilder sb = new stringbuilder();
    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());
    url url = new url(serverurl);
    httpurlconnection conn = (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);

    outputstream out = conn.getoutputstream();
    inputstream in = new fileinputstream(uploadfile);
    out.write(headerinfo);

    byte[] buf = new byte[1024];
    int len;
    while ((len = in.read(buf)) != -1)
      out.write(buf, 0, len);

    out.write(endinfo);
    in.close();
    out.close();
    if (conn.getresponsecode() == 200) {
      re=1;
    }
    return re;
  }

最后给出服务端webapi代码： 

    [httppost]
    public async task<httpresponsemessage> uploadimage()
    {string filepath = "~\\uploadfiles\\photo";
      // 取得文件夹
      string dir = 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"))
      {
        throw new httpresponseexception(httpstatuscode.unsupportedmediatype);
      }
      var provider = new custommultipartformdatastreamprovider(dir);
      try
      {
        // read the form data. 
        await request.content.readasmultipartasync(provider);
        foreach (multipartfiledata file in provider.filedata)
        {
          //file.headers.contentdisposition.filename;//上传文件前的文件名
          //file.localfilename;//上传后的文件名
          photo p = new photo();
          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();
        }
        return request.createresponse(httpstatuscode.ok);      }
      catch
      {
        return request.createresponse(httpstatuscode.badrequest);      }
    }

  //重写上传文件名
  public class custommultipartformdatastreamprovider : multipartformdatastreamprovider 
  {
    public custommultipartformdatastreamprovider(string path)
      : base(path)
    { }

    public override string getlocalfilename(system.net.http.headers.httpcontentheaders headers)
    {
      string filename = datetime.now.tostring("yyyymmddhhmmssfff");
      return filename + "_" + headers.contentdisposition.filename.replace("\"", string.empty);//base.getlocalfilename(headers);
    }
  }

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