利用WCF与Android实现图片上传并传参

最近做一个项目后端使用WCF接收Android手机拍照并带其它参数保存到服务器里;刚好把最近学习的WCF利用上,本以为是个比较简单的功能应该很好实现,没想到其中碰到不少问题,在网上搜索很久一直没有想到的解决方案,最后实现对数据流的分段写入然后后端再来解析流实现的此功能;后端运用WCF中的REST来接收数据;REST还是比较简单的知识,若是不懂可以简单网上了解一下;下面我们先了解一些本次运用到的理论知识:

一:理论知识

由于低层协议特性限制,WCF的流模式只支持如下四种:1:BasicHttpBinding 2:NetTcpBinding 3:NetNamedPipeBinding 4:WebHttpBinding

1.设置TransferMode。它支持四种模式(Buffered、Streamed、StreamedRequest、StreamedResponse),请根据具体情况设置成三种Stream模式之一。

2.修改MaxReceivedMessageSize。该值默认大小为64k,因此,当传输数据大于64k时,则抛出CommunicationException异常。

3.修改receiveTimeout 和sendTimeout。大数据传送时间较长,需要修改这两个值,以免传输超时。

二:解决问题

WCF如果使用Stream做为参数时只能唯一一个,不能有其它另外的参数,这个也是本次碰到要重点解决的一个问题;可是我们Android手机除的图片还要有其它的参数,最后决定采用手机端把参数跟图片都一起写入Stream里面,后端WCF再来解析这个参数的流;

下面就是定义好Stream的格式,传过来的Stream分成三部分: 参数信息长度参数信息 图片

1 参数信息长度(1字节):用于存放参数信息的长度(以字节为单位);

2 参数信息: 除图片以外的参数,以JSON的形式存放如{"type":"jpg","EmployeeID":"12","TaskID":"13"}

3 图片:图片的字节

三:WCF编码内容

1:我们首先定义一个WCF契约,由于我们运用REST(在命名空间ServiceModel.Web下面)契约IAndroidInfo内容如下,采用POST方式进行接收:

using System.ServiceModel;using System.Runtime.Serialization;using System.ServiceModel.Web;using System.IO;namespace Coreius.CEIMS.AndroidInterface{    [ServiceContract]    public interface IAndroidInfo    {         [WebInvoke(UriTemplate = "GpsUpFile", Method = "POST", BodyStyle = WebMessageBodyStyle.Wrapped, RequestFormat = WebMessageFormat.Json, ResponseFormat = WebMessageFormat.Json)]        bool GpsUpFile(Stream ImageContext);    }}

2:根据契约我们定义服务的内容,接收一个流的参数内容,首先把这个Stream转化成字节,然后根据我们先前约定好的内容获得第一个字节的值,再根据此值定义我们另外三个参数的字节长度,再通过JSON转换格式把它里面的三个参数值取出来,最后其它字节是存放一张手机拍的照片,把它存放在于们服务器D盘文件夹下

using System.Linq;using System.Text;using System.ServiceModel;using System.ServiceModel.Web;using System.IO;using Newtonsoft.Json;namespace Coreius.CEIMS.AndroidService{    public class AndroidInfoService:IAndroidInfo    {      public bool GpsUpFile(Stream ImageContext)        {            byte[] m_Bytes = ReadToEnd(ImageContext);            int len = (int)m_Bytes[0];            byte[] data = m_Bytes.Skip(1).Take(len).ToArray();            string Jsonstr = System.Text.Encoding.Default.GetString(data);            JsonModel item = JsonConvert.DeserializeObject<JsonModel>(Jsonstr);            string ImageType=item.type;            string EmployeeID=item.EmployeeID;            string TaskID=item.TaskID;            byte[] Imagedata = m_Bytes.Skip(1 + len).ToArray();            string DiskName = "d:";            string FileAddress = "\\UpLoad\\";            string LocationAddress = DiskName + FileAddress;            if (!DirFileHelper.IsExistDirectory(LocationAddress))            {                DirFileHelper.CreateDirectory(LocationAddress);            }            string ImageName = DateTime.Now.ToString("yyyyMMddhhmmss.") + ImageType;            string ImagePath = LocationAddress + ImageName;            if (!File.Exists(ImagePath))            {                try                {                    System.IO.File.WriteAllBytes(ImagePath, Imagedata);                    ImageContext.Close();                    return true;                }                catch                {                    return false;                }            }            else            {                return false;            }        }    }}

上面的代码用到几个方法,比如把流转化成字节、把JSON转化成实现等,代码如下:

public byte[] ReadToEnd(System.IO.Stream stream)        {            long originalPosition = 0;            if (stream.CanSeek)            {                originalPosition = stream.Position;                stream.Position = 0;            }            try            {                byte[] readBuffer = new byte[4096];                int totalBytesRead = 0;                int bytesRead;                while ((bytesRead = stream.Read(readBuffer, totalBytesRead, readBuffer.Length - totalBytesRead)) > 0)                {                    totalBytesRead += bytesRead;                    if (totalBytesRead == readBuffer.Length)                    {                        int nextByte = stream.ReadByte();                        if (nextByte != -1)                        {                            byte[] temp = new byte[readBuffer.Length * 2];                            Buffer.BlockCopy(readBuffer, 0, temp, 0, readBuffer.Length);                            Buffer.SetByte(temp, totalBytesRead, (byte)nextByte);                            readBuffer = temp;                            totalBytesRead++;                        }                    }                }                byte[] buffer = readBuffer;                if (readBuffer.Length != totalBytesRead)                {                    buffer = new byte[totalBytesRead];                    Buffer.BlockCopy(readBuffer, 0, buffer, 0, totalBytesRead);                }                return buffer;            }            finally            {                if (stream.CanSeek)                {                    stream.Position = originalPosition;                }            }        }    public class JsonModel    {        public string type { get; set; }        public string EmployeeID { get; set; }        public string TaskID { get; set; }    }

3:新建一个文本,然后修改其后缀名为.svc,作为我们发布服务(宿主为IIS)让Android手机调用, 然后把下面的代码写入

<%@ ServiceHost Language="C#" Debug="true" Service="Coreius.CEIMS.AndroidService.AndroidInfoService" %>

修改Web.config里面的内容:

<?xml version="1.0" encoding="utf-8"?><configuration>  <appSettings>    <add key="ConnectionString" value="server=127.0.0.1;database=Coreius;uid=sa;pwd=admin"/>  </appSettings>  <system.web>    <compilation debug="true" targetFramework="4.0" />  </system.web>  <system.serviceModel>    <behaviors>      <endpointBehaviors>        <behavior name="webHttp">          <webHttp helpEnabled="true"/>        </behavior>      </endpointBehaviors>      <serviceBehaviors>        <behavior name="MapConfigBehavior">          <!-- 为避免泄漏元数据信息,请在部署前将以下值设置为 false 并删除上面的元数据终结点 -->          <serviceMetadata httpGetEnabled="true"/>          <!-- 要接收故障异常详细信息以进行调试,请将以下值设置为 true。在部署前设置为 false 以避免泄漏异常信息 -->          <serviceDebug includeExceptionDetailInFaults="true"/>          <dataContractSerializer maxItemsInObjectGraph="2147483647"/>        </behavior>      </serviceBehaviors>    </behaviors>    <bindings>      <webHttpBinding>        <binding name="webHttpBindConfig" receiveTimeout="00:30:00" sendTimeout="00:30:00" maxReceivedMessageSize="104857600" transferMode="Streamed">          <readerQuotas maxStringContentLength="2147483647" maxArrayLength="2147483647"/>          <security mode="None"></security>        </binding>      </webHttpBinding>    </bindings>    <services>      <service name="Coreius.CEIMS.AndroidService.AndroidInfoService" behaviorConfiguration="MapConfigBehavior">        <endpoint binding="webHttpBinding" contract="Coreius.CEIMS.AndroidInterface.IAndroidInfo" bindingConfiguration="webHttpBindConfig" behaviorConfiguration="webHttp"/>       </service>    </services>  </system.serviceModel></configuration>

此处有些要注意的地方:

(1):此处采用的是webHttpBinding 所以一定要设置behaviorConfiguration才会有效果,其中helpEnabled="true"则是为实现可以在发布可以查看帮助信息

        <behavior name="webHttp">          <webHttp helpEnabled="true"/>        </behavior>

(2):为了实现上传大文件所以我们要如下设置最大值,其中security是设置访问服务的认证,此处是把它设置成为不认证,transferMode就是设置运用流的模式

      <webHttpBinding>        <binding name="webHttpBindConfig" receiveTimeout="00:30:00" sendTimeout="00:30:00" maxReceivedMessageSize="104857600" transferMode="Streamed">          <readerQuotas maxStringContentLength="2147483647" maxArrayLength="2147483647"/>          <security mode="None"></security>        </binding>      </webHttpBinding>

4:编写完上面的代码后就可以服务器IIS上部署这个WCF服务:

四:Android编码

由于Android手机端的代码是另外一个朋友编写,所以就把大体的代码贴出来,大体的原理就是把参数跟图片写入流(图片进行压缩处理),然后调用部署好的WCF服务

代码一:因为服务器不是公用的,所以下面的IP我就随便修改的一个;

?
private void toUploadFile(File file) throws FileNotFoundException { String result = null ; requestTime= 0; int res = 0; long requestTime = System.currentTimeMillis(); long responseTime = 0; //封装参数信息 JSONObject jsonObject = new JSONObject(); try { jsonObject.put( "EmployeeID" , MainActivity.guid); jsonObject.put( "TaskID" , "e52df9b4-ee3b-46c5-8387-329b76356641" ); String[] type = file.getName().split( "\\." ); jsonObject.put( "type" , type[type.length-1]); } catch (JSONException e) { // TODO Auto-generated catch block e.printStackTrace(); } /**上传文件*/ HttpParams httpParameters = new BasicHttpParams(); HttpConnectionParams.setConnectionTimeout(httpParameters, 1000*30); HttpConnectionParams.setSoTimeout(httpParameters, 1000*30); HttpConnectionParams.setTcpNoDelay(httpParameters, true ); String path = PictureUtil.zipNewImage(file); //压缩文件后返回的文件路径 byte [] bytes = null ; InputStream is ; File myfile = new File(path); try { is = new FileInputStream(path); bytes = new byte [( int ) myfile.length()]; int len = 0; int curLen = 0; while ((len = is .read(bytes)) != -1) { curLen += len; is .read(bytes); } is .close(); } catch (FileNotFoundException e1) { // TODO Auto-generated catch block e1.printStackTrace(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } byte [] updata = GpsImagePackage.getPacket(jsonObject.toString(), bytes); //参数与文件封装成单个数据包 HttpClient httpClient = new DefaultHttpClient(httpParameters); HttpPost httpPost = new HttpPost(MyUrl.upload_file); HttpResponse httpResponse; //单个文件流上传 InputStream input = new ByteArrayInputStream( updata ); InputStreamEntity reqEntity; reqEntity = new InputStreamEntity(input, -1); reqEntity.setContentType( "binary/octet-stream" ); reqEntity.setChunked( true ); httpPost.setEntity(reqEntity); try { httpResponse = httpClient.execute(httpPost); responseTime = System.currentTimeMillis(); this .requestTime = ( int ) ((responseTime-requestTime)/1000); res = httpResponse.getStatusLine().getStatusCode(); if (httpResponse.getStatusLine().getStatusCode() ==200) { Log.e(TAG, "request success" ); Log.e(TAG, "result : " + result); return ; } else { Log.e(TAG, "request error" ); sendMessage(UPLOAD_SERVER_ERROR_CODE, "上传失败:code=" + res); return ; } } catch (ClientProtocolException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } } package com.anthony.util; /** * 服务器端接口 * @author YWJ * */ public class MyUrl { public static String upload_GPS = http: //122.199.19.23:8088/AndroidInfoService.svc/GpsUpFile; }

代码二:

?
package com.anthony.util; public class GpsImagePackage { public GpsImagePackage() { // TODO Auto-generated constructor stub } //封装字节数组与参数 public static byte [] getPacket(String json, byte [] image){ byte [] jsonb = json.getBytes(); int length = image.length + jsonb.length; System. out .println(image.length + " " + jsonb.length); byte [] bytes = new byte [length+1]; byte [] lengthb = InttoByteArray(jsonb.length, 1); System.arraycopy(lengthb, 0, bytes, 0, 1); System.arraycopy(jsonb, 0, bytes, 1, jsonb.length); System.arraycopy(image, 0, bytes, 1+jsonb.length, image.length); return bytes; } //将int转换为字节数组 public static byte [] InttoByteArray( int iSource, int iArrayLen) { byte [] bLocalArr = new byte [iArrayLen]; for ( int i = 0; (i < 4) && (i < iArrayLen); i++) { bLocalArr[i] = ( byte )( iSource>>8*i & 0xFF ); } return bLocalArr; } // 将byte数组bRefArr转为一个整数,字节数组的低位是整型的低字节位 public static int BytestoInt( byte [] bRefArr) { int iOutcome = 0; byte bLoop; for ( int i =0; i<bRefArr.length ; i++) { bLoop = bRefArr[i]; iOutcome+= (bLoop & 0xFF) << (8 * i); } return iOutcome; } }

五:运行效果:

如果,您认为阅读这篇博客让您有些收获,不妨点击一下右下角的【推荐】按钮。 因为,我的写作热情也离不开您的肯定支持。

感谢您的阅读

标签: WCF

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