利用WCF与Android实现图片上传并传参

时间:2023-03-08 16:58:52

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:

利用WCF与Android实现图片上传并传参
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);
}
}
利用WCF与Android实现图片上传并传参

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

利用WCF与Android实现图片上传并传参
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;
}
}
}
}
利用WCF与Android实现图片上传并传参

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:

利用WCF与Android实现图片上传并传参
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; }
}
利用WCF与Android实现图片上传并传参

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:

利用WCF与Android实现图片上传并传参
<?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>
利用WCF与Android实现图片上传并传参

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:
利用WCF与Android实现图片上传并传参

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:

利用WCF与Android实现图片上传并传参

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