android如何利用基于Http 协议的WebService服务来获取远程数据库数据

初学android，这个问题困扰了多天，在搜索引擎及论坛各位高手的帮助下，现在终于给搞定了，在这里分享给大家，希望对大家有所帮助！（其实本来是尝试用SOAP协议的，试了n天，无果，无奈又只能回到http了！）先来看看服务器端吧！

首先新建一个ASP.NET Web服务应用程序，我这里将其命名为ShopService，具体代码如下：
C#代码

usingSystem;
usingSystem.Collections;
usingSystem.ComponentModel;
usingSystem.Data;
usingSystem.Linq;
usingSystem.Web;
usingSystem.Web.Services;
usingSystem.Web.Services.Protocols;
usingSystem.Xml.Linq;
usingBLL.Shop;
usingSystem.Web.Script.Services;
namespaceWebService
{
///<summary>
///ShopService的摘要说明
///</summary>
[WebService(Namespace="http://具体的根据你的需要咯/")]
[WebServiceBinding(ConformsTo=WsiProfiles.BasicProfile1_1)]
[ToolboxItem(false)]
//若要允许使用ASP.NETAJAX从脚本中调用此Web服务，请取消对下行的注释。
[System.Web.Script.Services.ScriptService]
publicclassShopService:System.Web.Services.WebService
{
[WebMethod]
//[ScriptMethod(ResponseFormat=ResponseFormat.Json)]
publicstringgetShopItems(stringuserId,inttype)
{
Shopshop=newShop();
returnshop.getShopItems(userId,type);
}
}
}

然后再来看看android客户端，我就直接上代码了
Java代码

packagecom.xxx;
importjava.io.BufferedReader;
importjava.io.InputStream;
importjava.io.InputStreamReader;
importjava.net.HttpURLConnection;
importjava.net.URL;
importorg.apache.http.HttpEntity;
importorg.apache.http.HttpResponse;
importorg.apache.http.client.methods.HttpPost;
importorg.apache.http.entity.StringEntity;
importorg.apache.http.impl.client.DefaultHttpClient;
importorg.apache.http.params.BasicHttpParams;
importorg.apache.http.params.HttpConnectionParams;
importorg.apache.http.params.HttpParams;
importorg.json.JSONObject;
importandroid.graphics.Bitmap;
importandroid.graphics.BitmapFactory;
publicclassWebserviceTookit{
//privatestaticfinalStringTAG="ShopItems";
privatestaticfinalStringWEBSERVICE_IP="http://10.0.2.2:14294";
publicstaticStringgetShopItems(StringuserId,inttype){
try{
//调用带参数的WebMethod
finalStringSERVER_URL=WEBSERVICE_IP
+"/ShopService.asmx/getShopItems";//带参数的WebMethod
HttpPostrequest=newHttpPost(SERVER_URL);//根据内容来源地址创建一个Http请求
request.addHeader("Content-Type","application/json;charset=utf-8");//必须要添加该Http头才能调用WebMethod时返回JSON数据
JSONObjectjsonParams=newJSONObject();
jsonParams.put("userId",userId);//传参
jsonParams.put("type",type);
HttpEntitybodyEntity=newStringEntity(jsonParams.toString(),
"utf8");//参数必须也得是JSON数据格式的字符串才能传递到服务器端，否则会出现"{'Message':'xxx是无效的JSON基元'}"的错误
request.setEntity(bodyEntity);
HttpParamshttpParameters=newBasicHttpParams();
//Setthetimeoutinmillisecondsuntilaconnectionis
//established.
//Thedefaultvalueiszero,thatmeansthetimeoutisnotused.
inttimeoutConnection=3*1000;
HttpConnectionParams.setConnectionTimeout(httpParameters,
timeoutConnection);
//Setthedefaultsockettimeout(SO_TIMEOUT)
//inmillisecondswhichisthetimeoutforwaitingfordata.
inttimeoutSocket=5*1000;
HttpConnectionParams.setSoTimeout(httpParameters,timeoutSocket);
DefaultHttpClienthttpClient=newDefaultHttpClient(httpParameters);
HttpResponsehttpResponse=httpClient.execute(request);//发送请求并获取反馈
//解析返回的内容
if(httpResponse.getStatusLine().getStatusCode()==200)//StatusCode为200表示与服务端连接成功
{
StringBuilderbuilder=newStringBuilder();
BufferedReaderbufferedReader2=newBufferedReader(
newInputStreamReader(httpResponse.getEntity()
.getContent()));
for(Strings=bufferedReader2.readLine();s!=null;s=bufferedReader2.readLine()){
builder.append(s);
}
StringresultString=builder.toString();
resultString=JSONToolkit.removeEscape(resultString);
returnresultString;
}
}catch(Exceptione){
e.printStackTrace();
return"";
}
return"";
}
}

运行时记得关闭防火墙或者添加例外端口~

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