通过HttpClient请求webService

由于服务端是用webService开发的，android要调用webService服务获取数据，这里采用的是通过HttpClient发送post请求，获取webService数据。

服务端使用的webService框架是axis2，请求数据之前，要封装一个xml格式，再通过post请求，获取服务端数据。

请求的xml格式如下所示：

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<soap:Envelope xmlns:soap="http://www.w3.org/2003/05/soap-envelope"xmlns:sam="http://user.service.xxx.com">

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   <soap:Header/>

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   <soap:Body>

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      <sam:getUserInfo>

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     <sam:userName>sunlightcs</sam:userName>

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      </sam:getUserInfo>

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   </soap:Body>

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</soap:Envelope>

其中：getUserInfo是方法名，userName是参数名，当然，还可以加多个参数。

下面的代码是向webService发送请求，获取数据，返回的数据是xml形式的，android只要解析xml数据，就可以获得想要的数据了。

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import java.io.IOException;

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import java.io.OutputStream;

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import java.io.OutputStreamWriter;

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import java.io.Writer;

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import org.apache.http.HttpResponse;

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import org.apache.http.client.HttpClient;

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import org.apache.http.client.methods.HttpPost;

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import org.apache.http.entity.ContentProducer;

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import org.apache.http.entity.EntityTemplate;

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import org.apache.http.impl.client.DefaultHttpClient;

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import org.apache.http.util.EntityUtils;

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public class ClientTest {

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    public static void main(String[] args) {

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        ClientTest.httpClientPost();

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    }

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    private static void httpClientPost() {

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        HttpClient client = new DefaultHttpClient();

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        HttpPost post = new HttpPost("http://localhost:8080/xxx/services/userService");

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        try {

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            ContentProducer cp = new ContentProducer() {

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                public void writeTo(OutputStream outstream) throws IOException {

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                    Writer writer = new OutputStreamWriter(outstream, "UTF-8");

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                    /**

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                     * 获取请求的xml格式数据

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                     */

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                    String requestXml = getRequestXml();

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                    writer.write(requestXml);

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                    writer.flush();

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                }

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            };

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            post.setEntity(new EntityTemplate(cp));

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            HttpResponse response = client.execute(post);

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        //打印返回的xml数据

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            System.out.println(EntityUtils.toString(response.getEntity()));

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        } catch (IOException e) {

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            e.printStackTrace();

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        }

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    }

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    private static String getRequestXml(){

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        StringBuilder sb = new StringBuilder("<soap:Envelope xmlns:soap="http://www.w3.org/2003/05/soap-envelope" xmlns:sam="http://user.service.xxx.com">");

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        sb.append("<soap:Header/>");

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        sb.append("<soap:Body>");

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        sb.append("<sam:getUserInfo>");

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        sb.append("<sam:userName>sunlightcs</sam:userName>");

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        sb.append("</sam:getUserInfo>");

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        sb.append("</soap:Body>");

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        sb.append("</soap:Envelope>");

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        return sb.toString();

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    }

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}

返回的数据格式如下：

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<?xml version='1.0' encoding='UTF-8'?>

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<soapenv:Envelope xmlns:soapenv="http://www.w3.org/2003/05/soap-envelope">

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    <soapenv:Body>

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        <ns:getUserInfoResponse xmlns:ns="http://user.service.xxx.com">

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            <ns:return>xxx</ns:return>

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        </ns:getUserInfoResponse>

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    </soapenv:Body>

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</soapenv:Envelope>

其中，<ns:return>内的"xxx"可以是json数据，android只需解析标签<ns:return>里的json数据即可。