我可以使用 HTTP 发布和响应来检索 xml 文件。但是,现在我需要发布一个String
参数以及 URL。以下代码告诉我 HTTP 状态代码不正确(即 500),因此它返回null
,然后我得到一个NullPointerException
.
package com.JobsWebService;
import java.io.IOException;
import java.io.Reader;
import java.io.StringReader;
import java.io.UnsupportedEncodingException;
import java.util.ArrayList;
import java.util.List;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.HttpStatus;
import org.apache.http.NameValuePair;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.protocol.HTTP;
import org.apache.http.util.EntityUtils;
import org.simpleframework.xml.Serializer;
import org.simpleframework.xml.core.Persister;
import android.util.Log;
public class XmlConnection {
private static final String url = "http://www.accuservlite.com/AccumobileWS/TestService.asmx/RyanMB_GetJobs";
private DefaultHttpClient client = new DefaultHttpClient();
String param= "Johnny";
public List<NewJob> RyanMB_GetJobs() {
try {
String xmlData = retrieve(url);
Serializer serializer = new Persister();
Reader reader = new StringReader(xmlData);
ArrayOfNewJob testService = serializer.read(ArrayOfNewJob.class,
reader, false);
Log.i("gary", "Worked");
return testService.NewJob;
} catch (Exception e) {
Log.i("gary", e.toString());
}
return null;
}
// method retrieve
public String retrieve(String url) throws UnsupportedEncodingException {
List<NameValuePair> qparams = new ArrayList<NameValuePair>();
qparams.add(new BasicNameValuePair("Johnny", "Johhny"));
UrlEncodedFormEntity postEntity = new UrlEncodedFormEntity(qparams,
HTTP.UTF_8);
HttpPost getRequest = new HttpPost(url);
getRequest.setEntity(postEntity);
try {
HttpResponse getResponse = client.execute(getRequest);
final int statusCode = getResponse.getStatusLine().getStatusCode();
if (statusCode != HttpStatus.SC_OK) {
return null;
}
HttpEntity getResponseEntity = getResponse.getEntity();
if (getResponseEntity != null) {
return EntityUtils.toString(getResponseEntity);
}
} catch (IOException e) {
Log.i("gary", "Error for URL " + url, e);
getRequest.abort();
}
return null;
}
}