public static String postData(String url,String postData)抛出SomeCustomException
字符串url的格式应该是什么
返回String是来自服务器的响应,作为json数据的字符串表示.
编辑
目前的连接工具
package my.package;
import my.package.exceptions.CustomException;
import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.URLDecoder;
import org.apache.http.httpentity;
import org.apache.http.HttpResponse;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.DefaultHttpClient;
public class ConnectionUtil {
public static String postData(String url,String postData)
throws CustomException {
// Create a new HttpClient and Post Header
InputStream is = null;
StringBuilder sb = null;
String result = "";
HttpClient httpclient = new DefaultHttpClient();
HttpPost httppost = new HttpPost();
httppost.setHeader("host",url);
Log.v("ConnectionUtil","opening POST connection to URI = " + httppost.getURI() + " url = " + URLDecoder.decode(url));
try {
httppost.setEntity(new StringEntity(postData));
// Execute HTTP Post Request
HttpResponse response = httpclient.execute(httppost);
httpentity entity = response.getEntity();
is = entity.getContent();
} catch (Exception e) {
Log.e("log_tag","Error in http connection " + e.toString());
e.printstacktrace();
throw new CustomException("Could not establish network connection");
}
try {
BufferedReader reader = new BufferedReader(new InputStreamReader(
is,"utf-8"),8);
sb = new StringBuilder();
sb.append(reader.readLine() + "\n");
String line = "0";
while ((line = reader.readLine()) != null) {
sb.append(line + "\n");
}
is.close();
result = sb.toString();
} catch (Exception e) {
Log.e("log_tag","Error converting result " + e.toString());
throw new CustomException("Error parsing the response");
}
Log.v("ConnectionUtil","Sent: "+postData);
Log.v("ConnectionUtil","Got result "+result);
return result;
}
}
Logcat输出
10-16 11:27:27.287: E/log_tag(4935): Error in http connection java.lang.NullPointerException
10-16 11:27:27.287: W/System.err(4935): java.lang.NullPointerException
10-16 11:27:27.287: W/System.err(4935): at org.apache.http.impl.client.AbstractHttpClient.determineTarget(AbstractHttpClient.java:496)
10-16 11:27:27.307: W/System.err(4935): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:487)
10-16 11:27:27.327: W/System.err(4935): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:465)
10-16 11:27:27.327: W/System.err(4935): at in.gharpay.zap.integration.ConnectionUtil.postData(ConnectionUtil.java:92)
10-16 11:27:27.327: W/System.err(4935): at in.gharpay.zap.integration.ZapTransaction$1.doInBackground(ZapTransaction.java:54)
10-16 11:27:27.327: W/System.err(4935): at in.gharpay.zap.integration.ZapTransaction$1.doInBackground(ZapTransaction.java:1)
10-16 11:27:27.327: W/System.err(4935): at android.os.AsyncTask$2.call(AsyncTask.java:185)
10-16 11:27:27.327: W/System.err(4935): at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:306)
10-16 11:27:27.327: W/System.err(4935): at java.util.concurrent.FutureTask.run(FutureTask.java:138)
10-16 11:27:27.327: W/System.err(4935): at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1088)
10-16 11:27:27.327: W/System.err(4935): at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:581)
10-16 11:27:27.327: W/System.err(4935): at java.lang.Thread.run(Thread.java:1019)
10-16 11:27:27.327: V/log_tag(4935): Could not establish network connection
解决方法
// Build the JSON object to pass parameters
JSONObject jsonObj = new JSONObject();
jsonObj.put("username",username);
jsonObj.put("data",dataValue);
// Create the POST object and add the parameters
HttpPost httpPost = new HttpPost(url);
StringEntity entity = new StringEntity(jsonObj.toString(),HTTP.UTF_8);
entity.setContentType("application/json");
httpPost.setEntity(entity);
HttpClient client = new DefaultHttpClient();
HttpResponse response = client.execute(httpPost);
希望这有助于解决您的问题.谢谢.