Java下通過發送http post請求的代碼

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLEncoder;
import java.util.Map;

import org.apache.http.protocol.HTTP;
import com.everyone.android.callback.ParseCallback;
import com.everyone.android.callback.ResultCallback;
/**

功能描述：通過HTTP協議發送POST請求
@author android_ls
/
public class AsyncHttpPost extends AsyncBaseRequest {
/*
  
  */
 private static final long serialVersionUID = 3L;
public AsyncHttpPost(String url, Map<String, String> parameter,

     ParseCallback handler, ResultCallback requestCallback) {
 super(url, parameter, handler, requestCallback);

}
@Override
 protected InputStream getRequestResult() throws IOException {

 StringBuilder sb = new StringBuilder();
 if(parameter!=null && !parameter.isEmpty()){
     for(Map.Entry<String, String> entry : parameter.entrySet()){
         sb.append(entry.getKey()).append('=')
             .append(URLEncoder.encode(entry.getValue(), HTTP.UTF_8)).append('&');
     }
     sb.deleteCharAt(sb.length()-1);
 }

 // 得到實體的二進制數據
 byte[] entitydata = sb.toString().getBytes();
 URL url = new URL(requestUrl);
 mHttpURLConn = (HttpURLConnection)url.openConnection();
 mHttpURLConn.setRequestMethod("POST");
 mHttpURLConn.setConnectTimeout(5 * 1000);
 // 如果通過post提交數據，必須設置允許對外輸出數據
 mHttpURLConn.setDoOutput(true);
 mHttpURLConn.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
 mHttpURLConn.setRequestProperty("Content-Length", String.valueOf(entitydata.length));
 OutputStream outStream = mHttpURLConn.getOutputStream();
 outStream.write(entitydata);
 outStream.flush();
 outStream.close();
 if(mHttpURLConn.getResponseCode()== HttpURLConnection.HTTP_OK){
     return mHttpURLConn.getInputStream();
 }
 return null;

}


}</pre>