Java下通过发送http post请求的代码

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：通过HTTP协议发送POST请求
 * @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);
        }
          
        // 得到实体的二进制数据
        byte[] entitydata = sb.toString().getBytes();
        URL url = new URL(requestUrl);
        mHttpURLConn = (HttpURLConnection)url.openConnection();
        mHttpURLConn.setRequestMethod("POST");
        mHttpURLConn.setConnectTimeout(5 * 1000);
        // 如果通过post提交数据，必须设置允许对外输出数据
        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;
    }
  
}