如何进行同步或异步HTTP发布/获取

Question

我需要Sync或Async HTTP Post/Get来从Web服务获取HTML数据.我搜索整个互联网,但我不能给出好的结果.

我试着用这个例子:

• Android系列获取/发布和多个帖子请求
• Jcabi.com
• 在android中执行HTTP Post请求

但他们没有为我工作.

HttpClient并且HttpGet是错误的,错误是:

"org.apache.http.client.HttpClient已弃用"

码:

try
{
    HttpClient client = new DefaultHttpClient();
    String getURL = "google.com";
    HttpGet get = new HttpGet(getURL);
    HttpResponse responseGet = client.execute(get);
    HttpEntity resEntityGet = responseGet.getEntity();
    if (resEntityGet != null)
    {
        //do something with the response 
    }
}
catch (Exception e)
{
    e.printStackTrace();
}

Answer 1

我在下面发布的示例基于我在Android Developer Docs上找到的示例.你可以在这里找到这个例子,看看它是一个更全面的例子.

您将能够使用以下内容发出任何http请求

import android.app.Activity;
import android.os.AsyncTask;
import android.os.Bundle;
import android.util.Log;
import android.widget.Toast;

import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.Reader;
import java.io.UnsupportedEncodingException;
import java.net.HttpURLConnection;
import java.net.URL;

public class MainActivity extends Activity {
    private static final String TAG = MainActivity.class.getSimpleName();

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        new DownloadTask().execute("http://www.google.com/");
    }

    private class DownloadTask extends AsyncTask<String, Void, String> {

        @Override
        protected String doInBackground(String... params) {
            //do your request in here so that you don't interrupt the UI thread
            try {
                return downloadContent(params[0]);
            } catch (IOException e) {
                return "Unable to retrieve data. URL may be invalid.";
            }
        }

        @Override
        protected void onPostExecute(String result) {
            //Here you are done with the task
            Toast.makeText(MainActivity.this, result, Toast.LENGTH_LONG).show();
        }
    }

    private String downloadContent(String myurl) throws IOException {
        InputStream is = null;
        int length = 500;

        try {
            URL url = new URL(myurl);
            HttpURLConnection conn = (HttpURLConnection) url.openConnection();
            conn.setReadTimeout(10000 /* milliseconds */);
            conn.setConnectTimeout(15000 /* milliseconds */);
            conn.setRequestMethod("GET");
            conn.setDoInput(true);
            conn.connect();
            int response = conn.getResponseCode();
            Log.d(TAG, "The response is: " + response);
            is = conn.getInputStream();

            // Convert the InputStream into a string
            String contentAsString = convertInputStreamToString(is, length);
            return contentAsString;
        } finally {
            if (is != null) {
                is.close();
            }
        }
    }

    public String convertInputStreamToString(InputStream stream, int length) throws IOException, UnsupportedEncodingException {
        Reader reader = null;
        reader = new InputStreamReader(stream, "UTF-8");
        char[] buffer = new char[length];
        reader.read(buffer);
        return new String(buffer);
    }
}

您可以使用代码来满足您的需求