URLPost

package com.example.homework6.internet;

import java.io.BufferedReader;
import java.io.DataOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;

import com.example.homework6.R;

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

public class URLPost extends Activity {

    private TextView textview;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        textview=(TextView) findViewById(R.id.tv_title);
        MyAsyncTask myAsyncTask=new MyAsyncTask();
        myAsyncTask.execute("http://apis.juhe.cn/cook/query","a8cceb02be610927c66a843b6b1421d0"
                ,"西红柿","10","3");
    }

    class MyAsyncTask extends AsyncTask<String, Integer, String>{
        String string=null;
        @Override
        protected String doInBackground(String... params) {
            try {
                URL url=new URL(params[0]);
                HttpURLConnection httpURLConnection=(HttpURLConnection) url.openConnection();
                httpURLConnection.setConnectTimeout(5000);
                httpURLConnection.setReadTimeout(5000);
                httpURLConnection.setRequestMethod("POST");
                httpURLConnection.setDoInput(true);
                httpURLConnection.setDoOutput(true);
                DataOutputStream dataOutputStream=new DataOutputStream(httpURLConnection.getOutputStream());
                String aa="key="+params[1]+"&menu="+params[2]+"&rn="+params[3]+"&pn="+params[4];
                dataOutputStream.write(aa.getBytes());
                dataOutputStream.flush();
                dataOutputStream.close();
                if(httpURLConnection.getResponseCode()==200) {
                    InputStream inputStream=url.openStream();
                    BufferedReader bufferedReader=new BufferedReader(new InputStreamReader(inputStream, "utf-8"));
                    string=bufferedReader.readLine();
                }
            } catch (MalformedURLException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
            return string;
        }
        @Override
        protected void onPostExecute(String result) {
            textview.setText(result);
        }
    }
}