URLPost

最新推荐文章于 2022-11-22 14:36:31 发布

原创最新推荐文章于 2022-11-22 14:36:31 发布 · 312 阅读

CC 4.0 BY-SA版权

本文介绍了一个使用Android系统的应用如何通过POST方法向指定URL发送请求并接收返回数据的例子。该应用利用了AsyncTask来实现后台任务处理，通过HttpURLConnection完成HTTP请求。

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);
       }
   }
}