AsyncTask异步交互和httpurlconnection结合使用

//网络请求数据

package com.baidu.myutils;

import java.io.BufferedReader;

import java.io.InputStreamReader;

import java.net.HttpURLConnection;

import java.net.MalformedURLException;

import java.net.URL;

import android.content.Context;

import android.net.ConnectivityManager;

import android.net.NetworkInfo;

public class MyUtils {

    //设置请求方式

    public static String Json_url="http://93.gov.cn/93app/get_search.do?key=%E4%B9%9D%E4%B8%89&startNum=0";

    //判断网络是否连接

    public static boolean Netisavilable(Context context){

        //获得网络管理

        ConnectivityManager cManager=(ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);

        //获得网络详情

        NetworkInfo networkInfo=cManager.getActiveNetworkInfo();

        if(networkInfo==null||!networkInfo.isAvailable()){

            return false;

        }

        return true;

    }

    public static String check_j(String url){

        String str="";

        StringBuffer sb=new StringBuffer(Json_url);

        try {

            //创建url

            URL myurl=new URL(sb.toString());

            HttpURLConnection urlConnection=(HttpURLConnection) myurl.openConnection();

            urlConnection.setConnectTimeout();

            urlConnection.setReadTimeout();

            if(urlConnection.getResponseCode()==){

                BufferedReader br=new BufferedReader

                (new InputStreamReader

                        (urlConnection.getInputStream(),"utf-8"));

                str=br.readLine();

            }

        } catch (Exception e) {

            // TODO Auto-generated catch block

            e.printStackTrace();

        }

        return str;

    }

}

package com.baidu.myutils;

import java.io.BufferedReader;

import java.io.InputStreamReader;

import java.net.HttpURLConnection;

import java.net.MalformedURLException;

import java.net.URL;

import android.content.Context;

import android.net.ConnectivityManager;

import android.net.NetworkInfo;

public class MyUtils {

    //设置请求方式

    public static String Json_url="http://93.gov.cn/93app/get_search.do?key=%E4%B9%9D%E4%B8%89&startNum=0";

    //判断网络是否连接

    public static boolean Netisavilable(Context context){

        //获得网络管理

        ConnectivityManager cManager=(ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);

        //获得网络详情

        NetworkInfo networkInfo=cManager.getActiveNetworkInfo();

        if(networkInfo==null||!networkInfo.isAvailable()){

            return false;

        }

        return true;

    }

    public static String check_j(String url){

        String str="";

        StringBuffer sb=new StringBuffer(Json_url);

        try {

            //创建url

            URL myurl=new URL(sb.toString());

            HttpURLConnection urlConnection=(HttpURLConnection) myurl.openConnection();

            urlConnection.setConnectTimeout();

            urlConnection.setReadTimeout();

            if(urlConnection.getResponseCode()==){

                BufferedReader br=new BufferedReader

                (new InputStreamReader

                        (urlConnection.getInputStream(),"utf-8"));

                str=br.readLine();

            }

        } catch (Exception e) {

            // TODO Auto-generated catch block

            e.printStackTrace();

        }

        return str;

    }

}

//解析数据  AsyncTask异步交互

package combaidu.zong;

import java.util.List;

import com.baidu.adapter.MyAdapter;

import com.baidu.myutils.MyUtils;

import com.baidu.vo.MyData;

import com.baidu.vo.MyNews;

import com.google.gson.Gson;

import android.os.AsyncTask;

import android.os.Bundle;

import android.app.Activity;

import android.database.CursorJoiner.Result;

import android.view.Menu;

import android.widget.ListView;

public class MainActivity extends Activity {

    // http://93.gov.cn/93app/get_search.do?key=%E4%B9%9D%E4%B8%89&startNum=0

    private ListView lv;

    private List<MyData> list;

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        init();

    }

    private void init() {

        //找到相应的控件

        lv = (ListView) findViewById(R.id.lv);

        new MyTask().execute(MyUtils.Json_url);

    }

    class MyTask extends AsyncTask<String, String , String>{

        @Override

        protected String doInBackground(String... params) {

            // TODO Auto-generated method stub

            String str=params[];

            String jstr=MyUtils.check_j(str);

            return jstr;

        }

        @Override

        protected void onPostExecute(String result) {

            System.out.println(result+"--------------");

            Gson g=new Gson();

            MyNews myNews=g.fromJson(result, MyNews.class);

            list = myNews.getList();

            System.out.println(list+"-------集合为：-------");

            lv.setAdapter(new MyAdapter(MainActivity.this,list));

            super.onPostExecute(result);

        }

    }

}