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(5000);
            urlConnection.setReadTimeout(5000);
            if(urlConnection.getResponseCode()==200){
                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(5000);
            urlConnection.setReadTimeout(5000);
            if(urlConnection.getResponseCode()==200){
                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[0];
            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);
        }
        
    }

}