HttpURLConnection使用方法

一.详解

任何网络连接都需要经过socket才能连接，HttpURLConnection不需要设置socket，所以，HttpURLConnection并不是底层的连接，而是在底层连接上的一个请求。这就是为什么HttpURLConneciton只是一个抽象类，自身不能被实例化的原因。HttpURLConnection只能通过URL.openConnection()方法创建具体的实例。

二.代码实现

1.在MyAsyncTask中

package com.example.zhouyf.demo06;import android.content.Context;import android.content.Intent;import android.os.AsyncTask;import android.view.View;import android.widget.AdapterView;import android.widget.ListView;import com.google.gson.Gson;import java.io.BufferedReader;import java.io.InputStream;import java.io.InputStreamReader;import java.io.UnsupportedEncodingException;import java.net.HttpURLConnection;import java.net.MalformedURLException;import java.net.URL;import java.util.List;/** * Created by Zhouyf on 2017/9/7. */public class MyAsyncTask extends AsyncTask<String,Integer,String>{    private Context context;    private ListView listView;    private String path;    private String type;    private DataBean bean;    public MyAsyncTask(Context context, ListView listView, String path, String type) {        this.context = context;        this.listView = listView;        this.path = path;        this.type = type;    }    public void getData(String mpath,String mtype){        try {            URL url = new URL(mpath);            HttpURLConnection connection = (HttpURLConnection) url.openConnection();            connection.setRequestMethod(mtype);            connection.setReadTimeout(5000);            connection.setConnectTimeout(5000);            connection.setDoOutput(true);            String mptname = "key=8d6e3228d25298f13af4fc40ce6c9679&num=10";            connection.getOutputStream().write(mptname.getBytes());            int responseCode = connection.getResponseCode();            if (responseCode==200){                InputStream inputStream = connection.getInputStream();                String s = readText(inputStream,"utf-8");                Gson gson = new Gson();                bean = gson.fromJson(s, DataBean.class);            }        } catch (Exception e) {            e.printStackTrace();        }    }    public String readText(InputStream inputStream,String charset){        try {            InputStreamReader inputStreamReader = new InputStreamReader(inputStream,charset);            BufferedReader buffer = new BufferedReader(inputStreamReader);            String s=null;            StringBuilder builder = new StringBuilder();            while ((s = buffer.readLine())!=null){                builder.append(s);            }            buffer.close();            inputStreamReader.close();            return builder.toString();        } catch (Exception e) {            e.printStackTrace();        }        return null;    }    @Override    protected String doInBackground(String... strings) {        getData(path,type);        return null;    }    @Override    protected void onPostExecute(String s) {        List<DataBean.NewslistBean> newslist = bean.getNewslist();        MyAdapter adapter = new MyAdapter(context, newslist);        listView.setAdapter(adapter);        super.onPostExecute(s);    }}

2.在MainActivity

package com.example.zhouyf.demo06;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.widget.ListView;public class MainActivity extends AppCompatActivity {    private ListView lv;    String path = "https://api.tianapi.com/wxnew/?key=8d6e3228d25298f13af4fc40ce6c9679&num=10";    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        lv = (ListView) findViewById(R.id.lv);        initData(Url.mPath);    }    public void initData(String url){        MyAsyncTask myAsyncTask = new MyAsyncTask(MainActivity.this, lv, url, "GET");        myAsyncTask.execute();    }}

以上只是部分代码,请斟酌使用