Android开发基础控件HttpURLConnection网络请求

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1、创建一个URL对象，URL对象中包含url链接地址；
2、调用URL的openConnection()方法创建HttpURLConnection对象；
3、调用HttpURLConnection对象的getInputStream()方法得到一个InputStream对象；
4、网络请求得到的结果已经在得到的这个InputStream流中，解析这个inputStream即可；
5、InputStream转成InputStreamReader对象，再将该Reader对象转成BufferReader对象；
6、BufferReader对象的readLine()方法可以按行读取流中的数据，循环搞定！
7、注意：网络请求只能在子线程中调用！！！
8、关键代码示例

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package com.yusian.httpurlconnction;
 
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
 
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;
 
 
public class MainActivity extends AppCompatActivity {
    private static final String BASE_URL = "http://www.yusian.com/blog";
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        // 网络请求只能在子线程中实现
        new Thread(new Runnable() {
            @Override
            public void run() {
                getDataFromInternet();
            }
        }).start();
    }
 
    public void getDataFromInternet(){
 
        try {
            URL url = new URL(BASE_URL);
            HttpURLConnection connection = (HttpURLConnection) url.openConnection();
            int code = connection.getResponseCode();
            Log.i("SALog", "Code = "+code);
            // Stream-->StreamReader-->Reader
            InputStream input = connection.getInputStream();
            InputStreamReader reader = new InputStreamReader(input);
            BufferedReader buffer = new BufferedReader(reader);
            while (true){
                String string = buffer.readLine();
                if (string == null) break;
                Log.i("SALog", string);
            }
            // 关闭相关类
            reader.close();
            input.close();;
            connection.disconnect();
        }  catch (IOException e) {
            e.printStackTrace();
        }
    }
}
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运行结果：
I/SALog: Code = 302
I/SALog: <!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0//EN">
I/SALog: <html><head>
I/SALog: <title>302 Found</title>
I/SALog: </head><body>
I/SALog: <h1>Found</h1>
I/SALog: <p>The document has moved <a href="http://www.yusian.com/blog/">here</a>.</p>
I/SALog: </body></html>

One thought on “Android开发基础控件HttpURLConnection网络请求”

  1. Pingback: Android基础控件之网络解析JSONObject与JSONArray的基本使用 | 小龙虾博客 (Crayfish)

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