android--------HttpURLConnection的get，post和图片加载-白红宇

android--------HttpURLConnection的get，post和图片加载

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发布时间：2019-06-21

本文共 4677 字，大约阅读时间需要 15 分钟。

URLConnection是个抽象类，它有两个直接子类分别是HttpURLConnection和JarURLConnection。另外一个重要的类是URL，通常URL可以通过传给构造器一个String类型的参数来生成一个指向特定地址的URL实例。

JDK自带的请求方式，包名: java.net.HttpURLConnection;

HttpURLConnection请求的类别:

分为二类,GET与POST请求。二者的区别在于：

1: get请求可以获取静态页面，也可以把参数放在URL字串后面，传递给servlet，

2: post与get的不同之处在于post的参数不是放在URL字串里面，而是放在http请求的正文内。

效果图：

1 public class MainActivity extends Activity implements OnClickListener {  2     public static String urls = "http://bajie.zhangwoo.cn/app.php?platform=android&appkey=5a379b5eed8aaae531df5f60b12100cfb6dff2c1";  3   4     private TextView mTextView;  5     private ImageView imagegvoew;  6     String resultStr = "";  7     String resultStr1 = "";  8   9     @Override 10     protected void onCreate(Bundle savedInstanceState) { 11         super.onCreate(savedInstanceState); 12         setContentView(R.layout.activity_main); 13         initView(); 14     } 15  16     private void initView() { 17         findViewById(R.id.btn1).setOnClickListener(this); 18         findViewById(R.id.btn2).setOnClickListener(this); 19         findViewById(R.id.btn3).setOnClickListener(this); 20         mTextView = (TextView) findViewById(R.id.Text); 21         imagegvoew = (ImageView) findViewById(R.id.imagegvoew); 22  23     } 24  25     @Override 26     public void onClick(View v) { 27         switch (v.getId()) { 28         case R.id.btn1: 29             Thread visitBaiduThread = new Thread(new VisitWebRunnable()); 30             visitBaiduThread.start(); 31             try { 32                 visitBaiduThread.join(); 33                 if (!resultStr.equals("")) { 34                     mTextView.setText(resultStr); 35                 } 36             } catch (InterruptedException e) { 37                 // TODO Auto-generated catch block 38                 e.printStackTrace(); 39             } 40             break; 41         case R.id.btn2: 42  43             Thread visitBaiduThreads = new Thread(new VisitWebRunnables()); 44             visitBaiduThreads.start(); 45             try { 46                 visitBaiduThreads.join(); 47                 if (!resultStr1.equals("")) { 48                     mTextView.setText(resultStr1); 49                 } 50             } catch (InterruptedException e) { 51                 // TODO Auto-generated catch block 52                 e.printStackTrace(); 53             } 54             break; 55         case R.id.btn3: 56             new Thread(new Runnable() { 57  58                 @Override 59                 public void run() { 60                     // TODO Auto-generated method stub 61                     new DownImgAsyncTask() 62                             .execute("http://avatar.csdn.net/8/6/0/2_dickyqie.jpg"); 63                 } 64             }).start(); 65  66             break; 67         default: 68             break; 69         } 70  71     } 72  73     class DownImgAsyncTask extends AsyncTask
     
       { 74  75         @Override 76         protected void onPreExecute() { 77             // TODO Auto-generated method stub 78             super.onPreExecute(); 79  80         } 81  82         @Override 83         protected Bitmap doInBackground(String... params) { 84             // TODO Auto-generated method stub 85             Bitmap b = Util.getImageBitmap(params[0]); 86             return b; 87         } 88  89         @Override 90         protected void onPostExecute(Bitmap result) { 91             // TODO Auto-generated method stub 92             super.onPostExecute(result); 93             if (result != null) { 94                 imagegvoew.setImageBitmap(result); 95             } 96         } 97  98     } 99 100     class VisitWebRunnable implements Runnable {101 102         @Override103         public void run() {104             // TODO Auto-generated method stub105             String data = Util.get(urls);106             resultStr = data;107         }108 109     }110 111     class VisitWebRunnables implements Runnable {112 113         @Override114         public void run() {115             // TODO Auto-generated method stub116             Map
      
        params = new HashMap
       
        ();117             params.put("q", "test");118             params.put("showapi_appid", "11548");119             params.put("showapi_timestamp", "20160511151954");120             params.put("showapi_sign", "bb1d15ab7ce646ec87cc89d684ca4bcb");121             String data = Util.post("https://route.showapi.com/32-9", params);122             resultStr1 = data;123         }124 125     }126 }