HttpURLConnection联网

Android应用经常会和服务器端交互，这就需要手机客户端发送网络请求，下面介绍四种常用网络请求方式，我这边是通过Android单元测试来完成这四种方法的，还不清楚Android的单元测试的同学们请看Android开发技巧总结中的Android单元测试的步骤一文。

Get方式：

// Get方式请求 public static void requestByGet() throws Exception { String path = "https://reg.163.com/logins.jsp?id=helloworld&pwd=android"; // 新建一个URL对象 URL url = new URL(path); // 打开一个HttpURLConnection连接 HttpURLConnection urlConn = (HttpURLConnection) url.openConnection(); // 设置连接超时时间 urlConn.setConnectTimeout(5 * 1000); // 开始连接 urlConn.connect(); // 判断请求是否成功 if (urlConn.getResponseCode() == HTTP_200) { // 获取返回的数据 byte[] data = readStream(urlConn.getInputStream()); Log.i(TAG_GET, "Get方式请求成功，返回数据如下："); Log.i(TAG_GET, new String(data, "UTF-8")); } else { Log.i(TAG_GET, "Get方式请求失败"); } // 关闭连接 urlConn.disconnect(); }

Post方式：

// Post方式请求 public static void requestByPost() throws Throwable { String path = "http://v.juhe.cn/toutiao/index"; // 请求的参数转换为byte数组 String params = "tyde="+URLEncoder.encode("yule","UTF-8")+"&key="+"608b9fa8caf0b6dc08b9bc4caf7892f8"; byte[] postData = params.getBytes(); // 新建一个URL对象 URL url = new URL(path); // 打开一个HttpURLConnection连接 HttpURLConnection urlConn = (HttpURLConnection) url.openConnection(); // 设置连接超时时间 urlConn.setConnectTimeout(5 * 1000); // Post请求必须设置允许输出 urlConn.setDoOutput(true); // Post请求不能使用缓存 urlConn.setUseCaches(false); // 设置为Post请求 urlConn.setRequestMethod("POST"); urlConn.setInstanceFollowRedirects(true); // 配置请求Content-Type urlConn.setRequestProperty("Content-Type", "application/x-www-form-urlencode"); // 开始连接 urlConn.connect(); // 发送请求参数 DataOutputStream dos = new DataOutputStream(urlConn.getOutputStream()); dos.write(postData); dos.flush(); dos.close(); // 判断请求是否成功 if (urlConn.getResponseCode() == HTTP_200) { InputStream is = http.getInputStream(); byte[] by=new byte[1024]; int i=0; StringBuffer sb=new StringBuffer(); while ((i=is.read(by))!=-1) { Log.i("log",new String(by,0,i)); } } else { Log.i(TAG_POST, "Post方式请求失败"); } }

下载图片：

public class MainActivity extends Activity { private Button mBtn; private ImageView mImg; private String urlstr = "http://img4q.duitang.com/uploads/item/201502/13/20150213134559_2aAdz.thumb.700_0.jpeg"; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); initView(); } private Handler handler = new Handler(){ @Override public void handleMessage(Message msg) { // TODO Auto-generated method stub super.handleMessage(msg); if (msg.what == 1) { Bitmap bit = (Bitmap) msg.obj; mImg.setImageBitmap(bit); } } }; private void initView() { mBtn = (Button) findViewById(R.id.mBtn); mImg = (ImageView) findViewById(R.id.mImg); mBtn.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { new Thread(new Runnable() { @Override public void run() { // TODO Auto-generated method stub try { /*URL url = new URL(urlstr); //打开连接 HttpURLConnection conn = (HttpURLConnection) url.openConnection(); //设置联网超时时间 conn.setConnectTimeout(30*1000); //设置读取时间 conn.setReadTimeout(60*1000); conn.setDoInput(true); conn.setDoOutput(true); //设置请求方法为get conn.setRequestMethod("GET"); //得到输入流 InputStream is = conn.getInputStream(); //缓冲输入流 BufferedInputStream bis = new BufferedInputStream(is); //得到内部SD卡存储路径 String path = Environment.getExternalStorageDirectory() + "/meinv.jpg"; File file = new File(path); //缓冲输出流，(遍历输入流添加到输出流中)把图片存进SD卡内 BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream(file)); byte[] by = new byte[8*1024]; int len = 0; while ((len = bis.read(by))!= -1) { bos.write(by, 0, len); } bos.flush(); bos.close(); bis.close(); is.close(); Bitmap bitmap = BitmapFactory.decodeFile(path);*/ //直接下载图片设置到布局上 URL urll = new URL(urlstr); HttpURLConnection connn=(HttpURLConnection)urll.openConnection(); connn.setDoInput(true); /*connn.connect();*/ InputStream iss =connn.getInputStream(); //缓冲输入流 BufferedInputStream bis = new BufferedInputStream(iss); Bitmap bitmap=BitmapFactory.decodeStream(bis); iss.close(); Message msg = new Message(); msg.what = 1; msg.obj = bitmap; handler.sendMessage(msg); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } } }).start(); } }); } }