简单Android HttpURLConnectionGet方式

Android 使用Http 链接获取数据的方式有两种一个是HttpURLConnection 另一个是HttpClient。

每一种都有两种传输方式：GET 和 POST；（另外还有专门的HttpGet 和HttpPost 方式）

其二者区别：

GET请求请提交的数据放置在HTTP请求协议头中(http://www.xxx.com/xxx?action="xxx"&action2="xxx");而POST提交的数据则放在实体数据中(使用NameValuePair来保存要传递的Post参数)；
GET方式提交的数据最多只能有1024字节，而POST则没有此限制；

这里主要介绍 HttpConnection 的子类 HttpURLConnection；

核心代码：

View Code

 1 URL url = new URL(urlString);  
 2         HttpURLConnection urlConn=(HttpURLConnection)url.openConnection();
 3         //设置超时时间
 4         urlConn.setConnectTimeout(1000);
 5         //链接状态
 6         int code = urlConn.getResponseCode();
 7         if(code == HttpURLConnection.HTTP_OK){
 8              //得到读取的内容(流)  
 9             InputStreamReader in = new InputStreamReader(urlConn.getInputStream());  
10             // 为输出创建BufferedReader  
11             BufferedReader buffer = new BufferedReader(in);  
12             String inputLine = null;  
13             //使用循环来读取获得的数据  
14             while (((inputLine = buffer.readLine()) != null))  
15             {  
16                 //我们在每一行后面加上一个"\n"来换行  
17                 resultData += inputLine + "\n";  
18             }    
19             //关闭InputStreamReader  
20             in.close(); 
21         }
22         //关闭http连接  
23         urlConn.disconnect();

这个是HttpURLConnection 的Get的方式，无需设置，默认为Get方式，如要Post方式则 setDoOutput(ture) ,其他方式(OPTIONS, HEAD, PUT, DELETEand TRACE) 则使用setRequestMethod(String).

全部代码：

View Code

 1 public class HttpConnActivity extends Activity {
 2     
 3       String googleWeatherUrl2 = "http://m.weather.com.cn/data/101010100.html";
 4     private String resultData = null;
 5     @Override
 6     public void onCreate(Bundle savedInstanceState) {
 7         super.onCreate(savedInstanceState);
 8         setContentView(R.layout.activity_json);
 9         Thread mThread = new Thread(GetWeatherDataThread);
10         mThread.start();
11     }
12     
13     private Runnable  GetWeatherDataThread = new Runnable() {
14         
15         @Override
16         public void run() {
17             // TODO Auto-generated method stub
18             try {
19                 getWeatherData();
20             } catch (IOException e) {
21                 // TODO Auto-generated catch block
22                 e.printStackTrace();
23             }
24             mHandler.sendEmptyMessage(0);
25         }
26     };
27     
28     Handler mHandler = new Handler(){
29 
30         @Override
31         public void handleMessage(Message msg) {
32             // TODO Auto-generated method stub
33             super.handleMessage(msg);
34             if(msg.what == 0){
35                 System.out.println(resultData);
36                 System.out.println("线程结束");
37             }
38         }
39         
40     };
41     
42     public void getWeatherData() throws IOException {
43         URL url = new URL(googleWeatherUrl2);  
44         HttpURLConnection urlConn=(HttpURLConnection)url.openConnection();
45         urlConn.setConnectTimeout(1000);
46         int code = urlConn.getResponseCode();
47         if(code == HttpURLConnection.HTTP_OK){
48              //得到读取的内容(流)  
49             InputStreamReader in = new InputStreamReader(urlConn.getInputStream());  
50             // 为输出创建BufferedReader  
51             BufferedReader buffer = new BufferedReader(in);  
52             String inputLine = null;  
53             //使用循环来读取获得的数据  
54             while (((inputLine = buffer.readLine()) != null))  
55             {  
56                 //我们在每一行后面加上一个"\n"来换行  
57                 resultData += inputLine + "\n";  
58             }    
59             //关闭InputStreamReader  
60             in.close(); 
61         }
62         //关闭http连接  
63         urlConn.disconnect();
64     }
65     @Override
66     public boolean onCreateOptionsMenu(Menu menu) {
67         getMenuInflater().inflate(R.menu.activity_json, menu);
68         return true;
69     }
70 }