Android 通过HTTP获取网络资源

 利用HttpURLConnection对象获取网页数据步骤：（建议使用JSON，比较高效率，免去解析xml）

    （1）定义路径URL对象

    （2）打开连接

    （3）设置连接时长、连接方法（GET/POST）

    （4）获取输入流

    （5）解析转化为需要内容

通过xml从网络中获取网页数据：

    public String getContent(String    url)    throws    Exception{

        URL url = new URL("http://www.sohu.com");    //定义路径URL对象
        HttpURLConnection conn = (HttpURLConnection) url.openConnection();    //打开连接
        conn.setConnectTimeout(5* 1000);    //设置连接超时
        conn.setRequestMethod(“GET”);    //以get方式发起请求
        if (conn.getResponseCode() != 200)     

            throw new RuntimeException("请求url失败");
        InputStream is = conn.getInputStream();    //得到网络返回的输入流
        String result = readData(is, "GBK");    //解析获取字符串
        conn.disconnect();

        return    result    ;

    }
     //第一个参数为输入流,第二个参数为字符集编码
    public static String readData(InputStream inSream, String charsetName) throws Exception{
          ByteArrayOutputStream outStream = new ByteArrayOutputStream();
          byte[] buffer = new byte[1024];
          int len = -1;
          while( (len = inSream.read(buffer)) != -1 ){
               outStream.write(buffer, 0, len);
          }
          byte[] data = outStream.toByteArray();
          outStream.close();
          inSream.close();
          return new String(data, charsetName);
     }

通过JSON从网络中获取网页数据：

JSON格式：[{name:"conghua",age:20},{name:"weicong",age:21}]

public    List<Person>    getJSONPerson(String    path)    throws    Exception{

    List<Person>    persons    =    new    ArrayList<Person>()    ;

    URL    url    =    new        URL(path)    ;

    HttpURLConnection    conn    =    (HttpURLConnection)url.openConnection()    ;

    conn.setConnectTimeOut(5*1000)    ;

    conn.setRequestMethod("GET")    ;

    InputStream    is    =    url.getInputStream()    ;

    String    json    =    StreamTool.readInputStream(is)    ;

    JSONArray    array    =    new    JSONArray(json)    ;

    for(int    i=0;    i<array.length();    i++){

        JSONObject    item    =    array.getJSONObject(i)    ;

        Person    person    =    new    Person(item.getString("name"),item.getInt(age))    ;

        persons.add(person)    ;

    }

    return    persons    ;

}

利用HttpURLConnection对象,我们可以从网络中获取文件数据.

     URL url = new URL("http://photocdn.sohu.com/20100125/Img269812337.jpg");
     HttpURLConnection conn = (HttpURLConnection) url.openConnection();
     conn.setConnectTimeout(5* 1000);
     conn.setRequestMethod("GET");
     if (conn.getResponseCode() != 200)

        throw new RuntimeException("请求url失败");
    InputStream is = conn.getInputStream();
     readAsFile(is, "Img269812337.jpg");

     public static void readAsFile(InputStream inSream, File file) throws Exception{
          FileOutputStream outStream = new FileOutputStream(file);
          byte[] buffer = new byte[1024];
          int len = -1;
          while( (len = inSream.read(buffer)) != -1 ){
               outStream.write(buffer, 0, len);
          }
           outStream.close();
          inSream.close();
     }

Android 通过HTTP获取网络资源

原文：http://www.cnblogs.com/xin36933/p/3554078.html