网络编程

        URL url = new URL(path);  
        // GET 必须大写  
        HttpURLConnection conn = (HttpURLConnection) url.openConnection();  
        conn.setRequestMethod("GET");  
        // 超时 5秒  
        conn.setReadTimeout(5 * 1000);  
        InputStream is = conn.getInputStream();  

        ByteArrayOutputStream bos = new ByteArrayOutputStream();  

        byte[] buffer = new byte[1024];  
        int len;  
        while((len = is.read(buffer)) != -1 ) {  
            bos.write(buffer, 0, len);  
        }  

        byte[] data = bos.toByteArray();  
        File file = new File("zhiling.jpg");  

        FileOutputStream fos = new FileOutputStream(file);  
        fos.write(data);  
        fos.close();