public void init() {
try {
url = new URL(urlStr);
// 创建一个代理服务器对象
proxy = new Proxy(Proxy.Type.HTTP, new InetSocketAddress(proxyAddress, proxyPort));
// 使用指定的代理服务器打开连接
conn = url.openConnection(proxy);
// 设置超时时长。
conn.setConnectTimeout(5000);
scan = new Scanner(conn.getInputStream());
// 初始化输出流
ps = new PrintStream("Index.htm");
while (scan.hasNextLine()) {
String line = scan.nextLine();
// 在控制台输出网页资源内容
System.out.println(line);
// 将网页资源内容输出到指定输出流
ps.println(line);
}
} catch (MalformedURLException ex) {
System.out.println(urlStr + "不是有效的网站地址！");
} catch (IOException ex) {
ex.printStackTrace();
}
// 关闭资源
finally {
if (ps != null) {
ps.close();
}
}
}
/**
* Determine if a host is reachable by attempting to resolve the host name, and then attempting to
* open a connection.
*
* @param hostName Name of the host to connect to.
* @return {@code true} if a the host is reachable, {@code false} if the host name cannot be
* resolved, or if opening a connection to the host fails.
*/
protected static boolean isHostReachable(String hostName) {
try {
// Assume host is unreachable if we can't get its dns entry without getting an exception
//noinspection ResultOfMethodCallIgnored
InetAddress.getByName(hostName);
} catch (UnknownHostException e) {
String message = Logging.getMessage("NetworkStatus.UnreachableTestHost", hostName);
Logging.verbose(message);
return false;
} catch (Exception e) {
String message = Logging.getMessage("NetworkStatus.ExceptionTestingHost", hostName);
Logging.verbose(message);
return false;
}
// Was able to get internet address, but host still might not be reachable because the address
// might have been
// cached earlier when it was available. So need to try something else.
URLConnection connection = null;
try {
URL url = new URL("http://" + hostName);
Proxy proxy = WWIO.configureProxy();
if (proxy != null) connection = url.openConnection(proxy);
else connection = url.openConnection();
connection.setConnectTimeout(2000);
connection.setReadTimeout(2000);
String ct = connection.getContentType();
if (ct != null) return true;
} catch (IOException e) {
String message = Logging.getMessage("NetworkStatus.ExceptionTestingHost", hostName);
Logging.info(message);
} finally {
if (connection instanceof HttpURLConnection) ((HttpURLConnection) connection).disconnect();
}
return false;
}