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分享痛苦流涕，为何这个小程序执行不了...(有关URLConncetion)？
public static void main(String[] args)
{
try
{
String urlName = "http://www.sina.com.cn";
URL url = new URL(urlName);
URLConnection connection = URL.openConnection();
connection.connect();
int n = 1;
String key;
while ((key = connection.getHeaderFieldKey(n)) != null)
{
String value = connection.getHeaderField(n);
System.out.println(key + ": " + value);
n++;
}
}
catch (IOException exception)
{
exception.printStackTrace();
}
}
每次都报错说连接超时！
{
try
{
String urlName = "http://www.sina.com.cn";
URL url = new URL(urlName);
URLConnection connection = URL.openConnection();
connection.connect();
int n = 1;
String key;
while ((key = connection.getHeaderFieldKey(n)) != null)
{
String value = connection.getHeaderField(n);
System.out.println(key + ": " + value);
n++;
}
}
catch (IOException exception)
{
exception.printStackTrace();
}
}
每次都报错说连接超时！
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