以下实例演示了如何获取指定 URL 的响应头信息:
import java.io.IOException;
import java.net.URL;
import java.net.URLConnection;
import java.util.Map;
import java.util.Set;
public class Main {
public static void main(String[] args) throws IOException{
URL url = new URL("https://www.itzixishi.com");
URLConnection conn = url.openConnection();
Map headers = conn.getHeaderFields();
Set<String> keys = headers.keySet();
for( String key : keys ){
String val = conn.getHeaderField(key);
System.out.println(key+" "+val);
}
System.out.println( conn.getLastModified() );
}
}
以上代码运行输出结果为:
X-Frame-Options DENY
null HTTP/1.1 200 OK
Cache-Control max-age=100
Server nginx
X-Content-Type-Options nosniff
Connection keep-alive
Vary Accept-Encoding
Expires Fri, 01 May 2020 10:27:41 GMT
Content-Length 13319
Date Fri, 01 May 2020 10:26:01 GMT
Content-Type text/html; charset=utf-8
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