Java HttpURLConnection
Java HttpURLConnection 类是http特定的URLConnection。它仅适用于HTTP协议。
借助HttpURLConnection类，您可以获取任何HTTP URL的信息，例如标头信息，状态代码，响应代码等。
java。 net.HttpURLConnection是URLConnection类的子类。
如何获取HttpURLConnection类的对象
URL类的openConnection()方法返回URLConnection类的对象。语法:
public URLConnection openConnection()throws IOException{
}
您可以按如下所示将其转换为HttpURLConnection类型。
URL url=new URL("http://www.lidihuo.com/java/java-index.html");
HttpURLConnection huc=(HttpURLConnection)url.openConnection();
Java HttpURLConnecton示例
import java.io.*;
import java.net.*;
public class HttpURLConnectionDemo{
public static void main(String[] args){
try{
URL url=new URL("http://www.lidihuo.com/java-tutorial");
HttpURLConnection huc=(HttpURLConnection)url.openConnection();
for(int i=1;i<=8;i++){
System.out.println(huc.getHeaderFieldKey(i)+" = "+huc.getHeaderField(i));
}
huc.disconnect();
}
catch(Exception e){
System.out.println(e);
}
}
}
输出:
Date = Wed, 10 Dec 2014 19:31:14 GMT
Set-Cookie = JSESSIONID=D70B87DBB832820CACA5998C90939D48; Path=/
Content-Type = text/html
Cache-Control = max-age=2592000
Expires = Fri, 09 Jan 2015 19:31:14 GMT
Vary = Accept-Encoding,User-Agent
Connection = close
Transfer-Encoding = chunked
