Java如何获取URL的响应头信息呢？

实现思路:
     借助URLConnection类下的getHeaderField()方法即可返回头文件信息
 

import java.io.IOException;
import java.net.URL;
import java.net.URLConnection;
import java.util.Map;
import java.util.Set;

public class testClass {
    public static void main(String[] args) throws IOException{
        URL u= new URL("http://www.java265.com");
        URLConnection c= u.openConnection();
        
        Map headers = c.getHeaderFields();
        Set<String> keys = headers.keySet();
        for( String key : keys ){
            String val = conn.getHeaderField(key);
            System.out.println(key+"    "+val);
        }
        System.out.println(c.getLastModified() );
    }
}