url3.java

使用URLCONNECTION对象访问远程文件

import java.net.*;
import java.io.*;
import java.util.Date;
public class URL3
{
    public static void main(String args[])
    {
        String urlname = "http://www.edu.cn/index.html";
        if (args.length>0)
            urlname = args[0];
        new URL3().display(urlname);
    }
    public void display(String urlname)
    {
        try
        {
            URL url = new URL(urlname);
            URLConnection uc = url.openConnection();
            System.out.println("当前日期: "+new Date(uc.getDate())+
                        "\r\n"+"文件类型: "+uc.getContentType()+"\r\n"+
                        "修改日期: "+new Date(uc.getLastModified()));
            int c, len;
            len = uc.getContentLength();           //获取文件长度
            System.out.println("文件长度: "+len);
            if(len>0)
            {
                System.out.println("文件内容：");
                InputStream in = uc.getInputStream();  //建立数据输入流
                int i = len;
                while(((c=in.read())!=-1) && (i>0))
                {                                  //按字节读取所有内容
                    System.out.print((char)c);
                    i--;
                }
            }
        }
        catch(MalformedURLException me)
        {
            System.out.println(me);
        }
        catch(IOException ioe)
        {
            System.out.println(ioe);
        }
    }
}