如何发送WEB页面请求信息

[lickiswallow]

我需要通过程序，将网页请求GET发送给某个网站，从而获得该网站的响应，但是我用下面的程序块却没有得到任何返回信息，也没有报错。
Socket sentRequest = new Socket("www.sina.com",80); //创建到新浪网连接的套接字

OutputStream out = sentRequest.getOutputStream(); //创建输出流
InputStream in = sentRequest.getInputStream(); //创建输入流

PrintStream outStream = new PrintStream(out); //将输出流包装到PrintStream，
// 便于下面的写入请求信息
outStream.println("GET "+"www.sina.com"+" HTTP/1.0");
outStream.println("Host:"+"www.sina.com");
outStream.println("Accept:*/*");
outStream.println("Referer:");
outStream.println();

BufferedReader read=new BufferedReader(new InputStreamReader(in)); //读出
String Line;
while((Line=read.readLine())!=null) //按行读出服务器的响应信息
{
System.out.println(Line);
}
请问有什么问题么？

[lickiswallow]

我按照Cnxiaowei说的方法做了，下面是服务器返回的信息：
HTTP/1.0 400 Bad Request
Server: squid/2.5.STABLE4
Mime-Version: 1.0
Date: Mon, 24 Apr 2006 06:52:10 GMT
Content-Type: text/html
Content-Length: 1189
Expires: Mon, 24 Apr 2006 06:52:10 GMT
X-Squid-Error: ERR_INVALID_URL 0
X-Cache: MISS from xa-193.sina.com.cn
X-Cache-Lookup: NONE from xa-193.sina.com.cn:80
Connection: close

也就是说没有访问成功，页面显示如下：
ERROR
The requested URL could not be retrieved

--------------------------------------------------------------------------------

While trying to retrieve the URL: www.sina.com

The following error was encountered:

Invalid URL
Some aspect of the requested URL is incorrect. Possible problems:

Missing or incorrect access protocol (should be `http://'' or similar)
Missing hostname
Illegal double-escape in the URL-Path
Illegal character in hostname; underscores are not allowed
Your cache administrator is webmaster.



--------------------------------------------------------------------------------

Generated Mon, 24 Apr 2006 06:31:38 GMT by autoinstall.sina.com.cn (squid/2.5.STABLE5)

这里出现了什么问题呢？

[beikexp]

网络估计有问题，我测试通过，outStream.println("GET "+"/"+" HTTP/1.0");

[Cnxiaowei]

outStream.println("GET "+"www.sina.com"+" HTTP/1.0");
如果你想获取sina的主页，写成
outStream.println("GET "+"/"+" HTTP/1.0");
这样

[lickiswallow]

为什么用GET www.sina.com HTTP/1.0不能正确发送请求而必须只能使用GET / HTTP/1.0才能正确发送呢？

如果我想访问网页上的一个链接，那么也要发送请求，那是不是请求的第一行也必须是
GET / HTTP/1.0呢？

[coolmomo]

我想知道将www.sina.com换成IP地址行不行?