这里举一个简单的例子，使用socket来模拟一段http访问百度代码
封装的工具类如下，方法叫XHttp()
package com.spider.net;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.net.Socket;
import java.net.UnknownHostException;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class NetUtil {
public static final int FORMAT_IMAGE=1;
public static final int FORMAT_VIDEO=2;
public static final int FORMAT_TEXT=3;
public static String Http(String url)
{
return null;
}
public static String XHttp(String url,int port)
{
String ret = null;
Socket mSocket=null;
OutputStream os=null;
InputStream ins=null;
try {
String host=getHost(url);
mSocket=new Socket(host, port);
os=mSocket.getOutputStream();
ins=mSocket.getInputStream();
StringBuffer sb=new StringBuffer();
sb.append("GET ").append(url).append(" HTTP/1.1").append("\r\n");
sb.append("Host").append(": ").append(host).append("\r\n");
sb.append("Connection").append(": ").append("Close").append("\r\n");
sb.append("Accept").append(": ").append("*/*").append("\r\n");
sb.append("\r\n");//end
os.write(sb.toString().getBytes());
os.flush();
sb=new StringBuffer();
BufferedReader br=new BufferedReader(new InputStreamReader(ins));
String str=null;
while((str=br.readLine())!=null)
{
sb.append(str);
System.out.println(str);
};
br.close();
ret=sb.toString();
} catch (UnknownHostException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}finally{
if(null!=mSocket)
{
try {
mSocket.close();
} catch (IOException e) {
e.printStackTrace();
}
}
if(null!=os)
{
try {
os.close();
} catch (IOException e) {
e.printStackTrace();
}
}
if(null!=ins)
{
try {
ins.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
return ret;
}
public static String getHost(String url)
{
Pattern p = Pattern.compile("(http://|https://)?([^/]*)",Pattern.CASE_INSENSITIVE);
Matcher m = p.matcher(url);
return m.find()?m.group(2):url;
}
}
package com.spider.test;
import com.spider.net.NetUtil;
public class TestMain {
/**
* @param args
*/
public static void main(String[] args) {
NetUtil.XHttp("http://www.baidu.com", 80);
}
}
HTTP/1.1 200 OK
Date: Sat, 17 May 2014 12:55:12 GMT
Server: Apache
P3P: CP=" OTI DSP COR IVA OUR IND COM "
P3P: CP=" OTI DSP COR IVA OUR IND COM "
Set-Cookie: BAIDUID=7EF751AE135FF261360F9E448B0F01F2:FG=1; expires=Sun, 17-May-15 12:55:12 GMT; max-age=31536000; path=/; domain=.baidu.com; version=1
Set-Cookie: BAIDUID=7EF751AE135FF261C97AD369F7B6986E:FG=1; expires=Sun, 17-May-15 12:55:12 GMT; max-age=31536000; path=/; domain=.baidu.com; version=1
Last-Modified: Tue, 31 Dec 2013 11:13:44 GMT
ETag: "1cdb-4eed2a7498a00"
Accept-Ranges: bytes
Content-Length: 7387
Cache-Control: max-age=1
Expires: Sat, 17 May 2014 12:55:13 GMT
Vary: Accept-Encoding,User-Agent
Connection: Close
Content-Type: text/html
<!doctype html><html><head><meta http-equiv="Content-Type" content="text/html;charset=gb2312"><title>?????￡??????? </title><style>html{overflow-y:auto}body{font:12px arial;text-align:center;background:#fff}body,p,form,ul{margin:0;padding:0}body,form,#fm{position:relative}td{text-align:left}img{border:0}a{color:#00c}a:active{color:#f60}#u{padding:7px 10px 3px 0;text-align:right}#m{width:680px;margin:0 auto}#nv{font-size:16px;margin:0 0 4px;text-align:left;text-indent:117px}#nv a,#nv b,.btn,#lk{font-size:14px}#fm{padding-left:90px;text-align:left}#kw{width:404px;height:22px;padding:4px 7px;padding:6px 7px 2px\9;font:16px arial;background:url(http://www.baidu.com/img/i-1.0.0.png) no-repeat -304px 0;_background-attachment:fixed;border:1px solid #cdcdcd;border-color:#9a9a9a #cdcdcd #cdcdcd #9a9a9a;vertical-align:top}.btn{width:95px;height:32px;padding:0;padding-top:2px\9;border:0;background:#ddd url(http://www.baidu.com/img/i-1.0.0.png) no-repeat;cursor:pointer}.btn_h{background-position:-100px 0}#kw,.btn_wr{margin:0 5px 0 0}.btn_wr{width:97px;height:34px;display:inline-block;background:url(http://www.baidu.com/img/i-1.0.0.png) no-repeat -202px 0;_top:1px;*position:relative}#lk{margin:33px 0}#lk span{font:14px "????"}#lm{height:60px}#lh{margin:16px 0 5px;word-spacing:3px}#mCon{height:18px;line-height:18px;position:absolute;right:7px;top:8px;top:10px\9;cursor:pointer;padding:0 18px 0 0;background:url(http://www.baidu.com/img/bg-1.0.0.gif) no-repeat right -134px;background-position:right -136px\9}#mCon span{color:#00c;cursor:default;display:block}#mCon .hw{text-decoration:underline;cursor:pointer}#mMenu{width:56px;border:1px solid #9a99ff;list-style:none;position:absolute;right:7px;top:28px;display:none;background:#fff}#mMenu a{width:100%;height:100%;display:block;line-height:22px;text-indent:6px;text-decoration:none}#mMenu a:hover{background:#d9e1f6}#mMenu .ln{height:1px;background:#ccf;overflow:hidden;margin:2px;font-size:1px;line-height:1px}#cp,#cp a{color:#77c}#sh{display:none;behavior:url(#default#homepage)}</style></head>
<body><p id="u"><a href="/gaoji/preferences.html">????????</a> | <a href="http://passport.baidu.com/?login&tpl=mn">???</a></p><div id="m"><p id="lg"><img src="http://www.baidu.com/img/baidu_sylogo1.gif" width="270" height="129" usemap="#mp"></p><p id="nv"><a href="http://news.baidu.com">?? ??</a>??<b>?? ?</b>??<a href="http://tieba.baidu.com">?? ??</a>??<a href="http://zhidao.baidu.com">? ??</a>??<a href="http://mp3.baidu.com">MP3</a>??<a href="http://image.baidu.com">? ?</a>??<a href="http://video.baidu.com">?? ?</a>??<a href="http://map.baidu.com">?? ?</a></p><div id="fm"><form name="f" action="/s"><input type="text" name="wd" id="kw" maxlength="100"><input type="hidden" name="rsv_bp" value="0"><span class="btn_wr"><input type="submit" value="??????" id="su" class="btn" onmousedown="this.className=‘btn btn_h‘" onmouseout="this.className=‘btn‘"></span></form><div id="mCon"><span>????</span></div><ul id="mMenu"><li><a href="#" name="ime_hw">??д</a></li><li><a href="#" name="ime_py">???</a></li><li class="ln"></li><li><a href="#" name="ime_cl">???</a></li></ul></div>
<p id="lk"><a href="http://hi.baidu.com">???</a>??<a href="http://baike.baidu.com">???</a>??<a href="http://www.hao123.com">hao123</a><span> | <a href="/more/">???>></a></span></p><p id="lm"></p><p><a id="sh" onClick="this.setHomePage(‘http://www.baidu.com/‘)" href="http://utility.baidu.com/traf/click.php?id=215&url=http://www.baidu.com" onmousedown="return ns_c({‘fm‘:‘behs‘,‘tab‘:‘homepage‘,‘pos‘:0})">??????????</a></p><p id="lh"><a href="http://e.baidu.com/?refer=888">?????????</a> | <a href="http://top.baidu.com">?????????</a> | <a href="http://home.baidu.com">??????</a> | <a href="http://ir.baidu.com">About Baidu</a></p><p id="cp">©2014 Baidu <a href="/duty/">??e??????</a> <a href="http://www.miibeian.gov.cn" target="_blank">??ICP?030173??</a> <img src="http://gimg.baidu.com/img/gs.gif"></p></div><map name="mp"><area shape="rect" coords="40,25,230,95" href="http://hi.baidu.com/baidu/" target="_blank" title="?????? ??????" ></map></body>
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</html>
说明访问成功，想要扩展更加详细的使用方法，建议熟悉HTTP的协议！
使用它的好处是，当没有必要传递的参数，我们可以不需要传递，省流量；麻烦之处是，你需要深入了解Http的协议。
使用socket模拟Http请求,布布扣,bubuko.com
原文地址：http://blog.csdn.net/zz7zz7zz/article/details/26094683
