Java 网络编程之（解析URL）

在 http1.1 协议中，都是基于请求和响应的模式，又是基于 TCP 来进行数据交换的。在 http1.1 中，请求方向远端服务器发送一个请求，请求的内容包括 http 头部信息和可选的内容。然后服务器接到请求，将数据通过 TCP 以流的形式传递到客户端，然后浏览器获取 htm 文档后将其转换为我们所看到的页面。

基于这个原理，我想到了我们是否可以自己编写一个客户端，然后将请求以 socket 输出流的形式写过去呢？结果实验证明我陈功啦，哈哈，这个思路和源码我绝对没有参照任何人，也绝没有百度谷歌。我好像感觉我找到了学习 Java 正确思路……小激动一下！

晒晒源码：

import java.io.BufferedReader;<br /> import java.io.InputStreamReader;<br /> import java.io.OutputStreamWriter;<br /> import java.io.PrintWriter;<br /> import java.net.Socket;<br /> public class GetHtml {<br /> public static void main(String[] args) throws Exception {<br /> Socket socket = new Socket("www.it315.org", 80);<br /> PrintWriter pw = new PrintWriter(new OutputStreamWriter(socket<br /> .getOutputStream()));<br /> pw.println("GET //contact.htm HTTP//1.1");<br /> pw.println("Host:");<br /> pw.println("");<br /> pw.flush();<br /> BufferedReader br = new BufferedReader(new InputStreamReader(socket<br /> .getInputStream()));<br /> char[] ch = new char[1024];<br /> String receive = null;<br /> StringBuffer sb = new StringBuffer();<br /> while (br.read(ch) != -1) {<br /> sb.append(ch);<br /> }<br /> receive = sb.toString();<br /> br.close();<br /> pw.close();<br /> socket.close();<br /> System.out.println(receive);<br /> }<br /> }<br />

运行结果与我们在浏览器上查看源码的结果是一样的：

HTTP/1.1 200 OK<br /> Date: Mon, 27 Jun 2011 15:58:04 GMT<br /> Set-Cookie: clientlanguage=zh_CN; Path=/<br /> Content-Type: text/html;charset=UTF-8<br /> Content-Language: zh-CN<br /> Connection: close<br /> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><br /> <html xmlns="http://www.w3.org/1999/xhtml"><br /> <head><br /> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /><br /> <title>联系我们 - 程序员网校 IT315.org</title><br /> <meta http-equiv="keywords" content="联系程序员网校,程序员网校地址,程序员网址,程序员网校邮箱,程序员网校电话"/><br /> <meta http-equiv="description" content="如果您有什么想好或者对我们有什么建议都可以通过程序员网校网站上的联系方式联系我们。"/><br /> <mce:script src="/r/cms/jquery.js" mce_src="r/cms/jquery.js" type="text/javascript"></mce:script><br /> <mce:script src="/r/cms/front.js" mce_src="r/cms/front.js" type="text/javascript"></mce:script><br /> <mce:script src="/r/cms/www/red/js/common.js" mce_src="r/cms/www/red/js/common.js" 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