利用java的net包获取网页源文件,使用正则表达式抓取当中的链接地址,因正则表达式学艺不精,下面这个例子中并不能抓取所有情况下的href属性中的链接地址 test.jsp <%@ page contentType="text/html; charset=gb2312" language="java" import="java.util.regex.*" errorPage="" %> <% String sCurrentLine; String sTotalString; sCurrentLine=""; sTotalString=""; java.io.InputStream l_urlStream; java.net.URL l_url = new java.net.URL("http://www.5ja.net"); java.net.HttpURLConnection l_connection = (java.net.HttpURLConnection) l_url.openConnection(); l_connection.connect(); l_urlStream = l_connection.getInputStream(); java.io.BufferedReader l_reader = new java.io.BufferedReader(new java.io.InputStreamReader(l_urlStream)); while ((sCurrentLine = l_reader.readLine()) != null) { sTotalString+=sCurrentLine; } //String regEx = "href=([^\"']*)>"; String regEx ="href=\"([^\"]*)\"";//找出href="****"的链接 Pattern p = Pattern.compile(regEx, Pattern.CASE_INSENSITIVE); Matcher m = p.matcher(sTotalString); int j=0; while(m.find()){ j++; out.println("m.group(" + j + "): " + m.group(0)+"<br>"); } regEx ="href='([^']*)'";//找出href='****'的链接 p = Pattern.compile(regEx, Pattern.CASE_INSENSITIVE);//Pattern.CASE_INSENSITIVE查找忽略大小写 m = p.matcher(sTotalString); while(m.find()){ j++; out.println("m.group(" + j + "): " + m.group(0)+"<br>"); } %> 
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