Regular Expressions--—— web crawlers

Web crawler

import java.net.*;import java.io.*;import java.util.regex.*;class findmail{public  Static void main (String[] args)  throws exception{//read stream   associate file//bufferedreader  bin = new bufferedreader (New filereader ("Mail.txt"));//Get the data on the page    need to get the input stream    urlconnection getInputStream () from the web-side to get the input stream Url url = new url ("http/ 127.0.0.1:8080/myweb/mail.html "); Urlconnection conn = url.openconnection (); Bufferedreader bin = new bufferedreader (New inputstreamreader (Conn.getInputStream ())) ; string line = null;//definition   Mailbox   format   regular rule string mailreg =  "\\w{2,13}@\\w {2,5} (\\. [a-z]+) + ";//Regular rule   Package mode   Object Pattern p = pattern.compile (Mailreg);while  ((line =  bin.readline ())!=null) {matcher m = p.matcher (line);//associate a pattern with a string if  (M.find ()) { System.out.println (M.group ());} System.out.prinTLN (line);}}} 

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Regular Expressions--—— web crawlers