package test; import java.io.*; import java.net.MalformedURLException; import java.net.URI; import java.net.URL; import java.nio.charset.Charset; import java.sql.SQLClientInfoException; import java.text.DateFormat; import java.text.ParsePosition; import java.text.SimpleDateFormat; import java.util.*; import java.util.concurrent.CountDownLatch; import java.util.regex.Matcher; import java.util.regex.Pattern; import java.util.zip.InflaterInputStream; import javax.annotation.processing.FilerException; import javax.management.RuntimeErrorException; import javax.swing.text.AbstractDocument.LeafElement; import privateclass.Filterby_Name; import privateclass.Filterby_hidden; import privateclass.Filterby_java; import privateclass.MyBufferedReader; import privateclass.Person; public class Main { /* * 正则表达式练习 */ public static void main(String[] args) throws Exception { practise1(); practise2(); practise3(); practise4(); } /* * 治疗口吃 * 我我我我 ...我我.我玉玉.. 玉玉玉树树..树树.临..临临临临风.风风风风 * */ private static void practise1() { String s = "我我我我 ...我我.我玉玉.. 玉玉玉树树..树树.临..临临临临风.风风风风"; s = s.replaceAll("\.", ""); s = s.replaceAll(" ", ""); s = s.replaceAll("(.)\1+", "$1"); System.out.println(s); } /* * 将ip进行排序 * 192.168.100.1 2.2.2.23 100.2.53.3 55.25.26.6 */ private static void practise2() { String s = "192.168.100.1 2.2.2.23 100.2.53.3 55.25.26.6"; s = s.replaceAll("(\d+)", "00$1"); s = s.replaceAll("0*(\d{3})", "$1"); TreeSet<String> ts = new TreeSet<String>(); String []str = s.split(" +"); for(String name :str) { ts.add(name); } for(String name: ts) { System.out.println(name.replaceAll("0*(\d)", "$1")); } } /* * 判断是否是邮箱 */ private static void practise3() { String s = "9861805@qq.com.cn"; String reg = "\w+@\w+(\.\w+)+"; boolean b = s.matches(reg); System.out.println(b); } /* * 网页爬虫找出邮箱 */ private static void practise4() throws Exception { URL url = new URL("https://blog.csdn.net/weixin_39917347/article/details/81707106"); BufferedReader br = new BufferedReader(new InputStreamReader(url.openStream())); Pattern p = Pattern.compile("\w+@\w+(\.\w+)+"); String line = null; while((line = br.readLine()) != null) { Matcher m = p.matcher(line); while(m.find()) { System.out.println(m.group()); } } br.close(); } }