一:抓取网页中的Email地址
利用正则表达式匹配网页中的文本
[\\w[.-]]+@[\\w[.-]]+\\.[\\w]+
将网页内容分割提取
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import java.io.BufferedReader; import java.io.FileNotFoundException; import java.io.FileReader; import java.io.IOException; import java.util.regex.Matcher; import java.util.regex.Pattern; public class EmailSpider { public static void main(String[] args) { try { BufferedReader br = new BufferedReader( new FileReader( "C:\\emailSpider.html" )); String line = "" ; while ((line=br.readLine()) != null ) { parse(line); } } catch (FileNotFoundException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } } private static void parse(String line) { Pattern p = Pattern.compile( "[\\w[.-]]+@[\\w[.-]]+\\.[\\w]+" ); Matcher m = p.matcher(line); while (m.find()) { System.out.println(m.group()); } } } |
打印结果:
867124664@qq.com
260678675@QQ.com
806208721@qq.com
hr_1985@163.com
32575987@qq.com
qingchen0501@126.com
yingyihanxin@foxmail.com
1170382650@qq.com
1170382650@qq.com
yingyihanxin@foxmail.com
qingchen0501@126.com
32575987@qq.com
hr_1985@163.com
现在你找到这么多邮箱地址,用上JavaMail的知识,你可以群发垃圾邮件了,呵呵!!!
二:代码统计
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import java.io.BufferedReader; import java.io.File; import java.io.FileNotFoundException; import java.io.FileReader; import java.io.IOException; public class CodeCounter { static long normalLines = 0 ; //正常代码行 static long commentLines = 0 ; //注释行 static long whiteLines = 0 ; //空白行 public static void main(String[] args) { //找到某个文件夹,该文件夹下面在没有文件夹,这里没有写递归处理不在同一文件夹的文件 File f = new File( "E:\\Workspaces\\eclipse\\Application\\JavaMailTest\\src\\com\\java\\mail" ); File[] codeFiles = f.listFiles(); for (File child : codeFiles){ //只统计java文件 if (child.getName().matches( ".*\\.java$" )) { parse(child); } } System.out.println( "normalLines:" + normalLines); System.out.println( "commentLines:" + commentLines); System.out.println( "whiteLines:" + whiteLines); } private static void parse(File f) { BufferedReader br = null ; //表示是否为注释开始 boolean comment = false ; try { br = new BufferedReader( new FileReader(f)); String line = "" ; while ((line = br.readLine()) != null ) { //去掉注释符/*前面可能出现的空白 line = line.trim(); //空行 因为readLine()将字符串取出来时,已经去掉了换行符\n //所以不是"^[\\s&&[^\\n]]*\\n$" if (line.matches( "^[\\s&&[^\\n]]*$" )) { whiteLines ++; } else if (line.startsWith( "/*" ) && !line.endsWith( "*/" )) { //统计多行/*****/ commentLines ++; comment = true ; } else if (line.startsWith( "/*" ) && line.endsWith( "*/" )) { //统计一行/**/ commentLines ++; } else if ( true == comment) { //统计*/ commentLines ++; if (line.endsWith( "*/" )) { comment = false ; } } else if (line.startsWith( "//" )) { commentLines ++; } else { normalLines ++; } } } catch (FileNotFoundException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } finally { if (br != null ) { try { br.close(); br = null ; } catch (IOException e) { e.printStackTrace(); } } } } } |
以上就是针对java正则表达式的简单应用,希望对大家的学习Java正则表达式有所帮助。