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

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.com260678675@QQ.com806208721@qq.comhr_1985@163.com32575987@qq.comqingchen0501@126.comyingyihanxin@foxmail.com1170382650@qq.com1170382650@qq.comyingyihanxin@foxmail.comqingchen0501@126.com32575987@qq.comhr_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

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();                }            }        }    }}