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());    }  }}

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;//正常代碼行  static long commentLines = 0;//注釋行  static long whiteLines = 0;//空白行    public static void main(String[] args) {    //找到某個文件夾,該文件夾下面在沒有文件夾，這里沒有寫遞歸處理不在同一文件夾的文件    File f = new File("E://Workspaces//eclipse//Application//JavaMailTest//src//com//java//mail");    File[] codeFiles = f.listFiles();    for(File child : codeFiles){      //只統計java文件      if(child.getName().matches(".*//.java$")) {        parse(child);      }    }        System.out.println("normalLines:" + normalLines);    System.out.println("commentLines:" + commentLines);    System.out.println("whiteLines:" + whiteLines);      }  private static void parse(File f) {    BufferedReader br = null;    //表示是否為注釋開始    boolean comment = false;    try {      br = new BufferedReader(new FileReader(f));      String line = "";      while((line = br.readLine()) != null) {        //去掉注釋符/*前面可能出現的空白        line = line.trim();        //空行 因為readLine()將字符串取出來時，已經去掉了換行符/n        //所以不是"^[//s&&[^//n]]*//n$"        if(line.matches("^[//s&&[^//n]]*$")) {          whiteLines ++;        } else if (line.startsWith("/*") && !line.endsWith("*/")) {          //統計多行/*****/          commentLines ++;          comment = true;          } else if (line.startsWith("/*") && line.endsWith("*/")) {          //統計一行/**/          commentLines ++;        } else if (true == comment) {          //統計*/          commentLines ++;          if(line.endsWith("*/")) {            comment = false;          }        } else if (line.startsWith("http://")) {          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();        }      }    }  }}