java删除指定文件

package th.deletePic.service;

import java.io.BufferedInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.Calendar;
import java.util.Properties;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

import javax.swing.JOptionPane;

@SuppressWarnings("serial")
public class DeletePic {

 @SuppressWarnings("unchecked")
 public static File[] getFiles(String dir, String s) {
  File file = new File(dir);

  s = s.replace('.', '#');
  s = s.replaceAll("#", "\\\\.");
  s = s.replace('*', '#');
  s = s.replaceAll("#", ".*");
  s = s.replace('?', '#');
  s = s.replaceAll("#", ".?");
  s = "^" + s + "$";

  Pattern p = Pattern.compile(s);
  ArrayList list = filePattern(file, p);
  if (list == null || list.size() == 0) {
   return null;
  }
  File[] rtn = new File[list.size()];
  list.toArray(rtn);
  return rtn;
 }

 @SuppressWarnings("unchecked")
 private static ArrayList filePattern(File file, Pattern p) {
  if (file == null) {
   return null;
  } else if (file.isFile()) {
   Matcher fMatcher = p.matcher(file.getName());
   if (fMatcher.matches()) {
    ArrayList list = new ArrayList();
    list.add(file);
    return list;
   }
  } else if (file.isDirectory()) {
   File[] files = file.listFiles();
   if (files != null && files.length > 0) {
    ArrayList list = new ArrayList();
    for (int i = 0; i < files.length; i++) {
     ArrayList rlist = filePattern(files[i], p);
     if (rlist != null) {
      list.addAll(rlist);
     }
    }
    return list;
   }
  }
  return null;
 }

 @SuppressWarnings("unchecked")
 private static String getFilePath() {
  ResultSet rs = null;
  Connection con = null;
  String sql = "select top 1 key_value from TBL_SYSTEM_CONFIG where key_name='Jour_Picture'";

  String contextPath = System.getProperty("user.dir");
  InputStream inputStream = null;
  try {
   inputStream = new BufferedInputStream(new FileInputStream(
     contextPath + "/databaseConnection.properties"));
   // inputStream = new BufferedInputStream(new FileInputStream(contextPath+"/bin/com/th/deletePic/resource/databaseConnection.properties"));
  } catch (FileNotFoundException e2) {
   JOptionPane.showMessageDialog(null, "配置文件读取失败!", "错误提示", JOptionPane.ERROR_MESSAGE);
  }
  Properties p = new Properties();
  String connectionUrl = "";
  try {
   p.load(inputStream);
   connectionUrl += p.getProperty("url") + ";database="
      + p.getProperty("database") + ";user="
      + p.getProperty("username") + ";password="
      + p.getProperty("password") + ";";
  } catch (IOException e1) {
   e1.printStackTrace();
  }
  String str = "";
  try {
   Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver");
   con = DriverManager.getConnection(connectionUrl);
   rs = con.prepareStatement(sql).executeQuery();

   while (rs.next()) {
    str = rs.getString(1);
   }
  } catch (SQLException e) {
   JOptionPane.showMessageDialog(null, "数据库连接异常!", "错误提示", JOptionPane.ERROR_MESSAGE);
  } catch (ClassNotFoundException e) {
   JOptionPane.showMessageDialog(null, "系统异常，请联系系统员", "错误提示", JOptionPane.ERROR_MESSAGE);
  } finally {
   if (rs != null) {
    try {
     rs.close();
    } catch (SQLException e) {
     e.printStackTrace();
    }
   }
   if (con != null) {
    try {
     con.close();
    } catch (SQLException e) {
     e.printStackTrace();
    }
   }
  }
  return str;
 }

 public static void main(String[] args) {

  String filePath = DeletePic.getFilePath();
  String month = Calendar.getInstance().get(Calendar.MONTH) + "";
  if (month.length() < 2) {
   month = "0" + month;
  }
  String filename = Calendar.getInstance().get(Calendar.YEAR) + ""
    + month + "*.jpg";
  File[] files = DeletePic.getFiles(filePath, filename);
  if (files != null) {
   for (File f : files) {
    File delFile = new File(filePath + "/" + f.getName());
    delFile.delete();
   }
  }

 }
}