Java 常用工具类

package com.fh.util;import java.io.BufferedReader;import java.io.BufferedWriter;import java.io.File;import java.io.FileInputStream;import java.io.FileOutputStream;import java.io.IOException;import java.io.InputStreamReader;import java.io.OutputStreamWriter;import java.text.ParseException;import java.text.SimpleDateFormat;import java.util.Date;import java.util.Random;import java.util.regex.Matcher;import java.util.regex.Pattern;/**  * 说明：常用工具 * 修改时间：2015年11月24日 * @version */public class Tools {/*** 随机生成六位数验证码 * @return*/public static int getRandomNum(){Random r = new Random();return r.nextInt(900000)+100000;//(Math.random()*(999999-100000)+100000)}/*** 检测字符串是否不为空(null,"","null")* @param s* @return 不为空则返回true，否则返回false*/public static boolean notEmpty(String s){return s!=null && !"".equals(s) && !"null".equals(s);}/*** 检测字符串是否为空(null,"","null")* @param s* @return 为空则返回true，不否则返回false*/public static boolean isEmpty(String s){return s==null || "".equals(s) || "null".equals(s);}/*** 字符串转换为字符串数组* @param str 字符串* @param splitRegex 分隔符* @return*/public static String[] str2StrArray(String str,String splitRegex){if(isEmpty(str)){return null;}return str.split(splitRegex);}/*** 用默认的分隔符(,)将字符串转换为字符串数组* @param str 字符串* @return*/public static String[] str2StrArray(String str){return str2StrArray(str,",\\s*");}/*** 按照yyyy-MM-dd HH:mm:ss的格式，日期转字符串* @param date* @return yyyy-MM-dd HH:mm:ss*/public static String date2Str(Date date){return date2Str(date,"yyyy-MM-dd HH:mm:ss");}/*** 按照yyyy-MM-dd HH:mm:ss的格式，字符串转日期* @param date* @return*/public static Date str2Date(String date){if(notEmpty(date)){SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");try {return sdf.parse(date);} catch (ParseException e) {e.printStackTrace();}return new Date();}else{return null;}}/*** 按照参数format的格式，日期转字符串* @param date* @param format* @return*/public static String date2Str(Date date,String format){if(date!=null){SimpleDateFormat sdf = new SimpleDateFormat(format);return sdf.format(date);}else{return "";}}/*** 把时间根据时、分、秒转换为时间段* @param StrDate*/public static String getTimes(String StrDate){String resultTimes = "";SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");   java.util.Date now;      try {    now = new Date();    java.util.Date date=df.parse(StrDate);    long times = now.getTime()-date.getTime();    long day  =  times/(24*60*60*1000);    long hour = (times/(60*60*1000)-day*24);    long min  = ((times/(60*1000))-day*24*60-hour*60);    long sec  = (times/1000-day*24*60*60-hour*60*60-min*60);           StringBuffer sb = new StringBuffer();    //sb.append("发表于：");    if(hour>0 ){    sb.append(hour+"小时前");    } else if(min>0){    sb.append(min+"分钟前");    } else{    sb.append(sec+"秒前");    }        resultTimes = sb.toString();   } catch (ParseException e) {    e.printStackTrace();   }      return resultTimes;}/*** 写txt里的单行内容* @param filePath  文件路径* @param content  写入的内容*/public static void writeFile(String fileP,String content){String filePath = String.valueOf(Thread.currentThread().getContextClassLoader().getResource(""))+"../../";//项目路径filePath = (filePath.trim() + fileP.trim()).substring(6).trim();if(filePath.indexOf(":") != 1){filePath = File.separator + filePath;}try {       OutputStreamWriter write = new OutputStreamWriter(new FileOutputStream(filePath),"utf-8");             BufferedWriter writer=new BufferedWriter(write);                 writer.write(content);             writer.close();        } catch (IOException e) {e.printStackTrace();}}/** * 验证邮箱 * @param email * @return */public static boolean checkEmail(String email){ boolean flag = false; try{   String check = "^([a-z0-9A-Z]+[-|_|\\.]?)+[a-z0-9A-Z]@([a-z0-9A-Z]+(-[a-z0-9A-Z]+)?\\.)+[a-zA-Z]{2,}$";   Pattern regex = Pattern.compile(check);   Matcher matcher = regex.matcher(email);   flag = matcher.matches();  }catch(Exception e){   flag = false;  } return flag;}/** * 验证手机号码 * @param mobiles * @return */public static boolean checkMobileNumber(String mobileNumber){ boolean flag = false; try{   Pattern regex = Pattern.compile("^(((13[0-9])|(15([0-3]|[5-9]))|(18[0,5-9]))\\d{8})|(0\\d{2}-\\d{8})|(0\\d{3}-\\d{7})$");   Matcher matcher = regex.matcher(mobileNumber);   flag = matcher.matches();  }catch(Exception e){   flag = false;  } return flag;} /*** 检测KEY是否正确* @param paraname  传入参数* @param FKEY 接收的 KEY* @return 为空则返回true，不否则返回false*/public static boolean checkKey(String paraname, String FKEY){paraname = (null == paraname)? "":paraname;return MD5.md5(paraname+DateUtil.getDays()+",fh,").equals(FKEY);} /*** 读取txt里的单行内容* @param filePath  文件路径*/public static String readTxtFile(String fileP) {try {String filePath = String.valueOf(Thread.currentThread().getContextClassLoader().getResource(""))+"../../";//项目路径filePath = filePath.replaceAll("file:/", "");filePath = filePath.replaceAll("%20", " ");filePath = filePath.trim() + fileP.trim();if(filePath.indexOf(":") != 1){filePath = File.separator + filePath;}String encoding = "utf-8";File file = new File(filePath);if (file.isFile() && file.exists()) { // 判断文件是否存在InputStreamReader read = new InputStreamReader(new FileInputStream(file), encoding);// 考虑到编码格式BufferedReader bufferedReader = new BufferedReader(read);String lineTxt = null;while ((lineTxt = bufferedReader.readLine()) != null) {return lineTxt;}read.close();}else{System.out.println("找不到指定的文件,查看此路径是否正确:"+filePath);}} catch (Exception e) {System.out.println("读取文件内容出错");}return "";}public static void main(String[] args) {System.out.println(getRandomNum());}}