java 常用工具类 (值得收藏)

package org.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.util.Random;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

/**
 * 说明：常用工具
 * 作者：FH Admin
 * from：fhadmin.cn
 */
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)
    }

    /**
     * 随机生成四位数验证码
     * @return
     */
    public static int getRandomNum4(){
         Random r = new Random();
         return r.nextInt(9000)+1000;
    }

    /**
     * 随机生成两位数验证码
     * @return
     */
    public static int getRandomNum2(){
         Random r = new Random();
         return r.nextInt(90)+10;
    }

    /**
     * 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*");
    }

    /**
     * 往文件里的内容
     * @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.replaceAll("file:/", "");
        filePath = filePath.replaceAll("%20", " ");
        filePath = filePath.trim() + fileP.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();
        }
    }

    /**
     * 往文件里的内容（Projectpath下）
     * @param filePath  文件路径
     * @param content  写入的内容
     */
    public static void writeFileCR(String fileP,String content){
        String filePath = PathUtil.getProjectpath() + fileP;
        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里的全部内容
     * @param fileP  文件路径
     * @param encoding  编码
     * @return
     */
    public static String readTxtFileAll(String fileP, String encoding) {
        StringBuffer fileContent = new StringBuffer();
        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;
            }
            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) {
                    fileContent.append(lineTxt);
                    fileContent.append("\n");
                }
                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 fileContent.toString();
    }

    /**
     * 读取Projectpath某文件里的全部内容
     * @param filePath  文件路径
     */
    public static String readFileAllContent(String fileP) {
        StringBuffer fileContent = new StringBuffer();
        try {
            String encoding = "utf-8";
            File file = new File(PathUtil.getProjectpath() + fileP);//文件路径
            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) {
                    fileContent.append(lineTxt);
                    fileContent.append("\n");
                }
                read.close();
            }else{
                System.out.println("找不到指定的文件,查看此路径是否正确:"+fileP);
            }
        } catch (Exception e) {
            System.out.println("读取文件内容出错");
        }
        return fileContent.toString();
    }

    public static void main(String[] args) {
        System.out.println(getRandomNum());
    }

}