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());
	}
	
}