java 常用工具类 (值得收藏) _常用

高斋晓开卷，独共圣人语。这篇文章主要讲述java 常用工具类 (值得收藏)相关的知识，希望能为你提供帮助。

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]))\\\\d8)|(0\\\\d2-\\\\d8)|(0\\\\d3-\\\\d7)$");
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());