java常用工具类 | 目的地Destination

java常用工具类

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package cn.hc.util;
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import java.io.BufferedReader;
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import java.io.BufferedWriter;
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import java.io.File;
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import java.io.FileInputStream;
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import java.io.FileOutputStream;
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import java.io.IOException;
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import java.io.InputStreamReader;
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import java.io.OutputStreamWriter;
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import java.text.ParseException;
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import java.text.SimpleDateFormat;
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import java.util.Date;
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import java.util.Random;
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import java.util.regex.Matcher;
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import java.util.regex.Pattern;

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;
}

/**
* 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());
}

}

java常用工具类:等您坐沙发呢!

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