java实用工具（字符串）

package com.omg.web.util;

import java.beans.PropertyDescriptor;
import java.text.DecimalFormat;
import java.util.ArrayList;
import java.util.List;
import java.util.Random;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

import org.apache.commons.lang.StringUtils;



public class StringUtil {

// 数字正则
private static final Pattern RE_NUMBER = Pattern.compile("[0-9]+");
// 字符正则
private static final Pattern RE_CHARACTER = Pattern.compile("\\w+");

private static final Pattern Html_TAG = Pattern.compile("<style.*?</style>|<script.*?</script>|<([^>]*)>");
// 千分位显示
private static final DecimalFormat THOUSANDS_TAG = new DecimalFormat("#,###");

public static String join(String[] strs, String s) {

if (null == strs)
return "";

StringBuilder sb = new StringBuilder();

for (int i = 0; i < strs.length; i++) {
sb.append(strs[i]);
if (i != strs.length - 1)
sb.append(s);
}

return sb.toString();
}

public static String[] split(String str, char separatorChar) {

return StringUtils.split(str, separatorChar);

}

public static List<String> splitToList(String str, char separatorChar) {//
if (StringUtil.isBlank(str)) {
return null;
}
List<String> list = new ArrayList<String>();
for (String s : StringUtil.split(str, separatorChar)) {
list.add(s);
}
return list;
}

public static boolean isBlank(String str) {
if (null == str)
return true;
if ("".equals(str.replaceAll("　"," ").trim()))
return true;
return false;
}

public static String toRandom(int j) {

StringBuilder s = new StringBuilder();

for (int i = 0; i < j; i++) {
Random r = new Random();
int n = r.nextInt(3);
if (n == 0) {
s.append(r.nextInt(9));
} else if (n == 1) {
s.append((char) ('a' + Math.random() * 26));
} else {
s.append((char) ('A' + Math.random() * 26));
}
}

return s.toString();
}

private static char[] numbersAndLetters = ("0123456789abcdefghijklmnopqrstuvwxyz" +
            "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ").toCharArray();

public static String randomString(int length) {
        if (length < 1) {
            return null;
        }
        // Create a char buffer to put random letters and numbers in.
        char[] randBuffer = new char[length];
        for (int i = 0; i < randBuffer.length; i++) {
            randBuffer[i] = numbersAndLetters[new Random().nextInt(71)];
        }
        return new String(randBuffer);
    }

public static boolean isMailAddr(String mailAddr) {

String check = "^[_A-Za-z0-9-]+(\\.[_A-Za-z0-9-]+)*@[A-Za-z0-9]+(\\.[A-Za-z0-9-]+)*(\\.[A-Za-z]{2,})$";
Pattern regex = Pattern.compile(check);
Matcher matcher = regex.matcher(mailAddr);
return matcher.matches();
}

public static boolean isNumber(String str) {
return (str != null) && RE_NUMBER.matcher(str).matches();
}

public static String getListToString(List<String> list, char separatorChar) {
if (null != list && list.size() > 0) {
StringBuilder sb = new StringBuilder();

for (int i = 0; i < list.size(); i++) {
sb.append(list.get(i));
if (i != list.size() -1) {
sb.append(separatorChar);
}
}
return sb.toString();
}
return null;
}

/**
* 取出html里所有标签和<scritp><style>内容
*
* @param html html内容
* @param replace 替换内容
* @return
*/
public static String getHtmlToText(String html, String replace) {
Matcher m = Html_TAG.matcher(html);
return m.replaceAll(replace);
}

/**
* 判断是否只字符
*
* @param s
* @return
*/
public static boolean regularCharacter(String s) {
return RE_CHARACTER.matcher(s).matches();
}

/**
* 解析bean对象属性
*
* @param p
* @return
*/
public static String getDisplayName(PropertyDescriptor p) {
if (null != p && null != p.getReadMethod()) {
if (p.getPropertyType() == boolean.class) {
return p.getReadMethod().getName().substring(2);
}
return p.getReadMethod().getName().substring(3);
}
return "";
}

/**
* 获取千分位
*
* @param s
* @return ##,###.00
*/
public static String getThousands(String s) {
try {
return THOUSANDS_TAG.format(Double.valueOf(s));
} catch (Exception e) {
return "";
}
}

public static void main(String[] args) {
System.out.println(StringUtil.getThousands("2500000.000"));
}
}