Java中常用的String的工具类

今天又用了将近一个下午的时间将Java中String类以及常用的一些操作进行归类，写下了如下的一个工具类如下。关于各个方法的注释一个很清楚了这里就不在解释了！

package cn.zzu.wgp;

import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class WgpStringUtils {
    private static Pattern numericPattern = Pattern.compile("^[0-9\\-]+$");// 判断是否为数字

    /**
     * 字符串为 null或"" 时返回true
     *
     * @param string
     * @return
     */
    public static boolean isNull(String string) {
        return string == null || string.trim().equals("") || string.trim().equalsIgnoreCase("null");
    }

    /**
     * 字符串不为空时返回true
     * 
     * @param string
     * @return
     */
    public static boolean notNull(String string) {
        return !isNull(string);
    }

    /**
     * 分割字符，从开始到第一个split字符串为止
     * 
     * @param src
     *            源字符串
     * @param split
     *            截止字符串
     * @return
     */
    public static String subStr(String src, String split) {
        if (!isNull(src)) {
            int index = src.indexOf(split);
            if (index >= 0) {
                return src.substring(0, index);
            }
        }
        return src;
    }

    /**
     * 通过规格切割一个字符返回一个字符数组
     * 
     * @param src
     *            要切割的字符
     * @param split
     *            分割的规则
     * @return
     */
    public static String[] subStrArray(String src, String split) {
        String[] str = null;
        if (!isNull(src)) {
            str = src.split(split);
        }
        return str;
    }

    /**
     * 去除页面的非法字符检查
     * 
     * @author shazao
     * @param str
     * @return
     */
    public static String replaceStr(String str) {
        if (str != null && str.length() > 0) {
            str = str.replaceAll("~", ",");
            str = str.replaceAll(" ", ",");
            str = str.replaceAll("　", ",");
            str = str.replaceAll(" ", ",");
            str = str.replaceAll("`", ",");
            str = str.replaceAll("!", ",");
            str = str.replaceAll("@", ",");
            str = str.replaceAll("#", ",");
            str = str.replaceAll("\\$", ",");
            str = str.replaceAll("%", ",");
            str = str.replaceAll("\\^", ",");
            str = str.replaceAll("&", ",");
            str = str.replaceAll("\\*", ",");
            str = str.replaceAll("\\(", ",");
            str = str.replaceAll("\\)", ",");
            str = str.replaceAll("-", ",");
            str = str.replaceAll("_", ",");
            str = str.replaceAll("=", ",");
            str = str.replaceAll("\\+", ",");
            str = str.replaceAll("\\{", ",");
            str = str.replaceAll("\\[", ",");
            str = str.replaceAll("\\}", ",");
            str = str.replaceAll("\\]", ",");
            str = str.replaceAll("\\|", ",");
            str = str.replaceAll("\\\\", ",");
            str = str.replaceAll(";", ",");
            str = str.replaceAll(":", ",");
            str = str.replaceAll("'", ",");
            str = str.replaceAll("\\\"", ",");
            str = str.replaceAll("<", ",");
            str = str.replaceAll(">", ",");
            str = str.replaceAll("\\.", ",");
            str = str.replaceAll("\\?", ",");
            str = str.replaceAll("/", ",");
            str = str.replaceAll("～", ",");
            str = str.replaceAll("`", ",");
            str = str.replaceAll("！", ",");
            str = str.replaceAll("＠", ",");
            str = str.replaceAll("＃", ",");
            str = str.replaceAll("＄", ",");
            str = str.replaceAll("％", ",");
            str = str.replaceAll("︿", ",");
            str = str.replaceAll("＆", ",");
            str = str.replaceAll("×", ",");
            str = str.replaceAll("（", ",");
            str = str.replaceAll("）", ",");
            str = str.replaceAll("－", ",");
            str = str.replaceAll("＿", ",");
            str = str.replaceAll("＋", ",");
            str = str.replaceAll("＝", ",");
            str = str.replaceAll("｛", ",");
            str = str.replaceAll("［", ",");
            str = str.replaceAll("｝", ",");
            str = str.replaceAll("］", ",");
            str = str.replaceAll("｜", ",");
            str = str.replaceAll("＼", ",");
            str = str.replaceAll("：", ",");
            str = str.replaceAll("；", ",");
            str = str.replaceAll("＂", ",");
            str = str.replaceAll("＇", ",");
            str = str.replaceAll("＜", ",");
            str = str.replaceAll("，", ",");
            str = str.replaceAll("＞", ",");
            str = str.replaceAll("．", ",");
            str = str.replaceAll("？", ",");
            str = str.replaceAll("／", ",");
            str = str.replaceAll("·", ",");
            str = str.replaceAll("￥", ",");
            str = str.replaceAll("……", ",");
            str = str.replaceAll("（", ",");
            str = str.replaceAll("）", ",");
            str = str.replaceAll("——", ",");
            str = str.replaceAll("-", ",");
            str = str.replaceAll("【", ",");
            str = str.replaceAll("】", ",");
            str = str.replaceAll("、", ",");
            str = str.replaceAll("”", ",");
            str = str.replaceAll("’", ",");
            str = str.replaceAll("《", ",");
            str = str.replaceAll("》", ",");
            str = str.replaceAll("“", ",");
            str = str.replaceAll("。", ",");
        }
        return str;
    }

    /**
     * 移除html标签
     * 
     * @param htmlstr
     * @return
     */
    public static String removeHtmlTag(String htmlstr) {
        Pattern pat = Pattern.compile("\\s*<.*?>\\s*", Pattern.DOTALL | Pattern.MULTILINE | Pattern.CASE_INSENSITIVE); // \\s?[s|Sc|Cr|Ri|Ip|Pt|T]
        Matcher m = pat.matcher(htmlstr);
        String rs = m.replaceAll("");
        rs = rs.replaceAll("&nbsp", " ");
        rs = rs.replaceAll("&lt;", "<");
        rs = rs.replaceAll("&gt;", ">");
        return rs;
    }

    /*
     * 判断两个字符串是否相等 如果等为null 则判断相等，一个为null另一个not null则判断不相等 否则如果s1=s2则相等
     * 
     * @param s1
     * 
     * @param s2
     */
    public static boolean equals(String s1, String s2) {
        if (isNull(s1) && isNull(s2)) {
            return true;
        } else if (!isNull(s1) && !isNull(s2)) {
            return s1.equals(s2);
        }
        return false;
    }

    /**
     * 判断一个字符串是否为数字
     * 
     * @param src
     * @return
     */
    public static boolean isNumeric(String src) {
        boolean return_value = false;
        if (src != null && src.length() > 0) {
            Matcher m = numericPattern.matcher(src);
            if (m.find()) {
                return_value = true;
            }
        }
        return return_value;
    }

    /**
     * 检查字符串是否属于手机号
     * 
     * @param phone
     * @return
     */
    public static boolean isMobile(String phone) {
        if (isNull(phone))
            return false;
        if (phone.trim().length() != 11 || !isNumeric(phone))
            return false;
        if (!phone.trim().substring(0, 2).equals("13") && !phone.trim().substring(0, 2).equals("15")
                && !phone.trim().substring(0, 2).equals("18"))
            return false;
        return true;
    }

    // public static String random(int bit) {
    // if (bit == 0)
    // bit = 6;
    // String str = "";
    // str = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijkmnpqrstuvwxyz";//
    // 初始化种子
    //// return RandomStringUtils.random(bit, str);// 返回6位的字符串
    // }
    /**
     * 把字符串转换为html代码
     *
     * @param str
     * @return
     */
    public static String replaceHtml(String str) {
        try {
            str = str.trim();
            str = str.replaceAll("&", "&amp;");
            str = str.replaceAll("<", "&lt;");
            str = str.replaceAll(">", "&gt;");
            str = str.replaceAll(" ", "&nbsp;");
            str = str.replace("'", "&#39;");
            str = str.replaceAll("\"", "&quot;");
            str = str.replace("\r\n", "<br />");
            str = str.replace("\n", "<br />");
            str = str.replace("\r", "<br />");
            return str;
        } catch (NullPointerException e) {
            return null;
        }
    }

    /**
     * 转换NULL为""
     * @param sou
     * @return
     */
    public static String changeNull(String sou) {
        return sou == null || sou.equals("null") ? "" : sou;
    }
}