编写属于自己的公用Util类

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package com.ces.config.utils;import java.util.Collection;import java.util.Iterator;import java.util.Random;public class StringUtil {        private static final String ZERO_10 = "0000000000";    /** 空字符串.*/    public static final String EMPTY = "";    /** 零字符串.*/    public static final String ZERO  = "0";    /**     * <p>标题: isEmpty</p>     * <p>描述: 判断是否为空字符串</p>     * @param  obj     * @return boolean    返回类型        * @throws     */    public static boolean isEmpty(Object obj) {        if (EMPTY.equals(null2empty(obj).trim())) return true;        return false;    }        /**     * <p>标题: isNotEmpty</p>     * <p>描述: 判断是否为非空字符串</p>     * @param  obj     * @return boolean    返回类型        * @throws     */    public static boolean isNotEmpty(Object obj) {        return !isEmpty(obj);    }        /**     * <p>标题: null2empty</p>     * <p>描述: 处理null对象，返回空口串""</p>     * @param  obj     * @return String    返回类型        * @throws     */    public static String null2empty(Object obj) {        if (null == obj || "null".equals(String.valueOf(obj))) {            return EMPTY;        }        return String.valueOf(obj);    }        /**     * qiucs 2013-8-15      * <p>标题: null2zero</p>     * <p>描述: 数字（如果null或不是数字时，则返回0）</p>     * @param  obj     * @return String    返回类型        * @throws     */    public static String null2zero(Object obj) {        String str = null2empty(obj).trim();        if (str.matches("^(-?[0-9]+(\\.[0-9]+)?)$")) {            return str;        }        return ZERO;            }        /**     * XXXX 2015-12-08      * <p>标题: getContent</p>     * <p>描述: 获取数据库值（如果null返回null，否则返回加引号的string内容）</p>     * @param  obj     * @return String    返回类型        * @throws     */    public static String getContent(Object obj) {    if (null == obj || "null".equals(String.valueOf(obj))) {            return null;        } else {        return "'" + String.valueOf(obj) + "'";        }       }        /**     * XXXX 2013-8-12      * <p>标题: fillZero</p>     * <p>描述: </p>     * @param  len     *         指定长度     * @param  obj     *         补零对象     * @return String    返回类型        *         返回补零后字符串     * @throws     */    public static String fillZero(int len, Object obj) {        int lenOfObj = null2empty(obj).length();        if (lenOfObj >= len) {            return null2empty(obj);        }        int fillLen = (len - lenOfObj);        String zeroStr = EMPTY;        for (int i = 0; i < (fillLen/10); i++) {            zeroStr += ZERO_10;        }        zeroStr += ZERO_10.substring(0, fillLen%10);        return zeroStr.concat(null2empty(obj));    }        /**     * 验证给定字符串是否为真.     * <p>描述:true、1或on均表示为真</p>     * @param value 要验证的字符串     * @return 当<code>value</code>的值为true、1或on返回真，否则返回假     */    public static boolean isBooleanTrue(String value) {        if (value != null && !EMPTY.equals(value.trim())) {            return "true".equalsIgnoreCase(value.trim()) || "1".equals(value.trim()) || "on".equalsIgnoreCase(value.trim());        }                return false;    }        /**     * XXXX 2015-8-6 下午2:49:06     * <p>描述: HTML标签处理 </p>     * @return String     */    public static String processHtmlTag(Object val) {    String str = null2empty(val);    if (EMPTY.equals(str)) return EMPTY;    if (str.contains("<")) str = str.replace("<", "<");    if (str.contains(">")) str = str.replace(">", ">");    return str;    }        /**     * qiucs 2016-5-27 上午9:10:51     * <p>描述: 连接 </p>     * @return String     */    public static String join(String[] strArr, String seperator) {    if (null == strArr) return null;        StringBuilder sb = new StringBuilder();        for (String str : strArr) {sb.append(seperator).append(str);}    if (sb.length() > 0) sb.delete(0, seperator.length());    return sb.toString();    }        /**     * XXXX 2015-3-4 下午8:58:51     * <p>描述: 连接 </p>     * @return String     */    public static String join(Collection<String> collection, String seperator) {    if (null == collection) return null;        StringBuilder sb = new StringBuilder();        Iterator<String> it = collection.iterator();        while (it.hasNext()) {String str = (String) it.next();sb.append(seperator).append(str);}    if (sb.length() > 0) sb.delete(0, seperator.length());    return sb.toString();    }        /**     * XXXX 2016-5-27 上午9:23:10     * <p>描述: 按逗号连接 </p>     * @return String     */    public static String join(String[] strArr) {    return join(strArr, ",");    }        /**     * XXXX 2015-3-4 下午8:59:10     * <p>描述: 按逗号连接 </p>     * @return String     */    public static String join(Collection<String> collection) {    return join(collection, ",");    }    /**     * xxxx 2015-3-5 上午9:37:35     * <p>描述: 转换为驼峰命名格式 </p>     * @return String     */    public static String toCamelCase(String name) {    return toCamelCase(name, "_");    }    /**     * xxxx 2015-3-5 上午9:37:35     * <p>描述: 转换为驼峰命名格式 </p>     * @return String     */    public static String toCamelCase(String name, String seperator) {    if (isEmpty(name)) return EMPTY;    name = name.toLowerCase();    String[] items = name.split(seperator);    int i = 0, len = items.length;    StringBuilder sb = new StringBuilder();    StringBuilder it = null;    sb.append(items[0]);        for (i = 1; i < len; i++) {    it = new StringBuilder(items[i]);    it.setCharAt(0, Character.toUpperCase(it.charAt(0)));    sb.append(it);    }        return sb.toString();    }        /**     * xxxx 2015-7-8 上午11:27:47     * <p>描述: 字符与数字混合随机字符串 </p>     * @return String     */    public static String mixRandom(int len) {    StringBuilder sb = new StringBuilder(len);    Random rd = new Random();    if (len > 0) sb.append(chArr[rd.nextInt(26)]);    for (int i = 1; i < len; i++) {    sb.append(chArr[rd.nextInt(36)]);    }        return sb.toString();    }    /**     * xxxx 2015-7-8 上午11:27:47     * <p>描述: 字符随机字符串 </p>     * @return String     */    public static String charRandom(int len) {    StringBuilder sb = new StringBuilder(len);    Random rd = new Random();    for (int i = 0; i < len; i++) {    sb.append(chArr[rd.nextInt(26)]);    }        return sb.toString();    }        /**     * xxx 2015-7-8 上午11:27:47     * <p>描述: 数字混合随机字符串 </p>     * @return String     */    public static String numRandom(int len) {    StringBuilder sb = new StringBuilder(len);    Random rd = new Random();    for (int i = 0; i < len; i++) {    sb.append(chArr[26 + rd.nextInt(10)]);    }        return sb.toString();    }        /**     * XXXX 2015-11-17     * <p>描述: 字符串中中文转unicode </p>     * @return String     */    public static String string2Unicode(String string) {        StringBuffer unicode = new StringBuffer();        for (int i = 0; i < string.length(); i++) {            char c = string.charAt(i);            if ((c >= 0x4e00)&&(c <= 0x9fbb)) {            unicode.append("\\u" + Integer.toHexString(c));} else {unicode.append(c);}        }                return unicode.toString();    }        /**     * XXXX 2016-4-8 下午5:12:47     * <p>描述: 获取换行符 </p>     * @return String     */    public static String getEnterSymbol() {    if (OSUtil.isWindows()) {    return "\r\n";    } else if (OSUtil.isLinux() || OSUtil.isUnix()) {    return "\n";    } else if (OSUtil.isMacOS()) {    return "\r";    }    return System.getProperty("line.separator");    }        private static final char[] chArr = {'Q', 'W', 'E', 'R', 'T', 'Y', 'U', 'I', 'O', 'P',     'A', 'S', 'D', 'F', 'G', 'H', 'J', 'K', 'L',     'Z', 'X', 'C', 'V', 'B', 'N', 'M',     '1', '2', '3', '4', '5', '6', '7', '8', '9', '0'};}
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