废话不多说，直接上代码。
验证类Validator
主要是空验证、数字、格式验证
调用的例子：
protected void validateEmailFrom(ActionRequest actionRequest){String emailFromName = getParameter(actionRequest, "emailFromName");String emailFromAddress = getParameter(actionRequest, "emailFromAddress");if (Validator.isNull(emailFromName)) {SessionErrors.add(actionRequest, "emailFromName");}else if (!Validator.isEmailAddress(emailFromAddress) &&!Validator.isVariableTerm(emailFromAddress)) {SessionErrors.add(actionRequest, "emailFromAddress");} }
数组工具类，ArrayUtil
主要的操作是：
源代码实现分析1、去除重复值，如
public static String[] distinct(String[] array) {return distinct(array, null);}public static String[] distinct(String[] array, Comparator<String> comparator) {if ((array == null) || (array.length == 0)) {return array;}Set<String> set = null;if (comparator == null) {set = new TreeSet<String>();}else {set = new TreeSet<String>(comparator);}for (int i = 0; i < array.length; i++) {String s = array[i];if (!set.contains(s)) {set.add(s);}}return set.toArray(new String[set.size()]);}
源代码实现分析2、尾部增加项，比如：
public static Float[] append(Float[] array, Float obj) {Float[] newArray = new Float[array.length + 1];System.arraycopy(array, 0, newArray, 0, array.length);newArray[newArray.length - 1] = obj;return newArray; }
3、JSONArray、Object和Array转换，如：
static String[] toStringArray(JSONArray array) static String[] toStringArray(Object[] array)
字符串工具StringUtil
一个例子，用于字符替换，同时也使用了StringPool
protected Map<String, String> getJSONValues(JSONArray data, String namespace, String id) {Map<String, String> values = new HashMap<String, String>(data.length());for (int i = 0; i < data.length(); i++) {JSONObject jsonObject = data.getJSONObject(i);String name = jsonObject.getString("name"); name = StringUtil.replace( name, new String[] {namespace, id}, new String[] {StringPool.BLANK, StringPool.BLANK}); values.put(name, jsonObject.getString("value")); } return values; }
StringUtil源代码，有兴趣可以研究
package com.liferay.portal.kernel.util;import com.liferay.portal.kernel.log.Log; import com.liferay.portal.kernel.log.LogFactoryUtil;import java.io.BufferedReader; import java.io.IOException; import java.io.InputStream; import java.io.InputStreamReader; import java.io.StringReader;import java.net.URL;import java.util.ArrayList; import java.util.Collection; import java.util.Enumeration; import java.util.List; import java.util.Map; import java.util.StringTokenizer;public class StringUtil {public static String add(String s, String add) {return add(s, add, StringPool.COMMA);}public static String add(String s, String add, String delimiter) {return add(s, add, delimiter, false);}public static String add(String s, String add, String delimiter, boolean allowDuplicates) {if ((add == null) || (delimiter == null)) {return null;}if (s == null) {s = StringPool.BLANK;}if (allowDuplicates || !contains(s, add, delimiter)) {StringBuilder sb = new StringBuilder();sb.append(s);if (Validator.isNull(s) || s.endsWith(delimiter)) {sb.append(add);sb.append(delimiter);}else {sb.append(delimiter);sb.append(add);sb.append(delimiter);}s = sb.toString();}return s;}public static String bytesToHexString(byte[] bytes) {StringBuilder sb = new StringBuilder(bytes.length * 2);for (int i = 0; i < bytes.length; i++) {String hex = Integer.toHexString(0x0100 + (bytes[i] & 0x00FF)).substring(1);if (hex.length() < 2) {sb.append("0");}sb.append(hex);}return sb.toString();}public static boolean contains(String s, String text) {return contains(s, text, StringPool.COMMA);}public static boolean contains(String s, String text, String delimiter) {if ((s == null) || (text == null) || (delimiter == null)) {return false;}StringBuilder sb = null;if (!s.endsWith(delimiter)) {sb = new StringBuilder();sb.append(s);sb.append(delimiter);s = sb.toString();}sb = new StringBuilder();sb.append(delimiter);sb.append(text);sb.append(delimiter);String dtd = sb.toString();int pos = s.indexOf(dtd);if (pos == -1) {sb = new StringBuilder();sb.append(text);sb.append(delimiter);String td = sb.toString();if (s.startsWith(td)) {return true;}return false;}return true;}public static int count(String s, String text) {if ((s == null) || (text == null)) {return 0;}int count = 0;int pos = s.indexOf(text);while (pos != -1) {pos = s.indexOf(text, pos + text.length());count++;}return count;}public static boolean endsWith(String s, char end) {return endsWith(s, (new Character(end)).toString());}public static boolean endsWith(String s, String end) {if ((s == null) || (end == null)) {return false;}if (end.length() > s.length()) {return false;}String temp = s.substring(s.length() - end.length(), s.length());if (temp.equalsIgnoreCase(end)) {return true;}else {return false;}}public static String extractChars(String s) {if (s == null) {return StringPool.BLANK;}StringBuilder sb = new StringBuilder();char[] c = s.toCharArray();for (int i = 0; i < c.length; i++) {if (Validator.isChar(c[i])) {sb.append(c[i]);}}return sb.toString();}public static String extractDigits(String s) {if (s == null) {return StringPool.BLANK;}StringBuilder sb = new StringBuilder();char[] c = s.toCharArray();for (int i = 0; i < c.length; i++) {if (Validator.isDigit(c[i])) {sb.append(c[i]);}}return sb.toString();}public static String extractFirst(String s, String delimiter) {if (s == null) {return null;}else {String[] array = split(s, delimiter);if (array.length > 0) {return array[0];}else {return null;}}}public static String extractLast(String s, String delimiter) {if (s == null) {return null;}else {String[] array = split(s, delimiter);if (array.length > 0) {return array[array.length - 1];}else {return null;}}}public static String highlight(String s, String keywords) {return highlight(s, keywords, "<span class=\"highlight\">", "</span>");}public static String highlight(String s, String keywords, String highlight1, String highlight2) {if (s == null) {return null;}// The problem with using a regexp is that it searches the text in a// case insenstive manner but doens't replace the text in a case// insenstive manner. So the search results actually get messed up. The// best way is to actually parse the results.//return s.replaceAll(// "(?i)" + keywords, highlight1 + keywords + highlight2); StringBuilder sb = new StringBuilder(StringPool.SPACE);StringTokenizer st = new StringTokenizer(s);while (st.hasMoreTokens()) {String token = st.nextToken();if (token.equalsIgnoreCase(keywords)) {sb.append(highlight1);sb.append(token);sb.append(highlight2);}else {sb.append(token);}if (st.hasMoreTokens()) {sb.append(StringPool.SPACE);}}return sb.toString();}public static String lowerCase(String s) {if (s == null) {return null;}else {return s.toLowerCase();}}public static String merge(boolean[] array) {return merge(array, StringPool.COMMA);}public static String merge(boolean[] array, String delimiter) {if (array == null) {return null;}StringBuilder sb = new StringBuilder();for (int i = 0; i < array.length; i++) {sb.append(String.valueOf(array[i]).trim());if ((i + 1) != array.length) {sb.append(delimiter);}}return sb.toString();}public static String merge(double[] array) {return merge(array, StringPool.COMMA);}public static String merge(double[] array, String delimiter) {if (array == null) {return null;}StringBuilder sb = new StringBuilder();for (int i = 0; i < array.length; i++) {sb.append(String.valueOf(array[i]).trim());if ((i + 1) != array.length) {sb.append(delimiter);}}return sb.toString();}public static String merge(float[] array) {return merge(array, StringPool.COMMA);}public static String merge(float[] array, String delimiter) {if (array == null) {return null;}StringBuilder sb = new StringBuilder();for (int i = 0; i < array.length; i++) {sb.append(String.valueOf(array[i]).trim());if ((i + 1) != array.length) {sb.append(delimiter);}}return sb.toString();}public static String merge(int[] array) {return merge(array, StringPool.COMMA);}public static String merge(int[] array, String delimiter) {if (array == null) {return null;}StringBuilder sb = new StringBuilder();for (int i = 0; i < array.length; i++) {sb.append(String.valueOf(array[i]).trim());if ((i + 1) != array.length) {sb.append(delimiter);}}return sb.toString();}public static String merge(long[] array) {return merge(array, StringPool.COMMA);}public static String merge(long[] array, String delimiter) {if (array == null) {return null;}StringBuilder sb = new StringBuilder();for (int i = 0; i < array.length; i++) {sb.append(String.valueOf(array[i]).trim());if ((i + 1) != array.length) {sb.append(delimiter);}}return sb.toString();}public static String merge(short[] array) {return merge(array, StringPool.COMMA);}public static String merge(short[] array, String delimiter) {if (array == null) {return null;}StringBuilder sb = new StringBuilder();for (int i = 0; i < array.length; i++) {sb.append(String.valueOf(array[i]).trim());if ((i + 1) != array.length) {sb.append(delimiter);}}return sb.toString();}public static String merge(Collection<?> col) {return merge(col, StringPool.COMMA);}public static String merge(Collection<?> col, String delimiter) {return merge(col.toArray(new Object[col.size()]), delimiter);}public static String merge(Object[] array) {return merge(array, StringPool.COMMA);}public static String merge(Object[] array, String delimiter) {if (array == null) {return null;}StringBuilder sb = new StringBuilder();for (int i = 0; i < array.length; i++) {sb.append(String.valueOf(array[i]).trim());if ((i + 1) != array.length) {sb.append(delimiter);}}return sb.toString();}public static String randomize(String s) {return Randomizer.getInstance().randomize(s);}public static String read(ClassLoader classLoader, String name)throws IOException {return read(classLoader, name, false);}public static String read(ClassLoader classLoader, String name, boolean all)throws IOException {if (all) {StringBuilder sb = new StringBuilder();Enumeration<URL> enu = classLoader.getResources(name);while (enu.hasMoreElements()) {URL url = enu.nextElement();InputStream is = url.openStream();String s = read(is);if (s != null) {sb.append(s);sb.append(StringPool.NEW_LINE);}is.close();}return sb.toString().trim();}else {InputStream is = classLoader.getResourceAsStream(name);String s = read(is);is.close();return s;}}public static String read(InputStream is) throws IOException {StringBuilder sb = new StringBuilder();BufferedReader br = new BufferedReader(new InputStreamReader(is));String line = null;while ((line = br.readLine()) != null) {sb.append(line).append('\n');}br.close();return sb.toString().trim();}public static String remove(String s, String remove) {return remove(s, remove, StringPool.COMMA);}public static String remove(String s, String remove, String delimiter) {if ((s == null) || (remove == null) || (delimiter == null)) {return null;}if (Validator.isNotNull(s) && !s.endsWith(delimiter)) {s += delimiter;}StringBuilder sb = new StringBuilder();sb.append(delimiter);sb.append(remove);sb.append(delimiter);String drd = sb.toString();sb = new StringBuilder();sb.append(remove);sb.append(delimiter);String rd = sb.toString();while (contains(s, remove, delimiter)) {int pos = s.indexOf(drd);if (pos == -1) {if (s.startsWith(rd)) {int x = remove.length() + delimiter.length();int y = s.length();s = s.substring(x, y);}}else {int x = pos + remove.length() + delimiter.length();int y = s.length();sb = new StringBuilder();sb.append(s.substring(0, pos));sb.append(s.substring(x, y));s = sb.toString();}}return s;}public static String replace(String s, char oldSub, char newSub) {if (s == null) {return null;}return s.replace(oldSub, newSub);}public static String replace(String s, char oldSub, String newSub) {if ((s == null) || (newSub == null)) {return null;}// The number 5 is arbitrary and is used as extra padding to reduce// buffer expansion StringBuilder sb = new StringBuilder(s.length() + 5 * newSub.length());char[] charArray = s.toCharArray();for (char c : charArray) {if (c == oldSub) {sb.append(newSub);}else {sb.append(c);}}return sb.toString();}public static String replace(String s, String oldSub, String newSub) {if ((s == null) || (oldSub == null) || (newSub == null)) {return null;}int y = s.indexOf(oldSub);if (y >= 0) {// The number 5 is arbitrary and is used as extra padding to reduce// buffer expansion StringBuilder sb = new StringBuilder(s.length() + 5 * newSub.length());int length = oldSub.length();int x = 0;while (x <= y) {sb.append(s.substring(x, y));sb.append(newSub);x = y + length;y = s.indexOf(oldSub, x);}sb.append(s.substring(x));return sb.toString();}else {return s;}}public static String replace(String s, String[] oldSubs, String[] newSubs) {if ((s == null) || (oldSubs == null) || (newSubs == null)) {return null;}if (oldSubs.length != newSubs.length) {return s;}for (int i = 0; i < oldSubs.length; i++) {s = replace(s, oldSubs[i], newSubs[i]);}return s;}public static String replace(String s, String[] oldSubs, String[] newSubs, boolean exactMatch) {if ((s == null) || (oldSubs == null) || (newSubs == null)) {return null;}if (oldSubs.length != newSubs.length) {return s;}if (!exactMatch) {replace(s, oldSubs, newSubs);}else {for (int i = 0; i < oldSubs.length; i++) {s = s.replaceAll("\\b" + oldSubs[i] + "\\b" , newSubs[i]);}}return s;}/*** Returns a string with replaced values. This method will replace all text* in the given string, between the beginning and ending delimiter, with new* values found in the given map. For example, if the string contained the* text <code>[$HELLO$]</code>, and the beginning delimiter was* <code>[$]</code>, and the ending delimiter was <code>$]</code>, and the* values map had a key of <code>HELLO</code> that mapped to* <code>WORLD</code>, then the replaced string will contain the text* <code>[$WORLD$]</code>.** @param s the original string* @param begin the beginning delimiter* @param end the ending delimiter* @param values a map of old and new values* @return a string with replaced values*/public static String replaceValues(String s, String begin, String end, Map<String, String> values) {if ((s == null) || (begin == null) || (end == null) ||(values == null) || (values.size() == 0)) {return s;}StringBuilder sb = new StringBuilder(s.length());int pos = 0;while (true) {int x = s.indexOf(begin, pos);int y = s.indexOf(end, x + begin.length());if ((x == -1) || (y == -1)) {sb.append(s.substring(pos, s.length()));break;}else {sb.append(s.substring(pos, x + begin.length()));String oldValue = s.substring(x + begin.length(), y);String newValue = values.get(oldValue);if (newValue == null) {newValue = oldValue;}sb.append(newValue);pos = y;}}return sb.toString();}public static String reverse(String s) {if (s == null) {return null;}char[] c = s.toCharArray();char[] reverse = new char[c.length];for (int i = 0; i < c.length; i++) {reverse[i] = c[c.length - i - 1];}return new String(reverse);}public static String safePath(String path) {return replace(path, StringPool.DOUBLE_SLASH, StringPool.SLASH);}public static String shorten(String s) {return shorten(s, 20);}public static String shorten(String s, int length) {return shorten(s, length, "...");}public static String shorten(String s, String suffix) {return shorten(s, 20, suffix);}public static String shorten(String s, int length, String suffix) {if ((s == null) || (suffix == null)) {return null;}if (s.length() > length) {for (int j = length; j >= 0; j--) {if (Character.isWhitespace(s.charAt(j))) {length = j;break;}}StringBuilder sb = new StringBuilder();sb.append(s.substring(0, length));sb.append(suffix);s = sb.toString();}return s;}public static String[] split(String s) {return split(s, StringPool.COMMA);}public static String[] split(String s, String delimiter) {if (s == null || delimiter == null) {return new String[0];}s = s.trim();if (!s.endsWith(delimiter)) {StringBuilder sb = new StringBuilder();sb.append(s);sb.append(delimiter);s = sb.toString();}if (s.equals(delimiter)) {return new String[0];}List<String> nodeValues = new ArrayList<String>();if (delimiter.equals("\n") || delimiter.equals("\r")) {try {BufferedReader br = new BufferedReader(new StringReader(s));String line = null;while ((line = br.readLine()) != null) {nodeValues.add(line);}br.close();}catch (IOException ioe) {_log.error(ioe.getMessage());}}else {int offset = 0;int pos = s.indexOf(delimiter, offset);while (pos != -1) {nodeValues.add(new String(s.substring(offset, pos)));offset = pos + delimiter.length();pos = s.indexOf(delimiter, offset);}}return nodeValues.toArray(new String[nodeValues.size()]);}public static boolean[] split(String s, boolean x) {return split(s, StringPool.COMMA, x);}public static boolean[] split(String s, String delimiter, boolean x) {String[] array = split(s, delimiter);boolean[] newArray = new boolean[array.length];for (int i = 0; i < array.length; i++) {boolean value = x;try {value = Boolean.valueOf(array[i]).booleanValue();}catch (Exception e) {}newArray[i] = value;}return newArray;}public static double[] split(String s, double x) {return split(s, StringPool.COMMA, x);}public static double[] split(String s, String delimiter, double x) {String[] array = split(s, delimiter);double[] newArray = new double[array.length];for (int i = 0; i < array.length; i++) {double value = x;try {value = Double.parseDouble(array[i]);}catch (Exception e) {}newArray[i] = value;}return newArray;}public static float[] split(String s, float x) {return split(s, StringPool.COMMA, x);}public static float[] split(String s, String delimiter, float x) {String[] array = split(s, delimiter);float[] newArray = new float[array.length];for (int i = 0; i < array.length; i++) {float value = x;try {value = Float.parseFloat(array[i]);}catch (Exception e) {}newArray[i] = value;}return newArray;}public static int[] split(String s, int x) {return split(s, StringPool.COMMA, x);}public static int[] split(String s, String delimiter, int x) {String[] array = split(s, delimiter);int[] newArray = new int[array.length];for (int i = 0; i < array.length; i++) {int value = x;try {value = Integer.parseInt(array[i]);}catch (Exception e) {}newArray[i] = value;}return newArray;}public static long[] split(String s, long x) {return split(s, StringPool.COMMA, x);}public static long[] split(String s, String delimiter, long x) {String[] array = split(s, delimiter);long[] newArray = new long[array.length];for (int i = 0; i < array.length; i++) {long value = x;try {value = Long.parseLong(array[i]);}catch (Exception e) {}newArray[i] = value;}return newArray;}public static short[] split(String s, short x) {return split(s, StringPool.COMMA, x);}public static short[] split(String s, String delimiter, short x) {String[] array = split(s, delimiter);short[] newArray = new short[array.length];for (int i = 0; i < array.length; i++) {short value = x;try {value = Short.parseShort(array[i]);}catch (Exception e) {}newArray[i] = value;}return newArray;}public static boolean startsWith(String s, char begin) {return startsWith(s, (new Character(begin)).toString());}public static boolean startsWith(String s, String start) {if ((s == null) || (start == null)) {return false;}if (start.length() > s.length()) {return false;}String temp = s.substring(0, start.length());if (temp.equalsIgnoreCase(start)) {return true;}else {return false;}}/*** Return the number of starting letters that s1 and s2 have in common* before they deviate.** @param s1 the first string* @param s2 the second string** @return the number of starting letters that s1 and s2 have in common* before they deviate*/public static int startsWithWeight(String s1, String s2) {if ((s1 == null) || (s2 == null)) {return 0;}char[] charArray1 = s1.toCharArray();char[] charArray2 = s2.toCharArray();int i = 0;for (; (i < charArray1.length) && (i < charArray2.length); i++) {if (charArray1[i] != charArray2[i]) {break;}}return i;}public static String stripBetween(String s, String begin, String end) {if ((s == null) || (begin == null) || (end == null)) {return s;}StringBuilder sb = new StringBuilder(s.length());int pos = 0;while (true) {int x = s.indexOf(begin, pos);int y = s.indexOf(end, x + begin.length());if ((x == -1) || (y == -1)) {sb.append(s.substring(pos, s.length()));break;}else {sb.append(s.substring(pos, x));pos = y + end.length();}}return sb.toString();}public static String trim(String s) {return trim(s, null);}public static String trim(String s, char c) {return trim(s, new char[] {c});}public static String trim(String s, char[] exceptions) {if (s == null) {return null;}char[] charArray = s.toCharArray();int len = charArray.length;int x = 0;int y = charArray.length;for (int i = 0; i < len; i++) {char c = charArray[i];if (_isTrimable(c, exceptions)) {x = i + 1;}else {break;}}for (int i = len - 1; i >= 0; i--) {char c = charArray[i];if (_isTrimable(c, exceptions)) {y = i;}else {break;}}if ((x != 0) || (y != len)) {return s.substring(x, y);}else {return s;}}public static String trimLeading(String s) {return trimLeading(s, null);}public static String trimLeading(String s, char c) {return trimLeading(s, new char[] {c});}public static String trimLeading(String s, char[] exceptions) {if (s == null) {return null;}char[] charArray = s.toCharArray();int len = charArray.length;int x = 0;int y = charArray.length;for (int i = 0; i < len; i++) {char c = charArray[i];if (_isTrimable(c, exceptions)) {x = i + 1;}else {break;}}if ((x != 0) || (y != len)) {return s.substring(x, y);}else {return s;}}public static String trimTrailing(String s) {return trimTrailing(s, null);}public static String trimTrailing(String s, char c) {return trimTrailing(s, new char[] {c});}public static String trimTrailing(String s, char[] exceptions) {if (s == null) {return null;}char[] charArray = s.toCharArray();int len = charArray.length;int x = 0;int y = charArray.length;for (int i = len - 1; i >= 0; i--) {char c = charArray[i];if (_isTrimable(c, exceptions)) {y = i;}else {break;}}if ((x != 0) || (y != len)) {return s.substring(x, y);}else {return s;}}public static String upperCase(String s) {if (s == null) {return null;}else {return s.toUpperCase();}}public static String upperCaseFirstLetter(String s) {char[] chars = s.toCharArray();if ((chars[0] >= 97) && (chars[0] <= 122)) {chars[0] = (char)(chars[0] - 32);}return new String(chars);}public static String wrap(String text) {return wrap(text, 80, StringPool.NEW_LINE);}public static String wrap(String text, int width, String lineSeparator) {if (text == null) {return null;}StringBuilder sb = new StringBuilder();try {BufferedReader br = new BufferedReader(new StringReader(text));String s = StringPool.BLANK;while ((s = br.readLine()) != null) {if (s.length() == 0) {sb.append(lineSeparator);}else {String[] tokens = s.split(StringPool.SPACE);boolean firstWord = true;int curLineLength = 0;for (int i = 0; i < tokens.length; i++) {if (!firstWord) {sb.append(StringPool.SPACE);curLineLength++;}if (firstWord) {sb.append(lineSeparator);}sb.append(tokens[i]);curLineLength += tokens[i].length();if (curLineLength >= width) {firstWord = true;curLineLength = 0;}else {firstWord = false;}}}}}catch (IOException ioe) {_log.error(ioe.getMessage());}return sb.toString();}private static boolean _isTrimable(char c, char[] exceptions) {if ((exceptions != null) && (exceptions.length > 0)) {for (int i = 0; i < exceptions.length; i++) {if (c == exceptions[i]) {return false;}}}return Character.isWhitespace(c);}private static Log _log = LogFactoryUtil.getLog(StringUtil.class);}
其他工具类
- 集合的泛型帮助类：MapUtil、ListUtil
- Base64的转换：Base64
- http参数帮助，编解码工具：HttpUtil
- 文件操作：FileUtil
- 类型工具：ClassUtil：
- 常用字符串静态类：StringPool
其中StringPool定义了一些final值，可以利用起来：
package com.liferay.portal.kernel.util;public class StringPool {public static final String AMPERSAND = "&";public static final String AMPERSAND_ENCODED = "&";public static final String APOSTROPHE = "'";public static final String AT = "@";public static final String BACK_SLASH = "\\";public static final String BETWEEN = "BETWEEN";public static final String BLANK = "";public static final String CDATA_OPEN = "<![CDATA[";public static final String CDATA_CLOSE = "]]>";public static final String CLOSE_BRACKET = "]";public static final String CLOSE_CURLY_BRACE = "}";public static final String CLOSE_PARENTHESIS = ")";public static final String COLON = ":";public static final String COMMA = ",";public static final String COMMA_AND_SPACE = ", ";public static final String DASH = "-";public static final String DOUBLE_APOSTROPHE = "''";public static final String DOUBLE_CLOSE_BRACKET = "]]";public static final String DOUBLE_OPEN_BRACKET = "[[";public static final String DOUBLE_SLASH = "//";public static final String EQUAL = "=";public static final String GREATER_THAN = ">";public static final String GREATER_THAN_OR_EQUAL = ">=";public static final String FALSE = "false";public static final String FORWARD_SLASH = "/";public static final String FOUR_SPACES = " ";public static final String IS_NOT_NULL = "IS NOT NULL";public static final String IS_NULL = "IS NULL";public static final String LESS_THAN = "<";public static final String LESS_THAN_OR_EQUAL = "<=";public static final String LIKE = "LIKE";public static final String MINUS = "-";public static final String NBSP = " ";public static final String NEW_LINE = "\n";public static final String NOT_EQUAL = "!=";public static final String NOT_LIKE = "NOT LIKE";public static final String NULL = "null";public static final String OPEN_BRACKET = "[";public static final String OPEN_CURLY_BRACE = "{";public static final String OPEN_PARENTHESIS = "(";public static final String PERCENT = "%";public static final String PERIOD = ".";public static final String PIPE = "|";public static final String PLUS = "+";public static final String POUND = "#";public static final String QUESTION = "?";public static final String QUOTE = "\"";public static final String RETURN = "\r";public static final String RETURN_NEW_LINE = "\r\n";public static final String SEMICOLON = ";";public static final String SLASH = FORWARD_SLASH;public static final String SPACE = " ";public static final String STAR = "*";public static final String TILDE = "~";public static final String TRUE = "true";public static final String UNDERLINE = "_";public static final String UTF8 = "UTF-8";}
简单、优雅、有序才是真的美。
