StringUtils.java
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package cn.fw.hestia.common.utils;
import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.UUID;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
/**
* 字符串工具
*
* @author: kurisu
* @version: 1.0
*/
public final class StringUtils {
/**
* 空字符串
*/
public static final String EMPTY = "";
/**
* 特殊字符正则表达式
*/
public static final String regEx = "[`~!@#$%^&*()+=|{}':;',\\[\\].<>/?~!@#¥%……&*()——+|{}【】‘;:”“’。,、?]";
public static final String regNo = "^[-\\+]?[\\d]*$";
private StringUtils() {
}
/**
* 首字母小写
*
* @param s String
* @return String
*/
public static String firstCharLowerCase(String s) {
if (isValid(s)) {
return s.substring(0, 1).toLowerCase() + s.substring(1);
}
return s;
}
/**
* 删除前缀
*
* @param s
* @param prefix
* @return
*/
public static String removePrefix(String s, String prefix) {
int index = s.indexOf(prefix);
return index == 0 ? s.substring(prefix.length()) : s;
}
/**
* 删除后缀
*
* @param s
* @param suffix
* @return
*/
public static String removeSuffix(String s, String suffix) {
return s.endsWith(suffix) ? s.substring(0, s.length() - suffix.length()) : s;
}
/**
* 首字母大写
*
* @param s String
* @return String
*/
public static String firstCharUpperCase(String s) {
if (isValid(s)) {
return s.substring(0, 1).toUpperCase() + s.substring(1);
}
return s;
}
/**
* 检查对象是否有效 obj != null && obj.toString().length() > 0
*
* @param obj
* @return boolean
*/
public static boolean isValid(Object obj) {
return obj != null && obj.toString().length() > 0;
}
/**
* 是否是空的
*
* @param obj
* @return
*/
public static boolean isEmpty(Object obj) {
return obj == null || obj.toString().length() == 0;
}
/**
* 是否是数字
*
* @param obj
* @return
*/
public static boolean isNumber(Object obj) {
if (isEmpty(obj)) {
return false;
}
Pattern compile = Pattern.compile(regNo);
return compile.matcher(obj.toString()).matches();
}
/**
* 转化为String对象
*
* @param obj
* @return boolean
*/
public static String asString(Object obj) {
return obj != null ? obj.toString() : "";
}
/**
* 返回其中一个有效的对象 value != null && value.toString().length() > 0
*
* @param values
*/
public static String tryThese(Object... values) {
for (int i = 0; i < values.length; i++) {
String value = StringUtils.asString(values[i]);
if (!value.isEmpty()) {
return value;
}
}
return "";
}
/**
* EL表达式提供的定义方法
*
* @param v1
* @param v2
* @return
*/
public static String tryThese(String v1, String v2) {
return tryThese(new Object[]{v1, v2});
}
/**
* 连接字符串
*
* @param list
* @param split
* @return 字符串
*/
public static <T> String join(T[] list, String split) {
return join(list, split, "");
}
/**
* 连接字符串
*
* @param list
* @param split
* @return 字符串
*/
public static <T> String join(T[] list, String split, String wrap) {
if (list == null) {
return null;
}
StringBuilder s = new StringBuilder(128);
for (int i = 0; i < list.length; i++) {
if (i > 0) {
s.append(split);
}
s.append(wrap + list[i] + wrap);
}
return s.toString();
}
/**
* 连接
*
* @param list
* @param split
* @param wrap
* @return
*/
public static <T> String join(List<T> list, String split, String wrap) {
return join(list.toArray(), split, wrap);
}
/**
* 连接字符串
*
* @param list
* @param split
* @return 字符串
*/
public static String join(List<?> list, String split) {
return join(list.toArray(), split);
}
/**
* 包裹字符串 id:12, {, } 输出 {id:12}
*
* @param input 输入串
* @param begin {
* @param end }
* @return String
*/
public static String wrap(String begin, String input, String end) {
if (!input.startsWith(begin)) {
input = begin + input;
}
if (!input.endsWith(end)) {
input = input + end;
}
return input;
}
/**
* 取得匹配的字符串
*
* @param input
* @param regex
* @return
*/
public static List<String> matchs(String input, String regex) {
return matchs(input, regex, 0);
}
/**
* 取得匹配的字符串
*
* @param input
* @param regex
* @return
*/
public static List<String> matchs(String input, String regex, int group) {
Pattern pattern = Pattern.compile(regex);
Matcher match = pattern.matcher(input);
List<String> matches = new ArrayList<String>();
while (match.find()) {
matches.add(match.group(group));
}
return matches;
}
/**
* 找到匹配的第一个字符串
*
* @param input
* @param regex
* @param group
* @return
*/
public static String matchFirst(String input, String regex, int group) {
List<String> matches = matchs(input, regex, group);
return matches.isEmpty() ? null : matches.get(0);
}
/**
* 截取指定长度字符串
*
* @return
*/
public static String getShorterString(String str, int maxLength) {
return getShorterString(str, "...", maxLength);
}
/**
* 截取指定长度字符串
*
* @param input
* @param tail
* @param length
* @return
*/
public static String getShorterString(String input, String tail, int length) {
tail = isValid(tail) ? tail : "";
StringBuffer buffer = new StringBuffer(512);
try {
int len = input.getBytes("GBK").length;
if (len > length) {
int ln = 0;
for (int i = 0; ln < length; i++) {
String temp = input.substring(i, i + 1);
if (temp.getBytes("GBK").length == 2) {
ln += 2;
} else {
ln++;
}
if (ln <= length) {
buffer.append(temp);
}
}
} else {
return input;
}
buffer.append(tail);
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
}
return buffer.toString();
}
/**
* 取得GBK编码
*
* @return
*/
public static String getBytesString(String input, String code) {
try {
byte[] b = input.getBytes(code);
return Arrays.toString(b);
} catch (UnsupportedEncodingException e) {
return String.valueOf(code.hashCode());
}
}
/**
* 转换格式 CUST_INFO_ID - > custInfoId
*
* @param input
* @return
*/
public static String getFieldString(String input) {
if (input == null) {
return null;
}
String field = input.toLowerCase();
String[] values = field.split("\\_");
StringBuffer b = new StringBuffer(input.length());
for (int i = 0; i < values.length; i++) {
if (i == 0) {
b.append(values[i]);
} else {
b.append(firstCharUpperCase(values[i]));
}
}
return b.toString();
}
/**
* 转换格式 CUST_INFO_ID - > custInfoId
*
* @param columnName
* @return
*/
public static String toFieldName(String columnName) {
return getFieldString(columnName);
}
/**
* 转换格式 custInfoId - > CUST_INFO_ID
*
* @param field
* @return
*/
public static String toColumnName(String field) {
if (field == null) {
return null;
}
StringBuffer b = new StringBuffer(field.length() + 3);
for (int i = 0; i < field.length(); i++) {
Character char1 = field.charAt(i);
if (Character.isUpperCase(char1) && i != 0) {
b.append("_");
}
b.append(char1);
}
return b.toString();
}
/**
* 转化为JSON值
*
* @param value
* @return
* @throws IOException
*/
public static String toJsonValue(Object value) throws IOException {
if (value instanceof Number) {
return value.toString();
} else {
return "'" + value.toString() + "'";
}
}
/**
* 字符串转化为UUID
*
* @param value
* @return
*/
public static String toUUID(String value) {
if (value == null) {
throw new RuntimeException("value is null!");
}
return UUID.nameUUIDFromBytes(value.getBytes()).toString();
}
/**
* 获取Style样式中样式的值
*
* @param styleString
* @param styleName
* @return 相应的值
*/
public static String getStyleValue(String styleString, String styleName) {
String[] styles = styleString.split(";");
for (int i = 0; i < styles.length; i++) {
String tempValue = styles[i].trim();
if (tempValue.startsWith(styleName)) {
String[] style = tempValue.split(":");
return style[1];
}
}
return "";
}
/**
* 生成重复次字符
*
* @param charactor
* @param repeat
* @return
*/
public static String getRepeat(String charactor, int repeat) {
return repeat(charactor, repeat, "");
}
/**
* 生成重复次字符
*
* @param charactor
* @param repeat
* @return
*/
public static String repeat(String charactor, int repeat, String split) {
StringBuilder s = new StringBuilder(charactor.length() * repeat);
for (int i = 0; i < repeat; i++) {
if (i != 0) {
s.append(split != null ? split : "");
}
s.append(charactor);
}
return s.toString();
}
/**
* 取得长度
*
* @param text
* @return
*/
public static int length(String text) {
int len = text.length();
try {
len = text.getBytes("GBK").length;//SQLServer数据库用的GBK编码
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
}
return len;
}
/**
* 字符串替换函数
*
* @param data 字符串
* @param data from 旧值
* @param to from 新值
*/
public static String replaceString(String data, String from, String to) {
StringBuffer buf = new StringBuffer(data.length());
int pos = -1;
int i = 0;
while ((pos = data.indexOf(from, i)) != -1) {
buf.append(data.substring(i, pos)).append(to);
i = pos + from.length();
}
buf.append(data.substring(i));
return buf.toString();
}
/**
* 转义特殊字符
*
* @param s
* @return
*/
public static String escapeQueryChars(String s) {
if (StringUtils.isEmpty(s)) {
return s;
}
StringBuilder sb = new StringBuilder();
//查询字符串一般不会太长,挨个遍历也花费不了多少时间
for (int i = 0; i < s.length(); i++) {
char c = s.charAt(i);
if (c == '\\' || c == '+' || c == '-' || c == '!' || c == '(' || c == ')'
|| c == ':' || c == '^' || c == '[' || c == ']' || c == '\"'
|| c == '{' || c == '}' || c == '~' || c == '*' || c == '?'
|| c == '|' || c == '&' || c == ';' || c == '/' || c == '.'
|| c == '$' || c == '%' || c == '<' || c == '>' || Character.isWhitespace(c)) {
sb.append('\\');
}
sb.append(c);
}
return sb.toString();
}
/**
* 获取默认值
* @param str
* @param defaultStr
* @return
*/
public static String getStrWithDefault(CharSequence str, String defaultStr) {
if (isEmpty(defaultStr)) {
defaultStr = "";
}
if (isEmpty(str)) {
return defaultStr;
}
return str.toString();
}
public static void main(String[] args) {
System.out.println(toUUID("1"));
System.out.println(removePrefix("abcd123", "ab"));
System.out.println(removeSuffix("abcd123", "123"));
System.out.println(toColumnName("usernameId"));
System.out.println(getFieldString("user_name_id"));
System.out.println(repeat("?", 10, ","));
length("AAA中国()111222bb");
}
}