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Comprehensive Java common library (Java7+)
/*
* Copyright (C) 2015-2017 S.Violet
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* Project GitHub: https://github.com/shepherdviolet/thistle
* Email: [email protected]
*/
package sviolet.thistle.util.conversion;
import java.io.PrintWriter;
import java.io.StringWriter;
import java.io.Writer;
import java.math.BigDecimal;
import java.util.ArrayList;
import java.util.List;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
/**
* 字符串工具
* @author S.Violet
*/
public class StringUtils {
private static final String DECODE_DEC_UNICODE_REGEXP = "&#\\d*;";
/**
* 将字符串指定位置变为大写(字母)
* @param src 源字符串
* @param positions 变为大写的位置[0, length)
* @return 变换后的字符串
*/
public static String toUpperCase(String src, int... positions){
if (src == null) {
return null;
}
char[] chars = src.toCharArray();
for (int position : positions){
if(position < chars.length && position > -1){
chars[position] -= (chars[position] > 96 && chars[position] < 123) ? 32 : 0;
}
}
return String.valueOf(chars);
}
/**
* 将字符串指定位置变为小写(字母)
* @param src 源字符串
* @param positions 变为小写的位置[0, length)
* @return 变换后的字符串
*/
public static String toLowerCase(String src, int... positions){
if (src == null) {
return null;
}
char[] chars = src.toCharArray();
for (int position : positions){
if(position < chars.length && position > -1){
chars[position] += (chars[position] > 64 && chars[position] < 91) ? 32 : 0;
}
}
return String.valueOf(chars);
}
/**
* 将字符串中的数字字母标点转为全角
* @param src 原字符串
* @return 全角字符串
*/
public static String toSBCCase(String src) {
if (src == null) {
return null;
}
char[] charArray = src.toCharArray();
for (int i = 0; i< charArray.length; i++) {
if (charArray[i] == 12288) {
charArray[i] = (char) 32;
}else if (charArray[i] > 65280 && charArray[i] < 65375) {
charArray[i] = (char) (charArray[i] - 65248);
}
}
return new String(charArray);
}
/**
* 把异常转为String信息
*/
public static String throwableToString(Throwable throwable) {
if (throwable == null){
return null;
}
Writer writer = new StringWriter();
PrintWriter printWriter = new PrintWriter(writer);
throwable.printStackTrace(printWriter);
printWriter.close();
return writer.toString();
}
/**
* 将包含十进制Unicode编码的String, 转为普通编码的String
*
* 例如:"马特•达蒙"转为"马特•达蒙"
*/
public static String decodeDecUnicode(String string){
if (string == null){
return null;
}
Matcher matcher = Pattern.compile(DECODE_DEC_UNICODE_REGEXP).matcher(string);
StringBuffer stringBuffer = new StringBuffer();
while (matcher.find()) {
String s = matcher.group(0);
s = s.replaceAll("(&#)|;", "");
char c = (char) Integer.parseInt(s);
matcher.appendReplacement(stringBuffer, Character.toString(c));
}
matcher.appendTail(stringBuffer);
return stringBuffer.toString();
}
/**
* 检查string中是否包含keywords
* @param string string
* @param keywords keywords
* @return true:包含
*/
public static boolean contains(String string, String keywords){
if (string == null){
return false;
}
return string.contains(keywords);
}
/**
* Excel文件数值进度丢失特征: 小数第三位第四位第五位为000或999
*/
private static Pattern resolveExcelPrecisionProblemPattern = Pattern.compile("^(-?\\d+\\.\\d{2})(000|999)(\\d)*$");
/**
* [特殊]通常用于处理Excel文件数据,
* 因为Excel的数值有可能存在进度丢失的问题, 例如1.67变成1.669999999...3, 本方法专门识别这种情况, 并纠正精度丢失.
* @param string excel中读取的数值, 例如1.669999999...3
* @return 纠正后的数值, 例如1.67
*/
public static String resolveExcelPrecisionProblem(String string){
if (string == null || !resolveExcelPrecisionProblemPattern.matcher(string).matches()){
return string;
}
return new BigDecimal(string).setScale(2, BigDecimal.ROUND_HALF_UP).toString();
}
/**
* 使用指定字符分割字符串, 忽略空白项, 去除头尾空白, 返回List
*
*
* 例如:
* splitAndTrim(" abc, def, ,ghj,,klm ", ",")
* 结果为:
* 'abc' 'def' 'ghj', 'klm'
*
*
* @param string 被切割的字符串
* @param splitRegex 切割的字符
* @return Not Null
*/
public static List splitAndTrim(String string, String splitRegex) {
if (string == null) {
return new ArrayList<>(0);
}
String[] array = string.split(splitRegex);
List result = new ArrayList<>(array.length);
for (String item : array) {
if (item == null || item.length() <= 0) {
continue;
}
String trimmed = item.trim();
if (trimmed.length() <= 0) {
continue;
}
result.add(trimmed);
}
return result;
}
}