CharUtils.java
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package com.yoho.datasync.producer.common.utils;
import org.apache.commons.lang3.StringUtils;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class CharUtils {
/**
* 将字符转换成大写，如a->A
*
* @param c
* @return
*/
public static char toUpperCase(char c) {
if (c < 97 || c > 122)
return c;
else
return (char) (c - 32);
}
/**
* 将字符转换成小写，如A->a
*
* @param c
* @return
*/
public static char toLowerCase(char c) {
if (c < 65 || c > 90)
return c;
else
return (char) (c + 32);
}
public static boolean isLowerCase(char c) {
return (c >= 'a' && c <= 'z');
}
public static boolean isUpperCase(char c) {
return (c >= 'A' && c <= 'Z');
}
public static String getLowerCaseNames(String names) {
StringBuilder sb = new StringBuilder();
char[] cc = names.toCharArray();
sb.append(toLowerCase(cc[0]));
for (int i = 1; i < cc.length; i++) {
if (isLowerCase(cc[i - 1]) && isUpperCase(cc[i])) {
sb.append("_" + toLowerCase(cc[i]));
} else {
sb.append(toLowerCase(cc[i]));
}
}
;
return sb.toString();
}
/**
* 将驼峰风格替换为下划线风格
*
* @param str
* @return
*/
public static String CamelhumpToUnderline(String str) {
Matcher matcher = Pattern.compile("[A-Z]").matcher(str);
StringBuilder builder = new StringBuilder(str);
for (int i = 0; matcher.find(); i++) {
builder.replace(matcher.start() + i, matcher.end() + i, "_" + matcher.group().toLowerCase());
}
if (builder.charAt(0) == '_') {
builder.deleteCharAt(0);
}
return builder.toString();
}
/**
* 将下划线风格替换为驼峰风格
*
* @param str
* @return
*/
public static String underlineToCamelhump(String str) {
Matcher matcher = Pattern.compile("_[a-z]").matcher(str);
StringBuilder builder = new StringBuilder(str);
for (int i = 0; matcher.find(); i++) {
builder.replace(matcher.start() - i, matcher.end() - i, matcher.group().substring(1).toUpperCase());
}
if (Character.isUpperCase(builder.charAt(0))) {
builder.replace(0, 1, String.valueOf(Character.toLowerCase(builder.charAt(0))));
}
return builder.toString();
}
public static String underlineToCamelhumpWithNumber(String str) {
Matcher matcher = Pattern.compile("_[a-z0-9]").matcher(str);
StringBuilder builder = new StringBuilder(str);
for (int i = 0; matcher.find(); i++) {
builder.replace(matcher.start() - i, matcher.end() - i, matcher.group().substring(1).toUpperCase());
}
if (Character.isUpperCase(builder.charAt(0))) {
builder.replace(0, 1, String.valueOf(Character.toLowerCase(builder.charAt(0))));
}
return builder.toString();
}
public static String getBeanName(String str) {
StringBuilder builder = new StringBuilder(str);
builder.replace(0, 1, String.valueOf(Character.toUpperCase(builder.charAt(0))));
return builder.toString();
}
public static boolean isNumeric(String str) {
Pattern pattern = Pattern.compile("[0-9]*");
Matcher isNum = pattern.matcher(str);
if (!isNum.matches()) {
return false;
}
return true;
}
public static String standardized(String str){
if(StringUtils.isEmpty(str)){
return str;
}
return str.trim().toLowerCase().replaceAll(" ", "");
}
public static void main(String[] args) {
System.out.println(isLowerCase('C'));
String s1 = "size_attribute";
System.out.println(underlineToCamelhump(s1));
String s2 = "hserInfo";
System.out.println(getLowerCaseNames(s2));
String s3 = "brand";
System.out.println(getBeanName(s3));
String s4 = "skn_7_days_view";
System.out.println(underlineToCamelhumpWithNumber(s4));
System.out.println(standardized("Vans 卫衣"));
}
}