public static final char UNDERLINE='_';
public static String camelToUnderline(String param){
if (param==null||"".equals(param.trim())){
return "";
}
int len=param.length();
StringBuilder sb=new StringBuilder(len);
for (int i = 0; i < len; i++) {
char c=param.charAt(i);
if (Character.isUpperCase(c)){
sb.append(UNDERLINE);
sb.append(Character.toLowerCase(c));
}else{
sb.append(c);
}
}
return sb.toString();
}
public static String underlineToCamel(String param){
if (param==null||"".equals(param.trim())){
return "";
}
int len=param.length();
StringBuilder sb=new StringBuilder(len);
for (int i = 0; i < len; i++) {
char c=param.charAt(i);
if (c==UNDERLINE){
if (++i<len){
sb.append(Character.toUpperCase(param.charAt(i)));
}
}else{
sb.append(c);
}
}
return sb.toString();
}
public static String underlineToCamel2(String param){
if (param==null||"".equals(param.trim())){
return "";
}
StringBuilder sb=new StringBuilder(param);
Matcher mc= Pattern.compile("_").matcher(param);
int i=0;
while (mc.find()){
int position=mc.end()-(i++);
//String.valueOf(Character.toUpperCase(sb.charAt(position)));
sb.replace(position-1,position+1,sb.substring(position,position+1).toUpperCase());
}
return sb.toString();
}
public static void main(String[] args) {
}
参考自：http://blog.csdn.net/xiejx618/article/details/30129851
Original: https://www.cnblogs.com/tianzhijiexian/p/4723880.html
Author: developer_Kale
Title: java 驼峰字符和下划线字符相互转换工具类
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