package utils;

import java.util.Locale;

public class StringUtils {

/**

* 将string按需要格式化,前面加缩进符,后面加换行符

* @param tabNum 缩进量

* @param srcString

* @return

*/

public static String formatSingleLine(int tabNum, String srcString) {

StringBuilder sb = new StringBuilder();

for(int i=0; i<tabNum; i++) {

sb.append("\t");

}

sb.append(srcString);

sb.append("\n");

return sb.toString();

}

public static String firstToUpperCase(String key) {

return key.substring(0, 1).toUpperCase(Locale.getDefault()) + key.substring(1);

}

/**

* 驼峰转下划线命名

*/

public static String camel2underline(String src) {

StringBuilder sb = new StringBuilder();

StringBuilder sbWord = new StringBuilder();

char[] chars = src.trim().toCharArray();

for (int i = 0; i < chars.length; i++) {

char c = chars[i];

if(c >= 'A' && c <= 'Z') {

// 一旦遇到大写单词，保存之前已有字符组成的单词

if(sbWord.length() > 0) {

if(sb.length() > 0) {

sb.append("_");

}

sb.append(sbWord.toString());

}

sbWord = new StringBuilder();

}

sbWord.append(c);

}

if(sbWord.length() > 0) {

if(sb.length() > 0) {

sb.append("_");

}

sb.append(sbWord.toString());

}

return sb.toString();

}

}