直接上代码 :
package com.utils;
public class ChangeChar {
public static final char UNDERLINE = '_';
public static void main(String[] args) {
/*驼峰转下划线*/
String str = " itemName bbbbCsss , \n" +
" category ,\n" +
"\tbarCode\t \n" +
"\tvolume\t \n" +
"\tlength\t \n" +
"\twidth\t \n" +
"\theight\t \n" +
"\tunitPrice\t \n" +
"\tshelfLife\t \n" +
"\tshelfLifeUnit\t /\n" +
"\t ）";
/*下划线转驼峰*/
String str2 = " ITEM_NAME , \n" +
" CATEGORY ,\n" +
"\tBAR_CODE\t \n" +
"\tVOLUME\t \n" +
"\tLENGTH\t \n" +
"\tWIDTH\t \n" +
"\tHEIGHT\t \n" +
"\tUNIT_PRICE\t \n" +
"\tSHELF_LIFE\t \n" +
"\tSHELF_LIFE_UNIT\t";
/**
* 测试
* */
/* charType=2 表示大写, 其他情况都是小写*/
String STR_ABC = camelToUnderline(str, 2); // 下划线大写:ABC_DEF
String str_abc = camelToUnderline(str, 1); // 下划线小写:abc_def
System.out.println("驼峰转化成下划线大写 :" + STR_ABC);
System.out.println("驼峰转化成下划线小写 :" + str_abc);
String strAbc = underlineToCamel(str2); // 下划线转驼峰:abcDef
System.out.println("下划线化成驼峰 :" + strAbc);
}
//驼峰转下划线
public static String camelToUnderline(String param, Integer charType) {
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);
}
if (charType == 2) {
sb.append(Character.toUpperCase(c)); //统一都转大写
} else {
sb.append(Character.toLowerCase(c)); //统一都转小写
}
}
return sb.toString();
}
//下划线转驼峰
public static String underlineToCamel(String param) {
if (param == null || "".equals(param.trim())) {
return "";
}
int len = param.length();
StringBuilder sb = new StringBuilder(len);
Boolean flag = false; // "_" 后转大写标志,默认字符前面没有"_"
for (int i = 0; i < len; i++) {
char c = param.charAt(i);
if (c == UNDERLINE) {
flag = true;
continue; //标志设置为true,跳过
} else {
if (flag == true) {
//表示当前字符前面是"_" ,当前字符转大写
sb.append(Character.toUpperCase(param.charAt(i)));
flag = false; //重置标识
} else {
sb.append(Character.toLowerCase(param.charAt(i)));
}
}
}
return sb.toString();
}
}