将驼峰命名转换为数据库字段

代码演示

• 方法一

    public static String HumpToUnderline(String para){
        StringBuilder sb=new StringBuilder(para);
        int temp=0;
        if (!para.contains("_")) {
            for(int i=0;i<para.length();i++){
                if(Character.isUpperCase(para.charAt(i))){
                    sb.insert(i+temp, "_");
                    temp+=1;
                }
            }
        }
        return sb.toString().toLowerCase();
    }

• 方法二

    public String HumpToUnderline_1(String str){
        StringBuilder sb=new StringBuilder();
        char[] chars = str.toCharArray();
        for (char c : chars) {
            if (Character.isUpperCase(c)){
                sb.append(StringUtils.join("_", c).toLowerCase());
                continue;
            }
            sb.append(c);
        }
        return sb.toString();
    }

测试代码

    public void test_line(){
        // 方法一
        String thisIsAnApple = HumpToUnderline("thisIsAnApple");
        System.out.println(thisIsAnApple);
        // 方法二
        String thisIsAnApple_1 = HumpToUnderline_1("thisIsAnApple");
        System.out.println(thisIsAnApple_1);
    }

运行结果

this_is_an_apple
this_is_an_apple

Process finished with exit code 0