mapper中resultMap生成器

public class MybatisUtil {
    // 获取bean的属性 根据属性评价 resultMap
    // 并将驼峰修改为'_'
    public static String getResultMap(Class<?> cls) throws Exception {
        String str = "";
        str = "<resultMap id=\"" +cls.getSimpleName().substring(0, 1).toLowerCase() + cls.getSimpleName().substring(1) + "ResultMap\" type=\"" + cls.getName() + "\"> \r\n";
        //str = str + "<id column= \"\""   +  " property= \"\"" +  " />" + " \r\n";
        // 每一行字符串
        String linestr = "";
        Field[] declaredFields = cls.getDeclaredFields();
        for (Field field : declaredFields) {
            linestr = "<result column=\"" + getUpCaseReplace(field.getName()) + "\" property=\"" + field.getName() + "\" />";
            linestr += "\r\n";
            str += linestr;
        }
        str+="</resultMap>";
        return str;
    }

    public static String getAllField(Class<?> cls) throws Exception {
        String str = "";
        // 每一行字符串
        String linestr = "";
        Field[] declaredFields = cls.getDeclaredFields();
        int i = 0;
        for (Field field : declaredFields) {
            linestr = getUpCaseReplace(field.getName()) + ", ";
            if (i % 4 == 0 && i != 0){
                linestr += "\r\n";
            }
            str += linestr;
            i++;
        }
        return str.substring(0,str.length()-2);
    }

    /**
     * 将字符串中的驼峰写法替换成'_'
     *
     * @param str
     * @return
     */
    private static String getUpCaseReplace(String str) {
        List<String> listChar = getUpCaseList(str);
        //先将字原属性加上"_"和原属性的首字母大写
        for (int i = 0; i < listChar.size(); i++) {
            str = str.replace(listChar.get(i), "_" + listChar.get(i).toUpperCase());
        }
        //将字段全部装换为大写
        String result = str.toUpperCase();
        return result;
    }

    /**
     * @Description: 输出字符串中的大写字母
     * @param str
     */
    private static List<String> getUpCaseList(String str) {
        List<String> listChar = new ArrayList<String>();
        // 转为char数组
        char[] ch = str.toCharArray();
        // 得到大写字母
        for (int i = 0; i < ch.length; i++) {
            if (ch[i] >= 'A' && ch[i] <= 'Z') {
                listChar.add(String.valueOf(ch[i]));
            }
        }
        return listChar;
    }

    public static void main(String[] args) throws Exception {
        //TODO 需要生成的属性
        Userinfo a = new Userinfo();
        System.out.println(getResultMap(a.getClass()));
        //所有属性
        System.out.println("------------------------------------------------------------------------");
        System.out.println(getAllField(a.getClass()));
    }
}