递归遍历子部门获取部门号

import com.alibaba.fastjson.JSONArray;
import com.alibaba.fastjson.JSONObject;
import lombok.Data;

import java.io.*;
import java.util.ArrayList;
import java.util.List;

public class readTxt {
    public static void main(String[] args) throws IOException {
        String encoding = "GBK";
        File aa = new File("D:/1.txt");//存企业微信部门列表json格式
        File diapipei = new File("D:/2.txt");//放要转换的xxx/xxxx/xxx/xx部门形式
        InputStreamReader read = new InputStreamReader(new FileInputStream(aa), encoding);
        BufferedReader bufferedReader = new BufferedReader(read);
        String lineTxt = null;
        StringBuffer sb = new StringBuffer();
        while ((lineTxt = bufferedReader.readLine()) != null) {
            sb.append(lineTxt);
        }
        JSONArray jsonArray = JSONArray.parseArray(sb.toString());
        List pro = new ArrayList();
        for (int i = 0; i < jsonArray.size(); i++) {
            JSONObject json = jsonArray.getJSONObject(i);
            String name = json.getString("name");
            String id = json.getString("id");
            String pid = json.getString("parentid");
            province pi = new province();
            pi.setId(id);
            pi.setName(name);
            pi.setPid(pid);
            pro.add(pi);
        }
        //读2.txt
        InputStreamReader read1 = new InputStreamReader(new FileInputStream(diapipei), encoding);
        BufferedReader bufferedReader1 = new BufferedReader(read1);
        String lineTxt1 = null;
        while ((lineTxt1 = bufferedReader1.readLine()) != null) {
            String getid = toid(pro,lineTxt1);
            System.out.println(getid);
        }
        read.close();
    }
    @Data
    static class province{
        private  String name;
        private  String id;
        private  String pid;
    }
    public static String toid(List array,String aa){
        String [] mao = aa.split(";");//有多个部门用；（这里对有2个部门的处理）
        if(mao.length>1){
            String aa1 = mao[0];
            String [] len1 = aa1.split("/");
            Boolean tou1 = len1[0].matches("^([1-9]\\d*)|(([1-9]\\d*|0)\\.\\d+)$");//判断是否为数字
            aa1 = pipei(tou1,array,len1, aa1);
            aa1 = toid(array, aa1);
            String aa2 = mao[1];
            String [] len2 = aa2.split("/");
            Boolean tou2 = len2[0].matches("^([1-9]\\d*)|(([1-9]\\d*|0)\\.\\d+)$");
            aa2 = pipei(tou2,array,len2, aa2);
            aa2 = toid(array, aa2);
            aa = aa1+";"+aa2;
        }
        else {
            String[] len = aa.split("/");
            Boolean tou = len[0].matches("^([1-9]\\d*)|(([1-9]\\d*|0)\\.\\d+)$");
            if (len.length > 1) {//如果还有子部门
                aa = pipei(tou, array, len, aa);
                aa = toid(array, aa);
            }
        }
        return aa;
    }
    public static String pipei(Boolean boo,List array,String [] len,String aa){
        if(boo){//如果头部为数字替换"xx/xxx"
            for(int i=0;i