直接贴代码吧

public class TqPath2CatalogUtils {
    public static class Catalog {
        private String name;
        @JsonIgnore
        private int level;
        private List<Catalog> children;
        public Catalog(String name) {
            this.name = name;
            children = new LinkedList<>();
        }
        public Catalog(String name,int level) {
            this.name = name;
            this.level = level;
            children = new LinkedList<>();
        }
        public String getName() {
            return name;
        }
        public void setName(String name) {
            this.name = name;
        }
        public void addChild(String name) {
            for (Catalog catalog: children) {
                if (name.equals(catalog.name)){
                    return ;
                }
            }
            children.add(new Catalog(name));
        }
        public void addChild(String name,int level) {
            for (Catalog catalog: children) {
                if (name.equals(catalog.name) && level == catalog.getLevel()){
                    return ;
                }
            }
            children.add(new Catalog(name,level));
        }
        public List<Catalog> getChildren() {
            return children;
        }
        public void setChildren(List<Catalog> children) {
            this.children = children;
        }
        public int getLevel() {
            return level;
        }
        public void setLevel(int level) {
            this.level = level;
        }
    }
    /**1、第一步，先把所有的路径单独拆出来构建目录树*/
    public static List<Catalog> array2Catalogs(String[] paths,String separator){
        List<Catalog> catalogs = new LinkedList<>();
        for (String path : paths) {
            String[] s = path.split(separator);
            if (s.length > 0){
                for (int i = 0; i < s.length; i++) {
                    String name = s[i];
                    Catalog curCatalog = null;
                    boolean isExist = false;
                    for (Catalog catalog : catalogs) {
                        if (catalog.getName().equals(name) && i==catalog.getLevel()){
                            curCatalog = catalog;
                            isExist = true;
                        }
                    }
                    if (!isExist){
                        curCatalog = new Catalog(name,i);
                    }
                    if (i!=s.length-1){
                        curCatalog.addChild(s[i+1],i+1);
                    }
                    if (!isExist){
                        catalogs.add(curCatalog);
                    }
                }
            }
        }
        return catalogs;
    }

    /**2、第二步，基于单独构建的目录树，构建一个统一的树根，那就是链表中的第一个元素*/
    public static void buildCatalogTree(List<Catalog> catalogs, Catalog catalog){
        if (catalogs==null || catalogs.size()==0 ||
                catalog.getChildren() == null || catalog.getChildren().size()==0){
            return;
        }
        List<Catalog> childs = catalog.getChildren();
        List<Catalog> newChilds = new ArrayList<>();
        int len = catalogs.size();
        for (int i = 1; i < len; i++) {
            Catalog cat = catalogs.get(i);
            String catName = cat.getName();
            int level = cat.getLevel();
            for (Catalog child : childs) {
                String name = child.getName();
                if (catName.equals(name) && level == child.getLevel()){
                    newChilds.add(cat);
                }
            }
        }
        if (newChilds.size()>0){
            catalog.setChildren(newChilds);
        }
        for (Catalog newChild : newChilds) {
            buildCatalogTree(catalogs,newChild);
        }
    }
}