JAVA 获取某个盘符下所有文件夹及其文件路径，并返回标准JSON字符串

本文借鉴网络上的写法，由于仓促忘记了打开的是哪个网页，希望不要介意。
拿过来代码，发现逻辑虽然通，但由于json字符串拼装错误，导致返回的字符串并不正确，所以拿来优化了一下：

DirectoryUtils dir =new DirectoryUtils();String json=dir.scan(rootPath)+"}";

package com.googosoft.util;import com.alibaba.fastjson.JSON;import java.io.File;import java.util.Arrays;public class DirectoryUtils {    StringBuilder buf=new StringBuilder();    public String scan(String path) {        File f = new File(path);        if (f.isDirectory())        {            scan(new File(path));            buf.delete(buf.length() - 2, buf.length());        }        else {            System.out.format("{\"name\" : \"%s\"}", f.getName());        }        return buf.toString();    }    private void scan(File f) {        if (f.isDirectory())        {            buf.append("{").append("\"name\" : \"").append(f.getName()).append("\",").append("\"filePath\":\"\",").append("\"isDir\":\"0\",").append("\"children\":[");            Arrays.asList(f.listFiles()).forEach(this::scan);            if(buf.toString().endsWith("\"children\":["))                buf.append("{\"name\":\"暂无文件\",\"path\":\"\",\"isDir\":\"0\"},");            buf.delete(buf.length() - 2, buf.length());            buf.append("}").append("]").append("},");        }        else  buf.append("{").append("\"name\" : \"").append(f.getName()).append("\"").append(",\"filePath\":").append(JSON.toJSONString(f.getAbsolutePath())).append(",\"isDir\":\"1\"").append("},");    }}

{    "name": "fileupload",    "children": [        {            "name": "文件夹A",            "children": [                {                    "name": "0001",                    "children": [                        {                            "name": "2017-09-29",                            "children": [                                {                                    "name": "crash-2017-09-29-1506665339302.log",                                    "path": "D: \\IdeaTomcat\\apache-tomcat-7.0.43-PB\\fileupload\\文件夹A\\0001\\2017-09-29\\crash-2017-09-29-1506665339302.log"                                }                            ]                        }                    ]                }            ]        },        {            "name": "文件夹B",            "children": [                {                    "name": "0001",                    "children": [                        {                            "name": "2017-09-29",                            "children": []                        }                    ]                }            ]        }    ]}

如果结合LayUi tree，对象类是这样的

public class Directory {    private String name;//文件夹名    private List<String> children;//子文件夹    private String path;//文件路径    private String isDir;//是否是文件夹    public String getName() {        return name;    }    public void setName(String name) {        this.name = name;    }    public List<String> getChildren() {        return children;    }    public void setChildren(List<String> children) {        this.children = children;    }    public String getPath() {        return path;    }    public void setPath(String path) {        this.path = path;    }    public String getIsDir() {        return isDir;    }    public void setIsDir(String isDir) {        this.isDir = isDir;    }}

前台在需要的地方，只需要引用这样一句话就OK

${Directory.children}

效果图