[javaSE] java获取文件列表

递归测试

import java.io.File;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

public class FilesDemo {
    private static final String FILE_PATH = "./";
    private static List<Map<String, String>> FileList;

    public static void main(String[] args) {
        listFiles(new File(FILE_PATH), 1);
        // for(Map<String,String> item:FileList){
        // System.out.println("{name:"+item.get("name")+",level:"+item.get("level")+"}");
        // }
    }

    public static void listFiles(File file, int level) {
        FileList = new ArrayList<>();
        Map<String, String> item;
        File[] files = file.listFiles();
        if (file.list().length != 0) {
            for (File fileTemp : files) {
                String fileName = fileTemp.getName();
                System.out.println(getLevelPrefix(level) + fileName);

                if (fileTemp.isDirectory() && fileTemp.list().length > 0) {
                    listFiles(fileTemp, level + 1);
                } else {
                    item = new HashMap<String, String>();
                    item.put("name", fileTemp.getName());
                    item.put("level", String.valueOf(level));

                    FileList.add(item);
                }
            }
        } else {
            System.out.println(getLevelPrefix(level) + file.getName());
        }

    }

    public static String getLevelPrefix(int level) {
        StringBuilder sb = new StringBuilder();
        for (int i = 1; i < level; i++) {
            sb.append("    ");
        }
        sb.append("|--");
        return sb.toString();
    }
}