Java 递归遍历实现linux tree命令方式

import java.io.File;
import java.util.Stack;
public class TraversalFile {
	
	public static void main(String[] args) {
		File dir = new File("D:/Study/code/Java/TraversalFile");
		traversal(dir,1);
	}
 
	public TraversalFile() {
		// TODO Auto-generated constructor stub
	}
	
	public static void traversal(File file,int depth) {
		printName(file, depth);
		File[] fileArray = file.listFiles();
		
		Stack<File> stack = new Stack<File>();
		for(File f:fileArray) {
			if(f.isFile()) {
				printName(f, depth + 1);				
			}
			else {
				stack.add(f);
			}
		}
		
		while(stack.isEmpty() == false) {
			traversal(stack.pop(),depth + 1);
		}
	}
	
	public static void printName(File f, int signNum) {
		StringBuilder builder = new StringBuilder();
		//signNum个sign
		
		for(int i=0;i<signNum;i++){		   
		   if(i == signNum - 1)
			   builder.append("|--"); 
		   else
			   builder.append("  ");
		}
		
		String str = builder.toString();
		System.out.println(str + f.getName());
	}
}

	public static void traversal(File file,int depth) {
		printName(file, depth);
		File[] fileArray = file.listFiles();
		
		Stack<File> stack = new Stack<File>();
		for(File f:fileArray) {
			if(f.isFile()) {
				printName(f, depth + 1);				
			}
			else {
				stack.add(f);
			}
		}
		
		while(stack.isEmpty() == false) {
			traversal(stack.pop(),depth + 1);
		}
	}

	public static void traversal(File file,int depth) {
		printName(file, depth);		
		if (file.isFile())
			return;		
		File[] fileArray = file.listFiles();
		for(File f:fileArray) {
			traversal(f, depth + 1);
		}
	}

	public static void printName(File f, int signNum) {
		StringBuilder builder = new StringBuilder();
		//signNum个sign
		
		for(int i=0;i<signNum;i++){		   
		   if(i == signNum - 1)
			   builder.append("|--"); 
		   else
			   builder.append("  ");
		}
		
		String str = builder.toString();
		System.out.println(str + f.getName());
	}

public class CategoryVO {
	private Integer id;
	private Integer pId;
	private String name;
	private String url;
	private List<CategoryVO> children=new ArrayList<CategoryVO>();
	//get set 省略
}

public List<CategoryVO> list(String name,Model model){
		List<CategoryVO> categoryList = CategoryJDBC.getCategoryList();
		
		HashMap<Integer, CategoryVO> tmpMap = new HashMap<>(); // 所有对象存放到map中
		for (CategoryVO categoryVO : categoryList) {
			tmpMap.put(categoryVO.getId(), categoryVO);
		}
		
		ArrayList<CategoryVO> arrayList = new ArrayList<>(); // 结果list，之所以用list，是考虑到有多个根目录的情况
		for (CategoryVO categoryVO : categoryList) {  // 遍历所有元素，放到对应的父节点
			if(tmpMap.get(categoryVO.getpId())!=null && categoryVO.getId()!=categoryVO.getpId() ){
				CategoryVO categoryVO2 = tmpMap.get(categoryVO.getpId()); //map中找到父节点
				List<CategoryVO> children = categoryVO2.getChildren(); 
				children.add(categoryVO); // 添加到父节点的children里
				categoryVO2.setChildren(children); 
				tmpMap.put(categoryVO2.getId(), categoryVO2); //重置添加children后的map
				
			}else{
				arrayList.add(categoryVO);
			}
		}
		return categoryList;
	}