用java編程模仿DOS下的dir命令，列出某個目錄下的內容

用遞歸的方法實現。

import java.io.File;
import java.util.Scanner;

public class ListFiles {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		System.out.print("C:\\Users\\Administrator>");
		String scin = sc.nextLine(); //模仿DOS輸入，比如dir E:\360Downloads
		String path = scin.substring(scin.lastIndexOf(" ")+1); //獲取目錄，比如E:\360Downloads
		path = path.replaceAll("\\\\", "\\\\\\\\");//把\變成\\，比如E:\\360Downloads
		File file = new File(path);
		listFiles(file,0);
		sc.close();
	}

	public static void listFiles(File file,int level){
		if(file.exists()){
			if(file.isDirectory()){
				for(int i=0;i<level;i++){
					System.out.print("   ");
				}
				System.out.println("|--"+file.getName());
				level++;
				File[] files = file.listFiles();
				for(File f:files){
					listFiles(f,level);
				}
			}else if(file.isFile()){
				for(int i=0;i<level;i++){
					System.out.print("   ");
				}
				System.out.println("|--"+file.getName());
			}
		}
	}
}

運行結果：

C:\Users\Administrator>dir E:\360Downloads
|--360Downloads
   |--Software
      |--hotfix
         |--NDP40-KB2729449-x86.exe.mem
         |--NDP40-KB2729449-x86.exe.P2P
         |--NDP40-KB2729449-x86.exe.trt
         |--windows6.1-kb3212642-x86_d5906af5f1f0dc07a5239311b169619ce255ab12.msu.mem
         |--windows6.1-kb3212642-x86_d5906af5f1f0dc07a5239311b169619ce255ab12.msu.P2P
         |--windows6.1-kb3212642-x86_d5906af5f1f0dc07a5239311b169619ce255ab12.msu.trt
         |--windows6.1-kb4012212-x86_6bb04d3971bb58ae4bac44219e7169812914df3f.msu.mem
         |--windows6.1-kb4012212-x86_6bb04d3971bb58ae4bac44219e7169812914df3f.msu.P2P
         |--windows6.1-kb4014565-x86_a8749d60fb61f5558fbb501d4ca68b978e3742c3.msu.mem
         |--windows6.1-kb4014565-x86_a8749d60fb61f5558fbb501d4ca68b978e3742c3.msu.P2P
         |--windows6.1-kb4014565-x86_a8749d60fb61f5558fbb501d4ca68b978e3742c3.msu.trt
         |--windows6.1-kb4015546-x86_a753365290d940872860776113f226436a18ca9b.msu.mem
         |--windows6.1-kb4015546-x86_a753365290d940872860776113f226436a18ca9b.msu.P2P