带层级关系的递归遍历目录内容

package filetest;

import java.io.File;

public class FileDemo3 {

public static void main(String[] args) {
File dir = new File("H:\\test\\src");
showDir(dir, 0);
}

public static String getLevel(int level) {
StringBuilder sb = new StringBuilder();
sb.append("|--");
for (int i = 0; i < level; i++) {
sb.insert(0, "|  ");
}
return sb.toString();
}

public static void showDir(File dir, int level) {

System.out.println(getLevel(level) + dir.getName());
level++;
File[] files = dir.listFiles();
for (int i = 0; i < files.length; i++) {
if (files[i].isDirectory())
showDir(files[i], level);
else
System.out.println(getLevel(level) + files[i]);
}
}
}