java遍历文件目录生成树结构txt文件

import java.io.BufferedWriter; import java.io.File; import java.io.FileWriter; import java.io.IOException; public class Dir { public int k=0; public String getStr(int i){ String str=""; for (int j = 0; j <i; j++) { str+="\t"; } return str; } public void sayFileName(File file,BufferedWriter bw) throws IOException{ for(File f:file.listFiles()){ if (f.isDirectory()) { bw.write(getStr(k)+f.getName()+"(dir)"+"\r\n"); k++; sayFileName(f,bw); k--; } else { bw.write(getStr(k)+"|--"+f.getName()+"\r\n"); } } } public static void main(String[] args) throws Exception { String s=new File("Dir.class").getAbsolutePath(); s=s.substring(0,s.lastIndexOf("\\")); long l=System.currentTimeMillis(); File file=new File(s); BufferedWriter bw=new BufferedWriter(new FileWriter(new File(s+"\\dir.txt"))); new Dir().sayFileName(file,bw); bw.flush(); bw.close(); System.out.println("success-->"+(System.currentTimeMillis()-l)+"ms"); } }