The Java implementation reads the file names of all files under the folder including subdirectories

In the process of programming, often used to the file read and write operations. For example, find all the file names under a certain folder.

The following program provides the procedure to obtain the absolute path of all files in a given folder. Can be a certain module, when the need for direct use.

package src;

import java.io.BufferedWriter;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStreamWriter;
import java.util.Vector;

public class FileList {
  private String dir_name=null;
  private String list_name=null;
  private BufferedWriter out = null;
  Vector<String> ver=null;
  
  public FileList(String dir_name,String list_name) throws IOException{
    this.dir_name=dir_name;  //Folder address
    this.list_name=list_name;  //Save the file address of the file list
    ver=new Vector<String>();  //Used as a stack
  }

  public void getList() throws Exception{
    out = new BufferedWriter(new OutputStreamWriter(new FileOutputStream(list_name, true)));  //Writes to the specified file as an append
    ver.add(dir_name);
    while(ver.size()>0){
      File[] files = new File(ver.get(0).toString()).listFiles();  //Gets all the file (folder) names under this folder
      ver.remove(0);
      
      int len=files.length;
      for(int i=0;i<len;i++){
        String tmp=files[i].getAbsolutePath();
        if(files[i].isDirectory())  //If it is a directory, join the queue. For subsequent processing
          ver.add(tmp);
        else          
          out.write(tmp+"rn");    //If it is a file, output the file name directly to the specified file.
      }
    }
    out.close();
  }
}