All hierarchy files are included in the recursive folder with multiple keywords, and then the files are copied

package demo;import java.io.bufferedreader;import java.io.file;import  Java.io.fileinputstream;import java.io.filenotfoundexception;import java.io.fileoutputstream;import  java.io.IOException;import java.io.InputStreamReader;import java.nio.channels.FileChannel; import java.text.parseexception;import java.text.simpledateformat;import java.util.arraylist; import java.util.calendar;import java.util.date;public class demo {private  static string str =  "";p rivate static arraylist<string> filelist  = new ArrayList<String> ();p Ublic static void main (String[] args)  {string[] s = {"Years", "Friends", "Youth"};     getfiles ("E://duzhe", s);} By recursively getting all directories and their files under a certain path Public static void getfiles (string filepath,string[] s) {file  root = new file (FilePath);  &nbsP;  file[] files = root.listfiles ();     for (File file:files) {         if (File.isdirectory ()) {    // System.out.println ("[Folder]" +file.getabsolutepath ());     getfiles (File.getabsolutepath (), s);     }else{    system.out.println ("[File]" +file.getabsolutepath ());     //character Matching     if (File.length ()  < 1024*1024*2 &&  file.getname (). EndsWith (". txt")) {    str = readtxt (file);     if (Containstr (str,s)  >=3) {    system.out.println ("[" + File.getabsolutepath () + "]");     copys (file);    }     }    }         }}public static  int containstr (string str,string[] s] {        int ts= 0;         for (int i = 0; i < s.length; i++)  {             if  (Str.contains (s[i))  {                 ts++;                 //system.out.println ("string" +s[i]+ "In" + "specify string str!");             }         }        return ts;    }public  static string readtxt (file file) { string str =  "";  try {             string encoding= "GBK";    &Nbsp;        if (File.isfile ()  && file.exists ()) {  //determine if a file exists                  inputstreamreader read = new inputstreamreader (New fileinputstream (file), encoding);//considering the encoding format                  bufferedreader bufferedreader = new bufferedreader (Read);                 String lineTxt = null;                 while ((lineTxt  = bufferedreader.readline ())  != null) {                     //system.out.println (LINETXT);                     str += linetxt;                 }                 read.close ();         }else{            &NBSP;SYSTEM.OUT.PRINTLN ("The specified file cannot be found");        }         } catch  (exception e)  {        &NBSP;&NBSP;&NBSP;&NBSP;&NBSP;SYSTEM.OUT.PRINTLN ("Error reading file contents");             e.printstacktrace ();         } return  str;    }//Copy File Public static void copys (File f) {try {      &nBsp;        filechannel in = new fileinputstream (f ). Getchannel (),  out = new fileoutputstream ("e:\\fly\\" +f.getname ()). GetChannel ();               in.transferto (0, in.size (),  out);//simplified notation                Out.transferfrom (In, 0, in.size ());//Effect ditto            } catch  (filenotfoundexception e)  {         &NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;SYSTEM.OUT.PRINTLN ("File not Found");           } catch  (ioexception e)  {               e.printstacktrace ();           }  }}

All hierarchy files are included in the recursive folder with multiple keywords, and then the files are copied