Java basic IO file copy exercises

/**
* Write a program that copies all of the. java files in the specified directory to another directory, and when the copy succeeds, change the suffix. java to. txt.
*/

1. We can see the problem or use the idea of small to do
Analysis: 1. Copy >>> Choose what stream?? >>> copy I wrote in the previous blog, we use the word stream, character stream read Only write
2.java End >> We can think of the EndsWith () method in string.
3. Copy successful and then change the suffix name >>file a method of Renameto ()
4. What if a file with the same name in the folder of the copied file is received?? Think about this.

We look at the code: the first step: 1. Copy >>> Choose what stream?? >>> copy I wrote in the previous blog, we use the word stream, character stream read Only write
2.java End >> We can think of the EndsWith () method in string.

/** Copy of File*/    Private Static voidCopy (file src, file dest)throwsIOException {file[] files=Src.listfiles (); //determine if the array is empty        if(Files! =NULL) {            //iterating through an array             for(File file:files) {//Files that are files and end in Java                if(File.isfile () && file.getname (). EndsWith (". Java")) {                    //Fast buffer stream copy speedBufferedinputstream bis =NewBufferedinputstream (Newfileinputstream (file)); Bufferedoutputstream Bos=NewBufferedoutputstream (NewFileOutputStream (NewFile (dest, File.getname ())); byte[] by =New byte[1024]; intLen = 0;  while(len = Bis.read (by))! =-1) {Bos.write (by,0, Len); }                    //off-StreamBos.close ();                    Bis.close (); //if the file}Else if(File.isdirectory ()) {//in determining whether this folder is empty or without Java files, we don't copy the definition remove ()                    if(remove (file)) {file NewFile=NewFile (dest, File.getname ());                        Newfile.mkdirs ();                    Copy (file, newfile); }                }            }        }    }    Private Static BooleanRemove (file file) {file[] files=File.listfiles (); //determine if the array is empty        if(File! =NULL) {             for(File file2:files) {//is a file and the file ending in Java returns true                if(File2.isfile () && file2.getname (). EndsWith (". Java")) {                    return true; //This is the key, not the file, but also the file to contain the Java file}Else if(File2.isdirectory () &&Remove (file2)) {                    return true; }            }        }        //condition does not match return false        return false; }}

The second step: 3. Copy successful and then change suffix name >>file a method of Renameto () with a suffix name
4. What if a file with the same name in the folder of the copied file is received?? Think about this.

    //. Java modified to. txt    Private Static voidRevamp (File dest)throwsioexception{file[] File=Dest.listfiles ();  for(File file2:file) {if(File2.isfile ()) {//Gets the file name stringString SB =File2.getname (); //determine if it is a Java file                if(Sb.endswith (". Java") {StringBuilder sb1=NewStringBuilder (SB); //Replace the Java string with a. txt stringSb1.replace (Sb1.tostring (). IndexOf (". Java"), Sb1.length (), ". txt"); //New FileFile NewFile =NewFile (dest, sb1.tostring ()); //one more time. Loop through the files and folders in this number of times Group                     for(File file3:file) {//If you have the same file in it, delete it in the rename                        if(File3.isfile () &&newfile.getname (). Equals (File3.getname ()))                        {File3.delete (); }                    }                    //determine if there is a duplicate name in the folderFile2.renameto (NewFile); }                //if it's a file, it's recursive .}Else if(File2.isdirectory ()) {revamp (file2); }        }    }

Main method

 Public Static void throws IOException {        // package file address        new file ("E:\\io stream");         New File ("E:\\io");         // Copy         Copy (SRC, dest);         //  Renaming         revamp (dest);    }

Java basic IO file copy exercises