IO Lab 2

Last week we looked at how to manipulate files using a bunch of classes in Java.nio.file.  This week we will learn how to read and write text files using classes in Java.nio.file package.

1. Create a directory called “files” in the root folder of the project.
2. Create a text file called “source.txt” in the files folder.
3. Create two Path object to hold the source path (“files/source.txt”) and the target path (“files/target.txt”)
4. Create a Charset object as shown below:

Charset charset = Charset.forName(“US-ASCII”);

5. Within a try-with-resources block, create a BufferedReader object using the newBufferedReader method of the Files class passing source path and charset as parameters.
6. In the try-with-resources block that you created before, add a BufferedWriter object using  Files.newBufferedWriter method passing target path and charset as parameter.
7. Read using the BufferedReader’s readLine method and write to target path using BufferedWriter’s  append method.
8. Create two new directories in files directory called “backup” and “work”.
9. Copy the “source.txt” and “target.txt”  to backup folder as “sourceBk.txt” and “targetBk.txt”
10. Then, move the “source.txt” and “target.txt” to “files/work” folder.
11. Create a path for the “files” directory that you created in root directory of the project.
12. Create a class called FileLister that extends SimpleFileVisitor class. Change the generic data type to Path.
13. Override all the methods in the SimpleFileVisitor class to create the following output to the console when you call Files.walkFileTree() passing directory path and an instance of FileLister.

files      <dir>                         backup <dir>                                     sourceBk.txt                                     targetBk.txt                         work    <dir>                                     source.txt                                     Target.txt

14. Create a class called FileSearcher that extends SimpleFileVisitor class. Change the generic data type to Path.
15. Create a variable called matcher of type PathMatcher
16. Create a constructor for FileSearcher class that accepts a string parameter.

   public FileSearcher(String pattern) {
        matcher = FileSystems.getDefault().getPathMatcher("glob:" + pattern);
   }

17. Override visitFile method of the SimpleFileVisitor. Use matcher.matches() to check if the file being visited matches the pattern. If there is a match then add the path to an ArrayList.
18. Add a getter method for the arrayList called getMatchFound();
19. In the main method create an instance of  FileSearcher, pass a pattern (for example: “*.txt”) through the constructor. Walk the file tree.
20. List the matches found to the console.

files      <dir>                         backup <dir>                                     sourceBk.txt                                     targetBk.txt                         work    <dir>                                     source.txt                                     target.txt Following matches were found: files\backup\sourceBk.txt files\backup\targetBk.txt files\work\source.txt files\work\target.txt

21. Submit a screenshot of the entire source code and the output.