How to read txt in java

TXT is a text file, which is generally read as a stream:

Java provides a FileInputStream. We can construct this stream directly with the file path, or we can Construct it as a file object. For example:

FileInputStream fin = new FileInputStream("d:/aa.txt");

Then you can use this stream to read the file directly, but the content read at this time is an int type value, so further processing is required. We wrap the fin with an InputStreamReader , it becomes like this:

InputStreamReader reader = new InputStreamReader(fin);

But it is not very convenient for this reader to read text. One thing to note is that the character encoding can be set in the construction method of this reader; next, use this The reader constructs a BufferedReader. BufferedReader has a method named readLine, which can read an entire line of text and return it as a string, so it is more convenient to use.

BufferedReader buffReader = new BufferedReader(reader);

The next step is to use a loop to read the string in the file, and then do what you want to do.

import java.io*;
public class MainStart{
    public static void main(String args[]){
        String filePath = "D:/aa.txt";
        FileInputStream fin = new FileInputStream(filePath);
        InputStreamReader reader = new InputStreamReader(fin);
        BufferedReader buffReader = new BufferedReader(reader);
        String strTmp = "";
        while((strTmp = buffReader.readLine())!=null){
            System.out.println(strTmp);
        }
        buffReader.close();
    }
}

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