Summary of examples of reading and writing methods of text files in Java

This article summarizes the reading and writing methods of text files in Java. Share it for your reference, as follows:

Write text data

Method 1:

 import java.io.*;public class A { public static void main(String args[]) { FileOutputStream out; PrintStream ps; try { out = new FileOutputStream("a. txt"); ps = new PrintStream(out); ps.println("qun qun."); ps.println("fei fei"); ps.close(); } catch (Exception e) { System.out.println(e.toString()); } }}

Method 2:

 import java.io.*;public class B { public static void main(String args[]) { FileWriter fw; PrintWriter pw; try { fw = new FileWriter("b.txt"); pw = new PrintWriter(fw); pw.print("qunqun "); pw.println("feifi ss"); pw.print("qunqun "); pw.close(); fw.close(); } catch (IOException e) { System .out.println(e.toString()); } }}

Method 3:

 import java.io.*;public class C { public static void main(String args[]) { String str_writen = "This is a simple example"; try { FileWriter fwriter = new FileWriter("c.txt"); BufferedWriter bfwriter = new BufferedWriter(fwriter); bfwriter.write(str_writeten, 0, str_writeten.length()); bfwriter.flush(); bfwriter.close(); } catch (IOExcept ion e) { System.out.println(e.toString ()); } }}

Note: Method 1 and Method 2 and Method 3 are created when the operation text file does not exist, otherwise, it will be overwritten!

Another; Method 3

BufferedWriter writes text to a character output stream, buffering individual characters, thereby providing efficient writing of individual characters, arrays, and strings.

Attachment: Append write:

 import java.io.*;public class C { public static void main(String args[]) { String str_writen = "This is a simple example"; try { FileWriter fwriter = new FileWriter("c.txt", true); BufferedWriter bfwriter = new BufferedWriter(fwriter); bfwriter.newLine(); bfwriter.write(str_writeten, 0, str_writeten.length()); bfwriter.flus h(); bfwriter.close(); } catch (IOException e) { System .out.println(e.toString()); } }}

Read text data

Method 1:

 import java.io.*;public class A { public static void main(String args[]) { try { FileInputStream fstream = new FileInputStream("a.txt"); DataInputStream i n = new DataInputStream(fstream); while (in. available() != 0) { String a = in.readLine(); System.out.println(a); System.out.println(a.length()); } in.close(); } catch (Exception e) { System.out.println(e.toString()); } }}

Method 2:

 import java.io.*;public class B { public static void main(String args[]) { try { FileReader fr = new FileReader("a.txt"); BufferedReader br = new Buf feredReader(fr); String str; int count = 0; while ((str = br.readLine()) != null) { count++; System.out.println(count + " : " + str); } br.close(); fr.close(); } catch (Exception e) { System.out.println(e.toString()); } }}

Appendix: Method 2 can efficiently realize the reading of text data

I hope this article will be helpful to everyone's Java programming.