java中关于文本文件的读写方法实例总结

2019-11-26 14:53:05

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本文实例总结了java中关于文本文件的读写方法。分享给大家供大家参考，具体如下：

写文本数据

方法一：

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());    }  }}

方法二：

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("qunqu n ");      pw.println("feiefi ss");      pw.print("qunqu n ");      pw.close();      fw.close();    } catch (IOException e) {      System.out.println(e.toString());    }  }}

方法三：

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

附注：方法一和方法二，方法三都是在操作文本文件不存在的时候将创建，否则，当覆盖之！

另；方法三

BufferedWriter将文本写入字符输出流，缓冲各个字符，从而提供单个字符、数组和字符串的高效写入。

附：追加写入：

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

读文本数据

方法一：

import java.io.*;public class A {  public static void main(String args[]) {    try {      FileInputStream fstream = new FileInputStream("a.txt");      DataInputStream in = 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());    }  }}

方法二：

import java.io.*;public class B {  public static void main(String args[]) {    try {      FileReader fr = new FileReader("a.txt");      BufferedReader br = new BufferedReader(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());    }  }}

附：方法二的能够高效的实现文本数据的读出

希望本文所述对大家Java程序设计有所帮助。

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