java中关于文本文件的读写方法实例总结

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。