java中关于文本文件的读写方法实例总结

前端技术 2023/09/02 Java

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。

本文地址:https://www.stayed.cn/item/5586

转载请注明出处。

本站部分内容来源于网络,如侵犯到您的权益,请 联系我

我的博客

人生若只如初见,何事秋风悲画扇。