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。