java中關於文本文件的讀寫辦法實例總結

java中關於文本文件的讀寫辦法實例總結。本站提示廣大學習愛好者：（java中關於文本文件的讀寫辦法實例總結）文章只能為提供參考，不一定能成為您想要的結果。以下是java中關於文本文件的讀寫辦法實例總結正文

本文實例總結了java中關於文本文件的讀寫辦法。分享給年夜家供年夜家參考，詳細以下：

寫文本數據

辦法 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());
    }
  }
}

辦法 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());
    }
  }
}

辦法三：

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：辦法一和辦法二，辦法三都是在操作文本文件不存在的時刻將創立，不然，當籠罩之！

另；辦法三

BufferedWriter將文本寫入字符輸入流，緩沖各個字符，從而供給單個字符、數組和字符串的高效寫入。

附：追加寫入：

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());
    }
  }
}

讀文本數據

辦法一：

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());
    }
  }
}

辦法二：

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：辦法二的可以或許高效的完成文本數據的讀出

願望本文所述對年夜家Java法式設計有所贊助。