java中文件读和写的操作_java文件的读与写-优快云博客

本文提供了一个使用Java进行文件读写的简单示例。通过两个类`FileReadTest`和`FileWriteTest`展示了如何从文件中读取数据并打印到控制台，以及如何将字符串写入文件。

import java.io.*; //文件读 class FileReadTest { public static void main (String[] args) { FileReadTest t = new FileReadTest(); t.readMyFile(); } void readMyFile() { String record = null; int recCount = 0; try { FileReader fr = new FileReader("mydata.txt"); BufferedReader br = new BufferedReader(fr); record = new String(); while ((record = br.readLine()) != null) { recCount++; System.out.println(recCount + ": " + record); } br.close(); fr.close(); } catch (IOException e) { System.out.println("Uh oh, got an IOException error!"); e.printStackTrace(); } } }

/////////////////////////////////////////////////////文件写 import java.io.*; class FileWriteTest { public static void main (String[] args) { FileWriteTest t = new FileWriteTest(); t.WriteMyFile(); } void WriteMyFile() { try { FileWriter fw = new FileWriter("mydata.txt"); PrintWriter out = new PrintWriter(fw); out.print(“hi,this will be wirte into the file!”); out.close(); fw.close(); } catch (IOException e) { System.out.println("Uh oh, got an IOException error!"); e.printStackTrace(); } } }