文件读写1

xiaoxiao2021-03-25 169

import java.io.BufferedReader; import java.io.BufferedWriter; import java.io.File; import java.io.FileInputStream; import java.io.FileNotFoundException; import java.io.FileOutputStream; import java.io.IOException; import java.io.InputStreamReader; import java.io.OutputStreamWriter; import java.io.UnsupportedEncodingException; public class Filedemo { public static void main(String[] args) { File file = new File("test.txt"); //文件存在 if (file.exists()) {

try {

//读取文件数据到缓冲区

FileInputStream fis = new FileInputStream(file); InputStreamReader isr = new InputStreamReader(fis); BufferedReader br = new BufferedReader(isr);

//写入新文件

File newfile = new File("newtest.txt"); FileOutputStream fos = new FileOutputStream(newfile); OutputStreamWriter osw = new OutputStreamWriter(fos); BufferedWriter bw = new BufferedWriter(osw); String line; while ((line = br.readLine()) != null) { bw.write(line); bw.newLine();//分行 } bw.close(); osw.close(); fos.close(); br.close(); isr.close(); fis.close(); } catch (FileNotFoundException e) { e.printStackTrace(); } catch (UnsupportedEncodingException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } } System.err.println("exists"); } }

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