java 使用带有缓冲的字符流读写数据

谁借莪１个温暖的怀抱￠ 2022-06-15 08:40 153阅读 0赞

案例

import java.io.BufferedOutputStream;  
import java.io.BufferedReader;  
import java.io.BufferedWriter;  
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.PrintWriter;  
import java.io.UnsupportedEncodingException;  
public class RWByBufferCharStream \{

public static void main(String\[\] args) \{  
/\*  
\* 数据的读 出  
\*/  
  
//File file = new File("1.txt");  
  
try \{  
//传入一个文件字符流输入流  
FileInputStream fileInputStream = new FileInputStream("1.txt");  
//将字符流转化为字节流  
FileOutputStream fileOutputStream = new FileOutputStream("i\_newbuffer.txt");  
InputStreamReader inputStreamReader = new InputStreamReader(fileInputStream,"UTF-8");  
OutputStreamWriter outputStreamWriter = new OutputStreamWriter(fileOutputStream, "UTF-8");  
BufferedReader bufferedReader = new BufferedReader(inputStreamReader);  
//BufferedWriter bufferedWriter = new BufferedWriter(outputStreamWriter);  
PrintWriter printWriter = new PrintWriter( outputStreamWriter,true);//使用这个类会有换行符出现  
  
String input;  
while((input=bufferedReader.readLine())!=null)//读取文件的一行数据  
\{  
//bufferedWriter.write(input);// BufferedWriter bufferedWriter自带有缓冲区 只有当缓冲区写满后才写入硬盘这样 可以提高硬盘使用量，硬盘的寿命 整体写出时间变短  
printWriter.println(input);//输出有换行符的字符串  
\}  
//读取一段缓存流后需要 写入到文件中  
//为了 保证缓冲区所有文件都输出 需要强制输出 printWriter.flush();  
printWriter.flush();  
printWriter.close();  
bufferedReader.close();  
  
outputStreamWriter.close();  
inputStreamReader.close();  
fileOutputStream.close();  
fileInputStream.close();  
System.out.println("文件拷贝完成");  
  
\} catch (FileNotFoundException e) \{  
  
e.printStackTrace();  
\} catch (UnsupportedEncodingException e) \{  
// TODO Auto-generated catch block  
e.printStackTrace();  
\} catch (IOException e) \{  
// TODO Auto-generated catch block  
e.printStackTrace();  
\}  
\}

结果 如下：

文件拷贝完成