IO流 p9 转换流-InputStreamReader 和 OutputStreamWriter
转换流-InputStreamReader 和 OutputStreamWriter
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介绍
- InputStreamReader:Reader的子类,可以将InputStream(字节流)包装成Reader(字符流);
- OutputStreamWriter:Writer的子类,实现将OutputStream(字节流)包装成Writer(字符流);
- 当处理纯文本数据时,如果使用字符流效率更高,并且可以有效解决中文问题,所以建议将字节流转换成字符流;
- 可以在使用时指定编码格式(比如 utf-8,gbk,gb2312,ISO8859-1等),解决乱码问题;
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InputStreamReader
代码演示:
import java.io.*; /** * @author: 86199 * @date: 2023/5/7 17:18 * @description: 演示使用 InputStreamReader 转换流解决中文乱码问题 * 将字节流 FileInputStream 转换成字符流 InputStreamReader,指定编码 gbk/utf-8 */ public class InputStreamReader_ { public static void main(String[] args) throws IOException { String filePath = "e:\\a.txt"; BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(new FileInputStream(filePath), "gbk")); //读取 String s = bufferedReader.readLine(); System.out.println("读取内容 = " + s); //关闭流 bufferedReader.close(); } }
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OutputStreamWriter
代码演示:
package com.hsp.transformation; import java.io.*; /** * @author: 86199 * @date: 2023/5/7 17:31 * @description: 演示 OutputStreamWriter 使用,把FileOutputStream 字节流,转成OutputStreamWriter * 指定处理的编码 gbk/utf-8/utf8 */ public class OutputStreamWriter_ { public static void main(String[] args) throws IOException { String filePath = "e:\\test.txt"; String charSet = "utf8"; OutputStreamWriter outputStreamWriter = new OutputStreamWriter(new FileOutputStream(filePath), charSet); outputStreamWriter.write("只因你太美"); outputStreamWriter.close(); System.out.println("文件按照" + charSet + "保存成功"); } }
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