一起来学习Java IO的转化流

import java.io.BufferedReader;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
 public class TestDemo {
    public static void main(String[] args) {
        BufferedReader bufferedReader = null;
        String filePath = "e:\\Java\\Java.txt";
        try {
            bufferedReader = new BufferedReader(new FileReader(filePath));//创建字符处理流对象
             String s = bufferedReader.readLine();//读取文件
             System.out.println(s);
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } finally {//关闭处理流
            try {
                if (bufferedReader != null) {
                    bufferedReader.close();
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }
}

import java.io.*;
 public class InputStreamReaderTest {
    public static void main(String[] args) throws IOException {
        String filePath = "e:\\Java\\Java.txt";
         FileInputStream fileInputStream = new FileInputStream(filePath);
        //将字节输入流，转换为字符流 并指定编码格式为 utf8
        InputStreamReader inputStreamReader = new InputStreamReader(fileInputStream, "gbk");
         //将字符流转换为功能更加强大的字符处理流
        BufferedReader bufferedReader = new BufferedReader(inputStreamReader);
         //读取内容
        String s = bufferedReader.readLine();
        System.out.println(s);
         //关闭流
        bufferedReader.close();
    }
}
 

import java.io.*;
 public class OutputSteamWriterTest {
    public static void main(String[] args) throws IOException {
        String filePath = "e:\\Java\\hello.txt";
         //将字节输出流转换为字符输出流
        OutputStreamWriter outputStreamWriter = new OutputStreamWriter(new FileOutputStream(filePath), "gbk");
         String content = "你好，Java！";
         //将内容写进文件
        outputStreamWriter.write(content);
         //关闭流
        outputStreamWriter.close();
         System.out.println("保存成功~~~");
    }
}