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));//創(chuàng)建字符處理流對(duì)象
             String s = bufferedReader.readLine();//讀取文件
             System.out.println(s);
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } finally {//關(guān)閉處理流
            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);
        //將字節(jié)輸入流，轉(zhuǎn)換為字符流 并指定編碼格式為 utf8
        InputStreamReader inputStreamReader = new InputStreamReader(fileInputStream, "gbk");
         //將字符流轉(zhuǎn)換為功能更加強(qiáng)大的字符處理流
        BufferedReader bufferedReader = new BufferedReader(inputStreamReader);
         //讀取內(nèi)容
        String s = bufferedReader.readLine();
        System.out.println(s);
         //關(guān)閉流
        bufferedReader.close();
    }
}
 

import java.io.*;
 public class OutputSteamWriterTest {
    public static void main(String[] args) throws IOException {
        String filePath = "e:\\Java\\hello.txt";
         //將字節(jié)輸出流轉(zhuǎn)換為字符輸出流
        OutputStreamWriter outputStreamWriter = new OutputStreamWriter(new FileOutputStream(filePath), "gbk");
         String content = "你好，Java！";
         //將內(nèi)容寫進(jìn)文件
        outputStreamWriter.write(content);
         //關(guān)閉流
        outputStreamWriter.close();
         System.out.println("保存成功~~~");
    }
}