字節(jié)流和字符流的操用到的編碼表和默認(rèn)緩沖區(qū)大小。如果要自己指定這些值，需要構(gòu)造兩個方法。
想要實現(xiàn)字符流和字節(jié)流之間的相互轉(zhuǎn)換需要用到兩個類：
OutputStreamWriter 是字符流通向字節(jié)流的橋梁
InputStreamReader 是字節(jié)流通向字符流的橋梁
先看示例：

package com.zhaoqian.transstream;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStreamWriter;

public class Demo1 {

    public static void main(String[] args) throws IOException {
        File f = new File("F:"+File.separator+"Demo"+File.separator+"test.txt");
        
        // OutputStreamWriter 是字符流通向字節(jié)流的橋梁,創(chuàng)建了一個字符流通向字節(jié)流的對象
        OutputStreamWriter osw = new OutputStreamWriter(new FileOutputStream(f),"UTF-8");
        
        osw.write("我是字符流轉(zhuǎn)換成字節(jié)流輸出的");
        osw.close();

    }

}

字節(jié)流轉(zhuǎn)換成字符流，編碼格式為UTF-8

package com.zhaoqian.transstream;

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStreamReader;


public class Demo2 {

    public static void main(String[] args) throws IOException {
        
        File f = new File("F:"+File.separator+"Demo"+File.separator+"test.txt");
        
        InputStreamReader inr = new InputStreamReader(new FileInputStream(f),"UTF-8");
        
        char[] buf = new char[1024];
        
        int len = inr.read(buf);
        System.out.println(new String(buf,0,len));
        
        inr.close();

    }

}

獲取鍵盤錄入并存儲

package com.zhaoqian.transstream;

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.FileWriter;
import java.io.IOException;
import java.io.InputStreamReader;

public class Demo3 {

    // 鍵盤錄入，存儲在文件中
    public static void main(String[] args) throws IOException {
        
        // 將字節(jié)流轉(zhuǎn)換成字符流，并使用字符緩沖區(qū)獲取鍵盤錄入
        BufferedReader  bur = new BufferedReader(new InputStreamReader(System.in));
        
        // 目的文件
        FileWriter fw = new FileWriter("F:\\Demo\\test.txt");
        
        // 字符緩沖區(qū)，輸出數(shù)據(jù)
        BufferedWriter bw = new BufferedWriter(fw);
        
        String line = null;
        while((line=bur.readLine())!=null){
            if ("over".equals(line)) {
                break;
            }
            bw.write(line);
            bw.newLine();
            bw.flush();
        }
        bw.close();
        bur.close();
        
    }

}