Java IO InputStreamReader和OutputStreamWriter

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InputStreamReader和OutputStreamWriter 是字节流通向字符流的桥梁：它使用指定的 charset 读写字节并将其解码为字符。
InputStreamReader 的作用是将“字节输入流”转换成“字符输入流”。它继承于Reader。
OutputStreamWriter 的作用是将“字符输出流”转换成“字节输出流”。它继承于Writer。

package com.louisgeek.appupdatetool;import java.io.File;import java.io.FileInputStream;import java.io.FileOutputStream;import java.io.IOException;import java.io.InputStreamReader;import java.io.OutputStreamWriter;import java.io.Reader;import java.io.Writer;/** * 转换流 * Created by louisgeek on 2016/8/22. */public class CharStreamAndByteStreamTest {    public static void main(String[] args) throws Exception{        //outputStreamWriter();        inputStreamReader();    }    private static void outputStreamWriter() throws IOException {        File file=new File("d:"+File.separator+"text.txt");        Writer writer=new OutputStreamWriter(new FileOutputStream(file));        writer.write("hello android");        writer.close();    }    private static void inputStreamReader() throws IOException {        File file=new File("d:"+File.separator+"text.txt");        Reader reader=new InputStreamReader(new FileInputStream(file));        char[] charArr=new char[1024];        int len=reader.read(charArr);        System.out.println(new String(charArr,0,len));        reader.close();    }}

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