JavaSE 高级 第12节 字符输入流InputStreamReader

2016-07-24

Reader

1，InputStreamReader   字节流通向字符流的桥梁

FileInputStream fis=null;

InputStreamReader isr=null;

fis=new FileInputStream( "C:\Users\admin\Desktop\in.txt");

isr=new InputStreamReader(fis,"UTF-8");

package com.java1995;

public class Test {

    public static void main(String[] args) {
        System.out.println(System.getProperty("file.encoding"));

        System.out.println("大家好".getBytes().length);
    }
}

package com.java1995;

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

public abstract class TestInputStreamReader {

    public static void main(String[] args) {
        FileInputStream fis = null;
        InputStreamReader isr = null;

        try {
            fis = new FileInputStream("D:\workspace\java_io\in.txt");
            isr = new InputStreamReader(fis, "UTF-8");

            int c = 0;
            fis.read();// 每次读取一个字节
            c = isr.read();// 每次读取的字节是根据编码集决定的
            while (c != -1) {
                System.out.print((char) c);
                c = isr.read();
            }
        } catch (FileNotFoundException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } finally {
            // 关闭流
            // 先关闭fis，然后关闭isr
        }
    }
}

【参考资料】

[1] Java轻松入门经典教程【完整版】