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】