JAVA--IO(后)

字符流：
     字符输入流
         Reader
     字符输出流
         Writer


Writer
     OutputStreamWriter: 字符输出流 是以字节流加上编码表得到的一个转换流，后期写数据的时候可以根据自己指定的编码进行写入
     public OutputStreamWriter(OutputStream out)
     创建一个使用默认字符编码的OutputStreamWriter。根据默认的编码用字符作为桥梁将字节流的数据转换为字符流
     public OutputStreamWriter(OutputStream out,String charsetName)
     根据指定的编码用字符作为桥梁将字节流的数据转换为字符流

     把字节流转化字符流

     字符流 = 字节流 + 编码表

public class OutputStreamWriterDemo1 {
    public static void main(String[] args) throws Exception {
        //1、创建字符输出流对象
//        OutputStreamWriter osw = new OutputStreamWriter(new FileOutputStream("aaa.txt"));
//        OutputStreamWriter osw = new OutputStreamWriter(new FileOutputStream("bbb.txt"),"GBK");
        OutputStreamWriter osw = new OutputStreamWriter(new FileOutputStream("ccc.txt"),"GBK");

        osw.write("中国");

        //释放资源
        osw.close();


    }
}

Reader
    InputStreamReader: 字符输入流
    public InputStreamReader(InputStream in)
    读取数据，根据默认的编码用字符作为桥梁将字节流的数据转换为字符流
    public InputStreamReader(InputStream in,String charsetName)
    读取数据，根据指定的编码用字符作为桥梁将字节流的数据转换为字符流

public class InputStreamReaderDemo1 {
    public static void main(String[] args) throws Exception {
//        InputStreamReader isr = new InputStreamReader(new FileInputStream("bbb.txt"));
        InputStreamReader isr = new InputStreamReader(new FileInputStream("ccc.txt"),"GBK");

        //一次读取一个字符
        int c = 0;
        while ((c=isr.read())!=-1){
            System.out.print((char) c);
        }

        //释放资源
        isr.close();

    }
}