package day170903; 
import java.io.*; 
public class TestDecoder {
	public static void main(String[] args) {
		FileReader fr = null;
		try {
			fr = new FileReader("G:/io/hello.txt");
			int len = 0;
			while((len=fr.read())!=-1) {
				System.out.println((char)len);
			}
		} catch (FileNotFoundException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		} finally {
			try {
				if(fr!=null) {
					fr.close();
				}
			} catch (IOException e) {
				e.printStackTrace();
			}
		}
	}
}

/**
 * Convenience class for reading character files.  The constructors of this
 * class assume that the default character encoding and the default byte-buffer
 * size are appropriate.  To specify these values yourself, construct an
 * InputStreamReader on a FileInputStream.
 *
 *這是一個(gè)很方便的讀取字符文件（文本文件）的類。
 *這個(gè)類的構(gòu)造方法假設(shè)默認(rèn)的字符編碼和默認(rèn)的緩存數(shù)組大小是合適的（滿足需要的）。
 *假如你想自己指定字符編碼和緩存數(shù)組的大小，
 *請(qǐng)使用基于FileInputStream的InputStreamReader類。
 * <p><code>FileReader</code> is meant for reading streams of characters.
 * For reading streams of raw bytes, consider using a
 * <code>FileInputStream</code>.
 *
 *FileReader是設(shè)計(jì)為用來(lái)讀取字符流的。
 *想要讀取原始的字節(jié)流的話，可以考慮使用FileInputStream
 * @see InputStreamReader
 * @see FileInputStream
 *
 * @author      Mark Reinhold
 * @since       JDK1.1
 */

    public FileReader(String fileName) throws FileNotFoundException {
        super(new FileInputStream(fileName));
    }

    public InputStreamReader(InputStream in) {
        super(in);
        try {
            sd = StreamDecoder.forInputStreamReader(in, this, (String)null); // ## check lock object
        } catch (UnsupportedEncodingException e) {
            // The default encoding should always be available
            throw new Error(e);
        }
    }

    protected Reader(Object lock) {
        if (lock == null) {
            throw new NullPointerException();
        }
        this.lock = lock;
    }

sd = StreamDecoder.forInputStreamReader(in, this, (String)null);

public static StreamDecoder forInputStreamReader(InputStream in,
                                                 Object lock,
                                                 String charsetName)
    throws UnsupportedEncodingException
{
    String csn = charsetName;
    if (csn == null)
        csn = Charset.defaultCharset().name();
    try {
        if (Charset.isSupported(csn))
            return new StreamDecoder(in, lock, Charset.forName(csn));
    } catch (IllegalCharsetNameException x) { }
    throw new UnsupportedEncodingException (csn);
}

public static Charset defaultCharset() {
    if (defaultCharset == null) {
        synchronized (Charset.class) {
            String csn = AccessController.doPrivileged(
                new GetPropertyAction("file.encoding"));
            Charset cs = lookup(csn);
            if (cs != null)
                defaultCharset = cs;
            else
                defaultCharset = forName("UTF-8");
        }
    }
    return defaultCharset;
}

package day170903; 
import java.io.*; 
public class TestDefaultCharEncoding {
	public static void main(String[] args) {
		InputStreamReader isr = null;
		OutputStreamWriter osw = null;
		try {
			osw = new OutputStreamWriter(new FileOutputStream("G:/io/ISO-8859-1.txt"),"ISO-8859-1");
			isr = new InputStreamReader(new FileInputStream("G:/io/ISO-8859-1.txt"));
			char[] chars = "Est-ce possible que tu sois en train de penser à moi lorsque tu me manques?".toCharArray();
			osw.write(chars);
			osw.flush();
			int len = 0;
			while((len=isr.read())!=-1) {
				System.out.print((char)len);
			}
		} catch (UnsupportedEncodingException | FileNotFoundException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		} finally {
			try {
				if(isr!=null) {
					isr.close();
				}
				if(osw!=null) {
					osw.close();
				}
			} catch (IOException e) {
				e.printStackTrace();
			}
		}
	}
}

public static List<String> getLines( String fileName )  
{  
    List<String> lines = new ArrayList<String>();  
    try  
    {  
        BufferedReader br = new BufferedReader(new FileReader(fileName));  
        String line = null;  
        while( ( line = br.readLine() ) != null )  
            lines.add(new String(line.getBytes("GBK"), "UTF-8"));  
        br.close();  
    }  
    catch( FileNotFoundException e )  
    {  
    }  
    catch( IOException e )  
    {  
    }  
    return lines;  
}  

public static List<String> getLines( String fileName )  
{  
    List<String> lines = new ArrayList<String>();  
    try  
    {  
        BufferedReader br = new BufferedReader(new InputStreamReader(new FileInputStream(fileName), "UTF-8"));  
        String line = null;  
        while( ( line = br.readLine() ) != null )  
            lines.add(line);  
        br.close();  
    }  
    catch( FileNotFoundException e )  
    {  
    }  
    catch( IOException e )  
    {  
    }  
    return lines;  
}