1.字符輸入流

1.java.io.Reader:字符輸入流,抽象類
    具體的子類:字節(jié)輸入流通向字符輸入流的橋梁:InputStreamReader
2.字符緩沖輸入流:
	構(gòu)造方法:
		public InputStreamReader(InputStream in):使用默認(rèn)字符集進(jìn)行解碼
        public InputStreamReader(InputStream in,String charsetName)throws UnsupportedEncodingException:使用指定的字符集解碼
    讀的方式:
		public int read() throws IOException:一次讀取一個字符
        public int read(char[] cbuf)throws IOException:一次讀取一個字符數(shù)組
3.public class ReaderDemo{
	public static void mian(String[] args) throws Exception{
        //創(chuàng)建字符緩沖輸入流對象
        InputStreamReader isr = new InputStreamReader(new FileInputStream("osw.txt"));
        
        //一次讀取一個字符數(shù)組
        char[] chs = new char[1024];
        int len = 0;
        while((len=isr.read(chs))!=-1){
            sout(new String(chs,0,len));
        }
        isr.close();
    }    
}

2.字符輸出流

1.java.io.Writer:字符輸出流,抽象類
    具體的子類:OutputStreamWriter:字符轉(zhuǎn)換輸出流
2.構(gòu)造方法:
	public OutputStreamWriter(OutputStream out):使用平臺默認(rèn)字符集編碼
    public OutputStreamWriter(OutputStream out,String charsetName):使用指定的字符集進(jìn)行編碼
  寫的功能:
	public void write(char[] cbuf) throws IOException:寫一個字符數(shù)組
    public abstract void write(char[] cbuf,int off,int len)throws IOException:從指定位置開始寫入一部分字符數(shù)組
    public void write(String str)throws IOExceotion:寫入字符串
    public void write(String str,int off,int len)throws IOException:寫字符串的一部分
    public void write(int c)throws IOException:寫一個字符
3.代碼實現(xiàn):
	public class WriteDemo{
        public static void main(String[] args) throw Exception{
            //創(chuàng)建字符緩沖輸出流對象
            OutputStreamWriter osw = new OutputStreamWriter(new FileOutputStream("osw.txt"));
            //寫數(shù)據(jù)
            osw.write("hello,字符流我來了");
            //寫一個字符
            osw.write(97);
            //寫一個字符數(shù)組
            char[] chs = {"高","圓","圓"};
            osw.write(chs);
            
            //關(guān)閉前刷新流
            osw.flush();
            osw.close();
        }
    }

3.使用字符轉(zhuǎn)換輸入流和轉(zhuǎn)換輸出流來復(fù)制一個文本

1.字符流里直接操作文件--->字符轉(zhuǎn)換流的便捷類
    直接子類:public FileReader(String fileName) throws FileNotFoundException
           public FileWriter(String fileName) throws IOException
2.代碼實現(xiàn):
public class CopyFileTest{
    public static void main(String[] args) throws Exception{
        method1("BufferedOutputStreamDemo.java","D:\\EE_2113\\day27_pm\\code\\copy4.java") ;
         method2("BufferedOutputStreamDemo.java","D:\\EE_2113\\day27_pm\\code\\copy2.java") ;
    }
    //使用字符轉(zhuǎn)換流的便捷類來直接操作文件---一次讀取一個字符數(shù)組
    private static void method1(String sourch,String dest) throws Exception{
        //創(chuàng)建FileReader類對象
        FileReader fr = new FileReader(source);
        //創(chuàng)建FileWriter類對象
        FileWriter fw = new FileWriter(dest);
        
        //一次讀取一個字符數(shù)組
        char[] chs = new char[1024];
        int len = 0;
        while((len = fr.read(chs))!=-1){
            fw.write(chs,0,len);
        }
        
        fw.close();
        fr.close();
    }
    
    
    //使用字符轉(zhuǎn)換輸入流一次讀取一個字符數(shù)組
    private static void method2(String source,String dest) throws Exception{
        InputStreamReader isr = new InptStreamReader(new FileInputStream(source));
        OutputStreamWriter osw = new OutputStreamReader(new FileOutputStream(dest));
        char[] chs = new char[1024];
        int len = 0 ;
        while((len=isr.read(chs))!= -1){
            osw.write(chs,0,len);
        }
        osw.close();
        isr.close();
    }
}

以上就是動力節(jié)點小編介紹的"讓我們來看看字符輸出流"，希望對大家有幫助，如有疑問，請在線咨詢，有專業(yè)老師隨時為您務(wù)。