Java之IO流技术

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                           ----IO------

1. 分类

输入流：        字节输入流：InputStream-----》FileInputStream---------------》BufferInputStream输出流：        字节输出流：OutputStream-----》FileOutputStream---------------》BufferOutputStream内存流：        字节数组：ByteArrayInputStream和ByteArrayOutputStream        字符流：CharArrayReader和CharWriter        字符串流：StringReader和StringWriter打印流：只有输出流：PrintWriter标准输入输出流：System.in和System.out随机流：RandomAccessFile合并流：SequenceInputStream序列化流：ObjectInoputStream反序列化流：ObjectOutputStream

2. 举例

读文件1：------------------------------------------------------------》try {            FileInputStream inputStream = new FileInputStream("test.txt");            int by=-1;        while((by=inputStream.read())!=-1){            System.out.print((char)by);        }                   } catch (FileNotFoundException e) {            e.printStackTrace();        } catch (IOException e) {            e.printStackTrace();        }读文件2（缓存）：--------------------------------------------------------》FileInputStream inputStream = new FileInputStream("test.txt");        FileOutputStream outputStream = new FileOutputStream("copy.txt");        int by=-1;        while((by=inputStream.read())!=-1){            outputStream.write(by);        }        inputStream.close();        outputStream.close();读文件3（缓存）：----------------------------------------------------》FileInputStream inputStream = new FileInputStream("test.txt");        byte[]buffer=new byte[1024];        FileOutputStream outputStream = new FileOutputStream("copy1.txt");        int by=-1;        while((by=inputStream.read(buffer))!=-1){            outputStream.write(buffer,0,by);        }读文件4（缓存）：-------------------------------------------------》BufferedOutputStream fox = new BufferedOutputStream(new FileOutputStream("fox.txt"));        fox.write("1234567".getBytes());        fox.close();        BufferedInputStream bis = new BufferedInputStream(new FileInputStream("fox.txt"));        int by=-1;        while((by=bis.read())!=-1){            System.out.print((char)by);        }写文件：----------------------------------------------------------------》String content = "hello,IO";        byte[] buffer = content.getBytes();        FileOutputStream outputStream = null;        try {            outputStream = new FileOutputStream("hello.txt",true);            for (int i = 0; i < 10; i++) {                outputStream.write(("hello,IO" + i).getBytes());                outputStream.write("\r\n".getBytes());                          }        } catch (FileNotFoundException e) {            e.printStackTrace();        } catch (IOException e) {            // TODO Auto-generated catch block            e.printStackTrace();        }finally {        try {            outputStream.close();                   } catch (IOException e) {            e.printStackTrace();        }               }

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