Method parameters and structural parameters IO stream

IO flow Notes

Byte stream InputStream / OutputStream

The basic flow

1.1 Constructs

Output stream configuration

• public FileOutputStream(File file): Create a file output stream to write to the file represented by the specified File object.
• public FileOutputStream(String name): Create a file output stream to write to the file name specified.
• FileOutputStream(File file, boolean append):add to

Configuration input stream

• FileInputStream(File file)
• FileInputStream(String name)

1.2 the output stream write () method

• write(int b)

• write(byte[] b)

• write(byte[] b, int off, int len)

• write(int b, boolean append)

1.3 input stream read () method

• int read(byte[] b)
• int read()
• read(byte b[], int off, int len)

Buffer flow

1.1 Constructs

Configuration input stream

• BufferedInputStream(InputStream in)
• BufferedInputStream(InputStream in, int size)

Output stream configuration

• BufferedOutputStream(OutputStream out)
• BufferedOutputStream(OutputStream out, int size)

1.2 the output stream write () method

• write(byte b[], int off, int len)
• write(int b)

1.3 input stream read () method

• int read()
• int read(byte[] b, int off, int len)
• int read(byte b[])

Serialized object stream

1.1 Constructs

Configuration input stream

• ObjectInputStream(InputStream in)

Output stream configuration

• ObjectOutputStream(OutputStream out)

1.2 the output stream write () method

• writeObject(Object obj)

1.3 input stream read () method

• Object readObject()

1.4 serialized object implementation

• Object class implements Serializable

Random access flow RandomAccessFile

1.1 Constructs

structure

• RandomAccessFile(File file, String mode)
• RandomAccessFile(String name, String mode)

mode -> r (read-only), rw (read-write)

1.2 the output stream write () method

• write(byte b[], int off, int len)
• write(byte b[])
• write(int b)

1.3 input stream read () method

• int read(byte b[])
• int read()

1.4 Set the start position

• seek(long pos)

---

Character stream Reader / Writer

The basic flow

2.1 construction

Configuration input stream

• FileReader(File file)
• FileReader(String fileName)

Output stream configuration

• FileWriter(File file)
• FileWriter(String fileName)

2.2 the output stream write () method

• write(int c)
• write(char[] cbuf)
• write(char[] cbuf, int off, int len)
• write(String str)
• write(String str, int off, int len)

2.3 input stream read () method

• int read()
• int read(char[] cbuf) No buffer flow
• int read(char cbuf[], int off, int len)

Buffer flow

2.1 construction

Configuration input stream

• BufferedReader(Reader in)
• BufferedReader(Reader in, int sz)

Output stream configuration

• BufferedWriter(Writer out)
• BufferedWriter(Writer out, int sz)

2.2 the output stream write () method

• write(String str)
• write(String str, int off, int len)
• write(char cbuf[])
• write(char cbuf[], int off, int len)
• write(int c)
• ** newLine()** The basic flow no

2.3 input stream read () method

• int read()
• read(char[] cbuf, int off, int len)
• String readLine(boolean ignoreLF) The basic flow no

Conversion flow

2.1 construction

Configuration input stream

• InputStreamReader(InputStream in)

• InputStreamReader(InputStream in, String charsetName)

Output stream configuration

• OutputStreamWriter(OutputStream in)

• OutputStreamWriter(OutputStream out, String charsetName)

2.2 the output stream write () method

• write(int c)
• write(char[] cbuf, int off, int len)
• write(String str, int off, int len)

2.3 input stream read () method

• int read()
• int read(char[] cbuf) No buffer flow
• read(char cbuf[], int off, int len)

note

When you create a stream object, the object file input and output streams can not be the same file!

E.g:

BufferedReader br= new BufferedReader(new FileReader(“text.txt”));

BufferedWriter br = new BufferedWriter (new FileWriter(“text.txt”));

! ! After obtaining such an output stream objects, files, empty the contents directly! !

If the required input and output in the same file, read data can be finished in a while () in

Re-creating the output stream.

BufferedReader br = new BufferedReader(new FileReader("test5.txt"));
BufferedWriter bw = null;

String str;
StringBuffer sb = new StringBuffer();
while((str = br.readLine()) != null){
    sb.append(str.substring(0,10).toUpperCase());
    sb.append(str.substring(10,str.length()-10));
    for(int i = 0;i < 10;i++){
        char[] chars = str.substring(str.length() - 10).toCharArray();
        int num = chars[i];
        sb.append(num);
    }
}
bw = new BufferedWriter(new FileWriter("test5.txt"));
bw.write(sb.toString());
bw.close();