Package java.io

Class OutputStreamWriter

  • All Implemented Interfaces:
    Closeable, Flushable, Appendable, AutoCloseable
    Direct Known Subclasses:
    FileWriter
    public class OutputStreamWriter
extends Writer
    A class for turning a character stream into a byte stream. Data written to the target input stream is converted into bytes by either a default or a provided character converter. The default encoding is taken from the "file.encoding" system property. OutputStreamWriter contains a buffer of bytes to be written to target stream and converts these into characters as needed. The buffer size is 8K.
    See Also:
    InputStreamReader

    • Constructor Detail

      • OutputStreamWriter

        public OutputStreamWriter​(OutputStream out)
        Constructs a new OutputStreamWriter using out as the target stream to write converted characters to. The default character encoding is used.
        Parameters:
        out - the non-null target stream to write converted bytes to.

      • OutputStreamWriter

        public OutputStreamWriter​(OutputStream out,
                          String charsetName)
                   throws UnsupportedEncodingException
        Constructs a new OutputStreamWriter using out as the target stream to write converted characters to and charsetName as the character encoding. If the encoding cannot be found, an UnsupportedEncodingException error is thrown.
        Parameters:
        out - the target stream to write converted bytes to.
        charsetName - the string describing the desired character encoding.
        Throws:
        NullPointerException - if charsetName is null.
        UnsupportedEncodingException - if the encoding specified by charsetName cannot be found.

      • OutputStreamWriter

        public OutputStreamWriter​(OutputStream out,
                          Charset cs)
        Constructs a new OutputStreamWriter using out as the target stream to write converted characters to and cs as the character encoding.
        Parameters:
        out - the target stream to write converted bytes to.
        cs - the Charset that specifies the character encoding.

      • OutputStreamWriter

        public OutputStreamWriter​(OutputStream out,
                          CharsetEncoder charsetEncoder)
        Constructs a new OutputStreamWriter using out as the target stream to write converted characters to and charsetEncoder as the character encoder.
        Parameters:
        out - the target stream to write converted bytes to.
        charsetEncoder - the character encoder used for character conversion.

    • Method Detail

      • close

        public void close()
           throws IOException
        Closes this writer. This implementation flushes the buffer but does not flush the target stream. The target stream is then closed and the resources for the buffer and converter are released.

        Only the first invocation of this method has any effect. Subsequent calls do nothing.

        Specified by:
        close in interface AutoCloseable
        Specified by:
        close in interface Closeable
        Specified by:
        close in class Writer
        Throws:
        IOException - if an error occurs while closing this writer.

      • flush

        public void flush()
           throws IOException
        Flushes this writer. This implementation ensures that all buffered bytes are written to the target stream. After writing the bytes, the target stream is flushed as well.
        Specified by:
        flush in interface Flushable
        Specified by:
        flush in class Writer
        Throws:
        IOException - if an error occurs while flushing this writer.

      • getEncoding

        public String getEncoding()
        Returns the canonical name of the encoding used by this writer to convert characters to bytes, or null if this writer has been closed. Most callers should probably keep track of the String or Charset they passed in; this method may not return the same name.

      • write

        public void write​(char[] buffer,
                  int offset,
                  int count)
           throws IOException
        Writes count characters starting at offset in buf to this writer. The characters are immediately converted to bytes by the character converter and stored in a local buffer. If the buffer gets full as a result of the conversion, this writer is flushed.
        Specified by:
        write in class Writer
        Parameters:
        buffer - the array containing characters to write.
        offset - the index of the first character in buf to write.
        count - the maximum number of characters to write.
        Throws:
        IndexOutOfBoundsException - if offset < 0 or count < 0, or if offset + count is greater than the size of buf.
        IOException - if this writer has already been closed or another I/O error occurs.

      • write

        public void write​(int oneChar)
           throws IOException
        Writes the character oneChar to this writer. The lowest two bytes of the integer oneChar are immediately converted to bytes by the character converter and stored in a local buffer. If the buffer gets full by converting this character, this writer is flushed.
        Overrides:
        write in class Writer
        Parameters:
        oneChar - the character to write.
        Throws:
        IOException - if this writer is closed or another I/O error occurs.

      • write

        public void write​(String str,
                  int offset,
                  int count)
           throws IOException
        Writes count characters starting at offset in str to this writer. The characters are immediately converted to bytes by the character converter and stored in a local buffer. If the buffer gets full as a result of the conversion, this writer is flushed.
        Overrides:
        write in class Writer
        Parameters:
        str - the string containing characters to write.
        offset - the start position in str for retrieving characters.
        count - the maximum number of characters to write.
        Throws:
        IOException - if this writer has already been closed or another I/O error occurs.
        IndexOutOfBoundsException - if offset < 0 or count < 0, or if offset + count is bigger than the length of str.