java的I/O建立于流（Stream）之上。输入流读取数据，输出流写入数据
输出流
java.io.OutputStream
包括的方法
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public abstract void write(int b) throws IOException public void write(byte[] data) throws IOException public void write（byte[] data, int offset, int length）throws IOException public void flush() throws IOException public void close() throws IOException
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