Examples of org.apache.commons.io.output.ByteArrayOutputStream

org.apache.commons.io.output.ByteArrayOutputStream
This class implements an output stream in which the data is written into a byte array. The buffer automatically grows as data is written to it.
The data can be retrieved using toByteArray() and toString().
Closing a ByteArrayOutputStream has no effect. The methods in this class can be called after the stream has been closed without generating an IOException.
This is an alternative implementation of the java.io.ByteArrayOutputStream class. The original implementation only allocates 32 bytes at the beginning. As this class is designed for heavy duty it starts at 1024 bytes. In contrast to the original it doesn't reallocate the whole memory block but allocates additional buffers. This way no buffers need to be garbage collected and the contents don't have to be copied to the new buffer. This class is designed to behave exactly like the original. The only exception is the deprecated toString(int) method that has been ignored. @author Jeremias Maerki @version $Id: ByteArrayOutputStream.java 369075 2006-01-14 18:23:42Z scolebourne $

        assertEquals("Sizes differ", inData.length, baout.size());
        assertTrue("Content differs", Arrays.equals(inData, baout.toByteArray()));
    }


    public void testCopy_inputStreamToWriter_nullIn() throws Exception {
        ByteArrayOutputStream baout = new ByteArrayOutputStream();
        OutputStream out = new YellOnFlushAndCloseOutputStream(baout, true, true);
        Writer writer = new OutputStreamWriter(out, "US-ASCII");
        try {
            IOUtils.copy((InputStream) null, writer);
            fail();

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    //-----------------------------------------------------------------------
    public void testCopy_inputStreamToWriter_Encoding() throws Exception {
        InputStream in = new ByteArrayInputStream(inData);
        in = new YellOnCloseInputStream(in);


        ByteArrayOutputStream baout = new ByteArrayOutputStream();
        YellOnFlushAndCloseOutputStream out = new YellOnFlushAndCloseOutputStream(baout, true, true);
        Writer writer = new OutputStreamWriter(baout, "US-ASCII");
        
        IOUtils.copy(in, writer, "UTF8");
        out.off();
        writer.flush();


        assertEquals("Not all bytes were read", 0, in.available());
        byte[] bytes = baout.toByteArray();
        bytes = new String(bytes, "UTF8").getBytes("US-ASCII");
        assertTrue("Content differs", Arrays.equals(inData, bytes));
    }

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        bytes = new String(bytes, "UTF8").getBytes("US-ASCII");
        assertTrue("Content differs", Arrays.equals(inData, bytes));
    }


    public void testCopy_inputStreamToWriter_Encoding_nullIn() throws Exception {
        ByteArrayOutputStream baout = new ByteArrayOutputStream();
        OutputStream out = new YellOnFlushAndCloseOutputStream(baout, true, true);
        Writer writer = new OutputStreamWriter(out, "US-ASCII");
        try {
            IOUtils.copy((InputStream) null, writer, "UTF8");
            fail();

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    public void testCopy_inputStreamToWriter_Encoding_nullEncoding() throws Exception {
        InputStream in = new ByteArrayInputStream(inData);
        in = new YellOnCloseInputStream(in);


        ByteArrayOutputStream baout = new ByteArrayOutputStream();
        YellOnFlushAndCloseOutputStream out = new YellOnFlushAndCloseOutputStream(baout, true, true);
        Writer writer = new OutputStreamWriter(baout, "US-ASCII");
        
        IOUtils.copy(in, writer, null);
        out.off();
        writer.flush();


        assertEquals("Not all bytes were read", 0, in.available());
        assertEquals("Sizes differ", inData.length, baout.size());
        assertTrue("Content differs", Arrays.equals(inData, baout.toByteArray()));
    }

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    public void testCopy_readerToOutputStream() throws Exception {
        InputStream in = new ByteArrayInputStream(inData);
        in = new YellOnCloseInputStream(in);
        Reader reader = new InputStreamReader(in, "US-ASCII");
        
        ByteArrayOutputStream baout = new ByteArrayOutputStream();
        OutputStream out = new YellOnFlushAndCloseOutputStream(baout, false, true);
        
        IOUtils.copy(reader, out);
        //Note: this method *does* flush. It is equivalent to:
        //  OutputStreamWriter _out = new OutputStreamWriter(fout);
        //  IOUtils.copy( fin, _out, 4096 ); // copy( Reader, Writer, int );
        //  _out.flush();
        //  out = fout;


        // Note: rely on the method to flush
        assertEquals("Sizes differ", inData.length, baout.size());
        assertTrue("Content differs", Arrays.equals(inData, baout.toByteArray()));
    }

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        assertEquals("Sizes differ", inData.length, baout.size());
        assertTrue("Content differs", Arrays.equals(inData, baout.toByteArray()));
    }


    public void testCopy_readerToOutputStream_nullIn() throws Exception {
        ByteArrayOutputStream baout = new ByteArrayOutputStream();
        OutputStream out = new YellOnFlushAndCloseOutputStream(baout, true, true);
        try {
            IOUtils.copy((Reader) null, out);
            fail();
        } catch (NullPointerException ex) {}

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    public void testCopy_readerToOutputStream_Encoding() throws Exception {
        InputStream in = new ByteArrayInputStream(inData);
        in = new YellOnCloseInputStream(in);
        Reader reader = new InputStreamReader(in, "US-ASCII");
        
        ByteArrayOutputStream baout = new ByteArrayOutputStream();
        OutputStream out = new YellOnFlushAndCloseOutputStream(baout, false, true);


        IOUtils.copy(reader, out, "UTF16");
        // note: this method *does* flush.
        // note: we don't flush here; this IOUtils method does it for us
        
        byte[] bytes = baout.toByteArray();
        bytes = new String(bytes, "UTF16").getBytes("US-ASCII");
        assertTrue("Content differs", Arrays.equals(inData, bytes));
    }

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        bytes = new String(bytes, "UTF16").getBytes("US-ASCII");
        assertTrue("Content differs", Arrays.equals(inData, bytes));
    }


    public void testCopy_readerToOutputStream_Encoding_nullIn() throws Exception {
        ByteArrayOutputStream baout = new ByteArrayOutputStream();
        OutputStream out = new YellOnFlushAndCloseOutputStream(baout, true, true);
        try {
            IOUtils.copy((Reader) null, out, "UTF16");
            fail();
        } catch (NullPointerException ex) {}

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    public void testCopy_readerToOutputStream_Encoding_nullEncoding() throws Exception {
        InputStream in = new ByteArrayInputStream(inData);
        in = new YellOnCloseInputStream(in);
        Reader reader = new InputStreamReader(in, "US-ASCII");
        
        ByteArrayOutputStream baout = new ByteArrayOutputStream();
        OutputStream out = new YellOnFlushAndCloseOutputStream(baout, false, true);


        IOUtils.copy(reader, out, null);
        // note: this method *does* flush.
        // note: we don't flush here; this IOUtils method does it for us


        assertEquals("Sizes differ", inData.length, baout.size());
        assertTrue("Content differs", Arrays.equals(inData, baout.toByteArray()));
    }

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    public void testCopy_readerToWriter() throws Exception {
        InputStream in = new ByteArrayInputStream(inData);
        in = new YellOnCloseInputStream(in);
        Reader reader = new InputStreamReader(in, "US-ASCII");


        ByteArrayOutputStream baout = new ByteArrayOutputStream();
        YellOnFlushAndCloseOutputStream out = new YellOnFlushAndCloseOutputStream(baout, true, true);
        Writer writer = new OutputStreamWriter(baout, "US-ASCII");


        int count = IOUtils.copy(reader, writer);
        out.off();
        writer.flush();
        assertEquals("The number of characters returned by copy is wrong", inData.length, count);
        assertEquals("Sizes differ", inData.length, baout.size());
        assertTrue("Content differs", Arrays.equals(inData, baout.toByteArray()));
    }

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