Writer writer = new OutputStreamWriter(out, charset);
writer.write(in);
writer.flush();
OutputStreamWriter constuctor does unnecessary buffer allocation (8kb)
Given that it already has a string, maybe it can be avoided writing a string to the stream directly.
out.write(in.getBytes(charset));
out.flush();
It's used in plaintext endpoints through StringHttpMessageConverter
Here's approximate difference in time
| String Length | copy (ns/op) | copyOSW (ns/op) |
| ------------- | ------------ | --------------- |
| 10 | 4.314 | 311.848 |
| 100 | 9.187 | 310.556 |
| 1,000 | 35.274 | 569.202 |
| 10,000 | 545.262 | 1581.522 |
| 50,000 | 1833.014 | 6171.236 |
| 100,000 | 3341.869 | 11976.815 |
Comment From: pivotal-cla
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Comment From: pivotal-cla
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