java code for Filtering page to UTF-8

import java.io.BufferedReader;
import java.io.IOException;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class UTF8 extends HttpServlet {

public void doGet(HttpServletRequest req, HttpServletResponse res) throws ServletException,
IOException {
try {
BufferedReader reader = req.getReader();

res.setContentType("text/html; charset=UTF-8");
PrintWriter out = new PrintWriter(new OutputStreamWriter(res.getOutputStream(), "UTF8"), true);

// Read and write 4K chars at a time
// (Far more efficient than reading and writing a line at a time)
char[] buf = new char[4 * 1024]; // 4Kchar buffer
int len;
while ((len = reader.read(buf, 0, buf.length)) != -1) {
out.write(buf, 0, len);
}
out.flush();
} catch (Exception e) {
getServletContext().log(e, "Problem filtering page to UTF-8");
}
}
}