1.

public void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {

		print3(response);
	}

	private void print(HttpServletResponse response) throws IOException,
	UnsupportedEncodingException {
		String str = "中国";
		OutputStream out = response.getOutputStream();
		out.write(str.getBytes());
	}

2.

private void print1(HttpServletResponse response) throws IOException,
			UnsupportedEncodingException {
		response.setHeader("content-type", "text/html;charset=UTF-8");
		String str = "中国";
		OutputStream out = response.getOutputStream();
		out.write(str.getBytes("UTF-8"));
	}

3.

private void print2(HttpServletResponse response) throws IOException,
	UnsupportedEncodingException {
		String str = "中国";
		OutputStream out = response.getOutputStream();
		out.write("<meta http-equiv='content-type' content='text/html;charset=UTF-8'>".getBytes());
		out.write(str.getBytes("UTF-8"));
	}