Response输出中文乱码问题

@WebServlet("/ResponseDemo1")
//在servlet中用outputstream输出中文的问题
public class ResponseDemo1 extends HttpServlet{

	private static final long serialVersionUID = 1L;

	@Override
	protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
		test2(resp);
	}
	
	private void test4(HttpServletResponse resp) throws IOException, UnsupportedEncodingException {
		String data="中文";
		ServletOutputStream out = resp.getOutputStream();
		out.write(1);
	}
	private void test3(HttpServletResponse resp) throws IOException, UnsupportedEncodingException {
		String data="中文";
		ServletOutputStream out = resp.getOutputStream();
		//下面写错了，html后面是分号，这样会出现下载的情况
		resp.setHeader("Content-type", "text/html,charset=GBK");
		out.write(data.getBytes("GBK"));
	}
	private void test2(HttpServletResponse resp) throws IOException, UnsupportedEncodingException {
		String data="中文";
		//html: 标签可以模拟一个http响应头
		ServletOutputStream out = resp.getOutputStream();
		
		out.write("".getBytes());
		out.write(data.getBytes("GBK"));
	}
	private void test1(HttpServletResponse resp) throws IOException, UnsupportedEncodingException {
		String data="中文";
		//程序以什么码表输出，程序就一定要控制浏览器以什么码表打开
		resp.setHeader("Content-type", "text/html;charset=GBK");
		ServletOutputStream out = resp.getOutputStream();
//		out.write(data.getBytes());
		out.write(data.getBytes("GBK"));
	}

	@Override
	protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
		this.doPost(req, resp);
	}

}

//通过response的write流输出数据问题
@WebServlet("/ResponseDemo2")
public class ResponseDemo2 extends HttpServlet {
	private static final long serialVersionUID = 1L;
       

	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		String data="中文";
		//设置response使用的码表，以控制response以什么码表向浏览器写数据
//		response.setCharacterEncoding("UTF-8");
		//指定浏览器以什么码表打开服务器发送的数据
//		response.setHeader("content-type", "text/html;charset=UTF-8");
		response.setContentType("text/html;charset=UTF-8");//上面两句的综合
		PrintWriter writer = response.getWriter();
		writer.write(data);
	}

	private void test1(HttpServletResponse response) throws IOException {
		String data="中文";
		//设置response使用的码表，以控制response以什么码表向浏览器写数据
		response.setCharacterEncoding("UTF-8");
		//指定浏览器以什么码表打开服务器发送的数据
		response.setHeader("content-type", "text/html;charset=UTF-8");
		PrintWriter writer = response.getWriter();
		writer.write(data);
	}

	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		this.doGet(request, response);
	}

}