响应字符数据

@WebServlet("/servletDemo3")
public class HttpServletDemo3 extends HttpServlet {

    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        //设置响应编码格式
        resp.setContentType("text/html;charset=UTF-8");
        //获取字节输出流
        ServletOutputStream os = resp.getOutputStream();
        //写数据
        os.write("你好".getBytes("UTF-8"));
    }

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