在重定向代码之前，将参数值用以下代码编码一下即可。
message = URLEncoder.encode(message, "UTF-8");
代码如下：
@WebServlet(urlPatterns = "/check")
public class CheckServler extends HttpServlet{@Overridepublic void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {String username = request.getParameter("username"); String message = null;if(username == null) {message = "Please input username.";}else {message = "Hello, " + username; }message = URLEncoder.encode(message, "UTF-8");response.sendRedirect("/helloapp/output?msg="+message); }
}@WebServlet(urlPatterns = "/output")
public class OutputServlet extends HttpServlet {@Overridepublic void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletExcept