java - 有没有办法将 Servlet API 与 Undertow 一起使用？

Question

我刚刚发现 Undertow 是如何工作的，我对它的 api 感到惊讶:

Undertow server = Undertow.builder()
                .addHttpListener(8080, "localhost")
                .setHandler(new HttpHandler() {
                    @Override
                    public void handleRequest(final HttpServerExchange exchange) throws Exception {
                        exchange.getResponseHeaders().put(Headers.CONTENT_TYPE, "text/plain");
                        exchange.getResponseSender().send("Hello World");
                    }
                }).build();
        server.start();

有没有办法像这样使用更方便的servlet api？

Undertow server = Undertow.builder()
                .addHttpListener(8080, "localhost")
                .setHandler(new HttpHandler() {
                    @Override
                    public void handleRequest(final HttpServletRequest request, final HttpServletResponse response) throws Exception {
                        // ...
                    }
                }).build();
        server.start();

我想要实现的是用 Undertow 替换当前使用 servlet api 的 Jetty 容器，但是在阅读了文档和源代码之后，我似乎无法找到一种方法来这样做。我没有使用 .war 文件只是一个嵌入式 Jetty。有人有任何指示吗？

Answer 1

它记录在 Creating a Servlet Deployment 部分。这是一个基于文档的 MCVE，前提是您有 dependencies对，还有 Servlet API。

package com.stackoverflow.q35269763;

import io.undertow.Handlers;
import io.undertow.Undertow;
import io.undertow.server.handlers.PathHandler;
import io.undertow.servlet.Servlets;
import io.undertow.servlet.api.DeploymentInfo;
import io.undertow.servlet.api.DeploymentManager;

import java.io.IOException;

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

public class Test {

    public static void main(String... args) throws Exception {
        DeploymentInfo servletBuilder = Servlets.deployment().setClassLoader(Test.class.getClassLoader())
            .setDeploymentName("myapp").setContextPath("/myapp")
            .addServlets(Servlets.servlet("myservlet",
                new HttpServlet() {
                    @Override
                    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
                        response.getWriter().write("Hello World!");
                    }
                }.getClass()).addMapping("/myservlet"));
        DeploymentManager manager = Servlets.defaultContainer().addDeployment(servletBuilder);
        manager.deploy();
        PathHandler path = Handlers.path(Handlers.redirect("/myapp")).addPrefixPath("/myapp", manager.start());
        Undertow server = Undertow.builder().addHttpListener(8888, "localhost").setHandler(path).build();
        server.start();
    }

}

当你打开http://localhost:8888/myapp/myservlet在复制'n'粘贴'n'运行上面的代码后，在您最喜欢的网络浏览器中，您会看到

Hello World!