一個朋友讓我幫他寫一個基于 Servlet +Jetty+Derby 實現的項目。本文先介紹 Maven+Jetty+Servlet 的整合例子。

1、添加依賴

pom.xml 里添加依賴

javax.servlet

javax.servlet-api

3.1.0

org.eclipse.jetty

9.4.14.v20181114

jetty-webapp

2、準備兩個 Servlet 例子

HelloServlet

package com.example.server.servlet;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import java.io.IOException;

/**

* @author 言曌

* @date 2020/2/29 1:03 下午

*/

public class HelloServlet extends HttpServlet {

private static final long serialVersionUID = 1L;

private String msg = "Hello World!";

public HelloServlet() {

}

public HelloServlet(String msg) {

this.msg = msg;

}

@Override

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

response.setContentType("text/html");

response.setStatus(HttpServletResponse.SC_OK);

response.getWriter().println("

" + msg + "

");

response.getWriter().println("session=" + request.getSession(true).getId());

}

}

GoodbyeServlet

package com.example.server.servlet;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import java.io.IOException;

/**

* @author 言曌

* @date 2020/2/29 1:08 下午

*/

public class GoodbyeServlet extends HttpServlet {

private static final long serialVersionUID = 1L;

private String msg = "Goodbye!";

public GoodbyeServlet() {

}

public GoodbyeServlet(String msg) {

this.msg = msg;

}

@Override

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

response.setContentType("text/html");

response.setStatus(HttpServletResponse.SC_OK);

response.getWriter().println("

" + msg + "

");

response.getWriter().println("session=" + request.getSession(true).getId());

}

}

3、啟動類

將 URL路徑映射到對應的 Servlet

啟動 jetty 內置服務器

package com.example;

/**

* @author 言曌

* @date 2020/2/29 1:09 下午

*/

import com.example.server.servlet.GoodbyeServlet;

import com.example.server.servlet.HelloServlet;

import org.eclipse.jetty.server.Server;

import org.eclipse.jetty.servlet.ServletContextHandler;

import org.eclipse.jetty.servlet.ServletHolder;

public class JettyWebAppApplication {

public static void main(String[] args) throws Exception {

Server server = new Server(8080);

ServletContextHandler context = new ServletContextHandler(ServletContextHandler.SESSIONS);

context.setContextPath("/");

server.setHandler(context);

// http://localhost:8080/hello

context.addServlet(new ServletHolder(new HelloServlet()), "/hello");

// http://localhost:8080/hello/kongxx

context.addServlet(new ServletHolder(new HelloServlet("Hello Kongxx!")), "/hello/kongxx");

// http://localhost:8080/goodbye

context.addServlet(new ServletHolder(new GoodbyeServlet()), "/goodbye");

// http://localhost:8080/goodbye/kongxx

context.addServlet(new ServletHolder(new GoodbyeServlet("Goodbye kongxx!")), "/goodbye/kongxx");

server.start();

server.join();

}

}

然后啟動該類，訪問localhost:8080/hello 即可驗證

總結

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