Maven+Jetty+Servlet 简单示例

avatar 2020年02月29日14:23:31 0 849 views
一个朋友让我帮他写一个基于 Servlet +Jetty+Derby 实现的项目。本文先介绍 Maven+Jetty+Servlet 的整合例子。

1、添加依赖


pom.xml 里添加依赖
<!--  Servlet  -->
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>javax.servlet-api</artifactId>
<version>3.1.0</version>
</dependency>

<!-- jetty -->
<dependency>
<groupId>org.eclipse.jetty</groupId>
<version>9.4.14.v20181114</version>
<artifactId>jetty-webapp</artifactId>
</dependency>

 

2、准备两个 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("<h1>" + msg + "</h1>");
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("<h1>" + msg + "</h1>");
response.getWriter().println("session=" + request.getSession(true).getId());
}
}

 

3、启动类


将 URL路径映射到对应的 Servlet

启动 jetty 内置服务器
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();
}
}

 

然后启动该类,访问localhost:8080/hello 即可验证

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