web应用

实现HttpServlet的Web应用

      <dependency>

          <groupId>javax.servlet</groupId>

          <artifactId>javax.servlet-api</artifactId>

          <version>3.1.0</version>

          <scope>provided</scope>

      </dependency>

      <dependency>

          <groupId>javax.servlet.jsp</groupId>

          <artifactId>javax.servlet.jsp-api</artifactId>

          <version>2.2.1</version>

          <scope>provided</scope>

      </dependency>

      <dependency>

          <groupId>javax.servlet</groupId>

          <artifactId>jstl</artifactId>

          <version>1.2</version>

      </dependency>

      <plugin>

          <groupId>org.mortbay.jetty</groupId>

          <artifactId>jetty-maven-plugin</artifactId>

          <version>8.1.16.v20140903</version>

          <configuration>

              <scanIntervalSeconds>10</scanIntervalSeconds>

              <connectors>

                  <connector implementation="org.eclipse.jetty.server.nio.SelectChannelConnector">

                      <port>80</port>

                  </connector>

              </connectors>

              <webAppConfig>

                  <contextPath>/</contextPath>

              </webAppConfig>

          </configuration>

      </plugin>

pom.xml

import javax.servlet.ServletException;

import javax.servlet.annotation.WebServlet;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import java.io.IOException;

@WebServlet("/hello")

public class MyServlet extends HttpServlet {

    public void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {

        resp.setCharacterEncoding("utf-8");

        resp.getWriter().write("Hello World!");

    }

    public void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {

        doGet(req, resp);

    }

}

MyServlet

使用SpringMVC的Web应用

    <dependency>

      <groupId>javax.servlet</groupId>

      <artifactId>javax.servlet-api</artifactId>

      <version>3.1.0</version>

      <scope>provided</scope>

    </dependency>

    <dependency>

      <groupId>org.springframework</groupId>

      <artifactId>spring-webmvc</artifactId>

      <version>4.3.14.RELEASE</version>

    </dependency>

    <plugin>

        <groupId>org.mortbay.jetty</groupId>

        <artifactId>jetty-maven-plugin</artifactId>

        <version>8.1.16.v20140903</version>

        <configuration>

          <scanIntervalSeconds>10</scanIntervalSeconds>

          <connectors>

            <connector implementation="org.eclipse.jetty.server.nio.SelectChannelConnector">

              <port>80</port>

            </connector>

          </connectors>

          <webAppConfig>

            <contextPath>/</contextPath>

          </webAppConfig>

        </configuration>

      </plugin>

pom.cml

<?xml version="1.1" encoding="UTF-8"?>

<web-app xmlns="http://java.sun.com/xml/ns/javaee"

         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

         xsi:schemaLocation="http://java.sun.com/xml/ns/javaee

              http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"

         version="3.0">

<servlet>

    <servlet-name>myServlet</servlet-name>

    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>

    <init-param>

        <param-name>contextConfigLocation</param-name>

        <param-value>classpath:my_spring_mvc.xml</param-value>

    </init-param>

    <load-on-startup>1</load-on-startup>

</servlet>

<servlet-mapping>

    <servlet-name>myServlet</servlet-name>

    <url-pattern>/</url-pattern>

</servlet-mapping>

</web-app>

web.xml

<beans xmlns="http://www.springframework.org/schema/beans"

       xmlns:context="http://www.springframework.org/schema/context"

       xmlns:mvc="http://www.springframework.org/schema/mvc"

       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

       xsi:schemaLocation="

      http://www.springframework.org/schema/context

      http://www.springframework.org/schema/context/spring-context.xsd

      http://www.springframework.org/schema/mvc

      http://www.springframework.org/schema/mvc/spring-mvc.xsd

      http://www.springframework.org/schema/beans

      http://www.springframework.org/schema/beans/spring-beans.xsd">

<!-- Spring MVC提供的一键式配置方法，配置后Spring MVC会自动注册组件，比如映射器处理器、视图解析器等 -->

<mvc:annotation-driven/>

<!-- 包扫描 -->

<!--<context:component-scan base-package="com.test"/>-->

<!-- 包扫描，使用include-filter子标签设置只扫描@Controller，别的交给Spring容器去管理 -->

<context:component-scan base-package="com" use-default-filters="false">

    <context:include-filter type="annotation" expression="org.springframework.stereotype.Controller" />

</context:component-scan>

</beans>

package com.test;

import org.springframework.stereotype.Controller;

import org.springframework.ui.Model;

import org.springframework.web.bind.annotation.RequestMapping;

import org.springframework.web.bind.annotation.RequestMethod;

@Controller

public class MyController {

    @RequestMapping(value = "/", method = RequestMethod.GET)

    public String index(Model model) {

        model.addAttribute("msg", "Hello!");

        // 如果没有配置视图解析器ViewResolver，SpringMVC将默认使用

        // org.springframework.web.servlet.view.InternalResourceViewResolver作为ViewResolver，

        // 并且prefix和suffix都为空

        return "/WEB-INF/my.jsp";

    }

}

MyController

<%@ page contentType="text/html;charset=UTF-8" language="java" %>

<html>

<head>

    <title>My JSP</title>

</head>

<body>

<p>${msg}</p>

</body>

</html>

my.jsp