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