Spring项目结构 | 易学教程

package com.layne.my.shop.common.context;

import org.apache.commons.lang3.Validate;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.BeansException;
import org.springframework.beans.factory.DisposableBean;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;


public  class SpringContext implements ApplicationContextAware, DisposableBean {

    private static  final Logger logger = LoggerFactory.getLogger(SpringContext.class);

    private static ApplicationContext applicationContext;

    /**
     * 获取存储在静态变量中的 ApplicationContext
     * @return
     */
    public static ApplicationContext getApplicationContext() {
        assertContextInjected();
        return applicationContext;
    }

    /**
     * 使用ApplicationContext,根据BeanId获取实例
     * @param beanId
     * @param <T>
     * @return
     */
    public  static <T> T getBeanExample(String beanId){
        assertContextInjected();
        return (T) applicationContext.getBean(beanId);
    }
    /**
     * 使用ApplicationContext,根据BeanId获取实例
     * @param clazz
     * @param <T>
     * @return
     */
    public static <T> T getBeanExample(Class<T> clazz){
        assertContextInjected();
        return applicationContext.getBean(clazz);
    }

    @Override
    public void destroy() throws Exception {
         logger.debug("清空ApplicationContext");
        applicationContext=null;
    }
    @Override
    public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
        SpringContext.applicationContext=applicationContext;
    }
   /* public Object getBean(String beanId){
        ApplicationContext context=new ClassPathXmlApplicationContext("spring-context.xml");
        return context.getBean(beanId);
    }*/

    /**
     * 断言容器【ApplicationContext】已经注入
     * public static void validState(boolean expression, String message, Object... values) {
     *         if (!expression) {
     *             throw new IllegalStateException(String.format(message, values));
     *         }
     *     }
     *
     *     1.applicationContext!=null----->applicationContext为空---->applicationContext!=null【false】------>!expression【true】
     *     2.applicationContext==null----->applicationContext为空---->applicationContext!=null【true】------>!expression【false】
     */
    private  static void assertContextInjected(){
        Validate.validState(applicationContext!=null,"你还没有在spring-context.xml中配置SpringContext对象");
    }
}

　POM.XML

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>com.layne</groupId>
    <artifactId>my-shop</artifactId>
    <version>1.0.0-SNAPSHOT</version>
    <packaging>war</packaging>

    <properties>
          <slf4j.version>1.7.25</slf4j.version>
          <log4j.version>1.2.17</log4j.version>
          <spring.version>4.3.17.RELEASE</spring.version>
          <servlet-api.version>4.0.1</servlet-api.version>
         <commons-lang3>3.5</commons-lang3>
    </properties>
    <dependencies>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context</artifactId>
            <version>${spring.version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-webmvc</artifactId>
            <version>${spring.version}</version>
        </dependency>

        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.12</version>
            <scope>test</scope>
        </dependency>

        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>javax.servlet-api</artifactId>
            <version>${servlet-api.version}</version>
        </dependency>

        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>jstl</artifactId>
            <version>1.2</version>
        </dependency>

        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-api</artifactId>
            <version>${slf4j.version}</version>
        </dependency>
        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-log4j12</artifactId>
            <version>${slf4j.version}</version>
        </dependency>
        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>jcl-over-slf4j</artifactId>
            <version>${slf4j.version}</version>
        </dependency>
        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>jul-to-slf4j</artifactId>
            <version>${slf4j.version}</version>
        </dependency>
        <dependency>
            <groupId>log4j</groupId>
            <artifactId>log4j</artifactId>
            <version>${log4j.version}</version>
        </dependency>

        <dependency>
            <groupId>org.apache.commons</groupId>
            <artifactId>commons-lang3</artifactId>
            <version>${commons-lang3}</version>
        </dependency>

    </dependencies>

</project>

　　WEB.XML

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd"
         version="4.0">

    <context-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>classpath:spring-context*.xml</param-value>
    </context-param>
    <listener>
        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
    </listener>

    <servlet>
        <servlet-name>LoginController</servlet-name>
        <servlet-class>com.layne.my.shop.web.controller.LoginController</servlet-class>
    </servlet>
    <servlet-mapping>
        <servlet-name>LoginController</servlet-name>
        <url-pattern>/login</url-pattern>
    </servlet-mapping>
</web-app>

　　INDEX.JSP

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<!DOCTYPE html>
<html>
<!--Head Begin-->
<head>
    <meta charset="utf-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <title>我的商城 | 登录</title>
    <!-- Tell the browser to be responsive to screen width -->
    <meta content="width=device-width, initial-scale=1, maximum-scale=1, user-scalable=no" name="viewport">
    <!-- Bootstrap 3.3.7 -->
    <link rel="stylesheet" href="assets/bower_components/bootstrap/dist/css/bootstrap.min.css"/>
    <!-- Font Awesome -->
    <link rel="stylesheet" href="assets/bower_components/font-awesome/css/font-awesome.min.css"/>
    <!-- Ionicons -->
    <link rel="stylesheet" href="assets/bower_components/Ionicons/css/ionicons.min.css"/>
    <!-- Theme style -->
    <link rel="stylesheet" href="assets/css/AdminLTE.min.css"/>
    <!-- iCheck -->
    <link rel="stylesheet" href="assets/plugins/iCheck/square/blue.css"/>
</head>
<!--Head end-->
<body class="hold-transition login-page">
<div class="login-box">
    <div class="login-logo">
        <a href="#">我的商城</a>
    </div>
    <!-- /.login-logo -->
    <div class="login-box-body">
        <p class="login-box-msg">欢迎管理员登录</p>
        <form action="/login" method="post">
               <%--<c:if test="${message != null}">
                <div class="alert alert-danger alert-dismissible">
                    <button type="button" class="close" data-dismiss="alert" aria-hidden="true">×</button>
                     ${message}
                </div>
               </c:if>--%>
                <div class="alert alert-danger alert-dismissible" ${message==null?"style='display: none'":""}>
                    <button type="button" class="close" data-dismiss="alert" aria-hidden="true">×</button>
                        ${message}
                </div>
            <div class="form-group has-feedback">
                <input type="email" class="form-control" name="email" placeholder="邮箱">
                <span class="glyphicon glyphicon-envelope form-control-feedback"></span>
            </div>
            <div class="form-group has-feedback">
                <input type="password" class="form-control" name="password" placeholder="密码">
                <span class="glyphicon glyphicon-lock form-control-feedback"></span>
            </div>
            <div class="row">
                <div class="col-xs-8">
                    <div class="checkbox icheck">
                        <label>
                            <input type="checkbox"> 记住我
                        </label>
                    </div>
                </div>
                <!-- /.col -->
                <div class="col-xs-4">
                    <button type="submit" class="btn btn-primary btn-block btn-flat">登录</button>
                </div>
                <!-- /.col -->
            </div>
        </form>
        <a href="#">忘记密码</a><br>
    </div>
</div>
<!-- /.login-box-->
<!-- HTML5 Shim and Respond.js IE8 support of HTML5 elements and media queries -->
<!-- WARNING: Respond.js doesn't work if you view the page via file:// -->
<!--[if lt IE 9]>
<script src="https://oss.maxcdn.com/html5shiv/3.7.3/html5shiv.min.js"/>
<script src="https://oss.maxcdn.com/respond/1.4.2/respond.min.js"/>
<![endif]-->
<!-- jQuery 3 -->
<script src="assets/bower_components/jquery/dist/jquery.min.js"></script>
<!-- Bootstrap 3.3.7 -->
<script src="assets/bower_components/bootstrap/dist/js/bootstrap.min.js"></script>
<!-- iCheck -->
<script src="assets/plugins/iCheck/icheck.min.js"></script>
<script>
    $(function () {
        $('input').iCheck({
            checkboxClass: 'icheckbox_square-blue',
            radioClass: 'iradio_square-blue',
            increaseArea: '20%' /* optional */
        });
    });
</script>
</body>
</html>

来源：https://www.cnblogs.com/flytogalaxy/p/12103132.html

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