初识Spring security-无Security的SpringMVC

百度百科定义: Spring Security是一个能够为基于Spring的企业应用系统提供声明式的安全访问控制解决方案的安全框架。它提供了一组可以在Spring应用上下文中配置的Bean，充分利用了Spring IoC，DI（控制反转Inversion of Control ,DI:Dependency Injection 依赖注入）和AOP（面向切面编程）功能，为应用系统提供声明式的安全访问控制功能，减少了为企业系统安全控制编写大量重复代码的工作。

开始第一个示例吧。

首先，新建一个基于Spring MVC的web项目

目录结构如图

maven项目添加依赖包，主要包括Spring，SpringMVC和thymeleaf模板

<dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-core</artifactId>
    <version>4.2.1.RELEASE</version>
</dependency>
<dependency>
     <groupId>org.springframework</groupId>
     <artifactId>spring-web</artifactId>
     <version>4.2.1.RELEASE</version>
</dependency>
<dependency>
     <groupId>org.springframework</groupId>
     <artifactId>spring-webmvc</artifactId>
     <version>4.2.1.RELEASE</version>
</dependency>
<dependency>
     <groupId>org.thymeleaf</groupId>
     <artifactId>thymeleaf-spring4</artifactId>
     <version>3.0.2.RELEASE</version>
 </dependency>

配置xml文件：

1、web.xml文件

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="3.0"
         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">
  <listener>
    <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
  </listener>
  <!-- Spring MVC -->
  <!-- springMVC的配置文件默认会去WEB-INF下寻找 servletName-servlet.xml 文件 -->
  <servlet>
    <servlet-name>mvc-dispatcher</servlet-name>
    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
    <load-on-startup>1</load-on-startup>
  </servlet>
  <servlet-mapping>
    <servlet-name>mvc-dispatcher</servlet-name>
    <url-pattern>/</url-pattern>
  </servlet-mapping>
  <!-- Loads Spring Security config file -->
  <context-param>
    <param-name>contextConfigLocation</param-name>
    <param-value>/WEB-INF/spring-security.xml</param-value>
  </context-param>
</web-app>

采用spring的话，必须配置contextConfigLocation指定spring的配置文件

2、spring-security.xml文件

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">
</beans>

暂时为空配置

3、mvc-dispatcher-servlet.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:context="http://www.springframework.org/schema/context"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd">
    <context:component-scan base-package="com.petter"/>
    <!--<bean id="viewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix" value="/WEB-INF/pages/"/>
        <property name="suffix" value=".html"/>
    </bean>-->
    <bean id="templateResolver" class="org.thymeleaf.spring4.templateresolver.SpringResourceTemplateResolver">
        <property name="prefix" value="/WEB-INF/pages/" />
        <property name="suffix" value=".html"/>
        <property name="templateMode" value="HTML"/>
        <property name="cacheable" value="false"/>
        <!-- 解决中文乱码 -->
        <property name="characterEncoding" value="UTF-8"/>
    </bean>
    <bean id="templateEngine" class="org.thymeleaf.spring4.SpringTemplateEngine">
        <property name="templateResolver" ref="templateResolver"/>
    </bean>
    <bean class="org.thymeleaf.spring4.view.ThymeleafViewResolver">
        <property name="templateEngine" ref="templateEngine"/>
        <!-- 解决中文乱码 -->
        <property name="characterEncoding" value="UTF-8"/>
    </bean>
</beans>

注意这里面的配置是SpringMVC和thymeleaf的整合配置

编写HelloController

package com.petter.web;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.servlet.ModelAndView;
/**
 * @author hongxf
 * @since 2017-03-03 13:48
 */
@Controller
public class HelloController {
    @RequestMapping(value = "/welcome", method = RequestMethod.GET)
    public ModelAndView welcomePage() {
        ModelAndView model = new ModelAndView();
        model.addObject("title", "Spring Security Hello World");
        model.addObject("message", "This is welcome page !");
        model.setViewName("hello");
        return model;
    }
}

编写Hello.html

<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml"
      xmlns:th="http://www.thymeleaf.org">
<head>
    <meta charset="UTF-8" />
    <title>hello</title>
</head>
<body>
    <h1 th:text="|标题: ${title}|">Title : XXX</h1>
    <h1 th:text="|信息: ${message}|">Message : XXX</h1>
</body>
</html>

运行应用：访问http://localhost:8080/welcome，结果如下