1.Spring Security 的前身是 Acegi Security ，是 Spring 项目组中用来提供安全认证服务的框架
2.安全包括两个主要操作。
“认证”，是为用户建立一个他所声明的主体。主题一般式指用户，设备或可以在你系统中执行动作的其他系统。
“授权”指的是一个用户能否在你的应用中执行某个操作，在到达授权判断之前，身份的主题已经由身份验证过程建立了。
3.Spring Security 应用与用户登陆
需求：用户登陆后台不仅仅需要用户名和密码 ，并且需要相应的权限（如：authorities="ROLE_USER"才可以登陆）
4.环境搭建
1>Maven依赖
<properties>
<spring.security.version>5.0.1.RELEASE</spring.security.version>
</properties>
<!--spring security授权认证.jar -->
< dependencies>
<dependency>
<groupId>org.springframework.security</groupId>
<artifactId>spring-security-web</artifactId>
<version>${spring.security.version}</version>
</dependency>
<dependency>
<groupId>org.springframework.security</groupId>
<artifactId>spring-security-config</artifactId>
<version>${spring.security.version}</version>
</dependency>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>javax.servlet-api</artifactId>
<version>3.1.0</version>
<scope>provided</scope>
</dependency>
< /dependencies>
2>web.xml
<!--配置Spring的监听器，默认只加载WEB-INF目录下的applicationContext.xml配置文件 -->
<listener>
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>
<!--设置配置文件的路径 -->
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:applicationContext.xml,classpath:spring-security.xml</param-value>
</context-param>
<!--spring-serurity的过滤器 -->
<filter>
<filter-name>springSecurityFilterChain</filter-name>
<filter-class>org.springframework.web.filter.DelegatingFilterProxy</filter-class>
</filter>
<filter-mapping>
<filter-name>springSecurityFilterChain</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
3>spring-security.xml
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:security="http://www.springframework.org/schema/security"
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
http://www.springframework.org/schema/security
http://www.springframework.org/schema/security/spring-security.xsd">
<!-- 配置不拦截的资源 -->
<security:http pattern="/login.jsp" security="none"/>
<security:http pattern="/failer.jsp" security="none"/>
<security:http pattern="/css/**" security="none"/>
<security:http pattern="/img/**" security="none"/>
<security:http pattern="/plugins/**" security="none"/>
<!--
配置具体的规则
auto-config="true" 不用自己编写登录的页面，框架提供默认登录页面
use-expressions="false" 是否使用SPEL表达式（没学习过）
-->
<security:http auto-config="true" use-expressions="false">
<!-- 配置具体的拦截的规则 pattern="请求路径的规则" access="访问系统的人，必须有ROLE_USER的角色" -->
<security:intercept-url pattern="/**" access="ROLE_USER,ROLE_ADMIN"/>
<!-- 定义跳转的具体的页面 -->
<security:form-login
//那个页面发起的long请求
login-page="/WEB-INF/pages/login.jsp"
//匹配请求
login-processing-url="/login
//默认目标地址
default-target-url="/index.jsp"
//失败跳转地址
authentication-failure-url="/failer.jsp"
//成功跳转地址
authentication-success-forward-url="/WEB-INF/pages/main.jsp"
/>
<!-- 关闭跨域请求 -->
<security:csrf disabled="true"/>
<!-- 退出 -->
<security:logout invalidate-session="true" logout-url="/logout" logout-success-url="/login.jsp" />
</security:http>
<!-- 切换成数据库中的用户名和密码 -->
<security:authentication-manager>
<security:authentication-provider user-service-ref="userService">
<!-- 配置加密的方式
<security:password-encoder ref="passwordEncoder"/>-->
</security:authentication-provider>
</security:authentication-manager>
<!-- 配置加密类 -->
<bean id="passwordEncoder" class="org.springframework.security.crypto.bcrypt.BCryptPasswordEncoder"/>
<!-- 提供了入门的方式，在内存中存入用户名和密码
<security:authentication-manager>
<security:authentication-provider>
<security:user-service>
<security:user name="admin" password="{noop}admin" authorities="ROLE_USER"/>
</security:user-service>
</security:authentication-provider>
</security:authentication-manager>
-->
</beans>
5. <security:authentication-provider user-service-ref="userService">
userService 需要继承UserDatailsService
public interface UserService extends UserDetailsService{
}
6.userServiceImpl
public UserDetails loadUserByUsername(String username) throws UsernameNotFoundException {
UserInfo userInfo = userDao.findByUserName(username);
//不需要对用户的状态进行判断的3个参数即可(username,password,Authority)
// User user = new User(userInfo.getUsername(), "{noop}" + userInfo.getPassword(),getAuthority(userInfo.getRoles()));
//对用户状态进行判断
User user = new User(userInfo.getUsername(), "{noop}" + userInfo.getPassword(),
userInfo.getStatus() == 0 ? false : true, true, true, true, getAuthority(userInfo.getRoles()));
System.out.println(userInfo);
return user;
}
//将userInfo对象转化成Collection<? extends GrantedAuthority> authorities
public List<SimpleGrantedAuthority> getAuthority(List<Role> roles) {
ArrayList<SimpleGrantedAuthority> list = new ArrayList<SimpleGrantedAuthority>();
for (Role role : roles) {
list.add(new SimpleGrantedAuthority("ROLE_" + role.getRoleName()));
}
return list;
}