spring-security3 配置和使用

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web.xml配置

<context-param>

<param-name>contextConfigLocation</param-name>
<param-value>classpath*:applicationContext-*.xml</param-value>
</context-param>
<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>

application-security.xml配置

<?xml version="1.0" encoding="UTF-8"?>
<beans:beans xmlns="http://www.springframework.org/schema/security"
xmlns:beans="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-3.0.xsd
http://www.springframework.org/schema/security
http://www.springframework.org/schema/security/spring-security-3.0.xsd">
<!-- auto-config = true 则使用from-login. 如果不使用该属性则默认为http-basic(没有session).
access-denied-page:出错后跳转到的错误页面;
-->
<http auto-config="true" access-denied-page="/common/403.jsp">
<!-- intercept-url:拦截器,可以设定哪些路径需要哪些权限来访问. filters=none 不使用过滤,也可以理解为忽略
只有ROLE_USER角色的用户才能访问 -->
<intercept-url pattern="/index.jsp" access="ROLE_USER" />
<intercept-url pattern="/login.jsp" filters="none" />
<intercept-url pattern="/common/**" filters="none" />
<intercept-url pattern="/script/**" filters="none" />
<intercept-url pattern="/admin.jsp" access="ROLE_ADMIN" />
<intercept-url pattern="/user.jsp" access="ROLE_USER" />
<!-- id登陆唯一. 后登陆的账号会挤掉第一次登陆的账号 error-if-maximum-exceeded="true" 禁止2次登陆;
session-fixation-protection="none" 防止伪造sessionid攻击. 用户登录成功后会销毁用户当前的session.
创建新的session,并把用户信息复制到新session中.
-->
<session-management session-fixation-protection="none">
<concurrency-control/>
</session-management>
<form-login login-page="/login.jsp"
authentication-failure-url="/common/403.jsp"
default-target-url="/admin.jsp" />
<logout logout-success-url="/login.jsp"/>
<http-basic />
</http>
<authentication-manager>
<authentication-provider>
<password-encoder hash="md5">
<salt-source user-property="username"/>
</password-encoder>
-->
<jdbc-user-service data-source-ref="dataSource"
users-by-username-query="select username,password,enabled from user where username = ? and enabled = 1"
authorities-by-username-query="select u.username,r.name from user u join user_role ur on u.uid = ur.uid join role r on r.rid = ur.rid where u.username = ?" />
<!--
使用固定的用户名和密码及权限来做验证.
<user-service>
<user name="admin" password="admin" authorities="ROLE_USER, ROLE_ADMIN" />
<user name="user" password="user" authorities="ROLE_USER" />
</user-service>
-->
</authentication-provider>
</authentication-manager>
防止一个用户重复登录好几次-第二次登录会让第一次登录失效。通常我们更想防止第二次登录，这时候我们可以使用
```
    <session-management>        <concurrency-control max-sessions="1" error-if-maximum-exceeded="true" />    </session-management>     
```
</beans:beans>

获取当前用户信息

Object principal = SecurityContextHolder.getContext().getAuthentication().getPrincipal();if (principal instanceof UserDetails) {  String username = ((UserDetails)principal).getUsername();} else {  String username = principal.toString();}

登陆后操作

public class AuthenticationSuccessHandler extends SavedRequestAwareAuthenticationSuccessHandler {

登陆是操作(如添加验证码)

public class validateCodeUsernamePasswordAuthenticationFilter extends UsernamePasswordAuthenticationFilter{