标签:style class blog code java http
这里给出一个简单的安全验证的实现例子,先说一下需求:
1.通过登录页面进行登录
2.用户登录前访问被保护的地址时自动跳转到登录页面
3.用户信息存储在数据表中
4.用户权限信息存在在数据表中
5.用户登录成功后访问没有权限访问的地址时跳转到登录页面
ok,以上就是一个基本的需求了,大部分的系统都是基于该需求实现登录模块的。
给出实现之前,先简单说明一下springsecurity的原理,
1.AccessDecisionManager
和我们一般实现登录验证采用filter的方式一样,springsecurity也是一个过滤器,当请求被springsecurity拦截后,会先对用户请求的资源进行安全认证,如果用户有权访问该资源,则放行,否则将阻断用户请求或提供用户登录,
在springsecurity中,负责对用户的请求资源进行安全认证的是AccessDecisionManager,它就是一组投票器的集合,默认的策略是使用一个AffirmativeBased,既只要有一个投票器通过验证就允许用户访问,
所以如果希望实现自己的权限验证策略,实现自己的投票器是一个很好的选择。
2.UserDetailsService
如果用户没有登录就访问某一个受保护的资源,则springsecurity会提示用户登录,用户登录后,由UserDetailsService来验证用户是否合法,既验证用户名和密码是否正确,同时验证用户是否具备相应的资源权限,
即对应的access的value。
如果用户验证通过,则由AccessDecisionManager来决定是否用户可以访问该资源。
下面给出具体实现:
web.xml
基本上都是这样配置,就不废话了。
Xml代码
- <</span> filter >
- <</span> filter-name > springSecurityFilterChain </</span> filter-name >
- <</span> filter-class > org.springframework.web.filter.DelegatingFilterProxy </</span> filter-class>
- </</span> filter >
- <</span> filter-mapping >
- <</span> filter-name > springSecurityFilterChain </</span> filter-name >
- <</span> url-pattern > *.do*" access = "HODLE" />
- <</span> logout logout-url = "/logout.do" invalidate-session = "true"
- logout-success-url = "/logout.jsp" />
- <</span> form-login login-page = "/index.do" default-target-url = "/frame.do"
- always-use-default-target = "true" authentication-failure-url = "/index.do?login_error=1" />
- <</span> session-management >
- <</span> concurrency-control max-sessions = "1" />
- </</span> session-management >
- </</span> http >
- <</span> beans:bean id = "loggerListener"
- class = "org.springframework.security.authentication.event.LoggerListener" />
- <</span> authentication-manager >
- <</span> authentication-provider user-service-ref = "userService" >
- <</span> password-encoder hash = "md5" />
- </</span> authentication-provider >
- </</span> authentication-manager >
- <</span> beans:bean id = "userService" class = "com.piaoyi.common.security.UserService" />
- <</span> beans:bean id = "accessDecisionManager"
- class = "org.springframework.security.access.vote.AffirmativeBased" >
- <</span> beans:property name = "decisionVoters" >
- <</span> beans:list >
- <</span> beans:bean class = "org.springframework.security.access.vote.RoleVoter" />
- <</span> beans:bean
- class = "org.springframework.security.access.vote.AuthenticatedVoter" />
- <</span> beans:bean class = "com.piaoyi.common.security.DynamicRoleVoter" />
- </</span> beans:list >
- </</span> beans:property >
- </</span> beans:bean >
- </</span> beans:beans >
UserService.java
Java代码
- public class UserService implements UserDetailsService{
- @Autowired
- private ISystemUserService userService;
- @Override
- public UserDetails loadUserByUsername(String username)
- throws UsernameNotFoundException {
- // TODO Auto-generated method stub
- SystemUser user = userService.findById(username);
- if (user == null )
- throw new UsernameNotFoundException( "The user name " + username
- + " can not be found!" );
- List resultAuths = new ArrayList();
- //增加access中配置的权限,实际上这里就是让所有登陆用户都具备该权限,
- //而真正的资源权限验证留给AccessDecisionManager来决定
- resultAuths.add(new GrantedAuthorityImpl( "HODLE" ));
- //验证用户名和密码是否正确,以及是否权限正确
- return new User(username, user.getPassword().toLowerCase(), user.isStatus(), true ,
- true , true , resultAuths);
- }
- }
DynamicRoleVoter.java
Java代码
- public class DynamicRoleVoter implements
- AccessDecisionVoter {
- @Autowired
- private ISystemUserService userService;
- private PathMatcher pathMatcher = new AntPathMatcher();
- @SuppressWarnings ( "unchecked" )
- public boolean supports(Class clazz) {
- return true ;
- }
- public boolean supports(ConfigAttribute attribute) {
- return true ;
- }
- public int vote(Authentication authentication, Object object,
- java.util.Collection arg2) {
- int result = ACCESS_ABSTAIN;
- if (!(object instanceof FilterInvocation))
- return result;
- FilterInvocation invo = (FilterInvocation) object;
- String url = invo.getRequestUrl();//当前请求的URL
- Set authorities = null ;
- String userId = authentication.getName();
- //获得当前用户的可访问资源,自定义的查询方法,之后和当前请求资源进行匹配,成功则放行,否则拦截
- authorities = loadUserAuthorities(userService.findById(userId));
- Map> urlAuths = authService.getUrlAuthorities();
- Set keySet = urlAuths.keySet();
- for (String key : keySet) {
- boolean matched = pathMatcher.match(key, url);
- if (!matched)
- continue ;
- Set mappedAuths = urlAuths.get(key);
- if (contain(authorities, mappedAuths)) {
- result = ACCESS_GRANTED;
- break ;
- }
- }
- return result;
- }
- protected boolean contain(Set authorities,
- Set mappedAuths) {
- if (CollectionUtils.isEmpty(mappedAuths)
- || CollectionUtils.isEmpty(authorities))
- return false ;
- for (GrantedAuthority item : authorities) {
- if (mappedAuths.contains(item.getAuthority()))
- return true ;
- }
- return false ;
- }
- }
SpringSecurity3.X权限原理(转),布布扣,bubuko.com
SpringSecurity3.X权限原理(转)
标签:style class blog code java http
原文地址:http://www.cnblogs.com/cmzcheng/p/3807339.html