针对cas实现单点登录主要是两个部分，一个部分是client，一个部分是server。对于client，我们实现的时候需要在自己的项目中引入相应的jar包，然后增加相应的配置，并且实现相应的过滤器即可。而针对server，目前在cas的官网上下载的server都是springmvc的工程，所以建议直接下载使用，并且根据自己的需要进行修改配置，而不建议将server工程修改成springBoot工程。
（1）添加相应的maven依赖
<dependency>
<groupid>org.jasig.cas.client/<groupid>
<artifactid>cas-client-core/<artifactid>
<version>3.3.3/<version>
/<dependency>
（2）在application.properties中增加配置项
#cas config
spring.cas.sign-out-filters=/logout
spring.cas.auth-filters=/*
spring.cas.validate-filters=/*
spring.cas.request-wrapper-filters=/*
spring.cas.assertion-filters=/*
spring.cas.cas-server-login-url=http://localhost:8080/login
spring.cas.cas-server-url-prefix=http://localhost:8080
spring.cas.redirect-after-validation=true
spring.cas.use-session=true
spring.cas.server-name=http://localhost:8001
注意上面的spring.cas.cas-server-login-url是登录地址的url，spring.cas.cas-server-url-prefix是登录地址的IP，spring.cas.server-name是添加单点登录服务的IP。
（3）添加cas自动配置项
import org.springframework.boot.context.properties.ConfigurationProperties;
import java.util.Arrays;
import java.util.List;
@ConfigurationProperties(prefix = "spring.cas")
public class SpringCasAutoconfig {
static final String separator = ",";
private String validateFilters;
private String signOutFilters;
private String authFilters;
private String assertionFilters;
private String requestWrapperFilters;
private String casServerUrlPrefix;
private String casServerLoginUrl;
private String serverName;
private boolean useSession = true;
private boolean redirectAfterValidation = true;
public List<string> getValidateFilters() {
return Arrays.asList(validateFilters.split(separator));
}
public void setValidateFilters(String validateFilters) {
this.validateFilters = validateFilters;
}
public List<string> getSignOutFilters() {
return Arrays.asList(signOutFilters.split(separator));
}
public void setSignOutFilters(String signOutFilters) {
this.signOutFilters = signOutFilters;
}
public List<string> getAuthFilters() {
return Arrays.asList(authFilters.split(separator));
}
public void setAuthFilters(String authFilters) {
this.authFilters = authFilters;
}
public List<string> getAssertionFilters() {
return Arrays.asList(assertionFilters.split(separator));
}
public void setAssertionFilters(String assertionFilters) {
this.assertionFilters = assertionFilters;
}
public List<string> getRequestWrapperFilters() {
return Arrays.asList(requestWrapperFilters.split(separator));
}
public void setRequestWrapperFilters(String requestWrapperFilters) {
this.requestWrapperFilters = requestWrapperFilters;
}
public String getCasServerUrlPrefix() {
return casServerUrlPrefix;
}
public void setCasServerUrlPrefix(String casServerUrlPrefix) {
this.casServerUrlPrefix = casServerUrlPrefix;
}
public String getCasServerLoginUrl() {
return casServerLoginUrl;
}
public void setCasServerLoginUrl(String casServerLoginUrl) {
this.casServerLoginUrl = casServerLoginUrl;
}
public String getServerName() {
return serverName;
}
public void setServerName(String serverName) {
this.serverName = serverName;
}
public boolean isRedirectAfterValidation() {
return redirectAfterValidation;
}
public void setRedirectAfterValidation(boolean redirectAfterValidation) {
this.redirectAfterValidation = redirectAfterValidation;
}
public boolean isUseSession() {
return useSession;
}
public void setUseSession(boolean useSession) {
this.useSession = useSession;
}
}
/<string>/<string>/<string>/<string>/<string>
（4）增加需要的过滤器
import org.jasig.cas.client.authentication.AuthenticationFilter;
import org.jasig.cas.client.session.SingleSignOutFilter;
import org.jasig.cas.client.session.SingleSignOutHttpSessionListener;
import org.jasig.cas.client.util.AssertionThreadLocalFilter;
import org.jasig.cas.client.util.HttpServletRequestWrapperFilter;
import org.jasig.cas.client.validation.Cas20ProxyReceivingTicketValidationFilter;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.web.servlet.FilterRegistrationBean;
import org.springframework.boot.web.servlet.ServletListenerRegistrationBean;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.security.web.authentication.logout.LogoutFilter;
import org.springframework.security.web.authentication.logout.SecurityContextLogoutHandler;
@Configuration
public class CasConfig {
@Autowired
SpringCasAutoconfig autoconfig;
private static boolean casEnabled = true;
public CasConfig() {
}
@Bean
public SpringCasAutoconfig getSpringCasAutoconfig(){
return new SpringCasAutoconfig();
}
/**
* 用于实现单点登出功能
*/
@Bean
public ServletListenerRegistrationBean<singlesignouthttpsessionlistener> singleSignOutHttpSessionListener() {
ServletListenerRegistrationBean<singlesignouthttpsessionlistener> listener = new ServletListenerRegistrationBean<>();
listener.setEnabled(casEnabled);
listener.setListener(new SingleSignOutHttpSessionListener());
listener.setOrder(1);
return listener;
}
/**
* 该过滤器用于实现单点登出功能，单点退出配置，一定要放在其他filter之前
*/
@Bean
public FilterRegistrationBean logOutFilter() {
FilterRegistrationBean filterRegistration = new FilterRegistrationBean();
LogoutFilter logoutFilter = new LogoutFilter(autoconfig.getCasServerUrlPrefix() + "/logout?service=" + autoconfig.getServerName(),new SecurityContextLogoutHandler());
filterRegistration.setFilter(logoutFilter);
filterRegistration.setEnabled(casEnabled);
if(autoconfig.getSignOutFilters().size()>0)
filterRegistration.setUrlPatterns(autoconfig.getSignOutFilters());
else
filterRegistration.addUrlPatterns("/logout");
filterRegistration.addInitParameter("casServerUrlPrefix", autoconfig.getCasServerUrlPrefix());
filterRegistration.addInitParameter("serverName", autoconfig.getServerName());
filterRegistration.setOrder(2);
return filterRegistration;
}
/**
* 该过滤器用于实现单点登出功能，单点退出配置，一定要放在其他filter之前
*/
@Bean
public FilterRegistrationBean singleSignOutFilter() {
FilterRegistrationBean filterRegistration = new FilterRegistrationBean();
filterRegistration.setFilter(new SingleSignOutFilter());
filterRegistration.setEnabled(casEnabled);
if(autoconfig.getSignOutFilters().size()>0)
filterRegistration.setUrlPatterns(autoconfig.getSignOutFilters());
else
filterRegistration.addUrlPatterns("/*");
filterRegistration.addInitParameter("casServerUrlPrefix", autoconfig.getCasServerUrlPrefix());
filterRegistration.addInitParameter("serverName", autoconfig.getServerName());
filterRegistration.setOrder(3);
return filterRegistration;
}
/**
* 该过滤器负责用户的认证工作
*/
@Bean
public FilterRegistrationBean authenticationFilter() {
FilterRegistrationBean filterRegistration = new FilterRegistrationBean();
filterRegistration.setFilter(new AuthenticationFilter());
filterRegistration.setEnabled(casEnabled);
if(autoconfig.getAuthFilters().size()>0)
filterRegistration.setUrlPatterns(autoconfig.getAuthFilters());
else
filterRegistration.addUrlPatterns("/*");
//casServerLoginUrl:cas服务的登陆url
filterRegistration.addInitParameter("casServerLoginUrl", autoconfig.getCasServerLoginUrl());
//本项目登录ip+port
filterRegistration.addInitParameter("serverName", autoconfig.getServerName());
filterRegistration.addInitParameter("useSession", autoconfig.isUseSession()?"true":"false");
filterRegistration.addInitParameter("redirectAfterValidation", autoconfig.isRedirectAfterValidation()?"true":"false");
filterRegistration.setOrder(4);
return filterRegistration;
}
/**
* 该过滤器负责对Ticket的校验工作
*/
@Bean
public FilterRegistrationBean cas20ProxyReceivingTicketValidationFilter() {
FilterRegistrationBean filterRegistration = new FilterRegistrationBean();
Cas20ProxyReceivingTicketValidationFilter cas20ProxyReceivingTicketValidationFilter = new Cas20ProxyReceivingTicketValidationFilter();
cas20ProxyReceivingTicketValidationFilter.setServerName(autoconfig.getServerName());
filterRegistration.setFilter(cas20ProxyReceivingTicketValidationFilter);
filterRegistration.setEnabled(casEnabled);
if(autoconfig.getValidateFilters().size()>0)
filterRegistration.setUrlPatterns(autoconfig.getValidateFilters());
else
filterRegistration.addUrlPatterns("/*");
filterRegistration.addInitParameter("casServerUrlPrefix", autoconfig.getCasServerUrlPrefix());
filterRegistration.addInitParameter("serverName", autoconfig.getServerName());
filterRegistration.setOrder(5);
return filterRegistration;
}
/**
* 该过滤器对HttpServletRequest请求包装， 可通过HttpServletRequest的getRemoteUser()方法获得登录用户的登录名
*
*/
@Bean
public FilterRegistrationBean httpServletRequestWrapperFilter() {
FilterRegistrationBean filterRegistration = new FilterRegistrationBean();
filterRegistration.setFilter(new HttpServletRequestWrapperFilter());
filterRegistration.setEnabled(true);
if(autoconfig.getRequestWrapperFilters().size()>0)
filterRegistration.setUrlPatterns(autoconfig.getRequestWrapperFilters());
else
filterRegistration.addUrlPatterns("/login");
filterRegistration.setOrder(6);
return filterRegistration;
}
/**
* 该过滤器使得可以通过org.jasig.cas.client.util.AssertionHolder来获取用户的登录名。
比如AssertionHolder.getAssertion().getPrincipal().getName()。
这个类把Assertion信息放在ThreadLocal变量中，这样应用程序不在web层也能够获取到当前登录信息
*/
@Bean
public FilterRegistrationBean assertionThreadLocalFilter() {
FilterRegistrationBean filterRegistration = new FilterRegistrationBean();
filterRegistration.setFilter(new AssertionThreadLocalFilter());
filterRegistration.setEnabled(true);
if(autoconfig.getAssertionFilters().size()>0)
filterRegistration.setUrlPatterns(autoconfig.getAssertionFilters());
else
filterRegistration.addUrlPatterns("/*");
filterRegistration.setOrder(7);
return filterRegistration;
}
}
/<singlesignouthttpsessionlistener>/<singlesignouthttpsessionlistener>
至此就完成了SpringBoot集成cas客户端，详细代码可参考gitHub地址：springboot-cas client