springboot cas单点登录 302跨域 代码编写方法 具体

回答：可以通过配置跨域过滤器来解决302跨域问题。具体的代码编写方法可以参考以下步骤：

1. 在Spring Boot项目中添加依赖：spring-boot-starter-security和spring-security-cas。

2. 在application.properties文件中添加CAS服务器的相关配置信息，例如：

cas.server.host=https://cas.example.com
cas.server.login_url=https://cas.example.com/login
cas.server.logout_url=https://cas.example.com/logout
cas.server.validate_url=https://cas.example.com/serviceValidate

3. 创建一个CAS认证过滤器，代码如下：

@Configuration
public class CasSecurityConfig extends WebSecurityConfigurerAdapter {

@Autowired
private CasAuthenticationEntryPoint casAuthenticationEntryPoint;

@Autowired
private CasAuthenticationProvider casAuthenticationProvider;

@Autowired
private CasLogoutSuccessHandler casLogoutSuccessHandler;

@Autowired
private CasAuthenticationFilter casAuthenticationFilter;

@Override
protected void configure(HttpSecurity http) throws Exception {
http
.authorizeRequests()
.antMatchers("/login").permitAll()
.anyRequest().authenticated()
.and()
.exceptionHandling()
.authenticationEntryPoint(casAuthenticationEntryPoint)
.and()
.logout()
.logoutSuccessHandler(casLogoutSuccessHandler)
.and()
.addFilter(casAuthenticationFilter);
}

@Bean
public ServiceProperties serviceProperties() {
ServiceProperties serviceProperties = new ServiceProperties();
serviceProperties.setService("http://localhost:8080/login/cas");
serviceProperties.setSendRenew(false);
return serviceProperties;
}

@Bean
public CasAuthenticationEntryPoint casAuthenticationEntryPoint(ServiceProperties serviceProperties) {
CasAuthenticationEntryPoint casAuthenticationEntryPoint = new CasAuthenticationEntryPoint();
casAuthenticationEntryPoint.setLoginUrl("https://cas.example.com/login");
casAuthenticationEntryPoint.setServiceProperties(serviceProperties);
return casAuthenticationEntryPoint;
}

@Bean
public CasAuthenticationProvider casAuthenticationProvider() {
CasAuthenticationProvider casAuthenticationProvider = new CasAuthenticationProvider();
casAuthenticationProvider.setTicketValidator(new Cas30ServiceTicketValidator("https://cas.example.com"));
casAuthenticationProvider.setServiceProperties(serviceProperties());
casAuthenticationProvider.setUserDetailsService(userDetailsService());
casAuthenticationProvider.setKey("casAuthProviderKey");
return casAuthenticationProvider;
}

@Bean
public CasLogoutSuccessHandler casLogoutSuccessHandler() {
CasLogoutSuccessHandler casLogoutSuccessHandler = new CasLogoutSuccessHandler();
casLogoutSuccessHandler.setDefaultTargetUrl("http://localhost:8080/logout");
return casLogoutSuccessHandler;
}

@Bean
public CasAuthenticationFilter casAuthenticationFilter(AuthenticationManager authenticationManager) {
CasAuthenticationFilter casAuthenticationFilter = new CasAuthenticationFilter();
casAuthenticationFilter.setAuthenticationManager(authenticationManager);
return casAuthenticationFilter;
}

@Override
protected void configure(AuthenticationManagerBuilder auth) throws Exception {
auth.authenticationProvider(casAuthenticationProvider());
}
}

4. 在Controller中添加登录和注销的方法，例如：

@Controller
public class LoginController {

@RequestMapping("/login")
public String login() {
return "redirect:/login/cas";
}

@RequestMapping("/logout")
public String logout() {
return "redirect:https://cas.example.com/logout";
}
}

5. 在页面中添加登录和注销的链接，例如：

<a href="/login">登录</a>
<a href="/logout">注销</a>

以上就是使用Spring Boot和CAS实现单点登录的代码编写方法。