springcloud微服务基于redis集群的单点登录实现解析

简介

本文介绍微服务架构中如何实现单点登录功能

创建三个服务：

• 操作redis集群的服务，用于多个服务之间共享数据
• 统一认证中心服务，用于整个系统的统一登录认证
• 服务消费者，用于测试单点登录

大体思路：每个服务都设置一个拦截器检查cookie中是否有token,若有token,则放行，若没有token,重定向到统一认证中心服务进行登录，登录成功后返回到被拦截的服务。

搭建redis集群服务

搭建redis集群参考文档

搭建统一认证中心

主函数添加注解

/**
* 单点登录既要注册到服务注册中心，又要向redis服务系统获取鼓舞
* 所以要添加 @EnableDiscoveryClient  @EnableEurekaClient 两个注解
*
*/
@EnableDiscoveryClient
@EnableEurekaClient
@EnableFeignClients
@MapperScan(basePackages = "com.example.itokenservicesso.mapper")
@SpringBootApplication
public class ItokenServiceSsoApplication {
public static void main(String[] args) {
SpringApplication.run(ItokenServiceSsoApplication.class, args);
}
}

消费redis服务和熔断器

@FeignClient(value = "itoken-service-redis", fallback = RedisServiceFallBack.class)
public interface RedisService {

@PostMapping(value = "put")
public String put(@RequestParam(value = "key") String key, @RequestParam(value = "value") String value, @RequestParam(value = "seconds") long seconds);

@GetMapping(value = "get")
public String get(@RequestParam(value = "key") String key);

}

@Component
public class RedisServiceFallBack implements RedisService {
@Override
public String put(String key, String value, long seconds) {
return FallBack.badGateWay();
}

@Override
public String get(String key) {
return FallBack.badGateWay();
}
}

public class FallBack {

public static String badGateWay(){
try {
return JsonUtil.objectToString(ResultUtil.error(502,"内部错误"));
} catch (JsonProcessingException e) {
e.printStackTrace();
}
return null;
}
}

登录服务

@Service
public class LoginServiceImpl implements LoginService {
@Autowired
private UserMapper userMapper;
@Autowired
private RedisService redisService;
@Override
public User login(String loginCode, String plantPassword) {
//从缓存中获取登录用户的数据
String json = redisService.get(loginCode);
User user = null;
//如果缓存中没有数据,从数据库取数据
if (json == null) {
user = userMapper.selectAll(loginCode);
String passwordMd5 = DigestUtils.md5DigestAsHex(plantPassword.getBytes());
if (user != null && passwordMd5.equals(user.getPassword())) {
//登录成功，刷新缓存
try {
redisService.put(loginCode, JsonUtil.objectToString(user), 60 * 60 * 24);
} catch (JsonProcessingException e) {
e.printStackTrace();
}
return user;
} else {
return null;
}
}
//如果缓存中有数据
else {
try {
user = JsonUtil.stringToObject(json, User.class);
} catch (IOException e) {
e.printStackTrace();
}
}
return user;
}
}

contoller层，处理登录业务和登录跳转

登录业务

/**
* 登录业务
*
* @param loginCode
* @param password
* @return
*/
@PostMapping("login")
public String login(String loginCode,
String password,
@RequestParam(required = false) String url,
HttpServletRequest request,
HttpServletResponse response,
RedirectAttributes redirectAttributes) {
User user = loginService.login(loginCode, password);
//登录成功
if (user != null) {

String token = UUID.randomUUID().toString();
//将token放入缓存
String result = redisService.put(token, loginCode, 60 * 60 * 24);
//如果redisService没有熔断，也就是返回ok,才能执行
if (result != null && result.equals("ok")) {
CookieUtil.setCookie(response, "token", token, 60 * 60 * 24);
if (url != null && !url.trim().equals(""))
return "redirect:" + url;
}
//熔断后返回错误提示
else {
redirectAttributes.addFlashAttribute("message", "服务器异常");
}

}
//登录失败
else {
redirectAttributes.addFlashAttribute("message", "用户名或密码错误");
}
return "redirect:/login";
}

登录跳转

@Autowired
private LoginService loginService;

@Autowired
private RedisService redisService;

/**
* 跳转登录页
*/
@GetMapping("login")
public String login(HttpServletRequest request,
Model model,
@RequestParam(required = false) String url
) {
String token = CookieUtil.getCookie(request, "token");
//token不为空可能已登录,从redis获取账号
if (token != null && token.trim().length() != 0) {
String loginCode = redisService.get(token);
//如果账号不为空，从redis获取该账号的个人信息
if (loginCode != null && loginCode.trim().length() != 0) {
String json = redisService.get(loginCode);
if (json != null && json.trim().length() != 0) {
try {
User user = JsonUtil.stringToObject(json, User.class);

//已登录
if (user != null) {
if (url != null && url.trim().length() != 0) {
return "redirect:" + url;
}
}
//将登录信息传到登录页
model.addAttribute("user", user);

} catch (IOException e) {
e.printStackTrace();
}

}
}
}
return "login";
}

搭建服务消费者：添加一个拦截器，判断token是否为空

拦截器

public class WebAdminInterceptor implements HandlerInterceptor {
@Autowired
private RedisService redisService;
@Override
public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
String token = CookieUtil.getCookie(request, "token");
//token为空，一定没有登录
if (token == null || token.isEmpty()) {
response.sendRedirect("http://localhost:8503/login?url=http://localhost:8601/login");
return false;
}
return true;
}
@Override
public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
HttpSession session = request.getSession();
User user = (User) session.getAttribute("user");
//已登陆状态
if (user != null) {
if (modelAndView != null) {
modelAndView.addObject("user", user);
}
}
//未登录状态
else {
String token = CookieUtil.getCookie(request, "token");
if (token != null && !token.isEmpty()) {
String loginCode = redisService.get(token);

if (loginCode != null && !loginCode.isEmpty()) {
String json = redisService.get(loginCode);
if (json != null && !json.isEmpty()) {
//已登录状态，创建局部会话
user = JsonUtil.stringToObject(json, User.class);
if (modelAndView != null) {
modelAndView.addObject("user", user);
}
request.getSession().setAttribute("user", user);
}
}
}
}

//二次确认是否有用户信息
if (user == null) {
response.sendRedirect("http://localhost:8503/login?url=http://localhost:8601/login");

}
}
@Override
public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {

}
}

配置拦截器

@Configuration
public class WebAdminInterceptorConfig implements WebMvcConfigurer {

//将拦截器设置为Bean,在拦截其中才能使用@AutoWired注解自动注入
@Bean
WebAdminInterceptor webAdminInterceptor() {
return new WebAdminInterceptor();
}

@Override
public void addInterceptors(InterceptorRegistry registry) {
registry.addInterceptor(webAdminInterceptor())
.addPathPatterns("/**")
.excludePathPatterns("/static");
}
}

任意写一个接口,触发拦截器进行测试

@RequestMapping(value = {"/login"})
public String index(){
return "index";
}

以上就是本文的全部内容，希望对大家的学习有所帮助

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