【SpringSecurity】十三、基于Session实现授权认证

悠悠 2024-04-23 15:47 84阅读 0赞

#### 文章目录 ####

*  1、基于session的认证
 *  2、Demo
 *   *  session实现认证
     *  session实现授权

## 1、基于session的认证 ##

![在这里插入图片描述][b7f6a7fc60934369aa56823573416862.png]  
流程：

*  用户认证成功后，服务端生成用户数据保存在session中
 *  服务端返回给客户端session id (sid），被客户端存到自己的cookie中
 *  客户端下次再请求，就带上sid，服务端校验是否存在对应的session，存在则不要求用户再登录了

## 2、Demo ##

基于Session的认证机制由Servlet制定规范，Serlvet容器以实现，HttpSession相关方法：

<table> 
 <thead> 
  <tr> 
   <th>方法</th> 
   <th>用途</th> 
  </tr> 
 </thead> 
 <tbody> 
  <tr> 
   <td>HttpSession getSession(Boolean create)</td> 
   <td>获取当前HttpSession对象</td> 
  </tr> 
  <tr> 
   <td>void setAttribute(String name,Object value)</td> 
   <td>向session中存放对象</td> 
  </tr> 
  <tr> 
   <td>object getAttribute(String name)</td> 
   <td>从session中获取对象</td> 
  </tr> 
  <tr> 
   <td>void removeAttribute(String name);</td> 
   <td>移除session中对象</td> 
  </tr> 
  <tr> 
   <td>void invalidate()</td> 
   <td>使HttpSession失效</td> 
  </tr> 
 </tbody> 
</table>

准备实体类：

@Data
    public class AuthenticationRequestDto {
        
        /**
         * 用户名
         */
        private String username;
        /**
         * 密码
         */
        private String password;
    }

@Data
    @AllArgsConstructor
    public class UserVo {
        
    
        private String id;
        private String username;
        private String password;
        private String fullname;
        private String mobile;
    }

### session实现认证 ###

用Map模拟查询数据库，存储用户信息：

@Service
    public class AuthenticationServiceImpl implements AuthenticationService {
        
    
        private final Map<String, UserVo> userMap = new HashMap<>();
    
        {
        
            userMap.put("zhangsan", new UserVo("1010", "zhangsan", "123", "zhangSan", "133443"));
            userMap.put("lisi", new UserVo("1011", "lisi", "456", "liSi", "144553"));
        }
    
        @Override
        public UserVo auth(AuthenticationRequestDto dto) {
        
    
            if (dto == null
                    || StringUtils.isEmpty(dto.getUsername())
                    || StringUtils.isEmpty(dto.getPassword())) {
        
                throw new RuntimeException("账户或密码为空");
            }
            //模拟查询数据库
            UserVo vo = getUserVo(dto.getUsername());
            if (null == vo) {
        
                throw new RuntimeException("用户不存在");
            }
            if (!vo.getPassword().equals(dto.getPassword())) {
        
                throw new RuntimeException("密码错误");
            }
            return vo;
        }
    
        public UserVo getUserVo(String username) {
        
            return userMap.get(username);
        }
    
    }

定义三个接口，登录，服务端保存session，登出，让session失效。以及一个资源接口，查看当前是登录访问资源，还是未登录访问资源

@RestController
    public class Controller {
        
    
        @Resource
        private AuthenticationService authenticationService;
    
        @GetMapping(value = "/login")
        public String login(AuthenticationRequestDto dto, HttpSession session) {
        
            UserVo userVo = authenticationService.auth(dto);
            //用户信息存入session
            session.setAttribute("sid", userVo);
            return userVo.getFullname() + " success login";
        }
    
        @GetMapping("/logout")
        public String logout(HttpSession session) {
        
        	//让session失效
            session.invalidate();
            return " success logout";
        }
    
        @GetMapping("/r1")
        public String resource(HttpSession session) {
        
            String fullName = null;
            Object result = session.getAttribute("sid");
            if (result != null) {
        
                fullName = ((UserVo) result).getFullname();
            } else {
        
                fullName = "no login";
            }
            return fullName + " access resource ... ";
        }
    
    }

测试：

![在这里插入图片描述][3bc899660fff45299d2066f8fb8e39b0.png]

登录后访问资源接口：

![在这里插入图片描述][6975733497f642bcaf3db8d6ec1eb8d1.png]  
退出登录后，再访问资源接口：

![在这里插入图片描述][3ce4562da5f8465b85238303fc337200.png]  
![在这里插入图片描述][6c6a18b51bc643188d868ec4f4a6e9e1.png]

### session实现授权 ###

修改实体类，加个权限字段，存储用户权限

@Data
    @AllArgsConstructor
    public class UserVo {
        
    
        private String id;
        private String username;
        private String password;
        private String fullname;
        private String mobile;
    
        /**
         * 用户权限
         */
        private Set<String> authorities;
    }

实例代码块创建用户到map的代码做调整：

{
        
            Set<String> auth1 = new HashSet<>();
            auth1.add("p1");   //对应/r1这个接口资源
            Set<String> auth2 = new HashSet<>();
            auth2.add("p2");   //对应/r2这个接口资源
            userMap.put("zhangsan", new UserVo("1010", "zhangsan", "123", "zhangSan", "133443", auth1));
            userMap.put("lisi", new UserVo("1011", "lisi", "456", "liSi", "144553", auth2));
        }

加个测试资源接口/r2

@GetMapping("/r2")
        public String resource2(HttpSession session) {
        
            String fullName = null;
            Object result = session.getAttribute("sid");
            if (result != null) {
        
                fullName = ((UserVo) result).getFullname();
            } else {
        
                fullName = "no login";
            }
            return fullName + " access resource ... ";
        }

写拦截器：

@ComponentScan
    public class SimpleAuthInterceptor implements HandlerInterceptor {
        
    
        /**
         * 校验用户请求的url是否在权限范围中
         */
        @Override
        public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        
    		//从http请求中获取session对象，再拿当前HttpSession对象
            Object object = request.getSession().getAttribute("sid");
            //没有认证
            if (object == null) {
        
                writeContent(response, "请登录");
            }
            UserVo userVo = (UserVo) object;
            //请求的url
            String requestURI = request.getRequestURI();
            assert userVo != null;
            if (userVo.getAuthorities().contains("p1") && requestURI.contains("/r1")) {
        
                return true;
            }
            if (userVo.getAuthorities().contains("p2") && requestURI.contains("/r2")) {
        
                return true;
            }
            //拒绝访问
            writeContent(response,"没有权限，拒绝访问");
    
            return false;
        }
    
        private void writeContent(HttpServletResponse response, String msg) throws IOException {
        
            response.setContentType("text/html;charset=utf-8");
            PrintWriter writer = response.getWriter();
            writer.print(msg);
            writer.close();
        }
    }

拦截器add并放行/login，只测/r\*\*接口

@Configuration
    @EnableWebMvc
    public class WebConfig implements WebMvcConfigurer {
        
    
        /**
         * 视图解析器
         */
        @Bean
        public InternalResourceViewResolver viewResolver(){
        
           InternalResourceViewResolver viewResolver = new InternalResourceViewResolver();
           viewResolver.setPrefix("/static/");  //前缀
           viewResolver.setSuffix(".jsp");  //后缀
           return viewResolver;
        }
    
        @Override
        public void addViewControllers(ViewControllerRegistry registry) {
        
            registry.addViewController("/").setViewName("login");
        }
    
        @Override
        public void addInterceptors(InterceptorRegistry registry) {
        
            registry.addInterceptor(new SimpleAuthInterceptor()).addPathPatterns("/r**");   //新加进来的拦截器只针对r打头的接口，否则login接口也会被拦截要求登录
        }
    }

测试，登录zhangsan，其有r1权限，访问r2接口：

![在这里插入图片描述][b6b0f5ad891c40daa21b2984d6ff2e01.png]

[b7f6a7fc60934369aa56823573416862.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/04/23/adf9b5480cf44ff3a9c867504fd44b52.png
[3bc899660fff45299d2066f8fb8e39b0.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/04/23/261a7a9f9de44f28b9a6b12a882d6d13.png
[6975733497f642bcaf3db8d6ec1eb8d1.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/04/23/10c16559645546719ace7ae88332d575.png
[3ce4562da5f8465b85238303fc337200.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/04/23/40d8ebb2731b4d1d960ac09228a47b83.png
[6c6a18b51bc643188d868ec4f4a6e9e1.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/04/23/c08daee9efba4d14b31f2d31a4ac4766.png
[b6b0f5ad891c40daa21b2984d6ff2e01.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/04/23/3d8f41fba4ed4507b2b5cff3f2dc26b7.png