Spring Security(3) 动态url权限控制

迈不过友情╰ 2023-06-09 03:52 167阅读 0赞

### 一、前言 ###

本篇文章将讲述`Spring Security 动态分配url权限，未登录权限控制，登录过后根据登录用户角色授予访问url权限`

###### 基本环境 ######

1.  spring-boot 2.1.8
2.  mybatis-plus 2.2.0
3.  mysql 数据库
4.  maven项目

###### Spring Security入门学习可参考之前文章： ######

1.  SpringBoot集成Spring Security入门体验（一）  
    [https://blog.csdn.net/qq\_38225558/article/details/101754743][https_blog.csdn.net_qq_38225558_article_details_101754743]
2.  Spring Security 自定义登录认证（二）  
    [https://blog.csdn.net/qq\_38225558/article/details/102542072][https_blog.csdn.net_qq_38225558_article_details_102542072]

### 二、数据库建表 ###

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly96aGVuZ3FpbmcuYmxvZy5jc2RuLm5ldA_size_16_color_FFFFFF_t_70]

###### 表关系简介： ######

1.  用户表`t_sys_user` 关联 角色表`t_sys_role` 两者建立中间关系表`t_sys_user_role`
2.  角色表`t_sys_role` 关联 权限表`t_sys_permission` 两者建立中间关系表`t_sys_role_permission`
3.  最终体现效果为当前登录用户所具备的角色关联能访问的所有url，只要给角色分配相应的url权限即可

> **温馨小提示**：这里逻辑根据个人业务来定义，小编这里讲解案例只给用户对应的角色分配访问权限，像其它的 直接给用户分配权限等等可以自己实现

###### 表模拟数据如下： ######

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly96aGVuZ3FpbmcuYmxvZy5jc2RuLm5ldA_size_16_color_FFFFFF_t_70 1]

### 三、Spring Security 动态权限控制 ###

#### 1、未登录访问权限控制 ####

自定义`AdminAuthenticationEntryPoint`类实现`AuthenticationEntryPoint`类

这里是认证权限入口 -> 即在未登录的情况下访问所有接口都会拦截到此（除了放行忽略接口）

> **温馨小提示**：`ResponseUtils`和`ApiResult`是小编这里模拟前后端分离情况下返回json格式数据所使用工具类，具体实现可参考文末给出的demo源码

@Component
    public class AdminAuthenticationEntryPoint implements AuthenticationEntryPoint { 
        @Override
        public void commence(HttpServletRequest request, HttpServletResponse response, AuthenticationException e) { 
            ResponseUtils.out(response, ApiResult.fail("未登录！！！"));
        }
    }

#### 2、自定义过滤器`MyAuthenticationFilter`继承`OncePerRequestFilter`实现访问鉴权 ####

每次访问接口都会经过此，我们可以在这里记录请求参数、响应内容，或者处理前后端分离情况下，以token换用户权限信息，token是否过期，请求头类型是否正确，防止非法请求等等

1.  `logRequestBody()`方法：记录请求消息体
2.  `logResponseBody()`方法：记录响应消息体

【注：请求的`HttpServletRequest流只能读一次`，下一次就不能读取了，因此这里要使用自定义的`MultiReadHttpServletRequest`工具解决流只能读一次的问题，响应同理，具体可参考文末demo源码实现】

@Slf4j
    @Component
    public class MyAuthenticationFilter extends OncePerRequestFilter { 
    
        private final UserDetailsServiceImpl userDetailsService;
    
        protected MyAuthenticationFilter(UserDetailsServiceImpl userDetailsService) { 
            this.userDetailsService = userDetailsService;
        }
    
        @Override
        protected void doFilterInternal(HttpServletRequest request, HttpServletResponse response, FilterChain filterChain) throws ServletException, IOException { 
            System.out.println("请求头类型： " + request.getContentType());
            if ((request.getContentType() == null && request.getContentLength() > 0) || (request.getContentType() != null && !request.getContentType().contains(Constants.REQUEST_HEADERS_CONTENT_TYPE))) { 
                filterChain.doFilter(request, response);
                return;
            }
    
            MultiReadHttpServletRequest wrappedRequest = new MultiReadHttpServletRequest(request);
            MultiReadHttpServletResponse wrappedResponse = new MultiReadHttpServletResponse(response);
            StopWatch stopWatch = new StopWatch();
            try { 
                stopWatch.start();
                // 记录请求的消息体
                logRequestBody(wrappedRequest);
    
    // String token = "123";
                // 前后端分离情况下，前端登录后将token储存在cookie中，每次访问接口时通过token去拿用户权限
                String token = wrappedRequest.getHeader(Constants.REQUEST_HEADER);
                log.debug("后台检查令牌:{}", token);
                if (StringUtils.isNotBlank(token)) { 
                    // 检查token
                    SecurityUser securityUser = userDetailsService.getUserByToken(token);
                    if (securityUser == null || securityUser.getCurrentUserInfo() == null) { 
                        throw new AccessDeniedException("TOKEN已过期，请重新登录！");
                    }
                    UsernamePasswordAuthenticationToken authentication = new UsernamePasswordAuthenticationToken(securityUser, null, securityUser.getAuthorities());
                    // 全局注入角色权限信息和登录用户基本信息
                    SecurityContextHolder.getContext().setAuthentication(authentication);
                }
                filterChain.doFilter(wrappedRequest, wrappedResponse);
            } finally { 
                stopWatch.stop();
                long usedTimes = stopWatch.getTotalTimeMillis();
                // 记录响应的消息体
                logResponseBody(wrappedRequest, wrappedResponse, usedTimes);
            }
    
        }
    
        private String logRequestBody(MultiReadHttpServletRequest request) { 
            MultiReadHttpServletRequest wrapper = request;
            if (wrapper != null) { 
                try { 
                    String bodyJson = wrapper.getBodyJsonStrByJson(request);
                    String url = wrapper.getRequestURI().replace("//", "/");
                    System.out.println("-------------------------------- 请求url: " + url + " --------------------------------");
                    Constants.URL_MAPPING_MAP.put(url, url);
                    log.info("`{}` 接收到的参数: {}",url , bodyJson);
                    return bodyJson;
                } catch (Exception e) { 
                    e.printStackTrace();
                }
            }
            return null;
        }
    
        private void logResponseBody(MultiReadHttpServletRequest request, MultiReadHttpServletResponse response, long useTime) { 
            MultiReadHttpServletResponse wrapper = response;
            if (wrapper != null) { 
                byte[] buf = wrapper.getBody();
                if (buf.length > 0) { 
                    String payload;
                    try { 
                        payload = new String(buf, 0, buf.length, wrapper.getCharacterEncoding());
                    } catch (UnsupportedEncodingException ex) { 
                        payload = "[unknown]";
                    }
                    log.info("`{}` 耗时:{}ms 返回的参数: {}", Constants.URL_MAPPING_MAP.get(request.getRequestURI()), useTime, payload);
                }
            }
        }
    
    }

#### 3、自定义`UserDetailsServiceImpl`实现`UserDetailsService` 和 自定义`SecurityUser`实现`UserDetails` 认证用户详情 ####

这个在上一篇文章中也提及过，但上次未做角色权限处理，这次我们来一起加上吧

@Service("userDetailsService")
    public class UserDetailsServiceImpl implements UserDetailsService { 
    
        @Autowired
        private UserMapper userMapper;
        @Autowired
        private RoleMapper roleMapper;
        @Autowired
        private UserRoleMapper userRoleMapper;
    
        /*** * 根据账号获取用户信息 * @param username: * @return: org.springframework.security.core.userdetails.UserDetails */
        @Override
        public UserDetails loadUserByUsername(String username) throws UsernameNotFoundException { 
            // 从数据库中取出用户信息
            List<User> userList = userMapper.selectList(new EntityWrapper<User>().eq("username", username));
            User user;
            // 判断用户是否存在
            if (!CollectionUtils.isEmpty(userList)) { 
                user = userList.get(0);
            } else { 
                throw new UsernameNotFoundException("用户名不存在！");
            }
            // 返回UserDetails实现类
            return new SecurityUser(user, getUserRoles(user.getId()));
        }
    
        /*** * 根据token获取用户权限与基本信息 * * @param token: * @return: com.zhengqing.config.security.dto.SecurityUser */
        public SecurityUser getUserByToken(String token) { 
            User user = null;
            List<User> loginList = userMapper.selectList(new EntityWrapper<User>().eq("token", token));
            if (!CollectionUtils.isEmpty(loginList)) { 
                user = loginList.get(0);
            }
            return user != null ? new SecurityUser(user, getUserRoles(user.getId())) : null;
        }
    
        /** * 根据用户id获取角色权限信息 * * @param userId * @return */
        private List<Role> getUserRoles(Integer userId) { 
            List<UserRole> userRoles = userRoleMapper.selectList(new EntityWrapper<UserRole>().eq("user_id", userId));
            List<Role> roleList = new LinkedList<>();
            for (UserRole userRole : userRoles) { 
                Role role = roleMapper.selectById(userRole.getRoleId());
                roleList.add(role);
            }
            return roleList;
        }
    
    }

这里再说下自定义`SecurityUser`是因为Spring Security自带的 `UserDetails` （存储当前用户基本信息） 有时候可能不满足我们的需求，因此我们可以自己定义一个来扩展我们的需求  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly96aGVuZ3FpbmcuYmxvZy5jc2RuLm5ldA_size_16_color_FFFFFF_t_70 2]  
`getAuthorities()`方法：即授予当前用户角色权限信息

@Data
    @Slf4j
    public class SecurityUser implements UserDetails { 
        /** * 当前登录用户 */
        private transient User currentUserInfo;
        /** * 角色 */
        private transient List<Role> roleList;
    
        public SecurityUser() {  }
    
        public SecurityUser(User user) { 
            if (user != null) { 
                this.currentUserInfo = user;
            }
        }
    
        public SecurityUser(User user, List<Role> roleList) { 
            if (user != null) { 
                this.currentUserInfo = user;
                this.roleList = roleList;
            }
        }
    
        /** * 获取当前用户所具有的角色 * * @return */
        @Override
        public Collection<? extends GrantedAuthority> getAuthorities() { 
            Collection<GrantedAuthority> authorities = new ArrayList<>();
            if (!CollectionUtils.isEmpty(this.roleList)) { 
                for (Role role : this.roleList) { 
                    SimpleGrantedAuthority authority = new SimpleGrantedAuthority(role.getCode());
                    authorities.add(authority);
                }
            }
            return authorities;
        }
    
        @Override
        public String getPassword() { 
            return currentUserInfo.getPassword();
        }
    
        @Override
        public String getUsername() { 
            return currentUserInfo.getUsername();
        }
    
        @Override
        public boolean isAccountNonExpired() { 
            return true;
        }
    
        @Override
        public boolean isAccountNonLocked() { 
            return true;
        }
    
        @Override
        public boolean isCredentialsNonExpired() { 
            return true;
        }
    
        @Override
        public boolean isEnabled() { 
            return true;
        }
    }

#### 4、自定义`UrlFilterInvocationSecurityMetadataSource`实现`FilterInvocationSecurityMetadataSource`重写`getAttributes()`方法 获取访问该url所需要的角色权限信息 ####

执行完之后到 下一步 `UrlAccessDecisionManager` 中认证权限

@Component
    public class UrlFilterInvocationSecurityMetadataSource implements FilterInvocationSecurityMetadataSource { 
    
        @Autowired
        PermissionMapper permissionMapper;
        @Autowired
        RolePermissionMapper rolePermissionMapper;
        @Autowired
        RoleMapper roleMapper;
    
        /*** * 返回该url所需要的用户权限信息 * * @param object: 储存请求url信息 * @return: null：标识不需要任何权限都可以访问 */
        @Override
        public Collection<ConfigAttribute> getAttributes(Object object) throws IllegalArgumentException { 
            // 获取当前请求url
            String requestUrl = ((FilterInvocation) object).getRequestUrl();
            // TODO 忽略url请放在此处进行过滤放行
            if ("/login".equals(requestUrl) || requestUrl.contains("logout")) { 
                return null;
            }
    
            // 数据库中所有url
            List<Permission> permissionList = permissionMapper.selectList(null);
            for (Permission permission : permissionList) { 
                // 获取该url所对应的权限
                if (requestUrl.equals(permission.getUrl())) { 
                    List<RoleMenu> permissions = rolePermissionMapper.selectList(new EntityWrapper<RoleMenu>().eq("permission_id", permission.getId()));
                    List<String> roles = new LinkedList<>();
                    if (!CollectionUtils.isEmpty(permissions)){ 
                        Integer roleId = permissions.get(0).getRoleId();
                        Role role = roleMapper.selectById(roleId);
                        roles.add(role.getCode());
                    }
                    // 保存该url对应角色权限信息
                    return SecurityConfig.createList(roles.toArray(new String[roles.size()]));
                }
            }
            // 如果数据中没有找到相应url资源则为非法访问，要求用户登录再进行操作
            return SecurityConfig.createList(Constants.ROLE_LOGIN);
        }
    
        @Override
        public Collection<ConfigAttribute> getAllConfigAttributes() { 
            return null;
        }
    
        @Override
        public boolean supports(Class<?> aClass) { 
            return FilterInvocation.class.isAssignableFrom(aClass);
        }
    }

#### 5、自定义`UrlAccessDecisionManager`实现`AccessDecisionManager`重写`decide()`方法 对访问url进行权限认证处理 ####

此处小编的处理逻辑是只要包含其中一个角色即可访问

@Component
    public class UrlAccessDecisionManager implements AccessDecisionManager { 
    
        /** * @param authentication: 当前登录用户的角色信息 * @param object: 请求url信息 * @param collection: `UrlFilterInvocationSecurityMetadataSource`中的getAttributes方法传来的，表示当前请求需要的角色（可能有多个） * @return: void */
        @Override
        public void decide(Authentication authentication, Object object, Collection<ConfigAttribute> collection) throws AccessDeniedException, AuthenticationException { 
            // 遍历角色
            for (ConfigAttribute ca : collection) { 
                // ① 当前url请求需要的权限
                String needRole = ca.getAttribute();
                if (Constants.ROLE_LOGIN.equals(needRole)) { 
                    if (authentication instanceof AnonymousAuthenticationToken) { 
                        throw new BadCredentialsException("未登录!");
                    } else { 
                        throw new AccessDeniedException("未授权该url！");
                    }
                }
    
                // ② 当前用户所具有的角色
                Collection<? extends GrantedAuthority> authorities = authentication.getAuthorities();
                for (GrantedAuthority authority : authorities) { 
                    // 只要包含其中一个角色即可访问
                    if (authority.getAuthority().equals(needRole)) { 
                        return;
                    }
                }
            }
            throw new AccessDeniedException("请联系管理员分配权限！");
        }
    
        @Override
        public boolean supports(ConfigAttribute configAttribute) { 
            return true;
        }
    
        @Override
        public boolean supports(Class<?> aClass) { 
            return true;
        }
    }

#### 6、自定义无权限处理器 `UrlAccessDeniedHandler`实现`AccessDeniedHandler`重写`handle()`方法 ####

在这里自定义403无权限响应内容，登录过后的权限处理  
【 **注**：要和未登录时的权限处理区分开哦~ 】

@Component
    public class UrlAccessDeniedHandler implements AccessDeniedHandler { 
        @Override
        public void handle(HttpServletRequest request, HttpServletResponse response, AccessDeniedException e) throws IOException, ServletException { 
            ResponseUtils.out(response, ApiResult.fail(403, e.getMessage()));
        }
    }

#### 7、最后在`Security 核心配置类`中配置以上处理 ####

@Configuration
    @EnableWebSecurity
    @EnableGlobalMethodSecurity(prePostEnabled = true)
    public class SecurityConfig extends WebSecurityConfigurerAdapter { 
    
        /** * 访问鉴权 - 认证token、签名... */
        private final MyAuthenticationFilter myAuthenticationFilter;
        /** * 访问权限认证异常处理 */
        private final AdminAuthenticationEntryPoint adminAuthenticationEntryPoint;
        /** * 用户密码校验过滤器 */
        private final AdminAuthenticationProcessingFilter adminAuthenticationProcessingFilter;
    
        // 上面是登录认证相关 下面为url权限相关 - ========================================================================================
    
        /** * 获取访问url所需要的角色信息 */
        private final UrlFilterInvocationSecurityMetadataSource urlFilterInvocationSecurityMetadataSource;
        /** * 认证权限处理 - 将上面所获得角色权限与当前登录用户的角色做对比，如果包含其中一个角色即可正常访问 */
        private final UrlAccessDecisionManager urlAccessDecisionManager;
        /** * 自定义访问无权限接口时403响应内容 */
        private final UrlAccessDeniedHandler urlAccessDeniedHandler;
    
        public SecurityConfig(MyAuthenticationFilter myAuthenticationFilter, AdminAuthenticationEntryPoint adminAuthenticationEntryPoint, AdminAuthenticationProcessingFilter adminAuthenticationProcessingFilter, UrlFilterInvocationSecurityMetadataSource urlFilterInvocationSecurityMetadataSource, UrlAccessDeniedHandler urlAccessDeniedHandler, UrlAccessDecisionManager urlAccessDecisionManager) { 
            this.myAuthenticationFilter = myAuthenticationFilter;
            this.adminAuthenticationEntryPoint = adminAuthenticationEntryPoint;
            this.adminAuthenticationProcessingFilter = adminAuthenticationProcessingFilter;
            this.urlFilterInvocationSecurityMetadataSource = urlFilterInvocationSecurityMetadataSource;
            this.urlAccessDeniedHandler = urlAccessDeniedHandler;
            this.urlAccessDecisionManager = urlAccessDecisionManager;
        }
    
    
        /** * 权限配置 * @param http * @throws Exception */
        @Override
        protected void configure(HttpSecurity http) throws Exception { 
            ExpressionUrlAuthorizationConfigurer<HttpSecurity>.ExpressionInterceptUrlRegistry registry = http.antMatcher("/**").authorizeRequests();
    
            // 禁用CSRF 开启跨域
            http.csrf().disable().cors();
    
            // 未登录认证异常
            http.exceptionHandling().authenticationEntryPoint(adminAuthenticationEntryPoint);
            // 登录过后访问无权限的接口时自定义403响应内容
            http.exceptionHandling().accessDeniedHandler(urlAccessDeniedHandler);
    
            // url权限认证处理
            registry.withObjectPostProcessor(new ObjectPostProcessor<FilterSecurityInterceptor>() { 
                @Override
                public <O extends FilterSecurityInterceptor> O postProcess(O o) { 
                    o.setSecurityMetadataSource(urlFilterInvocationSecurityMetadataSource);
                    o.setAccessDecisionManager(urlAccessDecisionManager);
                    return o;
                }
            });
    
            // 不创建会话 - 即通过前端传token到后台过滤器中验证是否存在访问权限
    //        http.sessionManagement().sessionCreationPolicy(SessionCreationPolicy.STATELESS);
    
            // 标识访问 `/home` 这个接口，需要具备`ADMIN`角色
    //        registry.antMatchers("/home").hasRole("ADMIN");
            // 标识只能在 服务器本地ip[127.0.0.1或localhost] 访问 `/home` 这个接口，其他ip地址无法访问
            registry.antMatchers("/home").hasIpAddress("127.0.0.1");
            // 允许匿名的url - 可理解为放行接口 - 多个接口使用,分割
            registry.antMatchers("/login", "/index").permitAll();
    //        registry.antMatchers("/**").access("hasAuthority('admin')");
            // OPTIONS(选项)：查找适用于一个特定网址资源的通讯选择。 在不需执行具体的涉及数据传输的动作情况下， 允许客户端来确定与资源相关的选项以及 / 或者要求， 或是一个服务器的性能
            registry.antMatchers(HttpMethod.OPTIONS, "/**").denyAll();
            // 自动登录 - cookie储存方式
            registry.and().rememberMe();
            // 其余所有请求都需要认证
            registry.anyRequest().authenticated();
            // 防止iframe 造成跨域
            registry.and().headers().frameOptions().disable();
    
            // 自定义过滤器在登录时认证用户名、密码
            http.addFilterAt(adminAuthenticationProcessingFilter, UsernamePasswordAuthenticationFilter.class)
                .addFilterBefore(myAuthenticationFilter, BasicAuthenticationFilter.class);
        }
    
        /** * 忽略拦截url或静态资源文件夹 - web.ignoring(): 会直接过滤该url - 将不会经过Spring Security过滤器链 * http.permitAll(): 不会绕开springsecurity验证，相当于是允许该路径通过 * @param web * @throws Exception */
        @Override
        public void configure(WebSecurity web) throws Exception { 
            web.ignoring().antMatchers(HttpMethod.GET,
                    "/favicon.ico",
                    "/*.html",
                    "/**/*.css",
                    "/**/*.js");
        }
    
    }

### 四、编写测试代码 ###

控制层：

@Slf4j
    @RestController
    public class IndexController { 
    
        @GetMapping("/")
        public ModelAndView showHome() { 
            return new ModelAndView("home.html");
        }
    
        @GetMapping("/index")
        public String index() { 
            return "Hello World ~";
        }
    
        @GetMapping("/login")
        public ModelAndView login() { 
            return new ModelAndView("login.html");
        }
    
        @GetMapping("/home")
        public String home() { 
            String name = SecurityContextHolder.getContext().getAuthentication().getName();
            log.info("登陆人：" + name);
            return "Hello~ " + name;
        }
    
        @GetMapping(value ="/admin")
        // 访问路径`/admin` 具有`ADMIN`角色权限 【这种是写死方式】
    // @PreAuthorize("hasPermission('/admin','ADMIN')")
        public String admin() { 
            return "Hello~ 管理员";
        }
    
        @GetMapping("/test")
        public String test() { 
            return "Hello~ 测试权限访问接口";
        }
        
    }

页面和其它相关代码这里就不贴出来了，具体可参考文末demo源码

### 五、运行访问测试效果 ###

###### 1、未登录时 ######

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly96aGVuZ3FpbmcuYmxvZy5jc2RuLm5ldA_size_16_color_FFFFFF_t_70 3]

###### 2、登录过后如果有权限则正常访问 ######

![在这里插入图片描述][20191019150955857.png]

###### 3、登录过后，没有权限 ######

这里我们可以修改数据库角色权限关联表`t_sys_role_permission`来进行测试哦 ~

`Security 动态url权限也就是依赖这张表来判断的，只要修改这张表分配角色对应url权限资源，用户访问url时就会动态的去判断，无需做其他处理，如果是将权限信息放在了缓存中，修改表数据时及时更新缓存即可！`  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly96aGVuZ3FpbmcuYmxvZy5jc2RuLm5ldA_size_16_color_FFFFFF_t_70 4]

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly96aGVuZ3FpbmcuYmxvZy5jc2RuLm5ldA_size_16_color_FFFFFF_t_70 5]

###### 4、登录过后，访问数据库中没有配置的url 并且 在Security中没有忽略拦截的url时 ######

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly96aGVuZ3FpbmcuYmxvZy5jc2RuLm5ldA_size_16_color_FFFFFF_t_70 6]

### 六、总结 ###

1.  自定义未登录权限处理器`AdminAuthenticationEntryPoint` \- 自定义未登录时访问无权限url响应内容
2.  自定义访问鉴权过滤器`MyAuthenticationFilter` \- 记录请求响应日志、是否合法访问，验证token过期等
3.  自定义`UrlFilterInvocationSecurityMetadataSource` \- 获取访问该url所需要的角色权限
4.  自定义`UrlAccessDecisionManager` \- 对访问url进行权限认证处理
5.  自定义`UrlAccessDeniedHandler` \- 登录过后访问无权限url失败处理器 - 自定义403无权限响应内容
6.  在`Security核心配置类`中配置以上处理器和过滤器

###### Security动态权限相关代码： ######

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly96aGVuZ3FpbmcuYmxvZy5jc2RuLm5ldA_size_16_color_FFFFFF_t_70 7]

#### 本文案例demo源码 ####

[https://gitee.com/zhengqingya/java-workspace][https_gitee.com_zhengqingya_java-workspace]

[https_blog.csdn.net_qq_38225558_article_details_101754743]: https://blog.csdn.net/qq_38225558/article/details/101754743
[https_blog.csdn.net_qq_38225558_article_details_102542072]: https://blog.csdn.net/qq_38225558/article/details/102542072
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[20191019150955857.png]: /images/20230531/3b8e97974ab24eec892812e9125b17e3.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly96aGVuZ3FpbmcuYmxvZy5jc2RuLm5ldA_size_16_color_FFFFFF_t_70 4]: /images/20230531/e22d3917a3e34919be9413e495043c1f.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly96aGVuZ3FpbmcuYmxvZy5jc2RuLm5ldA_size_16_color_FFFFFF_t_70 5]: /images/20230531/3d52c9d0d172462887ac806f24816a0f.png
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[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly96aGVuZ3FpbmcuYmxvZy5jc2RuLm5ldA_size_16_color_FFFFFF_t_70 7]: /images/20230531/02ad8b17697f4a96903137f8058bbc7b.png
[https_gitee.com_zhengqingya_java-workspace]: https://gitee.com/zhengqingya/java-workspace