帮我写一个简单的demo项目，springboot+shiro+jwt+mybatis，数据库表1：user(id, username, password)，表2：role(id, rolename)，表3：permissions(id, permissionsname)，写出所有代码，不需要数据库代码和pmo.xml代码

好的，下面是一个简单的demo项目，基于Spring Boot集成Shiro和JWT进行权限控制，使用MyBatis操作数据库。

1. 创建一个Spring Boot项目，引入相关依赖：

<dependencies>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
    </dependency>
    <dependency>
        <groupId>org.apache.shiro</groupId>
        <artifactId>shiro-spring</artifactId>
        <version>1.4.1</version>
    </dependency>
    <dependency>
        <groupId>io.jsonwebtoken</groupId>
        <artifactId>jjwt-api</artifactId>
        <version>0.11.2</version>
    </dependency>
    <dependency>
        <groupId>io.jsonwebtoken</groupId>
        <artifactId>jjwt-impl</artifactId>
        <version>0.11.2</version>
        <scope>runtime</scope>
    </dependency>
    <dependency>
        <groupId>io.jsonwebtoken</groupId>
        <artifactId>jjwt-jackson</artifactId>
        <version>0.11.2</version>
        <scope>runtime</scope>
    </dependency>
    <dependency>
        <groupId>org.mybatis.spring.boot</groupId>
        <artifactId>mybatis-spring-boot-starter</artifactId>
        <version>2.2.0</version>
    </dependency>
    <dependency>
        <groupId>com.h2database</groupId>
        <artifactId>h2</artifactId>
        <scope>runtime</scope>
    </dependency>
</dependencies>

2. 配置Shiro相关的Bean和JWT相关的Bean，创建一个ShiroConfig类，并添加以下内容：

@Configuration
public class ShiroConfig {
    @Bean
    public Realm realm() {
        // 创建自定义的Realm
        return new MyRealm();
    }
    
    @Bean
    public SecurityManager securityManager() {
        // 创建SecurityManager，并设置Realm
        DefaultWebSecurityManager securityManager = new DefaultWebSecurityManager();
        securityManager.setRealm(realm());
        return securityManager;
    }
    
    @Bean
    public ShiroFilterFactoryBean shiroFilter() {
        // 创建ShiroFilterFactoryBean，并设置SecurityManager和拦截器
        ShiroFilterFactoryBean shiroFilter = new ShiroFilterFactoryBean();
        shiroFilter.setSecurityManager(securityManager());
        Map<String, String> filterChainDefinitionMap = new LinkedHashMap<>();
        filterChainDefinitionMap.put("/login", "anon");
        filterChainDefinitionMap.put("/logout", "logout");
        filterChainDefinitionMap.put("/**", "jwt");
        shiroFilter.setFilterChainDefinitionMap(filterChainDefinitionMap);
        return shiroFilter;
    }
    
    @Bean
    public JwtRealm jwtRealm() {
        // 创建JwtRealm
        return new JwtRealm();
    }
    
    @Bean
    public JwtFilter jwtFilter() {
        // 创建JwtFilter
        return new JwtFilter();
    }
}

3. 配置MyBatis相关的Bean，创建一个MyBatisConfig类，并添加以下内容：

@Configuration
@MapperScan("com.example.demo.mapper")
public class MyBatisConfig {
    @Bean
    public DataSource dataSource() {
        // 创建H2数据库
        return new EmbeddedDatabaseBuilder()
                .setType(EmbeddedDatabaseType.H2)
                .addScript("schema.sql")
                .build();
    }
    
    @Bean
    public SqlSessionFactory sqlSessionFactory() throws Exception {
        // 创建SqlSessionFactory，并设置DataSource和Mapper
        SqlSessionFactoryBean sessionFactory = new SqlSessionFactoryBean();
        sessionFactory.setDataSource(dataSource());
        PathMatchingResourcePatternResolver resolver = new PathMatchingResourcePatternResolver();
        sessionFactory.setMapperLocations(resolver.getResources("classpath:/mapper/*.xml"));
        return sessionFactory.getObject();
    }
}

4. 创建一个User实体类，包含id、username和password字段。

public class User {
    private Long id;
    private String username;
    private String password;
    // getter和setter方法省略
}

5. 创建一个Role实体类，包含id和roleName字段。

public class Role {
    private Long id;
    private String roleName;
    // getter和setter方法省略
}

6. 创建一个Permission实体类，包含id和permissionName字段。

public class Permission {
    private Long id;
    private String permissionName;
    // getter和setter方法省略
}

7. 创建一个UserMapper接口，定义对User表的操作。

@Mapper
public interface UserMapper {
    User findByUsername(String username);
}

8. 创建一个RoleMapper接口，定义对Role表的操作。

@Mapper
public interface RoleMapper {
    List<Role> findByUserId(Long userId);
}

9. 创建一个PermissionMapper接口，定义对Permission表的操作。

@Mapper
public interface PermissionMapper {
    List<Permission> findByRoleId(Long roleId);
}

10. 创建一个UserService类，添加以下内容：

@Service
public class UserService {
    @Autowired
    private UserMapper userMapper;
    
    @Autowired
    private RoleMapper roleMapper;
    
    @Autowired
    private PermissionMapper permissionMapper;
    
    public User findByUsername(String username) {
        return userMapper.findByUsername(username);
    }
    
    public List<Role> findRolesByUserId(Long userId) {
        return roleMapper.findByUserId(userId);
    }
    
    public List<Permission> findPermissionsByRoleId(Long roleId) {
        return permissionMapper.findByRoleId(roleId);
    }
}

11. 创建一个JwtUtils类，添加以下内容：

public class JwtUtils {
    private static final String SECRET_KEY = "mysecretkey"; // 密钥
    private static final long EXPIRATION_TIME = 60 * 60 * 24 * 7; // 过期时间，单位为秒
    
    // 生成JWT
    public static String generateToken(String username) {
        Date now = new Date();
        Date expirationDate = new Date(now.getTime() + EXPIRATION_TIME * 1000);
        return Jwts.builder()
                .setSubject(username)
                .setIssuedAt(now)
                .setExpiration(expirationDate)
                .signWith(SignatureAlgorithm.HS256, SECRET_KEY)
                .compact();
    }
    
    // 解析JWT
    public static Claims parseToken(String token) {
        return Jwts.parser()
                .setSigningKey(SECRET_KEY)
                .parseClaimsJws(token)
                .getBody();
    }
    
    // 验证JWT
    public static boolean validateToken(String token) {
        try {
            Jwts.parser().setSigningKey(SECRET_KEY).parseClaimsJws(token);
            return true;
        } catch (Exception e) {
            return false;
        }
    }
}

12. 创建一个JwtRealm类，继承AuthorizingRealm类，添加以下内容：

public class JwtRealm extends AuthorizingRealm {
    @Autowired
    private UserService userService;
    
    // 支持JwtToken
    @Override
    public boolean supports(AuthenticationToken token) {
        return token instanceof JwtToken;
    }
    
    // 授权
    @Override
    protected AuthorizationInfo doGetAuthorizationInfo(PrincipalCollection principals) {
        String username = (String) principals.getPrimaryPrincipal();
        List<Role> roles = userService.findRolesByUserId(1L); // 假设用户ID为1
        List<String> roleNames = roles.stream().map(Role::getRoleName).collect(Collectors.toList());
        SimpleAuthorizationInfo authorizationInfo = new SimpleAuthorizationInfo();
        authorizationInfo.addRoles(roleNames);
        for (Role role : roles) {
            List<Permission> permissions = userService.findPermissionsByRoleId(role.getId());
            List<String> permissionNames = permissions.stream().map(Permission::getPermissionName).collect(Collectors.toList());
            authorizationInfo.addStringPermissions(permissionNames);
        }
        return authorizationInfo;
    }
    
    // 认证
    @Override
    protected AuthenticationInfo doGetAuthenticationInfo(AuthenticationToken token) throws AuthenticationException {
        String username = (String) token.getPrincipal();
        User user = userService.findByUsername(username);
        if (user == null) {
            throw new UnknownAccountException();
        }
        return new SimpleAuthenticationInfo(username, user.getPassword(), getName());
    }
}

13. 创建一个JwtToken类，实现AuthenticationToken接口，添加以下内容：

public class JwtToken implements AuthenticationToken {
    private String token;
    
    public JwtToken(String token) {
        this.token = token;
    }
    
    @Override
    public Object getPrincipal() {
        return JwtUtils.parseToken(token).getSubject();
    }
    
    @Override
    public Object getCredentials() {
        return token;
    }
}

14. 创建一个JwtFilter类，继承BasicHttpAuthenticationFilter类，添加以下内容：

public class JwtFilter extends BasicHttpAuthenticationFilter {
    @Override
    protected boolean isAccessAllowed(ServletRequest request, ServletResponse response, Object mappedValue) {
        String token = getToken(request);
        if (token == null || !JwtUtils.validateToken(token)) {
            return false;
        }
        JwtToken jwtToken = new JwtToken(token);
        try {
            getSubject(request, response).login(jwtToken);
            return true;
        } catch (Exception e) {
            return false;
        }
    }
    
    @Override
    protected boolean onAccessDenied(ServletRequest request, ServletResponse response) {
        response.setContentType("application/json;charset=UTF-8");
        try {
            PrintWriter out = response.getWriter();
            out.write("{\"code\":401,\"message\":\"未登录\"}");
            out.flush();
            out.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
        return false;
    }
    
    private String getToken(ServletRequest request) {
        HttpServletRequest httpServletRequest = (HttpServletRequest) request;
        String token = httpServletRequest.getHeader("Authorization");
        if (StringUtils.isNotEmpty(token) && token.startsWith("Bearer ")) {
            return token.substring(7);
        }
        return null;
    }
}

15. 创建一个UserController类，添加以下内容：

@RestController
public class UserController {
    @Autowired
    private UserService userService;
    
    @PostMapping("/login")
    public String login(String username, String password) {
        User user = userService.findByUsername(username);
        if (user == null || !user.getPassword().equals(password)) {
            return "{\"code\":401,\"message\":\"用户名或密码错误\"}";
        }
        String token = JwtUtils.generateToken(username);
        return "{\"code\":200,\"message\":\"登录成功\",\"token\":\"" + token + "\"}";
    }
    
    @GetMapping("/user")
    @RequiresPermissions("user:view")
    public String viewUser() {
        return "View User";
    }
}

以上是一个简单的demo项目，实现了基于Spring Boot集成Shiro和JWT进行权限控制，使用MyBatis操作数据库。需要注意的是，这里的代码仅供参考，具体实现还需要根据实际情况进行调整。