@Override protected Serializable pkVal() { return this.id; }

这段代码是一个方法的重写（Override）示例。它覆盖了父类中的一个受保护的方法 pkVal()，并指定了返回类型为 Serializable。在该方法中，使用了关键字 "this" 来引用当前对象的属性 id，并将其作为返回值。

根据代码片段，可以猜测该方法可能是用于获取对象的主键值，以便在持久化或其他相关操作中使用。通过返回对象的 id 属性，可以确保该对象在不同操作之间具有唯一标识。

需要注意的是，代码片段只提供了方法的重写定义，并没有完整的类结构和上下文。因此，在实际应用中，可能还需要考虑其他因素来正确实现该方法。

相关问题

springboot security项目 如何封装jwt 及token 其中数据表为package com.aokace.entity; import com.baomidou.mybatisplus.annotation.IdType; import com.baomidou.mybatisplus.annotation.TableField; import com.baomidou.mybatisplus.annotation.TableId; import com.baomidou.mybatisplus.annotation.TableName; import java.io.Serializable; import io.swagger.annotations.ApiModel; import io.swagger.annotations.ApiModelProperty; import lombok.Getter; import lombok.Setter; /** * <p> * * </p> * * @author aokace * @since 2023-05-23 */ @Getter @Setter @TableName("user") @ApiModel(value = "User对象", description = "") public class User implements Serializable { private static final long serialVersionUID = 1L; @TableId(value = "userid", type = IdType.AUTO) private Integer userid; @TableField("authority") private String authority; @TableField("role") private String role; @TableField("username") private String username; @TableField("password") private String password; }

首先需要引入相关的依赖，包括JWT和Spring Security的依赖：

<dependency>
    <groupId>io.jsonwebtoken</groupId>
    <artifactId>jjwt</artifactId>
    <version>0.9.1</version>
</dependency>

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-security</artifactId>
</dependency>

然后创建一个JwtTokenUtil类来实现JWT的签发和验证功能：

import io.jsonwebtoken.Claims;
import io.jsonwebtoken.JwtBuilder;
import io.jsonwebtoken.Jwts;
import io.jsonwebtoken.SignatureAlgorithm;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.security.core.userdetails.UserDetails;
import org.springframework.stereotype.Component;

import java.util.Date;
import java.util.HashMap;
import java.util.Map;

@Component
public class JwtTokenUtil {

    private static final String CLAIM_KEY_USERNAME = "sub";
    private static final String CLAIM_KEY_CREATED = "created";

    @Value("${jwt.secret}")
    private String secret;

    @Value("${jwt.expiration}")
    private Long expiration;

    public String generateToken(UserDetails userDetails) {
        Map<String, Object> claims = new HashMap<>();
        claims.put(CLAIM_KEY_USERNAME, userDetails.getUsername());
        claims.put(CLAIM_KEY_CREATED, new Date());
        return generateToken(claims);
    }

    public String getUsernameFromToken(String token) {
        String username;
        try {
            Claims claims = getClaimsFromToken(token);
            username = claims.getSubject();
        } catch (Exception e) {
            username = null;
        }
        return username;
    }

    public Date getCreatedDateFromToken(String token) {
        Date created;
        try {
            Claims claims = getClaimsFromToken(token);
            created = new Date((Long) claims.get(CLAIM_KEY_CREATED));
        } catch (Exception e) {
            created = null;
        }
        return created;
    }

    public Date getExpirationDateFromToken(String token) {
        Date expiration;
        try {
            Claims claims = getClaimsFromToken(token);
            expiration = claims.getExpiration();
        } catch (Exception e) {
            expiration = null;
        }
        return expiration;
    }

    public boolean isTokenExpired(String token) {
        Date expiration = getExpirationDateFromToken(token);
        return expiration.before(new Date());
    }

    public String refreshToken(String token) {
        String refreshedToken;
        try {
            Claims claims = getClaimsFromToken(token);
            claims.put(CLAIM_KEY_CREATED, new Date());
            refreshedToken = generateToken(claims);
        } catch (Exception e) {
            refreshedToken = null;
        }
        return refreshedToken;
    }

    public boolean validateToken(String token, UserDetails userDetails) {
        String username = getUsernameFromToken(token);
        return username.equals(userDetails.getUsername()) && !isTokenExpired(token);
    }

    private Claims getClaimsFromToken(String token) {
        Claims claims;
        try {
            claims = Jwts.parser()
                    .setSigningKey(secret)
                    .parseClaimsJws(token)
                    .getBody();
        } catch (Exception e) {
            claims = null;
        }
        return claims;
    }

    private String generateToken(Map<String, Object> claims) {
        Date expirationDate = new Date(System.currentTimeMillis() + expiration * 1000);
        JwtBuilder builder = Jwts.builder()
                .setClaims(claims)
                .setExpiration(expirationDate)
                .signWith(SignatureAlgorithm.HS512, secret);
        return builder.compact();
    }
}

其中，JwtTokenUtil类中的generateToken方法用于生成JWT Token，getUsernameFromToken和getExpirationDateFromToken方法用于解析JWT Token中的用户名和过期时间，isTokenExpired方法用于判断JWT Token是否已经过期，refreshToken方法用于刷新JWT Token，validateToken方法用于验证JWT Token是否有效，getClaimsFromToken方法用于从JWT Token中获取Claims。

然后在Spring Security的配置类中添加JwtTokenFilter来实现JWT的过滤和验证：

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Configuration;
import org.springframework.security.authentication.AuthenticationManager;
import org.springframework.security.authentication.UsernamePasswordAuthenticationToken;
import org.springframework.security.config.annotation.authentication.builders.AuthenticationManagerBuilder;
import org.springframework.security.config.annotation.method.configuration.EnableGlobalMethodSecurity;
import org.springframework.security.config.annotation.web.builders.HttpSecurity;
import org.springframework.security.config.annotation.web.configuration.EnableWebSecurity;
import org.springframework.security.config.annotation.web.configuration.WebSecurityConfigurerAdapter;
import org.springframework.security.config.http.SessionCreationPolicy;
import org.springframework.security.core.Authentication;
import org.springframework.security.core.AuthenticationException;
import org.springframework.security.core.userdetails.UserDetailsService;
import org.springframework.security.crypto.bcrypt.BCryptPasswordEncoder;
import org.springframework.security.web.authentication.UsernamePasswordAuthenticationFilter;

@Configuration
@EnableWebSecurity
@EnableGlobalMethodSecurity(prePostEnabled = true)
public class SecurityConfig extends WebSecurityConfigurerAdapter {

    @Autowired
    private UserDetailsService userDetailsService;

    @Autowired
    private JwtTokenFilter jwtTokenFilter;

    @Autowired
    private JwtAuthenticationEntryPoint jwtAuthenticationEntryPoint;

    @Override
    protected void configure(AuthenticationManagerBuilder auth) throws Exception {
        auth.userDetailsService(userDetailsService).passwordEncoder(new BCryptPasswordEncoder());
    }

    @Override
    protected void configure(HttpSecurity http) throws Exception {
        http.csrf().disable()
                .authorizeRequests()
                .antMatchers("/login").permitAll()
                .anyRequest().authenticated()
                .and()
                .exceptionHandling().authenticationEntryPoint(jwtAuthenticationEntryPoint)
                .and()
                .sessionManagement().sessionCreationPolicy(SessionCreationPolicy.STATELESS);

        http.addFilterBefore(jwtTokenFilter, UsernamePasswordAuthenticationFilter.class);
    }

    @Override
    public AuthenticationManager authenticationManagerBean() throws Exception {
        return super.authenticationManagerBean();
    }
}

其中，SecurityConfig类中的configure方法用于配置Spring Security的策略，addFilterBefore方法用于添加JwtTokenFilter，authenticationManagerBean方法用于获取AuthenticationManager。

最后，在登录接口中，使用JwtTokenUtil生成JWT Token并返回给前端：

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.ResponseEntity;
import org.springframework.security.authentication.AuthenticationManager;
import org.springframework.security.authentication.UsernamePasswordAuthenticationToken;
import org.springframework.security.core.Authentication;
import org.springframework.security.core.userdetails.UserDetails;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class AuthController {

    @Autowired
    private AuthenticationManager authenticationManager;

    @Autowired
    private JwtTokenUtil jwtTokenUtil;

    @Autowired
    private UserDetailsService userDetailsService;

    @PostMapping("/login")
    public ResponseEntity<?> login(@RequestBody AuthRequest authRequest) throws Exception {
        try {
            Authentication authentication = authenticationManager.authenticate(
                    new UsernamePasswordAuthenticationToken(authRequest.getUsername(), authRequest.getPassword())
            );
            UserDetails userDetails = userDetailsService.loadUserByUsername(authRequest.getUsername());
            String token = jwtTokenUtil.generateToken(userDetails);
            return ResponseEntity.ok(new AuthResponse(token));
        } catch (Exception e) {
            throw new Exception("Incorrect username or password", e);
        }
    }
}

其中，AuthController类中的login方法用于处理登录请求，通过authenticationManager.authenticate方法验证用户名和密码，然后使用JwtTokenUtil生成JWT Token并返回给前端。

shiro整合redis

要将 Shiro 整合 Redis，可以使用 Redis 缓存来存储 Shiro 的会话信息和授权信息。下面是实现的基本步骤：

1. 首先，确保已经正确安装和配置了 Redis 服务器。

2. 添加 Redis 的依赖到项目的构建文件中，例如 Maven 的 pom.xml 文件：

<dependency>
    <groupId>redis.clients</groupId>
    <artifactId>jedis</artifactId>
    <version>版本号</version>
</dependency>

3. 创建一个 RedisShiroSessionDAO 类，实现 Shiro 的 SessionDAO 接口，用于将 Shiro 的会话信息存储到 Redis 中。

import org.apache.shiro.session.Session;
import org.apache.shiro.session.mgt.eis.EnterpriseCacheSessionDAO;
import redis.clients.jedis.Jedis;
import redis.clients.jedis.JedisPool;

public class RedisShiroSessionDAO extends EnterpriseCacheSessionDAO {
    private JedisPool jedisPool;

    public void setJedisPool(JedisPool jedisPool) {
        this.jedisPool = jedisPool;
    }

    @Override
    protected Serializable doCreate(Session session) {
        Serializable sessionId = generateSessionId(session);
        assignSessionId(session, sessionId);
        
        try (Jedis jedis = jedisPool.getResource()) {
            jedis.setex(sessionId.toString().getBytes(), session.getTimeout() / 1000,
                    SerializeUtils.serialize(session));
        }
        
        return sessionId;
    }

    @Override
    protected Session doReadSession(Serializable sessionId) {
        try (Jedis jedis = jedisPool.getResource()) {
            byte[] sessionBytes = jedis.get(sessionId.toString().getBytes());
            
            if (sessionBytes != null) {
                return SerializeUtils.deserialize(sessionBytes);
            }
        }
        
        return null;
    }

    @Override
    protected void doUpdate(Session session) {
        try (Jedis jedis = jedisPool.getResource()) {
            jedis.setex(session.getId().toString().getBytes(), session.getTimeout() / 1000,
                    SerializeUtils.serialize(session));
        }
    }

    @Override
    protected void doDelete(Session session) {
        try (Jedis jedis = jedisPool.getResource()) {
            jedis.del(session.getId().toString().getBytes());
        }
    }
}

4. 配置 Shiro 的会话管理器和会话DAO，将 RedisShiroSessionDAO 设置为会话 DAO。

<bean id="sessionManager" class="org.apache.shiro.web.session.mgt.DefaultWebSessionManager">
    <property name="sessionDAO" ref="redisShiroSessionDAO"/>
</bean>

<bean id="redisShiroSessionDAO" class="com.example.RedisShiroSessionDAO">