@getter和@setter需要引入哪个依赖

如果你提到的是Java中的注解 @Getter 和 @Setter，它们通常是由Lombok库提供的。Lombok是一个Java库，可以通过注解来自动生成常见的代码，如getter、setter、构造函数等。要使用 @Getter 和 @Setter 注解，你需要在项目中引入Lombok的依赖。下面是一个使用Maven构建工具的示例：

<dependency>
    <groupId>org.projectlombok</groupId>
    <artifactId>lombok</artifactId>
    <version>1.18.20</version>
    <scope>provided</scope>
</dependency>

当你在类上使用 @Getter 和 @Setter 注解时，Lombok会自动生成对应的getter和setter方法。这样可以简化代码编写，并且提高开发效率。需要注意的是，你在编译代码时需要确保IDE或构建工具已经配置了正确的Lombok插件，以便能够正确处理这些注解。

相关问题

vue3getter和setter

在Vue3中，getter和setter是通过使用属性代理的方式实现的。具体来说，Vue3使用了`Object.defineProperty`方法来对属性进行代理，从而通过`vm.xx`对`vm._data.xx`进行读写操作。在Vue的实例化过程中，会调用`observe`方法来实例化一个`Observe`类，将`vm.xx`由数据属性转变为访问器属性，并设置getter和setter。每个属性的getter都会实例化一个`Dep`类，用于收集依赖，而setter则会通知更新。当数据发生变动时，setter会触发对应属性维护的`dep`的`notify`方法，通知保存在`dep.subs`中的`Watcher`实例进行更新。这样就实现了getter和setter的功能。

然而，`Object.defineProperty`存在一些问题。首先，在`defineReactive`方法中使用getter和setter时，需要遍历递归，并使用闭包存储数据值的副本。当数据量较大时，会导致性能下降。其次，`Object.defineProperty`的代理是针对属性级别的，无法对对象级别进行代理。

为了解决这些问题，Vue3引入了新的代理方式，即`Proxy`。使用`Proxy`可以更灵活地进行属性代理。通过创建一个`Proxy`实例，可以对整个对象进行代理操作。与`Object.defineProperty`相比，`Proxy`可以动态添加和删除属性，并且可以对这些操作做出反应。在控制台修改`Proxy`的值后，页面会自动更新。相比之下，使用`Object.defineProperty`需要在`data`中定义属性并为每个属性调用`Object.defineProperty`方法设置getter和setter，而且无法对delete操作做出反应。

综上所述，Vue3中通过属性代理实现了getter和setter的功能。`Object.defineProperty`是Vue3早期使用的方式，但由于其存在的问题，Vue3后续引入了`Proxy`，使得代码更具有抽象性。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
#### 引用[.reference_title]
- *1* *2* *3* [关于Vue3.x选用proxy放弃访问器属性（setter/getter）的一点理解。](https://blog.csdn.net/weixin_33724059/article/details/91422102)[target="_blank" data-report-click={"spm":"1018.2226.3001.9630","extra":{"utm_source":"vip_chatgpt_common_search_pc_result","utm_medium":"distribute.pc_search_result.none-task-cask-2~all~insert_cask~default-1-null.142^v93^chatsearchT3_1"}}] [.reference_item style="max-width: 100%"]
[ .reference_list ]

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。