AuthenticationProvider的实现类与UsernamePasswordAuthenticationToken的实现类一般放在springboot项目那个位置？可以放在同一个包下面吗？

AuthenticationProvider的实现类和UsernamePasswordAuthenticationToken的实现类都可以放在springboot项目的任何位置。一般情况下，它们被放置在security包内，因为它们都与Spring Security相关。但是，您也可以将它们放置在任何其他包内，只要您在配置Spring Security时指定正确的包路径即可。

至于它们是否可以放在同一个包下面，答案是可以的。通常情况下，如果这两个类的代码是紧密相关的，则将它们放在同一个包下是有意义的。但是，如果它们的代码没有紧密的关系，则最好将它们分开放置。

相关问题

SpringBoot整合JWT 用java-jwt依赖包实现

可以通过以下步骤在Spring Boot中集成JWT：

1. 添加java-jwt依赖包到pom.xml文件中：

<dependency>
    <groupId>com.auth0</groupId>
    <artifactId>java-jwt</artifactId>
    <version>3.18.1</version>
</dependency>

2. 创建一个JWT工具类来生成和验证JWT令牌：

import com.auth0.jwt.JWT;
import com.auth0.jwt.algorithms.Algorithm;
import com.auth0.jwt.exceptions.JWTVerificationException;
import com.auth0.jwt.interfaces.DecodedJWT;

import java.util.Date;

public class JwtUtils {

    private static final long EXPIRATION_TIME = 86400000; // 24 hours
    private static final String SECRET = "mySecret";
    private static final String ISSUER = "myIssuer";

    public static String generateToken(String username) {
        Date now = new Date();
        Date expiryDate = new Date(now.getTime() + EXPIRATION_TIME);

        return JWT.create()
                .withSubject(username)
                .withIssuer(ISSUER)
                .withIssuedAt(now)
                .withExpiresAt(expiryDate)
                .sign(Algorithm.HMAC512(SECRET));
    }

    public static String getUsernameFromToken(String token) throws JWTVerificationException {
        DecodedJWT jwt = JWT.require(Algorithm.HMAC512(SECRET))
                .withIssuer(ISSUER)
                .build()
                .verify(token);

        return jwt.getSubject();
    }
}

3. 在Spring Security配置中添加JWT过滤器，以验证JWT令牌：

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Configuration;
import org.springframework.core.annotation.Order;
import org.springframework.http.HttpStatus;
import org.springframework.security.authentication.AuthenticationManager;
import org.springframework.security.authentication.UsernamePasswordAuthenticationToken;
import org.springframework.security.config.annotation.SecurityConfigurerAdapter;
import org.springframework.security.config.annotation.web.builders.HttpSecurity;
import org.springframework.security.config.annotation.web.configuration.WebSecurityConfigurerAdapter;
import org.springframework.security.core.Authentication;
import org.springframework.security.core.AuthenticationException;
import org.springframework.security.web.authentication.HttpStatusEntryPoint;
import org.springframework.security.web.authentication.UsernamePasswordAuthenticationFilter;

import javax.servlet.FilterChain;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

@Configuration
@Order(1)
public class JwtConfig extends SecurityConfigurerAdapter<javax.servlet.Filter, HttpSecurity> {

    @Autowired
    private JwtAuthenticationProvider jwtAuthenticationProvider;

    @Override
    public void configure(HttpSecurity http) throws Exception {
        JwtAuthenticationFilter jwtAuthenticationFilter = new JwtAuthenticationFilter();
        jwtAuthenticationFilter.setAuthenticationManager(http.getSharedObject(AuthenticationManager.class));
        jwtAuthenticationFilter.setAuthenticationFailureHandler(new JwtAuthenticationFailureHandler());
        http.addFilterBefore(jwtAuthenticationFilter, UsernamePasswordAuthenticationFilter.class);
    }

    private class JwtAuthenticationFilter extends UsernamePasswordAuthenticationFilter {

        @Override
        public Authentication attemptAuthentication(HttpServletRequest request, HttpServletResponse response) throws AuthenticationException {
            String token = request.getHeader("Authorization");

            if (token == null || !token.startsWith("Bearer ")) {
                throw new JwtAuthenticationException("Invalid JWT token");
            }

            String username = JwtUtils.getUsernameFromToken(token.substring(7));

            if (username == null) {
                throw new JwtAuthenticationException("Invalid JWT token");
            }

            return jwtAuthenticationProvider.authenticate(new UsernamePasswordAuthenticationToken(username, ""));
        }

        @Override
        protected void successfulAuthentication(HttpServletRequest request, HttpServletResponse response, FilterChain chain, Authentication authResult) throws IOException, ServletException {
            super.successfulAuthentication(request, response, chain, authResult);
            chain.doFilter(request, response);
        }
    }

    private class JwtAuthenticationFailureHandler extends HttpStatusEntryPoint {

        @Override
        public void commence(HttpServletRequest request, HttpServletResponse response, AuthenticationException authException) throws IOException, ServletException {
            response.setStatus(HttpStatus.UNAUTHORIZED.value());
        }
    }
}

4. 创建一个JwtAuthenticationProvider来验证用户名和密码：

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.security.authentication.AuthenticationProvider;
import org.springframework.security.authentication.UsernamePasswordAuthenticationToken;
import org.springframework.security.core.Authentication;
import org.springframework.security.core.AuthenticationException;
import org.springframework.security.core.userdetails.UserDetails;
import org.springframework.security.core.userdetails.UserDetailsService;
import org.springframework.security.crypto.password.PasswordEncoder;
import org.springframework.stereotype.Component;

@Component
public class JwtAuthenticationProvider implements AuthenticationProvider {

    @Autowired
    private UserDetailsService userDetailsService;

    @Autowired
    private PasswordEncoder passwordEncoder;

    @Override
    public Authentication authenticate(Authentication authentication) throws AuthenticationException {
        String username = authentication.getName();
        String password = (String) authentication.getCredentials();

        UserDetails userDetails = userDetailsService.loadUserByUsername(username);

        if (!passwordEncoder.matches(password, userDetails.getPassword())) {
            throw new JwtAuthenticationException("Invalid username or password");
        }

        return new UsernamePasswordAuthenticationToken(username, password, userDetails.getAuthorities());
    }

    @Override
    public boolean supports(Class<?> authentication) {
        return authentication.equals(UsernamePasswordAuthenticationToken.class);
    }
}

5. 在Spring Security配置中添加JwtConfig：

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Configuration;
import org.springframework.core.annotation.Order;
import org.springframework.security.config.annotation.authentication.builders.AuthenticationManagerBuilder;
import org.springframework.security.config.annotation.web.builders.HttpSecurity;
import org.springframework.security.config.annotation.web.configuration.WebSecurityConfigurerAdapter;

@Configuration
public class SecurityConfig extends WebSecurityConfigurerAdapter {

    @Autowired
    private JwtAuthenticationProvider jwtAuthenticationProvider;

    @Override
    protected void configure(AuthenticationManagerBuilder auth) throws Exception {
        auth.authenticationProvider(jwtAuthenticationProvider);
    }

    @Override
    protected void configure(HttpSecurity http) throws Exception {
        http.csrf().disable()
                .antMatcher("/**")
                .authorizeRequests()
                .antMatchers("/login").permitAll()
                .anyRequest().authenticated()
                .and()
                .apply(new JwtConfig());
    }
}

现在你就可以在Spring Boot应用程序中使用JWT进行身份验证了。

给出一个springboot项目集成jwt的例子

好的，我可以回答这个问题。以下是一个Spring Boot项目集成JWT的示例：

1. 首先，需要在pom.xml文件中添加以下依赖：

<dependency>
    <groupId>io.jsonwebtoken</groupId>
    <artifactId>jjwt</artifactId>
    <version>.9.1</version>
</dependency>

2. 创建一个JwtUtil类，用于生成和验证JWT：

import io.jsonwebtoken.Claims;
import io.jsonwebtoken.Jwts;
import io.jsonwebtoken.SignatureAlgorithm;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Component;

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

@Component
public class JwtUtil {

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

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

    public String generateToken(String username) {
        Map<String, Object> claims = new HashMap<>();
        claims.put("sub", username);
        claims.put("created", new Date());
        return Jwts.builder()
                .setClaims(claims)
                .setExpiration(new Date(System.currentTimeMillis() + expiration * 100))
                .signWith(SignatureAlgorithm.HS512, secret)
                .compact();
    }

    public boolean validateToken(String token, String username) {
        Claims claims = getClaims(token);
        if (claims != null) {
            String subject = claims.getSubject();
            Date expirationDate = claims.getExpiration();
            Date now = new Date(System.currentTimeMillis());
            if (subject.equals(username) && expirationDate.after(now)) {
                return true;
            }
        }
        return false;
    }

    public Claims getClaims(String token) {
        try {
            return Jwts.parser().setSigningKey(secret).parseClaimsJws(token).getBody();
        } catch (Exception e) {
            return null;
        }
    }
}

3. 创建一个JwtAuthenticationFilter类，用于拦截请求并验证JWT：

import org.springframework.security.authentication.AuthenticationManager;
import org.springframework.security.authentication.UsernamePasswordAuthenticationToken;
import org.springframework.security.core.Authentication;
import org.springframework.security.core.context.SecurityContextHolder;
import org.springframework.security.web.authentication.AbstractAuthenticationProcessingFilter;
import org.springframework.security.web.util.matcher.AntPathRequestMatcher;

import javax.servlet.FilterChain;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

public class JwtAuthenticationFilter extends AbstractAuthenticationProcessingFilter {

    public JwtAuthenticationFilter(AuthenticationManager authenticationManager) {
        super(new AntPathRequestMatcher("/api/**"));
        setAuthenticationManager(authenticationManager);
    }

    @Override
    public Authentication attemptAuthentication(HttpServletRequest request, HttpServletResponse response) {
        String token = request.getHeader("Authorization");
        if (token != null) {
            String username = JwtUtil.getClaims(token).getSubject();
            if (username != null) {
                return getAuthenticationManager().authenticate(new UsernamePasswordAuthenticationToken(username, null));
            }
        }
        return null;
    }

    @Override
    protected void successfulAuthentication(HttpServletRequest request, HttpServletResponse response, FilterChain chain, Authentication authResult) throws IOException, ServletException {
        SecurityContextHolder.getContext().setAuthentication(authResult);
        chain.doFilter(request, response);
    }
}

4. 在WebSecurityConfig类中配置JwtAuthenticationFilter：

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.security.authentication.AuthenticationManager;
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.crypto.bcrypt.BCryptPasswordEncoder;
import org.springframework.security.crypto.password.PasswordEncoder;
import org.springframework.security.web.authentication.UsernamePasswordAuthenticationFilter;

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

    @Autowired
    private JwtAuthenticationEntryPoint jwtAuthenticationEntryPoint;

    @Autowired
    private JwtUserDetailsService jwtUserDetailsService;

    @Autowired
    private JwtRequestFilter jwtRequestFilter;

    @Override
    protected void configure(HttpSecurity http) throws Exception {
        http.csrf().disable()
                .authorizeRequests().antMatchers("/api/authenticate").permitAll()
                .anyRequest().authenticated()
                .and().exceptionHandling().authenticationEntryPoint(jwtAuthenticationEntryPoint)
                .and().sessionManagement().sessionCreationPolicy(SessionCreationPolicy.STATELESS);
        http.addFilterBefore(jwtRequestFilter, UsernamePasswordAuthenticationFilter.class);
    }

    @Autowired
    public void configureGlobal(AuthenticationManagerBuilder auth) throws Exception {
        auth.userDetailsService(jwtUserDetailsService).passwordEncoder(passwordEncoder());
    }

    @Bean
    public PasswordEncoder passwordEncoder() {
        return new BCryptPasswordEncoder();
    }

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

    @Bean
    public JwtAuthenticationFilter jwtAuthenticationFilter() throws Exception {
        return new JwtAuthenticationFilter(authenticationManagerBean());
    }
}

以上就是一个Spring Boot项目集成JWT的示例，希望能对你有所帮助。