<dependencies>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-security</artifactId>
    </dependency>
    <dependency>
        <groupId>io.jsonwebtoken</groupId>
        <artifactId>jjwt</artifactId>
        <version>0.9.1</version>
    </dependency>
</dependencies>

import io.jsonwebtoken.Claims;
import io.jsonwebtoken.Jwts;
import io.jsonwebtoken.SignatureAlgorithm;
import org.springframework.stereotype.Component;

import java.util.Date;

@Component
public class JwtTokenUtil {
    private String secretKey = "secret"; // 密鑰，實(shí)際應(yīng)用中應(yīng)保密

    public String generateAccessToken(String username) {
        return Jwts.builder()
                .setSubject(username)
                .setIssuer("YourApp")
                .setIssuedAt(new Date())
                .setExpiration(new Date(System.currentTimeMillis() + 15 * 60 * 1000)) // 15分鐘后過期
                .signWith(SignatureAlgorithm.HS512, secretKey)
                .compact();
    }

    public String generateRefreshToken(String username) {
        return Jwts.builder()
                .setSubject(username)
                .setIssuer("YourApp")
                .setIssuedAt(new Date())
                .setExpiration(new Date(System.currentTimeMillis() + 7 * 24 * 60 * 60 * 1000)) // 7天后過期
                .signWith(SignatureAlgorithm.HS512, secretKey)
                .compact();
    }

    public Claims getClaimsFromToken(String token) {
        return Jwts.parser()
                .setSigningKey(secretKey)
                .parseClaimsJws(token)
                .getBody();
    }
}

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Bean;
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.core.userdetails.UserDetailsService;
import org.springframework.security.web.authentication.UsernamePasswordAuthenticationFilter;

@EnableWebSecurity
public class SecurityConfig extends WebSecurityConfigurerAdapter {
    @Autowired
    private JwtTokenUtil jwtTokenUtil;

    @Autowired
    private UserDetailsService userDetailsService;

    @Override
    protected void configure(HttpSecurity http) throws Exception {
        JwtTokenFilter jwtTokenFilter = new JwtTokenFilter(jwtTokenUtil, userDetailsService);
        
        http.csrf().disable()
            .authorizeRequests()
            .anyRequest().authenticated()
            .and()
            .addFilterBefore(jwtTokenFilter, UsernamePasswordAuthenticationFilter.class);
    }
}

import io.jsonwebtoken.Claims;
import io.jsonwebtoken.ExpiredJwtException;
import org.springframework.security.authentication.UsernamePasswordAuthenticationToken;
import org.springframework.security.core.Authentication;
import org.springframework.security.core.context.SecurityContextHolder;
import org.springframework.security.core.userdetails.UserDetails;
import org.springframework.security.core.userdetails.UserDetailsService;
import org.springframework.security.web.authentication.WebAuthenticationDetailsSource;
import org.springframework.web.filter.OncePerRequestFilter;

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

public class JwtTokenFilter extends OncePerRequestFilter {
    private JwtTokenUtil jwtTokenUtil;
    private UserDetailsService userDetailsService;

    public JwtTokenFilter(JwtTokenUtil jwtTokenUtil, UserDetailsService userDetailsService) {
        this.jwtTokenUtil = jwtTokenUtil;
        this.userDetailsService = userDetailsService;
    }

    @Override
    protected void doFilterInternal(HttpServletRequest request, HttpServletResponse response, FilterChain chain)
            throws ServletException, IOException {
        String accessToken = request.getHeader("Authorization");
        String username = null;
        Claims claims = null;

        if (accessToken != null && accessToken.startsWith("Bearer ")) {
            accessToken = accessToken.substring(7);
            try {
                claims = jwtTokenUtil.getClaimsFromToken(accessToken);
                username = claims.getSubject();
            } catch (ExpiredJwtException e) {
                // 在這里處理 access_token 過期的情況
                String refreshToken = request.getHeader("Refresh-Token");
                if (refreshToken != null && jwtTokenUtil.validateToken(refreshToken)) {
                    // 驗(yàn)證 refresh_token，如果有效則重新生成 tokens
                    username = jwtTokenUtil.getClaimsFromToken(refreshToken).getSubject();
                    String newAccessToken = jwtTokenUtil.generateAccessToken(username);
                    String newRefreshToken = jwtTokenUtil.generateRefreshToken(username);
                    
                    // 將新的 tokens 放入響應(yīng)頭
                    response.setHeader("Access-Token", newAccessToken);
                    response.setHeader("Refresh-Token", newRefreshToken);
                }
            }
        }

        if (username != null && SecurityContextHolder.getContext().getAuthentication() == null) {
            UserDetails userDetails = this.userDetailsService.loadUserByUsername(username);
            if (jwtTokenUtil.validateToken(accessToken, userDetails)) {
                Authentication authentication = new UsernamePasswordAuthenticationToken(userDetails, null, userDetails.getAuthorities());
                authentication.setDetails(new WebAuthenticationDetailsSource().buildDetails(request));
                SecurityContextHolder.getContext().setAuthentication(authentication);
            }
        }
        chain.doFilter(request, response);
    }
}