1、pom.xml文件配置

<dependency>
    <groupId>io.jsonwebtoken</groupId>
    <artifactId>jjwt</artifactId>
    <version>0.9.0</version>
</dependency>

2、验证检查解析Token的代码(TokenHelper)

import io.jsonwebtoken.Claims;
import io.jsonwebtoken.Jwts;
import io.jsonwebtoken.SignatureAlgorithm;
import java.util.Date;
import java.util.HashMap;
import java.util.Map;
import javax.servlet.http.HttpServletRequest;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.security.core.userdetails.UserDetails;
import org.springframework.stereotype.Component;
import com.test.dfx.common.TimeProvider;
import com.test.dfx.model.LicenseDetail;
import com.test.dfx.model.User;
@Component
public class TokenHelper {
    protected final Log LOGGER = LogFactory.getLog(getClass());
    @Value("${app.name}")
    private String APP_NAME;
    @Value("${jwt.secret}")
    public String SECRET;    // 用于生成密钥的密钥。从属性文件得到它
    @Value("${jwt.expires_in}")
    private int EXPIRES_IN;  //  can specify time for token to expire. 
    @Value("${jwt.header}")
    private String AUTH_HEADER;
    @Autowired
    TimeProvider timeProvider;
    private SignatureAlgorithm SIGNATURE_ALGORITHM = SignatureAlgorithm.HS512;  // JWT Algorithm for encryption
    public Date getIssuedAtDateFromToken(String token) {
        Date issueAt;
        try {
            final Claims claims = this.getAllClaimsFromToken(token);
            issueAt = claims.getIssuedAt();
        } catch (Exception e) {
            LOGGER.error("Could not get IssuedDate from passed token");
            issueAt = null;
        }
        return issueAt;
    }
    public String getAudienceFromToken(String token) {
        String audience;
        try {
            final Claims claims = this.getAllClaimsFromToken(token);
            audience = claims.getAudience();
        } catch (Exception e) {
            LOGGER.error("Could not get Audience from passed token");
            audience = null;
        }
        return audience;
    }
    public String refreshToken(String token) {
        String refreshedToken;
        Date a = timeProvider.now();
        try {
            final Claims claims = this.getAllClaimsFromToken(token);
            claims.setIssuedAt(a);
            refreshedToken = Jwts.builder()
                .setClaims(claims)
                .setExpiration(generateExpirationDate())
                .signWith( SIGNATURE_ALGORITHM, SECRET )
                .compact();
        } catch (Exception e) {
            LOGGER.error("Could not generate Refresh Token from passed token");
            refreshedToken = null;
        }
        return refreshedToken;
    }
    public String generateToken(String username) {
        String audience = generateAudience();
        return Jwts.builder()
                .setIssuer( APP_NAME )
                .setSubject(username)
                .setAudience(audience)
                .setIssuedAt(timeProvider.now())
                .setExpiration(generateExpirationDate())
                .signWith( SIGNATURE_ALGORITHM, SECRET )
                .compact();
    }

    private Claims getAllClaimsFromToken(String token) {
        Claims claims;
        try {
            claims = Jwts.parser()
                    .setSigningKey(SECRET)
                    .parseClaimsJws(token)
                    .getBody();
        } catch (Exception e) {
            LOGGER.error("Could not get all claims Token from passed token");
            claims = null;
        }
        return claims;
    }
    private Date generateExpirationDate() {
        long expiresIn = EXPIRES_IN;
        return new Date(timeProvider.now().getTime() + expiresIn * 1000);
    }
    public int getExpiredIn() {
        return EXPIRES_IN;
    }
    public Boolean validateToken(String token, UserDetails userDetails) {
        User user = (User) userDetails;
        final String username = getUsernameFromToken(token);
        final Date created = getIssuedAtDateFromToken(token);
        return (
                username != null &&
                username.equals(userDetails.getUsername()) &&
                        !isCreatedBeforeLastPasswordReset(created, user.getLastPasswordResetDate())
        );
    }
    private Boolean isCreatedBeforeLastPasswordReset(Date created, Date lastPasswordReset) {
        return (lastPasswordReset != null && created.before(lastPasswordReset));
    }
    public String getToken( HttpServletRequest request ) {
        /**
         *  Getting the token from Authentication header
         *  e.g Bearer your_token
         */
        String authHeader = getAuthHeaderFromHeader( request );
        if ( authHeader != null && authHeader.startsWith("Bearer ")) {
            return authHeader.substring(7);
        }
        return null;
    }
    public String getAuthHeaderFromHeader( HttpServletRequest request ) {
        return request.getHeader(AUTH_HEADER);
    }
}

3、Spring Security 代码中添加JWT验证

@Override
    protected void configure(HttpSecurity http) throws Exception {
        http
        .sessionManagement().sessionCreationPolicy( SessionCreationPolicy.STATELESS ).and()
        .exceptionHandling().authenticationEntryPoint( restAuthenticationEntryPoint ).and()
        .authorizeRequests()
        .antMatchers("/auth/**").permitAll()
        .antMatchers("/login").permitAll()
        .antMatchers("/home").permitAll()
        .antMatchers("/actuator/**").permitAll()
        .anyRequest().authenticated().and()
        .addFilterBefore(new TokenAuthenticationFilter(tokenHelper, jwtUserDetailsService), BasicAuthenticationFilter.class);
        http.csrf().disable();
    }

4、权限登陆验证过滤器(TokenAuthenticationFilter)

验证每次会话的token

package com.test.dfx.security;
import java.io.IOException;
import javax.servlet.FilterChain;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.security.core.context.SecurityContextHolder;
import org.springframework.security.core.userdetails.UserDetails;
import org.springframework.security.core.userdetails.UserDetailsService;
import org.springframework.web.filter.OncePerRequestFilter;
public class TokenAuthenticationFilter extends OncePerRequestFilter {
    protected final Log logger = LogFactory.getLog(getClass());
    private TokenHelper tokenHelper;
    private UserDetailsService userDetailsService;
    public TokenAuthenticationFilter(TokenHelper tokenHelper, UserDetailsService userDetailsService) {
        this.tokenHelper = tokenHelper;
        this.userDetailsService = userDetailsService;
    }

    @Override
    public void doFilterInternal(
            HttpServletRequest request,
            HttpServletResponse response,
            FilterChain chain
    ) throws IOException, ServletException {
        String username;
        String authToken = tokenHelper.getToken(request);
        logger.info("AuthToken: "+authToken);
        if (authToken != null) {
            // get username from token
            username = tokenHelper.getUsernameFromToken(authToken);
            logger.info("UserName: "+username);
            if (username != null) {
                // get user
                UserDetails userDetails = userDetailsService.loadUserByUsername(username);
                if (tokenHelper.validateToken(authToken, userDetails)) {
                    // 创建身份验证
                    TokenBasedAuthentication authentication = new TokenBasedAuthentication(userDetails);
                    authentication.setToken(authToken);
                    SecurityContextHolder.getContext().setAuthentication(authentication);
                }
            }else{
                logger.error("Something is wrong with Token.");
            }
        }
        chain.doFilter(request, response);
    }

}