spring:
  datasource:
    url: jdbc:mysql://localhost:3306/db-security?useUnicode=true&characterEncoding=utf-8&useSSL=false&serverTimezone=GMT
    username: root
    password: syc
  security:
    remember-me:
      key: yyg

@EnableWebSecurity(debug = true)
public class SecurityConfig extends WebSecurityConfigurerAdapter {
 
    @Value("${spring.security.remember-me.key}")
    private String rememberKey;
 
    @Autowired
    private UserDetailsService userDetailsService;
 
    @Override
    protected void configure(HttpSecurity http) throws Exception {
        //利用JdbcTokenRepositoryImpl關(guān)聯(lián)數(shù)據(jù)源
        JdbcTokenRepositoryImpl tokenRepository = new JdbcTokenRepositoryImpl();
        tokenRepository.setDataSource(dataSource);
 
        http.authorizeRequests()
                .antMatchers("/admin/**")
                .hasRole("ADMIN")
                .antMatchers("/user/**")
                .hasRole("USER")
                .antMatchers("/app/**")
                .permitAll()
                .anyRequest()
                .authenticated()
                .and()
                .formLogin()
                .permitAll()
                .and()
            	//開啟“記住我”功能
                .rememberMe()
                .userDetailsService(userDetailsService)
                //配置散列加密用的key
                .key(rememberKey)
                .and()
                .csrf()
                .disable();
    }
 
    @Bean
    public PasswordEncoder passwordEncoder() {
        //不對登錄密碼進(jìn)行加密
        return NoOpPasswordEncoder.getInstance();
    }
    
}

@RestController
@RequestMapping("/user")
public class UserController {
 
    @GetMapping("hello")
    public String hello() {
 
        return "hello, user";
    }
 
}

//對各字段進(jìn)行散列加密
hashInfo=md5Hex(username +":"+expirationTime +":"password+":"+key)

//利用base64進(jìn)行解碼
rememberCookie=base64(username+":"+expirationrime+":"+hashInfo)

@Override
public void onLoginSuccess(HttpServletRequest request, HttpServletResponse response,
  Authentication successfulAuthentication) {
    //從認(rèn)證對象中獲取用戶名
 	String username = retrieveUserName(successfulAuthentication);
    //從認(rèn)證對象中獲取密碼
 	String password = retrievePassword(successfulAuthentication);
    
    ......
    
 	if (!StringUtils.hasLength(password)) {
        //根據(jù)用戶名查詢出對應(yīng)的用戶
 	 	UserDetails user = getUserDetailsService().loadUserByUsername(username);
        //獲取到用戶身上的密碼
  		password = user.getPassword();
 	}
    
    //獲取登錄過期時間，默認(rèn)是2周
 	int tokenLifetime = calculateLoginLifetime(request, successfulAuthentication);
 	long expiryTime = System.currentTimeMillis();
 	expiryTime += 1000L * (tokenLifetime < 0 ? TWO_WEEKS_S : tokenLifetime);
    
    //生成remember-me簽名信息
 	String signatureValue = makeTokenSignature(expiryTime, username, password);
    
    //保存cookie
 	setCookie(new String[] { username, Long.toString(expiryTime), signatureValue },
    tokenLifetime, request, response);
}
 
protected String makeTokenSignature(long tokenExpiryTime, String username,
  String password) {
 	String data = username + ":" + tokenExpiryTime + ":" + password + ":" + getKey();
 	MessageDigest digest;
 	digest = MessageDigest.getInstance("MD5");
 	return new String(Hex.encode(digest.digest(data.getBytes())));
}

public void doFilter(ServletRequest req, ServletResponse res, FilterChain chain)
			throws IOException, ServletException {
		HttpServletRequest request = (HttpServletRequest) req;
		HttpServletResponse response = (HttpServletResponse) res;
 
		if (SecurityContextHolder.getContext().getAuthentication() == null) {
            //處理自動登錄的業(yè)務(wù)邏輯
			Authentication rememberMeAuth = rememberMeServices.autoLogin(request,
					response);
 
			if (rememberMeAuth != null) {
				// Attempt authenticaton via AuthenticationManager
				try {
					rememberMeAuth = authenticationManager.authenticate(rememberMeAuth);
 
					// Store to SecurityContextHolder
					SecurityContextHolder.getContext().setAuthentication(rememberMeAuth);
 
					onSuccessfulAuthentication(request, response, rememberMeAuth);
 
					if (logger.isDebugEnabled()) {
						logger.debug("SecurityContextHolder populated with remember-me token: '"
								+ SecurityContextHolder.getContext().getAuthentication()
								+ "'");
					}
 
					// Fire event
					if (this.eventPublisher != null) {
						eventPublisher
								.publishEvent(new InteractiveAuthenticationSuccessEvent(
										SecurityContextHolder.getContext()
												.getAuthentication(), this.getClass()));
					}
 
					if (successHandler != null) {
						successHandler.onAuthenticationSuccess(request, response,
								rememberMeAuth);
 
						return;
					}
 
				}
				catch (AuthenticationException authenticationException) {
					if (logger.isDebugEnabled()) {
						logger.debug(
								"SecurityContextHolder not populated with remember-me token, as "
										+ "AuthenticationManager rejected Authentication returned by RememberMeServices: '"
										+ rememberMeAuth
										+ "'; invalidating remember-me token",
								authenticationException);
					}
 
					rememberMeServices.loginFail(request, response);
 
					onUnsuccessfulAuthentication(request, response,
							authenticationException);
				}
			}
 
			chain.doFilter(request, response);
		}
		else {
			if (logger.isDebugEnabled()) {
				logger.debug("SecurityContextHolder not populated with remember-me token, as it already contained: '"
						+ SecurityContextHolder.getContext().getAuthentication() + "'");
			}
 
			chain.doFilter(request, response);
		}
	}

    @Override
	public final Authentication autoLogin(HttpServletRequest request,
			HttpServletResponse response) {
		String rememberMeCookie = extractRememberMeCookie(request);
 
		if (rememberMeCookie == null) {
			return null;
		}
 
		logger.debug("Remember-me cookie detected");
 
		if (rememberMeCookie.length() == 0) {
			logger.debug("Cookie was empty");
			cancelCookie(request, response);
			return null;
		}
 
		UserDetails user = null;
 
		try {
			String[] cookieTokens = decodeCookie(rememberMeCookie);
			user = processAutoLoginCookie(cookieTokens, request, response);
			userDetailsChecker.check(user);
 
			logger.debug("Remember-me cookie accepted");
 
			return createSuccessfulAuthentication(request, user);
		}
		......
 
		cancelCookie(request, response);
		return null;
	}