SpringSecurity之记住我功能的实现

登录的时候，请求发送给过滤器UsernamePasswordAuthenticationFilter,当该过滤器认证成功后，会调用RememberMeService，会生成一个token，将token写入到浏览器cookie，同时RememberMeService里边还有个TokenRepository，将token和用户信息写入到数据库中。这样当用户再次访问系统，访问某一个接口时，会经过一个RememberMeAuthenticationFilter的过滤器，他会读取cookie中的token，交给RememberService，RememberService会用TokenRepository根据token从数据库中查是否有记录，如果有记录会把用户名取出来，再调用UserDetailService根据用户名获取用户信息，然后放在SecurityContext里。

RememberMeAuthenticationFilter在Spring Security中认证过滤器链的倒数第二个过滤器位置，当其他认证过滤器都没法认证成功的时候，就会调用RememberMeAuthenticationFilter尝试认证。

实现：

1，登录表单加上 ，SpringSecurity在SpringSessionRememberMeServices类里定义了一个常量，默认值就是remember-me

2，根据上边的原理图可知， 要配置TokenRepository， 把生成的token存进数据库，这是一个配置bean的配置，放在了 BrowserSecurityConfig里

3，在configure里配置

4，在BrowserProperties里加上自动登录时间，把记住我时间做成可配置的

//记住我秒数配置 private int rememberMeSeconds = 10;

以下是相关的配置

pom.xml:

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <groupId>urity</groupId>
    <artifactId>demo</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>jar</packaging>
    <name>demo</name>
    <description>Demo project for Spring Boot</description>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.0.3.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <java.version>1.8</java.version>
    </properties>
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        <!-- https://mvnrepository.com/artifact/org.apache.tomcat.embed/tomcat-embed-jasper -->
        <!--配置支持jsp-->
        <dependency>
            <groupId>org.apache.tomcat.embed</groupId>
            <artifactId>tomcat-embed-jasper</artifactId>
            <version>8.5.12</version>
        </dependency>
        <!-- https://mvnrepository.com/artifact/javax.servlet/javax.servlet-api -->
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>javax.servlet-api</artifactId>
            <version>3.1.0</version>
        </dependency>
        <!-- https://mvnrepository.com/artifact/javax.servlet/jstl -->
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>jstl</artifactId>
            <version>1.2</version>
        </dependency>

        <!--添加static和templates的依赖-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-thymeleaf</artifactId>
        </dependency>

        <dependency>
            <!-- 由于我使用的spring boot所以我是引入spring-boot-starter-security而且我使用了spring io所以不需要填写依赖的版本号 -->
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-security</artifactId>
        </dependency>
        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>jcl-over-slf4j</artifactId>
            <version>1.7.25</version>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <version>1.16.22</version>
        </dependency>

        <!--mybatis与mysql-->
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>1.2.0</version>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
        </dependency>
        <!--druid依赖-->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid</artifactId>
            <version>1.0.25</version>
        </dependency>

        <!-- spring social相关 -->
        <dependency>
            <groupId>org.springframework.social</groupId>
            <artifactId>spring-social-config</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.social</groupId>
            <artifactId>spring-social-security</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.social</groupId>
            <artifactId>spring-social-web</artifactId>
        </dependency>
        <!-- https://mvnrepository.com/artifact/org.springframework.security/spring-security-config -->
        <dependency>
            <groupId>org.springframework.security</groupId>
            <artifactId>spring-security-config</artifactId>
            <version>5.0.6.RELEASE</version>
        </dependency>
    </dependencies>
    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>
</project>
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SecurityConfiguration:

package urity.demo.config;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
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.builders.WebSecurity;
import org.springframework.security.config.annotation.web.configuration.WebSecurityConfigurerAdapter;
import org.springframework.security.core.userdetails.UserDetailsService;
import org.springframework.security.crypto.bcrypt.BCryptPasswordEncoder;
import org.springframework.security.crypto.password.PasswordEncoder;
import org.springframework.security.web.authentication.rememberme.JdbcTokenRepositoryImpl;
import org.springframework.security.web.authentication.rememberme.PersistentTokenRepository;

import javax.annotation.Resource;
import javax.sql.DataSource;

@Configuration
public class SecurityConfiguration extends WebSecurityConfigurerAdapter {


    @Resource
    private DataSource dataSource;

    @Resource
    private UserDetailsService myUserDetailsService;

    /**
     * 配置TokenRepository
     *
     * @return
     */
    @Bean
    public PersistentTokenRepository persistentTokenRepository() {
        JdbcTokenRepositoryImpl jdbcTokenRepository = new JdbcTokenRepositoryImpl();
        // 配置数据源
        jdbcTokenRepository.setDataSource(dataSource);
        // 第一次启动的时候自动建表（可以不用这句话，自己手动建表，源码中有语句的）
//         jdbcTokenRepository.setCreateTableOnStartup(true);
        return jdbcTokenRepository;
    }


    // 处理密码加密解密逻辑
    @Bean
    public PasswordEncoder passwordEncoder() {
        return new BCryptPasswordEncoder();
    }


    //验证相关
    @Override
    protected void configure(AuthenticationManagerBuilder auth) throws Exception {
        super.configure(auth);
    }

    //浏览器相关
    @Override
    protected void configure(HttpSecurity http) throws Exception {
        http
                .authorizeRequests()
                .antMatchers("/hello", "/login.html").permitAll()
                .anyRequest().authenticated()
                .and()
                .formLogin()
                //指定登录页的路径
                .loginPage("/hello")
                //指定自定义form表单请求的路径
                .loginProcessingUrl("/authentication/form")
                .failureUrl("/login?error")
                .defaultSuccessUrl("/success")
                //必须允许所有用户访问我们的登录页（例如未验证的用户，否则验证流程就会进入死循环）
                //这个formLogin().permitAll()方法允许所有用户基于表单登录访问/login这个page。
                .permitAll()
                .and()
                .rememberMe()                                   // 记住我相关配置
                .tokenRepository(persistentTokenRepository())
                .tokenValiditySeconds(1209600)
        ;


        //默认都会产生一个hiden标签 里面有安全相关的验证 这边我们不需要 可禁用掉
        http.csrf().disable();

    }
    //web安全相关
    @Override
    public void configure(WebSecurity web) throws Exception {
        super.configure(web);
    }
}
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MyUserDetailService:

package urity.demo.support;

import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.security.core.GrantedAuthority;
import org.springframework.security.core.authority.AuthorityUtils;
import org.springframework.security.core.userdetails.UserDetails;
import org.springframework.security.core.userdetails.UserDetailsService;
import org.springframework.security.core.userdetails.UsernameNotFoundException;
import org.springframework.security.crypto.password.PasswordEncoder;
import org.springframework.stereotype.Component;
import urity.demo.entity.User;
import java.util.ArrayList;
import java.util.List;
import java.util.logging.Logger;

//自定义用户处理的逻辑
//用户的信息的service
@Component
public class MyUserDetailService implements UserDetailsService {
    /**
     * 日志处理类
     */
    private org.slf4j.Logger logger =  LoggerFactory.getLogger(this.getClass());

    @Autowired
    private PasswordEncoder passwordEncoder;


    /**
     * 根据用户名加载用户信息
     *
     * @param username 用户名
     * @return UserDetails
     * @throws UsernameNotFoundException
     */

    @Override
    public UserDetails loadUserByUsername(String username) throws UsernameNotFoundException {
        logger.info("表单登录用户名:" + username);
        System.out.println("表单登录用户名:" + username);
        List<GrantedAuthority> grantedAuthorityList = new ArrayList<>();
        grantedAuthorityList.add(new GrantedAuthority() {
            @Override
            public String getAuthority() {
                return "admin";
            }
        });

       User user = new User();
       user.setUsername("test");
       user.setPassword("123");
        String pWord =passwordEncoder.encode(user.getPassword());
        System.out.println("表单登录加密后密码:" + pWord);
        System.out.println("库中的username:"+user.getUsername());
        if(username.equals(user.getUsername())) {
            MyUser myUser = new MyUser(user.getUsername(), pWord, true, true, true, true, AuthorityUtils.commaSeparatedStringToAuthorityList("admin,ROLE_USER"));
            return myUser;
        }else {
            throw  new UsernameNotFoundException("用户["+username+"]不存在");
        }

    }
}

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MyUser:

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.security.core.CredentialsContainer;
import org.springframework.security.core.GrantedAuthority;
import org.springframework.security.core.SpringSecurityCoreVersion;
import org.springframework.security.core.authority.AuthorityUtils;
import org.springframework.security.core.authority.SimpleGrantedAuthority;
import org.springframework.security.core.userdetails.User;
import org.springframework.security.core.userdetails.UserDetails;
import org.springframework.security.crypto.factory.PasswordEncoderFactories;
import org.springframework.security.crypto.password.PasswordEncoder;
import org.springframework.util.Assert;

import java.io.Serializable;
import java.util.*;
import java.util.function.Function;

public class MyUser implements UserDetails, CredentialsContainer {

    private static final long serialVersionUID = SpringSecurityCoreVersion.SERIAL_VERSION_UID;

    // ~ Instance fields
    // ================================================================================================
    private String password;
    private final String username;
    private final Set<GrantedAuthority> authorities;
    private final boolean accountNonExpired;
    private final boolean accountNonLocked;
    private final boolean credentialsNonExpired;
    private final boolean enabled;

    // ~ Constructors
    // ===================================================================================================

    /**
     * Calls the more complex constructor with all boolean arguments set to {@code true}.
     */
    public MyUser(String username, String password,
                             Collection<? extends GrantedAuthority> authorities) {
        this(username, password, true, true, true, true, authorities);
    }

    /**
     * Construct the <code>User</code> with the details required by
     * {@link org.springframework.security.authentication.dao.DaoAuthenticationProvider}.
     *
     * @param username the username presented to the
     * <code>DaoAuthenticationProvider</code>
     * @param password the password that should be presented to the
     * <code>DaoAuthenticationProvider</code>
     * @param enabled set to <code>true</code> if the user is enabled
     * @param accountNonExpired set to <code>true</code> if the account has not expired
     * @param credentialsNonExpired set to <code>true</code> if the credentials have not
     * expired
     * @param accountNonLocked set to <code>true</code> if the account is not locked
     * @param authorities the authorities that should be granted to the caller if they
     * presented the correct username and password and the user is enabled. Not null.
     *
     * @throws IllegalArgumentException if a <code>null</code> value was passed either as
     * a parameter or as an element in the <code>GrantedAuthority</code> collection
     */
    public MyUser(String username, String password, boolean enabled,
                             boolean accountNonExpired, boolean credentialsNonExpired,
                             boolean accountNonLocked, Collection<? extends GrantedAuthority> authorities) {

        if (((username == null) || "".equals(username)) || (password == null)) {
            throw new IllegalArgumentException(
                    "Cannot pass null or empty values to constructor");
        }

        this.username = username;
        this.password = password;
        this.enabled = enabled;
        this.accountNonExpired = accountNonExpired;
        this.credentialsNonExpired = credentialsNonExpired;
        this.accountNonLocked = accountNonLocked;
        this.authorities = Collections.unmodifiableSet(sortAuthorities(authorities));
    }

    // ~ Methods
    // ========================================================================================================

    public Collection<GrantedAuthority> getAuthorities() {
        return authorities;
    }

    public String getPassword() {
        return password;
    }

    public String getUsername() {
        return username;
    }

    public boolean isEnabled() {
        return enabled;
    }

    public boolean isAccountNonExpired() {
        return accountNonExpired;
    }

    public boolean isAccountNonLocked() {
        return accountNonLocked;
    }

    public boolean isCredentialsNonExpired() {
        return credentialsNonExpired;
    }

    public void eraseCredentials() {
        password = null;
    }

    private static SortedSet<GrantedAuthority> sortAuthorities(
            Collection<? extends GrantedAuthority> authorities) {
        Assert.notNull(authorities, "Cannot pass a null GrantedAuthority collection");
        // Ensure array iteration order is predictable (as per
        // UserDetails.getAuthorities() contract and SEC-717)
        SortedSet<GrantedAuthority> sortedAuthorities = new TreeSet<GrantedAuthority>(
                new MyUser.AuthorityComparator());

        for (GrantedAuthority grantedAuthority : authorities) {
            Assert.notNull(grantedAuthority,
                    "GrantedAuthority list cannot contain any null elements");
            sortedAuthorities.add(grantedAuthority);
        }

        return sortedAuthorities;
    }

    private static class AuthorityComparator implements Comparator<GrantedAuthority>,
            Serializable {
        private static final long serialVersionUID = SpringSecurityCoreVersion.SERIAL_VERSION_UID;

        public int compare(GrantedAuthority g1, GrantedAuthority g2) {
            // Neither should ever be null as each entry is checked before adding it to
            // the set.
            // If the authority is null, it is a custom authority and should precede
            // others.
            if (g2.getAuthority() == null) {
                return -1;
            }

            if (g1.getAuthority() == null) {
                return 1;
            }

            return g1.getAuthority().compareTo(g2.getAuthority());
        }
    }

    /**
     * Returns {@code true} if the supplied object is a {@code User} instance with the
     * same {@code username} value.
     * <p>
     * In other words, the objects are equal if they have the same username, representing
     * the same principal.
     */
    @Override
    public boolean equals(Object rhs) {
        if (rhs instanceof MyUser) {
            return username.equals(((MyUser) rhs).username);
        }
        return false;
    }

    /**
     * Returns the hashcode of the {@code username}.
     */
    @Override
    public int hashCode() {
        return username.hashCode();
    }

    @Override
    public String toString() {
        StringBuilder sb = new StringBuilder();
        sb.append(super.toString()).append(": ");
        sb.append("Username: ").append(this.username).append("; ");
        sb.append("Password: [PROTECTED]; ");
        sb.append("Enabled: ").append(this.enabled).append("; ");
        sb.append("AccountNonExpired: ").append(this.accountNonExpired).append("; ");
        sb.append("credentialsNonExpired: ").append(this.credentialsNonExpired)
                .append("; ");
        sb.append("AccountNonLocked: ").append(this.accountNonLocked).append("; ");

        if (!authorities.isEmpty()) {
            sb.append("Granted Authorities: ");

            boolean first = true;
            for (GrantedAuthority auth : authorities) {
                if (!first) {
                    sb.append(",");
                }
                first = false;

                sb.append(auth);
            }
        }
        else {
            sb.append("Not granted any authorities");
        }

        return sb.toString();
    }

    public static MyUser.UserBuilder withUsername(String username) {
        return new MyUser.UserBuilder().username(username);
    }

    /**
     * Builds the user to be added. At minimum the username, password, and authorities
     * should provided. The remaining attributes have reasonable defaults.
     */
    public static class UserBuilder {
        private String username;
        private String password;
        private List<GrantedAuthority> authorities;
        private boolean accountExpired;
        private boolean accountLocked;
        private boolean credentialsExpired;
        private boolean disabled;

        /**
         * Creates a new instance
         */
        private UserBuilder() {
        }

        /**
         * Populates the username. This attribute is required.
         *
         * @param username the username. Cannot be null.
         * @return the {@link User.UserBuilder} for method chaining (i.e. to populate
         * additional attributes for this user)
         */
        private MyUser.UserBuilder username(String username) {
            Assert.notNull(username, "username cannot be null");
            this.username = username;
            return this;
        }

        /**
         * Populates the password. This attribute is required.
         *
         * @param password the password. Cannot be null.
         * @return the {@link User.UserBuilder} for method chaining (i.e. to populate
         * additional attributes for this user)
         */
        public MyUser.UserBuilder password(String password) {
            Assert.notNull(password, "password cannot be null");
            this.password = password;
            return this;
        }

        /**
         * Populates the roles. This method is a shortcut for calling
         * {@link #authorities(String...)}, but automatically prefixes each entry with
         * "ROLE_". This means the following:
         *
         * <code>
         *     builder.roles("USER","ADMIN");
         * </code>
         *
         * is equivalent to
         *
         * <code>
         *     builder.authorities("ROLE_USER","ROLE_ADMIN");
         * </code>
         *
         * <p>
         * This attribute is required, but can also be populated with
         * {@link #authorities(String...)}.
         * </p>
         *
         * @param roles the roles for this user (i.e. USER, ADMIN, etc). Cannot be null,
         * contain null values or start with "ROLE_"
         * @return the {@link User.UserBuilder} for method chaining (i.e. to populate
         * additional attributes for this user)
         */
        public MyUser.UserBuilder roles(String... roles) {
            List<GrantedAuthority> authorities = new ArrayList<GrantedAuthority>(
                    roles.length);
            for (String role : roles) {
                Assert.isTrue(!role.startsWith("ROLE_"), role
                        + " cannot start with ROLE_ (it is automatically added)");
                authorities.add(new SimpleGrantedAuthority("ROLE_" + role));
            }
            return authorities(authorities);
        }

        /**
         * Populates the authorities. This attribute is required.
         *
         * @param authorities the authorities for this user. Cannot be null, or contain
         * null values
         * @return the {@link User.UserBuilder} for method chaining (i.e. to populate
         * additional attributes for this user)
         * @see #roles(String...)
         */
        public MyUser.UserBuilder authorities(GrantedAuthority... authorities) {
            return authorities(Arrays.asList(authorities));
        }

        /**
         * Populates the authorities. This attribute is required.
         *
         * @param authorities the authorities for this user. Cannot be null, or contain
         * null values
         * @return the {@link User.UserBuilder} for method chaining (i.e. to populate
         * additional attributes for this user)
         * @see #roles(String...)
         */
        public MyUser.UserBuilder authorities(List<? extends GrantedAuthority> authorities) {
            this.authorities = new ArrayList<GrantedAuthority>(authorities);
            return this;
        }

        /**
         * Populates the authorities. This attribute is required.
         *
         * @param authorities the authorities for this user (i.e. ROLE_USER, ROLE_ADMIN,
         * etc). Cannot be null, or contain null values
         * @return the {@link User.UserBuilder} for method chaining (i.e. to populate
         * additional attributes for this user)
         * @see #roles(String...)
         */
        public MyUser.UserBuilder authorities(String... authorities) {
            return authorities(AuthorityUtils.createAuthorityList(authorities));
        }

        /**
         * Defines if the account is expired or not. Default is false.
         *
         * @param accountExpired true if the account is expired, false otherwise
         * @return the {@link User.UserBuilder} for method chaining (i.e. to populate
         * additional attributes for this user)
         */
        public MyUser.UserBuilder accountExpired(boolean accountExpired) {
            this.accountExpired = accountExpired;
            return this;
        }

        /**
         * Defines if the account is locked or not. Default is false.
         *
         * @param accountLocked true if the account is locked, false otherwise
         * @return the {@link User.UserBuilder} for method chaining (i.e. to populate
         * additional attributes for this user)
         */
        public MyUser.UserBuilder accountLocked(boolean accountLocked) {
            this.accountLocked = accountLocked;
            return this;
        }

        /**
         * Defines if the credentials are expired or not. Default is false.
         *
         * @param credentialsExpired true if the credentials are expired, false otherwise
         * @return the {@link User.UserBuilder} for method chaining (i.e. to populate
         * additional attributes for this user)
         */
        public MyUser.UserBuilder credentialsExpired(boolean credentialsExpired) {
            this.credentialsExpired = credentialsExpired;
            return this;
        }

        /**
         * Defines if the account is disabled or not. Default is false.
         *
         * @param disabled true if the account is disabled, false otherwise
         * @return the {@link User.UserBuilder} for method chaining (i.e. to populate
         * additional attributes for this user)
         */
        public MyUser.UserBuilder disabled(boolean disabled) {
            this.disabled = disabled;
            return this;
        }

        public UserDetails build() {
            return new User(username, password, !disabled, !accountExpired,
                    !credentialsExpired, !accountLocked, authorities);
        }
    }
    }
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login.html:

<!DOCTYPE html>
<html lang="en" xmlns:th="http://www.w3.org/1999/xhtml">
<head>
    <meta charset="UTF-8">
    <title>第一个HTML页面</title>
</head>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>

自定义表单验证:
<!--<form name="f" action="/login" method="post">-->
<!-- <form name="f" action="/authentication/form" method="post">-->
<form name="f" action="/authentication/form" method="post">
    <br/>
    用户名:
    <input type="text" name="username" placeholder="name"><br/>
    密码:
    <input type="password" name="password" placeholder="password"><br/>
    <input type="checkbox" name="remember-me" value="true">记住我<br/>
    <input name="submit" type="submit" value="提交">
</form>
</body>
</html>
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LoginController:

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import urity.demo.entity.User;
@Controller
public class LoginController {

    @RequestMapping("/hello")
    public String hello() {
        System.out.println("kkkk==");
        return "login";
    }

    @RequestMapping("/success")
    public String success(){

        return "success";
    }

    @RequestMapping("/forkl")
    public String check(User user){
        System.out.println(user);
        return "success";
    }

    @RequestMapping("/user")
    public String fuinduser(){
       return "user";
    }
}

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user.html:

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
由于用了记住我 所以现在可以直接访问了哦!
</body>
</html>
复制代码

到此我们来启动项目,首次访问http://localhost:8787/user会需要我们登录,这里我们进行登录先不勾选记住我:

登录成功后可以正常访问user,然后我们关闭浏览器重新打开 访问http://localhost:8787/user会被返回到登录的页面,这个就是没有任何效果的演示.

然后我们再次登录,并勾选记住我:

这里我们登录成功后关闭浏览器再打开 仍然可以访问http://localhost:8787/user,而且不需要登录:

这里浏览器做了如下的事情:

• 在我们数据库建立表并插入数据

• 然后我们关闭浏览器在访问,它会去库里面查找响应的token,如果有就不用登录直接访问:

到此,rememberme的功能就完成了