记住我是一项功能, 允许用户无需重新登录即可访问应用程序。用户的登录会话在关闭浏览器后终止, 并且如果用户再次通过打开浏览器访问该应用程序, 则提示登录。
但是我们可以使用”记住我”功能来避免重新登录。它将用户的身份存储到Cookie或数据库中, 并用于标识用户。
我们将其实现到以下示例中。让我们来看一个例子。
创建一个Maven项目
首先创建一个Maven项目并提供项目详细信息。
最初, 项目如下所示:
Spring安全配置
配置项目以实现spring安全。它需要以下四个Java文件。首先创建一个包com.srcmini并将所有文件放入其中。
// AppConfig.java
package com.srcmini;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.EnableWebMvc;
import org.springframework.web.servlet.view.InternalResourceViewResolver;
import org.springframework.web.servlet.view.JstlView;
@EnableWebMvc
@Configuration
@ComponentScan({ "com.srcmini.controller.*" })
public class AppConfig {
@Bean
public InternalResourceViewResolver viewResolver() {
InternalResourceViewResolver viewResolver
= new InternalResourceViewResolver();
viewResolver.setViewClass(JstlView.class);
viewResolver.setPrefix("/WEB-INF/views/");
viewResolver.setSuffix(".jsp");
return viewResolver;
}
}
// MvcWebApplicationInitializer.java
package com.srcmini;
import org.springframework.web.servlet.support.AbstractAnnotationConfigDispatcherServletInitializer;
public class MvcWebApplicationInitializer extends
AbstractAnnotationConfigDispatcherServletInitializer {
@Override
protected Class<?>[] getRootConfigClasses() {
return new Class[] { WebSecurityConfig.class };
}
@Override
protected Class<?>[] getServletConfigClasses() {
// TODO Auto-generated method stub
return null;
}
@Override
protected String[] getServletMappings() {
return new String[] { "/" };
}
}
// SecurityWebApplicationInitializer.java
package com.srcmini;
import org.springframework.security.web.context.*;
public class SecurityWebApplicationInitializer
extends AbstractSecurityWebApplicationInitializer {
}
// WebSecurityConfig.java
在此类中, 我们还将创建用户并进行身份验证。 configure()方法内部的RememberMe()方法负责记住和存储用户身份。
package com.srcmini;
import org.springframework.context.annotation.*;
import org.springframework.security.config.annotation.web.builders.HttpSecurity;
import org.springframework.security.config.annotation.web.configuration.*;
import org.springframework.security.core.userdetails.*;
import org.springframework.security.provisioning.InMemoryUserDetailsManager;
import org.springframework.security.web.util.matcher.AntPathRequestMatcher;
@EnableWebSecurity
@ComponentScan("com.srcmini")
public class WebSecurityConfig extends WebSecurityConfigurerAdapter {
@Bean
public UserDetailsService userDetailsService() {
InMemoryUserDetailsManager manager = new InMemoryUserDetailsManager();
manager.createUser(User.withDefaultPasswordEncoder()
.username("admin").password("admin123").roles("ADMIN").build());
return manager;
}
@Override
protected void configure(HttpSecurity http) throws Exception {
http.authorizeRequests().
antMatchers("/index", "/user", "/").permitAll()
.antMatchers("/admin").authenticated()
.and()
.formLogin()
.loginPage("/login")
.and()
.rememberMe()
.key("rem-me-key")
.rememberMeParameter("remember") // it is name of checkbox at login page
.rememberMeCookieName("rememberlogin") // it is name of the cookie
.tokenValiditySeconds(100) // remember for number of seconds
.and()
.logout()
.logoutRequestMatcher(new AntPathRequestMatcher("/logout"));
}
}
控制者
在com.srcmini.controller包内创建一个控制器HomeController。请参阅控制器代码。
// HomeController.java
package com.srcmini.controller;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
@Controller
public class HomeController {
@RequestMapping(value = "/", method = RequestMethod.GET)
public String index() {
return "index";
}
@RequestMapping(value = "/login", method = RequestMethod.GET)
public String login() {
return "login";
}
@RequestMapping(value = "/admin", method = RequestMethod.GET)
public String admin() {
return "admin";
}
}
视图
创建视图(JSP页面)以将输出产生到浏览器。
// index.jsp
<html>
<head>
<title>Home Page</title>
</head>
<body>
Welcome to srcmini! <br> <br>
<a href="admin">Admin login</a>
</body>
</html>
// admin.jsp
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Home Page</title>
</head>
<body>
Welcome Admin! ?
<a href="logout">logout</a>
</body>
</html>
// login.jsp
这是我们的自定义登录页面, 在其中添加了”记住我”复选框。参见代码。
<%@ taglib
prefix="c"
uri="http://java.sun.com/jsp/jstl/core"
%>
<c:url value="/login" var="loginUrl"/>
<form action="${loginUrl}" method="post">
<c:if test="${param.error != null}">
<p>
Invalid username and password.
</p>
</c:if>
<c:if test="${param.logout != null}">
<p>
You have been logged out.
</p>
</c:if>
<p>
<label for="username">Username</label>
<input type="text" id="username" name="username"/>
</p>
<p>
<label for="password">Password</label>
<input type="password" id="password" name="password"/>
</p>
<p>
<label for="remember"> Remember me</label>
<input type="checkbox" name="remember" />
</p>
<input type="hidden"
name="${_csrf.parameterName}"
value="${_csrf.token}"/>
<button type="submit" class="btn">Log in</button>
</form>
项目依赖
以下是我们的pom.xml文件, 其中包含所有必需的依赖项。
// pom.xml
<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>com.srcmini</groupId>
<artifactId>springrememberme</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>war</packaging>
<properties>
<maven.compiler.target>1.8</maven.compiler.target>
<maven.compiler.source>1.8</maven.compiler.source>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-webmvc</artifactId>
<version>5.0.2.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework.security</groupId>
<artifactId>spring-security-web</artifactId>
<version>5.0.0.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework.security</groupId>
<artifactId>spring-security-core</artifactId>
<version>5.0.4.RELEASE</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.springframework.security/spring-security-config -->
<dependency>
<groupId>org.springframework.security</groupId>
<artifactId>spring-security-config</artifactId>
<version>5.0.4.RELEASE</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>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>jstl</artifactId>
<version>1.2</version>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-war-plugin</artifactId>
<version>2.6</version>
<configuration>
<failOnMissingWebXml>false</failOnMissingWebXml>
</configuration>
</plugin>
</plugins>
</build>
</project>
项目结构
添加所有文件后, 项目结构如下所示:
运行服务器
输出
单击管理员登录链接并登录。
瞧, 我们已经点击了记住我复选框。
复制URL:http:// localhost:8080 / springrememberme / admin并完全关闭浏览器。在第二次打开浏览器后, 粘贴复制的URL。
请参阅, 它不要求登录, 也不需要我们登录同一页面。因为我们确实在登录时检查了”记住我”按钮。
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