<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-security</artifactId>
</dependency>

package com.demo.config;

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.configuration.EnableWebSecurity;
import org.springframework.security.config.annotation.web.configuration.WebSecurityConfiguration;
import org.springframework.security.core.userdetails.UserDetails;
import org.springframework.security.core.userdetails.UsernameNotFoundException;

@EnableWebSecurity
public class Security extends WebSecurityConfiguration {
    protected void configure(HttpSecurity http) throws Exception {
        http.authorizeRequests()
                .antMatchers("/public/**").permitAll() // 允許訪問公開路徑
                .antMatchers("/public/index").hasRole("vip") // 需要指定用戶在可以使用
                .antMatchers("/admin/**").hasRole("admin") // 需要指定用戶在可以使用
                .anyRequest().authenticated() // 其他請(qǐng)求需要認(rèn)證
                .and()
                .formLogin() // 使用表單登錄
                .loginPage("/login") // 指定登錄頁面
                .permitAll() // 允許所有用戶訪問登錄頁面
                .and()
                .logout() // 配置注銷
                .logoutUrl("/logout") // 注銷路徑
                .logoutSuccessUrl("/login?logout") // 注銷成功后跳轉(zhuǎn)的頁面
                .permitAll();

    }
    //緩存中
    protected void configure(AuthenticationManagerBuilder auth) throws Exception {
        auth.inMemoryAuthentication()
                //添加  名字為 admin  密碼 為 admin123 的用戶 基于權(quán)限 ADMIN
                .withUser("admin").password("admin123").roles("ADMIN")
                .and()
                .withUser("user").password("user123").roles("USER");
    }
    //從數(shù)據(jù)庫中
    public UserDetails loadUserByUsername(String username) throws UsernameNotFoundException {
        // 從數(shù)據(jù)庫或其他數(shù)據(jù)源加載用戶信息
        // 這里簡(jiǎn)單起見，直接使用內(nèi)存中的用戶信息
        if ("admin".equals(username)) {
            return org.springframework.security.core.userdetails.User.builder()
                    .username("admin")
                    .password("{noop}admin") // {noop}表示不加密，實(shí)際項(xiàng)目中應(yīng)該使用加密的密碼
                    .roles("ADMIN")
                    .build();
        } else if ("user".equals(username)) {
            return org.springframework.security.core.userdetails.User.builder()
                    .username("user")
                    .password("{noop}user")
                    .roles("USER")
                    .build();
        } else {
            throw new UsernameNotFoundException("User not found");
        }
    }
}

import org.springframework.security.access.annotation.Secured;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.GetMapping;

@Controller
public class MyController {

    @GetMapping("/user")
    @Secured("ROLE_USER") // 要求用戶具有ROLE_USER角色才能訪問
    public String userPage() {
        return "user";
    }
}

import org.springframework.security.access.prepost.PreAuthorize;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.GetMapping;

@Controller
public class MyController {

    @GetMapping("/admin")
    @PreAuthorize("hasRole('ADMIN')") // 要求用戶具有ROLE_ADMIN角色才能訪問
    public String adminPage() {
        return "admin";
    }

    @GetMapping("/user")
    @PreAuthorize("hasRole('USER')") // 要求用戶具有ROLE_USER角色才能訪問
    public String userPage() {
        return "user";
    }
}