部分引自 www.javaboy.org
在 SecurityConfig 上添加注解

@Configuration
@EnableGlobalMethodSecurity(prePostEnabled = true,securedEnabled = true)
public class SecurityConfig extends WebSecurityConfigurerAdapter {
    @Override
    protected void configure(AuthenticationManagerBuilder auth) throws Exception {
        auth.inMemoryAuthentication()
                .withUser("yzn").password("$2a$10$WuUO9k/3LfTGzMEAKxNtAenttd9ulTq7wTj17ojqbU44Q5rwN/mWu").roles("admin")
                .and()
                .withUser("test").password("$2a$10$WuUO9k/3LfTGzMEAKxNtAenttd9ulTq7wTj17ojqbU44Q5rwN/mWu").roles("user");
    }

    @Bean
    PasswordEncoder passwordEncoder(){
        return new BCryptPasswordEncoder();
    }

    @Override
    protected void configure(HttpSecurity http) throws Exception {
        http.authorizeRequests()
                .antMatchers("/admin/**").hasRole("admin")
                .antMatchers("/user/**").hasAnyRole("admin", "user")
                .anyRequest().authenticated()
                .and()
                .formLogin()
                // 登录处理接口
                .loginProcessingUrl("/doLogin")
                // 定义登录页面，未登录时，访问一个需要登录之后才能访问的接口，会自动跳转到该页面
                .loginPage("/login")
                //定义登录时，用户名的 key，默认为 username
                .usernameParameter("uname")
                //定义登录时，用户密码的 key，默认为 password
                .passwordParameter("passwd")
                //登录成功的处理器
                .successHandler(new AuthenticationSuccessHandler() {
                    @Override
                    public void onAuthenticationSuccess(HttpServletRequest req, HttpServletResponse res, Authentication authentication) throws IOException, ServletException {
                        res.setContentType("application/json;charset=utf-8");
                        PrintWriter out = res.getWriter();
                        Map<String,Object> map = new HashMap();
                        map.put("status", 200);
                        // authentication.getPrincipal() 可以把登录者信息取出来
                        map.put("msg", authentication.getPrincipal());
                        out.write(new ObjectMapper().writeValueAsString(map));
                        out.flush();
                    }
                })
                .failureHandler(new AuthenticationFailureHandler() {
                    @Override
                    public void onAuthenticationFailure(HttpServletRequest req, HttpServletResponse res, AuthenticationException e) throws IOException, ServletException {
                        res.setContentType("application/json;charset=utf-8");
                        PrintWriter out = res.getWriter();
                        Map<String,Object> map = new HashMap();
                        map.put("status", 200);
                        map.put("msg", "failed");
                        out.write(new ObjectMapper().writeValueAsString(map));
                        out.flush();
                    }
                })
                //和表单登录相关的接口统统都直接通过
                .permitAll()
                .and()
                .logout()
                .logoutUrl("/logout")
                .logoutSuccessHandler(new LogoutSuccessHandler() {
                    @Override
                    public void onLogoutSuccess(HttpServletRequest req, HttpServletResponse res, Authentication authentication) throws IOException, ServletException {
                        res.setContentType("application/json;charset=utf-8");
                        PrintWriter out = res.getWriter();
                        Map<String,Object> map = new HashMap();
                        map.put("status", 200);
                        map.put("msg", "注销登录成功");
                        out.write(new ObjectMapper().writeValueAsString(map));
                        out.flush();
                    }
                })
                .and()
                .csrf().disable();
    }
}

添加Service

package org.javaboy.security.service;

import org.springframework.security.access.annotation.Secured;
import org.springframework.security.access.prepost.PreAuthorize;
import org.springframework.stereotype.Service;

@Service
public class MethodService {

    @PreAuthorize("hasRole('admin')")
    public String admin() {
        return "hello admin";
    }

    @Secured("ROLE_user")
    public String user() {
        return "hello user";
    }

    @PreAuthorize("hasAnyRole('admin','user')")
    public String hello() {
        return "hello hello";
    }
}

Controller

@RestController
public class HelloController {

    @Autowired
    MethodService methodService;

    @GetMapping("/hello")
    public String hello() {
        return "hello";
    }

    @GetMapping("/admin/hello")
    public String admin() {
        return "hello admin";
    }

    @GetMapping("/user/hello")
    public String user() {
        return "hello user";
    }

    @GetMapping("/login")
    public String login() {
        return "please login!!!";
    }

    @GetMapping("/hello1")
    public String hello1() {
        return methodService.admin();
    }

    @GetMapping("/hello2")
    public String hello2() {
        return methodService.user();
    }

    @GetMapping("/hello3")
    public String hello3() {
        return methodService.hello();
    }
}

测试hello1,hello2,hello3接口，发现方法已经保护起来了