基于spring security实现登录注销功能过程解析

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

@Configuration
public class BrowserSecurityConfig extends WebSecurityConfigurerAdapter {

  /**
   * 注入 Security 属性类配置
   */
  @Autowired
  private SecurityProperties securityProperties;

  /**
   * 注入 自定义的 登录成功处理类
   */
  @Autowired
  private MyAuthenticationSuccessHandler mySuccessHandler;
  /**
   * 注入 自定义的 登录失败处理类
   */
  @Autowired
  private MyAuthenticationFailHandler myFailHandler;

  /**
   * 重写PasswordEncoder 接口中的方法，实例化加密策略
   * @return 返回 BCrypt 加密策略
   */
  @Bean
  public PasswordEncoder passwordEncoder(){
    return new BCryptPasswordEncoder();
  }

  @Override
  protected void configure(HttpSecurity http) throws Exception {

    //登录成功的页面地址
    String redirectUrl = securityProperties.getLoginPage();
    //basic 登录方式
//   http.httpBasic()

    //表单登录 方式
    http.formLogin()
        .loginPage("/authentication/require")
        //登录需要经过的url请求
        .loginProcessingUrl("/authentication/form")
        .successHandler(mySuccessHandler)
        .failureHandler(myFailHandler)
        .and()
        //请求授权
        .authorizeRequests()
        //不需要权限认证的url
        .antMatchers("/authentication/*",redirectUrl).permitAll()
        //任何请求
        .anyRequest()
        //需要身份认证
        .authenticated()
        .and()
        //关闭跨站请求防护
        .csrf().disable();
    //默认注销地址：/logout
    http.logout().
        //注销之后 跳转的页面
        logoutSuccessUrl("/authentication/require");
  }

@Component
@Slf4j
public class MyAuthenticationSuccessHandler extends SavedRequestAwareAuthenticationSuccessHandler {
  @Override
  public void onAuthenticationSuccess(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Authentication authentication) throws IOException, ServletException {

     logger.info("登录成功");
     //将 authention 信息打包成json格式返回
      httpServletResponse.setContentType("application/json;charset=UTF-8");
      httpServletResponse.getWriter().write("登录成功");
 } }

@Component
@Slf4j
public class MyAuthenticationFailHandler extends SimpleUrlAuthenticationFailureHandler {
  @Override
  public void onAuthenticationFailure(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, AuthenticationException e) throws IOException, ServletException {
    logger.info("登录失败");

      //设置状态码
      httpServletResponse.setStatus(500);
      //将 登录失败 信息打包成json格式返回
      httpServletResponse.setContentType("application/json;charset=UTF-8");
      httpServletResponse.getWriter().write("登录失败："+e.getMessage());
 } }

@Component
@Slf4j
public class MyUserDetailsService implements UserDetailsService {

  @Autowired
  private PasswordEncoder passwordEncoder;

  /**
   * 根据进行登录
   * @param username
   * @return
   * @throws UsernameNotFoundException
   */
  @Override
  public UserDetails loadUserByUsername(String username) throws UsernameNotFoundException {
    log.info("登录用户名:"+username);
    String password = passwordEncoder.encode("123456");
    //User三个参数  (用户名+密码+权限)
    //根据查找到的用户信息判断用户是否被冻结
    log.info("数据库密码:"+password);
    return new User(username,password, AuthorityUtils.commaSeparatedStringToAuthorityList("admin"));
  }
}

@RestController
@Slf4j
@ResponseStatus(code = HttpStatus.UNAUTHORIZED)
public class BrowerSecurityController {

  /**
   * 把当前的请求缓存到 session 里去
   */
  private RequestCache requestCache = new HttpSessionRequestCache();

  /**
   * 重定向 策略
   */
  private RedirectStrategy redirectStrategy = new DefaultRedirectStrategy();

  /**
   * 注入 Security 属性类配置
   */
  @Autowired
  private SecurityProperties securityProperties;

  /**
   * 当需要身份认证时 跳转到这里
   */
  @RequestMapping("/authentication/require")
  public SimpleResponse requireAuthentication(HttpServletRequest request, HttpServletResponse response) throws IOException {
    //拿到请求对象
    SavedRequest savedRequest = requestCache.getRequest(request, response);
    if (savedRequest != null){
      //获取 跳转url
      String targetUrl = savedRequest.getRedirectUrl();
      log.info("引发跳转的请求是:"+targetUrl);

      //判断 targetUrl 是不是 .html　结尾, 如果是：跳转到登录页(返回view)
      if (StringUtils.endsWithIgnoreCase(targetUrl,".html")){
        String redirectUrl = securityProperties.getLoginPage();
        redirectStrategy.sendRedirect(request,response,redirectUrl);
      }
    }
    //如果不是，返回一个json 字符串
    return new SimpleResponse("访问的服务需要身份认证，请引导用户到登录页");
  }