spring security手动 自定义 用户认证 SecurityContextHolder

1.Spring Security 目前支持认证一体化如下认证技术：

HTTP BASIC authentication headers (一个基于IEFT  RFC 的标准)
HTTP Digest authentication headers (一个基于IEFT  RFC 的标准)
HTTP X.509 client certificate exchange  (一个基于IEFT RFC 的标准)
LDAP (一个非常常见的跨平台认证需要做法，特别是在大环境)
Form-based authentication (提供简单用户接口的需求)
OpenID authentication
Computer Associates Siteminder
JA-SIG Central Authentication Service  (CAS，这是一个流行的开源单点登录系统)
Transparent authentication context  propagation for Remote Method Invocation and HttpInvoker  (一个Spring远程调用协议)

2.但是有时不想使用这些认证,需要自定义用户认证

    2.1 代码如下:

//从spring容器中获取UserDetailsService(这个从数据库根据用户名查询用户信息,及加载权限的service)
UserDetailsService userDetailsService = 
      (UserDetailsService)SpringContextUtil.getBean("userDetailsService");

//根据用户名username加载userDetails
UserDetails userDetails = userDetailsService.loadUserByUsername(username);

//根据userDetails构建新的Authentication,这里使用了
//PreAuthenticatedAuthenticationToken当然可以用其他token,如UsernamePasswordAuthenticationToken               
PreAuthenticatedAuthenticationToken authentication = 
      new PreAuthenticatedAuthenticationToken(userDetails, userDetails.getPassword(),userDetails.getAuthorities());

//设置authentication中details
authentication.setDetails(new WebAuthenticationDetails(request));

//存放authentication到SecurityContextHolder
SecurityContextHolder.getContext().setAuthentication(authentication);
HttpSession session = request.getSession(true);
//在session中存放security context,方便同一个session中控制用户的其他操作
session.setAttribute("SPRING_SECURITY_CONTEXT", SecurityContextHolder.getContext());

2.2 方法userDetailsService.loadUserByUsername(username) 如下:

/**
     * 获取用户Details信息的回调函数.
     */
    public UserDetails loadUserByUsername(String username) throws UsernameNotFoundException,DataAccessException {
        GeOperator geOperator = geOperatorService.findOperatorByPK(username);
        if(geOperator == null){
            throw new UsernameNotFoundException("","用户名错误");
        }
        //加载该用户权限
        Set<GrantedAuthority> grantedAuths = obtainGrantedAuthorities(geOperator);
        boolean enabled = true;
        boolean accountNonExpired = true;
        boolean credentialsNonExpired = true;
        boolean accountNonLocked = true;

        UserDetails userdetails = new MisUser(username, geOperator.getPwd(), 
                geOperator, enabled, accountNonExpired, credentialsNonExpired, accountNonLocked, grantedAuths);
        
        
        return userdetails;
    }

from: https://blog.youkuaiyun.com/lemonzone2010/article/details/26756797