UsernamePasswordAuthenticationToken的用法

UsernamePasswordAuthenticationToken是Spring Security中用于封装用户名密码认证信息的类。它实现了Authentication接口，用于表示一个认证请求。它的构造方法接受两个参数，分别是principal和credentials，用于传递用户名和密码信息。这个方法可以帮助我们处理用户登录认证的过程。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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