Storage Mechanisms
每个受支持的用于读取用户名和密码的机制都可以使用任何受支持的存储机制：
Each of the supported mechanisms for reading a username and password can use any of the supported storage mechanisms:
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Simple Storage with In-Memory Authentication
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Relational Databases with JDBC Authentication
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Custom data stores with UserDetailsService
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LDAP storage with LDAP Authentication