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<title>Login Example</title><body bgcolor=white><h3>You are: <%java.security.Principal user = request.getUserPrincipal();if (user != null) out.println(user);else out.println("nobody important");%></h3>This example illustrates using the form-based servlet 2.2 securityconfiguration.Security is configured by<a href='../view_source.jsp?login/WEB-INF/web.xml'>web.xml</a>.<p>The site has control over the authentication database. You can createyour own custom<a href='../view_source.jsp?login/WEB-INF/classes/test/TestAuthenticator.java'>authenticator class</a>.<p>If you try to access a <a href='<%= response.encodeURL("protected.jsp?a=b") %>'>protected page</a>, youshould be presented with a login form. If you succeed in the login, you'llbe able to see the page.<p>Sites that use login to provide personalization can use optional login.Fill in the following form to see this page with your name:<form action='j_security_check' method='POST'><table><tr><td>User: <td><input name='j_username'><br><tr><td>Password (quidditch): <td><input name='j_password' type='password'><br><tr><td><input type=submit><td></table><!-- When the user logs in, direct him back to this page. --><input name='j_uri' type='hidden' value='index.jsp'></form></body>⌨️ 快捷键说明
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