NetBeans Tomcat Jsp mysql表单登录和会话

在context.xml中

<?xml version="1.0" encoding="UTF-8"?><Context antiJARLocking="true" path="/myDBname" allowCasualMultipartParsing="true" >    <Realm className="org.apache.catalina.realm.CombinedRealm" >        <Realm className="org.apache.catalina.realm.JDBCRealm" driverName="com.mysql.jdbc.Driver"    name="myDBname" type="javax.sql.DataSource"    connectionURL="jdbc:mysql://localhost:3306/mydbname"     connectionName="root" connectionPassword="sasa"     userTable="administrators" userNameCol="Email" userCredCol="Password"    userRoleTable="administrators" roleNameCol="LoginRole"    auth="Container" maxTotal="100" maxIdle="30" maxWaitMillis="10000" digest="MD5"/>        <Realm className="org.apache.catalina.realm.JDBCRealm" driverName="com.mysql.jdbc.Driver"    name="myDBname" type="javax.sql.DataSource"    connectionURL="jdbc:mysql://localhost:3306/mydbname"     connectionName="root" connectionPassword="sasa"     userTable="users" userNameCol="Email" userCredCol="Password"    userRoleTable="users" roleNameCol="LoginRole"    auth="Container" maxTotal="100" maxIdle="30" maxWaitMillis="10000" digest="MD5"/>    </Realm>    </Context>

web.xml

<resource-ref>    <description>DB Connection</description>    <res-ref-name>myDBname</res-ref-name>    <res-type>javax.sql.DataSource</res-type>    <res-auth>Container</res-auth></resource-ref><login-config>    <auth-method>FORM</auth-method>    <realm-name>myDBname</realm-name>    <form-login-config>        <form-login-page>/pages/Login.jsp</form-login-page>        <form-error-page>/pages/Error.jsp</form-error-page>    </form-login-config></login-config><security-role>    <description>Administrator</description>    <role-name>admin</role-name></security-role><security-constraint>    <web-resource-collection>       <web-resource-name>myDBname</web-resource-name>       <url-pattern>/pages/admin/*</url-pattern>       <http-method>POST</http-method>       <http-method>GET</http-method>       <http-method>PUT</http-method>    </web-resource-collection>    <auth-constraint>       <role-name>admin</role-name>    </auth-constraint></security-constraint><welcome-file-list>    <welcome-file>pages/home.jsp</welcome-file></welcome-file-list>

将mysql-connector-java-5.1.23-bin.jar复制到C： Program Files Apache Software
Foundation Apache Tomcat 8.0.15 lib

我还使用

<%= request.getContextPath() %>

<link href="<%= request.getContextPath() %>/resources/styles/main.css" rel="stylesheet" type="text/css"/>

Java代码要使用MD5哈希存储密码，请执行以下操作：

String passwordHash = org.apache.catalina.realm.Realmbase.Digest(password, "md5", "utf-8");

并将passwordHash写入数据库…