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public class MyPasswordEncoder implements PasswordEncoder {

	private static String salt="hello world";

	public String encode(String password) {
		String result="";
		String newPW=password+salt;
		try {
			MessageDigest md=MessageDigest.getInstance("MD5");
			BASE64Encoder base64en=new BASE64Encoder();
			result=base64en.encode(md.digest(newPW.getBytes()));
		} catch (NoSuchAlgorithmException e) {
			e.printStackTrace();
		}
		return result;
	}
}

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<bean id="primaryAuthenticationHandler" class="org.jasig.cas.authentication.AcceptUsersAuthenticationHandler">
        <property name="users">
            <map>
                <entry key="casuser" value="Mellon"/>
            </map>
        </property>
</bean>

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<bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource"
		p:driverClass="com.mysql.jdbc.Driver"		 
		p:jdbcUrl="jdbc:mysql://192.168.100.6:3336/cas?useUnicode=true&amp;characterEncoding=UTF-8&amp;zeroDateTimeBehavior=convertToNull"
		p:user="root" 
		p:password="123456" 
		p:initialPoolSize="6" 
		p:minPoolSize="6"
		p:maxPoolSize="18" 
		p:maxIdleTimeExcessConnections="120"
		p:checkoutTimeout="10000" 
		p:acquireIncrement="6"
		p:acquireRetryAttempts="5" 
		p:acquireRetryDelay="2000"
		p:idleConnectionTestPeriod="30" 
		p:preferredTestQuery="select 1" />

<bean id="myPasswordEncoder" class="自定义密码加密类" />  

<bean id="dbAuthHandler" class="org.jasig.cas.adaptors.jdbc.QueryDatabaseAuthenticationHandler"
        p:dataSource-ref="dataSource"
        p:sql="select password from user where username=?"
        p:passwordEncoder-ref=" myPasswordEncoder " />

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<bean id="authenticationManager" class="org.jasig.cas.authentication.PolicyBasedAuthenticationManager">
		<constructor-arg>
			<map>
				<entry key-ref="proxyAuthenticationHandler" value-ref="proxyPrincipalResolver" />
				<entry key-ref="dbAuthHandler" value-ref="primaryPrincipalResolver" />
			</map>
		</constructor-arg>
...
</bean>