参考文章http://www.ibm.com/developerworks/cn/opensource/os-cn-liferay-cas/index.html

发现使用该方法最后出现了空指针异常，修改了liferay部分源码实现了Digester，特此记录，给后来人方便。

在此我们采用和 Liferay 一致的默认加密算法“SHA”，在调用 Liferay 提供的加密算法时， 我们需要将 Liferay 的几个 jar 包引入到我们的 cas 工程中，自定义的加密算法也很简单， 只需要调用 jar 包中的加密工具类提供的加密算法即可，同时自定义的类需要继承 PasswordEncoder 接口：

使用maven管理的话，代码如下

<dependency><groupId>com.liferay.portal</groupId><artifactId>portal-service</artifactId><version>6.2.1</version>
</dependency>

其中CAS的加密配置中修改如下

<bean id="dbAuthHandler" class="org.jasig.cas.adaptors.jdbc.QueryDatabaseAuthenticationHandler" p:dataSource-ref="dataSource"p:passwordEncoder-ref="myPasswordEncoder"p:sql="SELECT password_ FROM User_ WHERE screenName=?" /><bean id="dataSource"class="org.springframework.jdbc.datasource.DriverManagerDataSource"p:driverClassName="com.mysql.jdbc.Driver"p:url="jdbc:mysql://127.0.0.1:3306/portal?useUnicode=true&amp;characterEncoding=utf-8"p:username="root"p:password="" /><bean id="myPasswordEncoder" class="passwordEncoder.MyPasswordEncoder"><constructor-arg value="SHA"/></bean><bean id="digesterUtil" class="com.liferay.portal.kernel.util.DigesterUtil"><property name="digester" ref="digester"></property></bean><bean id="digester" class="passwordEncoder.DigesterImpl"></bean>

DigesterImpl是Digester的实现。

import com.liferay.portal.kernel.log.Log;
import com.liferay.portal.kernel.log.LogFactoryUtil;
import com.liferay.portal.kernel.security.pacl.DoPrivileged;
import com.liferay.portal.kernel.util.Base64;
import com.liferay.portal.kernel.util.Digester;
import com.liferay.portal.kernel.util.StreamUtil;
import com.liferay.portal.kernel.util.StringBundler;
import com.liferay.portal.kernel.util.StringPool;import java.io.IOException;
import java.io.InputStream;
import java.io.UnsupportedEncodingException;
import java.nio.ByteBuffer;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;import org.apache.commons.codec.binary.Hex;/*** @author Brian Wing Shun Chan* @author Alexander Chow* @author Connor McKay*/
@DoPrivileged
public class DigesterImpl implements Digester {@Overridepublic String digest(ByteBuffer byteBuffer) {return digest(Digester.DEFAULT_ALGORITHM, byteBuffer);}@Overridepublic String digest(InputStream inputStream) {return digest(Digester.DEFAULT_ALGORITHM, inputStream);}@Overridepublic String digest(String text) {return digest(Digester.DEFAULT_ALGORITHM, text);}@Overridepublic String digest(String algorithm, ByteBuffer byteBuffer) {if (_BASE_64) {return digestBase64(algorithm, byteBuffer);}else {return digestHex(algorithm, byteBuffer);}}@Overridepublic String digest(String algorithm, InputStream inputStream) {if (_BASE_64) {return digestBase64(algorithm, inputStream);}else {return digestHex(algorithm, inputStream);}}@Overridepublic String digest(String algorithm, String... text) {if (_BASE_64) {return digestBase64(algorithm, text);}else {return digestHex(algorithm, text);}}@Overridepublic String digestBase64(ByteBuffer byteBuffer) {return digestBase64(Digester.DEFAULT_ALGORITHM, byteBuffer);}@Overridepublic String digestBase64(InputStream inputStream) {return digestBase64(Digester.DEFAULT_ALGORITHM, inputStream);}@Overridepublic String digestBase64(String text) {return digestBase64(Digester.DEFAULT_ALGORITHM, text);}@Overridepublic String digestBase64(String algorithm, ByteBuffer byteBuffer) {byte[] bytes = digestRaw(algorithm, byteBuffer);return Base64.encode(bytes);}@Overridepublic String digestBase64(String algorithm, InputStream inputStream) {byte[] bytes = digestRaw(algorithm, inputStream);return Base64.encode(bytes);}@Overridepublic String digestBase64(String algorithm, String... text) {byte[] bytes = digestRaw(algorithm, text);return Base64.encode(bytes);}@Overridepublic String digestHex(ByteBuffer byteBuffer) {return digestHex(Digester.DEFAULT_ALGORITHM, byteBuffer);}@Overridepublic String digestHex(InputStream inputStream) {return digestHex(Digester.DEFAULT_ALGORITHM, inputStream);}@Overridepublic String digestHex(String text) {return digestHex(Digester.DEFAULT_ALGORITHM, text);}@Overridepublic String digestHex(String algorithm, ByteBuffer byteBuffer) {byte[] bytes = digestRaw(algorithm, byteBuffer);return Hex.encodeHexString(bytes);}@Overridepublic String digestHex(String algorithm, InputStream inputStream) {byte[] bytes = digestRaw(algorithm, inputStream);return Hex.encodeHexString(bytes);}@Overridepublic String digestHex(String algorithm, String... text) {byte[] bytes = digestRaw(algorithm, text);return Hex.encodeHexString(bytes);}@Overridepublic byte[] digestRaw(ByteBuffer byteBuffer) {return digestRaw(Digester.DEFAULT_ALGORITHM, byteBuffer);}@Overridepublic byte[] digestRaw(String text) {return digestRaw(Digester.DEFAULT_ALGORITHM, text);}@Overridepublic byte[] digestRaw(String algorithm, ByteBuffer byteBuffer) {MessageDigest messageDigest = null;try {messageDigest = MessageDigest.getInstance(algorithm);messageDigest.update(byteBuffer);}catch (NoSuchAlgorithmException nsae) {_log.error(nsae, nsae);}return messageDigest.digest();}@Overridepublic byte[] digestRaw(String algorithm, InputStream inputStream) {MessageDigest messageDigest = null;try {messageDigest = MessageDigest.getInstance(algorithm);byte[] buffer = new byte[StreamUtil.BUFFER_SIZE];int read = 0;while ((read = inputStream.read(buffer)) != -1) {if (read > 0) {messageDigest.update(buffer, 0, read);}}}catch (IOException ioe) {_log.error(ioe, ioe);}catch (NoSuchAlgorithmException nsae) {_log.error(nsae, nsae);}finally {StreamUtil.cleanUp(inputStream);}return messageDigest.digest();}@Overridepublic byte[] digestRaw(String algorithm, String... text) {MessageDigest messageDigest = null;try {messageDigest = MessageDigest.getInstance(algorithm);StringBundler sb = new StringBundler(text.length * 2 - 1);for (String t : text) {if (sb.length() > 0) {sb.append(StringPool.COLON);}sb.append(t);}String s = sb.toString();messageDigest.update(s.getBytes(Digester.ENCODING));}catch (NoSuchAlgorithmException nsae) {_log.error(nsae, nsae);}catch (UnsupportedEncodingException uee) {_log.error(uee, uee);}return messageDigest.digest();}private static final boolean _BASE_64 = true;private static Log _log = LogFactoryUtil.getLog(DigesterImpl.class);}

最后一点，Liferay6.2.1最新版中，默认的加密方法不是SHA加密，需要配置文件

passwords.encryption.algorithm=SHA

Liferay中Portal.properties文件保存着Liferay很多的平台级的配置参数，通过在这里调整一些参数的配置信息，可以满足许多不同的需求。一般我们定义Portal.properties里面的配置文件是不直接修改的，按配置liferay可以加载以下路径下面的配置参数来覆盖默认的

• include-and-override=portal-bundle.properties
• include-and-override=${liferay.home}/portal-bundle.properties
• include-and-override=portal-ext.properties
• include-and-override=${liferay.home}/portal-ext.properties
• include-and-override=portal-setup-wizard.properties
• include-and-override=${liferay.home}/portal-setup-wizard.properties
• include-and-override=portal-${easyconf:companyId}.properties
• include-and-override=${liferay.home}/portal-${easyconf:companyId}.properties
• include-and-override=${external-properties}
• include-and-override=${liferay.home}/${external-properties}

也就是这些配置参数在上面的任一文件里面修改都可以。我们一般将自定义的配置参数放在下面的两个配置文件里面。

portal-setup-wizard.properties（在Liferay第一次运行的时候生成，默认是在liferay-portal-6.1.1-ce-ga2目录下面）

portal-ext.properties（在tomcat/webapps/ROOT/WEB-INF/classess下面，不存在可以自己创建）