liferay的文档库的portlet用起来很方便，但是发现，当你把这个tomcat重新部署，或者把这个tomcat移植到其他机器上的时候，文档库里面以前上传上来的文档，虽然信息还在，但是无法下载了。
原因是，liferay文档库，默认的配置是把文档的数据存储到了你tomcat所在服务器的${user.home}/liferay下面的jackrabbit文件夹里面了，所以在重新部署tomcat 或者将tomcat移植到其他服务器上的时候，不能下载了。
解决办法：
1。在portal.properties里面将resource.repositories.root=${user.home}/liferay的${user.home}修改成你的tomcat路径下。不要将这些信息存储到你的用户文件夹下。
2。将文档的存储方式改变成以数据的形式存储到数据库中，我觉得这个方法更好一些。这个到${user.home}/liferay/jackrabbit下，修改repository.xml。
修改后的文件如下：
<?xml version="1.0"?>
<Repository>
<!--<FileSystem class="org.apache.jackrabbit.core.fs.local.LocalFileSystem"> <param name="path" value="${rep.home}/repository" /> </FileSystem>--><!--
Database File System (Cluster Configuration)This is sample configuration for mysql persistence that can be used for
clustering Jackrabbit. For other databases, change the connection, credentials, and schema settings. --><FileSystem class="org.apache.jackrabbit.core.fs.db.DbFileSystem">
<param name="driver" value="com.mysql.jdbc.Driver"/> <param name="url" value="jdbc:mysql://localhost/jcr" /> <param name="user" value="root" /> <param name="password" value="admin" /> <param name="schema" value="mysql"/> <param name="schemaObjectPrefix" value="J_R_FS_"/> </FileSystem><Security appName="Jackrabbit">
<AccessManager class="org.apache.jackrabbit.core.security.SimpleAccessManager" /> <LoginModule class="org.apache.jackrabbit.core.security.SimpleLoginModule"> <param name="anonymousId" value="anonymous" /> </LoginModule> </Security> <Workspaces rootPath="${rep.home}/workspaces" defaultWorkspace="liferay" /> <Workspace name="${wsp.name}"> <!-- <FileSystem class="org.apache.jackrabbit.core.fs.local.LocalFileSystem"> <param name="path" value="${wsp.home}" /> </FileSystem> <PersistenceManager class="org.apache.jackrabbit.core.state.xml.XMLPersistenceManager" /> --> <!-- Database File System and Persistence (Cluster Configuration)This is sample configuration for mysql persistence that can be used for
clustering Jackrabbit. For other databases, change the connection, credentials, and schema settings. --><PersistenceManager class="org.apache.jackrabbit.core.state.db.SimpleDbPersistenceManager">
<param name="driver" value="com.mysql.jdbc.Driver" /> <param name="url" value="jdbc:mysql://localhost/jcr" /> <param name="user" value="root" /> <param name="password" value="admin" /> <param name="schema" value="mysql" /> <param name="schemaObjectPrefix" value="J_PM_${wsp.name}_" /> <param name="externalBLOBs" value="false" /> </PersistenceManager> <FileSystem class="org.apache.jackrabbit.core.fs.db.DbFileSystem"> <param name="driver" value="com.mysql.jdbc.Driver"/> <param name="url" value="jdbc:mysql://localhost/jcr" /> <param name="user" value="root" /> <param name="password" value="admin" /> <param name="schema" value="mysql"/> <param name="schemaObjectPrefix" value="J_FS_${wsp.name}_"/> </FileSystem> </Workspace> <Versioning rootPath="${rep.home}/version"> <!-- <FileSystem class="org.apache.jackrabbit.core.fs.local.LocalFileSystem"> <param name="path" value="${rep.home}/version" /> </FileSystem><PersistenceManager class="org.apache.jackrabbit.core.state.xml.XMLPersistenceManager" />
--> <!-- Database File System and Persistence (Cluster Configuration)This is sample configuration for mysql persistence that can be used for
clustering Jackrabbit. For other databases, change the connection, credentials, and schema settings. --><FileSystem class="org.apache.jackrabbit.core.fs.db.DbFileSystem">
<param name="driver" value="com.mysql.jdbc.Driver"/> <param name="url" value="jdbc:mysql://localhost/jcr" /> <param name="user" value="root" /> <param name="password" value="admin" /> <param name="schema" value="mysql"/> <param name="schemaObjectPrefix" value="J_V_FS_"/> </FileSystem> <PersistenceManager class="org.apache.jackrabbit.core.state.db.SimpleDbPersistenceManager"> <param name="driver" value="com.mysql.jdbc.Driver" /> <param name="url" value="jdbc:mysql://localhost/jcr" /> <param name="user" value="root" /> <param name="password" value="admin" /> <param name="schema" value="mysql" /> <param name="schemaObjectPrefix" value="J_V_PM_" /> <param name="externalBLOBs" value="false" /> </PersistenceManager> </Versioning><!--
Cluster ConfigurationThis is sample configuration for mysql persistence that can be used for
clustering Jackrabbit. For other databases, change the connection, credentials, and schema settings. --><!--<Cluster id="node_1" syncDelay="5">
<Journal class="org.apache.jackrabbit.core.journal.DatabaseJournal"> <param name="revision" value="${rep.home}/revision"/> <param name="driver" value="com.mysql.jdbc.Driver"/> <param name="url" value="jdbc:mysql://localhost/jcr"/> <param name="user" value=""/> <param name="password" value=""/> <param name="schema" value="mysql"/> <param name="schemaObjectPrefix" value="J_C_"/> </Journal> </Cluster>--> </Repository>注意：连接数据库时候的用户名和密码填写正确，还有数据库名，如果不想和tomcat用同一个数据库，那么就再另外建立一个jcr的数据库即可，里面的表会自动生成。
这样，不管tomcat怎么重新部署和移植，文档的数据是存储到数据库里面了，只要数据库文件还在，什么时候都能下载。
参考文档：http://wiki.liferay.com/index.php/Jackrabbit
补充：
刚才一个网友告诉我可以在部署出来之前修改portal源码的相关配置，这样第一次部署tomcat生成的repository.xml就是存储到数据库的配置了。修改的源码是portal-impl.jar\com\liferay\portal\jcr\jackrabbit\dependencies\repository.xml 这个就是部署repository.xml之前的原文件。
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