Error information:

ATTENTION!  Your password for authentication realm:

   <http://192.168.2.49:81> VisualSVN Server

can only be stored to disk unencrypted!  You are advised to configure
your system so that Subversion can store passwords encrypted, if
possible.  See the documentation for details.

You can avoid future appearances of this warning by setting the value
of the 'store-plaintext-passwords' option to either 'yes' or 'no' in
'/var/lib/jenkins/.subversion/servers'.
-----------------------------------------------------------------------
Store password unencrypted (yes/no)?svn: E070014: Unable to connect to a repository at URL 'http://192.168.2.49:81/svn/JgwPlatform/platform-codecenter/platform-common-code'
svn: E070014: Can't read stdin: End of file found
Build step 'Execute shell' marked build as failure

Solution:
　　svn parameter: --no-auth-cache : do not cache authentication tokens
When executing the command: /usr/bin/svn update --username slq --password 112233 --no-auth-cache