ANT script. Replacing dynamic values from one file with values from another

Question

I need some help with replacing dynamic values. I am new to ant scripting and require some assistance.

I currently have one file on a server which will hold the properties that are specific for that server. i.e database connection details

ydkprefs.dbClassName=com.ibm.db2.jcc.DB2Driver
ydkprefs.dbType=DB2
ydkprefs.dbURL=jdbc:db2://localhost:50000/application
ydkprefs.dbschema=SCHEMA
ydkprefs.dbUsername=db2inst1

and then I have a template xml file with dynamic properties i.e.

 <Database Name=${dbName} className="${dbClassName}"
                dbType="${dbType}" folder=""
                jdbcURL="${dbURL}"
                schema="${dbschema}" user="${dbUsername}"/>

I have looked through a number of sites and I am none the wiser. The most promising information. The only thing that I have found that can work is to replace individual values which are stated within the ant script itself.

Ian Roberts · Accepted Answer · 2013-05-23 10:39:16Z

1

If you could change the property file and/or the template to make it so that the property names in the property file exactly match the placeholders you want to replace in the target file, then you could do it with

<copy file="template.xml" tofile="target.xml" encoding="UTF-8">
  <filterset begintoken="$${" endtoken="}" filtersfile="db.properties" />
</copy>

In order to produce well formed XML output you would also need to ensure that the property values are properly XML escaped where necessary, e.g. if you need to use an & character in a value then it needs to be & in the properties file.

answered May 23, 2013 at 10:39

Ian Roberts

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1 Comment

Explicitsoul Over a year ago

I tip my hat to you sir. Thank you very much.

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