replace string in a file in groovy example

replaceInFile.groovy

/* Groovy Usage: 
     The following example replaces:
      the 1st occurrence of "James" in data.txt with "user1", 
      the 2nd occurrence of "James" in data.txt with "user2", 
      the 3rd occurrence of "James" in data.txt with "user3", 
      ..
      the 9th occurrence of "James" in data.txt with "user9".
*/

def myFile = new File("data.txt") 
def fileText = myFile.text
for ( index in 1..9 ) {
	fileText = (fileText =~ /James/).replaceFirst("user${index}")
}
myFile.write(fileText)

/* Usage in Cloudify:
     The following code snippet replaces all the occurrences of 8080 
     with the current actual http port and all the occurrences of 8009 
     with the current actual AJP port.
*/ 

def config = new ConfigSlurper().parse(new File("tomcat-service.properties").toURL())
def context = ServiceContextFactory.getServiceContext()
def home = "${context.serviceDirectory}/${config.name}"
portIncrement = 0 
def serverXmlFile = new File("${home}/conf/server.xml") 
def serverXmlText = serverXmlFile.text	
portReplacementStr = "port=\"${config.port + portIncrement}\""
ajpPortReplacementStr = "port=\"${config.ajpPort + portIncrement}\""
serverXmlText = serverXmlText.replace("port=\"8080\"", portReplacementStr) 
serverXmlText = serverXmlText.replace("port=\"8009\"", ajpPortReplacementStr) 
serverXmlFile.write(serverXmlText)