Posts (page 210)
-
4 min readTo run Maven commands using a Groovy script, you can use the ProcessBuilder class to execute external commands. You need to create a new ProcessBuilder instance and set the command to be executed (in this case, the Maven command).Here is an example of how you can run a Maven command using Groovy script: def command = "mvn clean install" def processBuilder = new ProcessBuilder(command.split(" ")) processBuilder.
-
7 min readTo find an XML tag using Groovy, you can use the XmlSlurper class provided by Groovy. You can create an instance of XmlSlurper and then use methods like find, findAll, or depthFirst to search for specific XML tags based on their name or attributes. You can also use the GPath expressions to navigate through the XML structure and locate the desired tag. By using these methods, you can easily find and extract information from XML documents in Groovy.
-
4 min readTo pass multiple string parameters to a function in Groovy, you can simply list the parameters separated by commas within the parentheses when defining the function.
-
5 min readWhen cleaning up the output of a groovy script, you can start by using print statements to check the values and variables being outputted. This will help you identify any unnecessary or unwanted information in the output.You can also use formatting techniques such as using the println() function to display output on a new line or using string interpolation to concatenate variables with specific text or formatting.
-
4 min readTo lock and unlock a Jenkins slave with Groovy, you can utilize the Jenkins API to interact with the slave node. First, you need to obtain the node object representing the slave using Jenkins.instance.getNode("node-name") method. Once you have the node object, you can use the setTemporarilyOffline(boolean) method to lock the node by setting the parameter to true. Similarly, you can unlock the node by setting the parameter to false.
-
5 min readIn Groovy, you can get the day from a date by using the calender class. You can create a calender instance and set it to the date you want to extract the day from. Then, you can call the get method on the calender instance with the calender constant corresponding to the day of the week (e.g. calender.DAY_OF_WEEK) to get the day as an integer. Keep in mind that the week starts from Sunday with 1 as the value and ends in Saturday with 7.
-
3 min readIn Groovy, nested expressions work in a similar way to other programming languages. When you have an expression within another expression, the inner expression is evaluated first before the outer expression. This allows you to create more complex and dynamic code by combining multiple expressions within one another.For example, you can nest if statements within while loops, or mathematical calculations within if statements.
-
4 min readTo fetch a URL from a string in Groovy, you can use regular expressions to search for patterns that resemble a URL. You can use the find() method along with a regular expression pattern to extract the URL from the string. Here is an example of how you can do this: def urlString = "This is a sample text with a URL http://www.example.com included in it." def pattern = /(http|https):\/\/[^\s]+/ def matcher = (urlString =~ pattern) if (matcher.find()) { def url = matcher.
-
2 min readTo call an npm external command from Groovy, you can use the ProcessBuilder class in Java, which Groovy can utilize. You can create a new ProcessBuilder object and pass the npm command as a list of strings. Then, you can execute the command using the start() method of the ProcessBuilder object.
-
3 min readTo order a JSON output using Groovy, you can use the JsonOutput class which provides methods to customize the output of JSON data. You can use the JsonOutput.toJson() method to convert a Groovy object into a JSON string format. To order the output, you can sort the properties of the object before converting it to JSON. You can use the sort() method to sort the properties based on a specific criteria and then use JsonOutput.toJson() to convert it into a JSON string with the desired ordering.
-
3 min readTo read an XML file correctly in Groovy, you can use the XMLSlurper class provided by Groovy. This class allows you to parse and navigate through an XML file easily. You can create an instance of XMLSlurper and then use its methods to extract data from the XML file. Make sure to handle any exceptions that may occur during the parsing process. Additionally, you can use XPath expressions to access specific elements and attributes within the XML file.
-
5 min readTo create multiple instances from a template map in Groovy, you can start by defining a template map with the desired key-value pairs. Then, you can iterate over a list or range of values to create multiple instances based on the template map. Within the iteration, you can customize each instance by setting specific values for specific keys. This way, you can quickly generate multiple instances from a predefined template map without duplicating code.