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5 min readTo exclude null properties in JSON using Groovy, you can follow these steps:Start by parsing the JSON string into a Groovy object using the JsonSlurper class. This will allow you to work with the JSON data as a Groovy object. def json = '{"property1": "value1", "property2": null, "property3": "value3"}' def jsonObj = new groovy.json.JsonSlurper().
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6 min readTo convert a JSON to XML using Groovy, you can follow these steps:Import the required libraries: import groovy.json.JsonSlurper import groovy.json.JsonOutput import groovy.xml.XmlUtil Read the JSON string using JsonSlurper: def jsonString = '{"key": "value", "array": [1, 2, 3]}' def json = new JsonSlurper().parseText(jsonString) Convert the JSON object to XML: def xml = XmlUtil.serialize(JsonOutput.
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6 min readTo read a UTF-8 text file in Groovy, you can follow the steps mentioned below:Using the File class from the java.io package, create an instance of the text file you want to read.Use the new BufferedReader(new InputStreamReader(file.newInputStream(), "UTF-8")) to read the file's contents. This ensures that the file is read using the UTF-8 character encoding.Initialize a StringBuilder to store the content of the text file.
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7 min readTo generate an XML out of an XSD in Groovy, you can follow these steps:First, you need to make sure you have the necessary dependencies. Include the following dependencies in your build.gradle file: dependencies { compile 'org.codehaus.groovy:groovy-all:<version>' compile 'javax.xml.bind:jaxb-api:2.2.11' compile 'com.sun.xml.bind:jaxb-impl:2.2.11' } Make sure to replace <version> with the desired version of Groovy.
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5 min readIn Groovy, you can extract substrings from a string using various methods and operators.Using the substring() method: The substring() method is used to extract a substring from a given string based on the start and end positions. Syntax: String substring(int beginIndex, int endIndex) Example: def str = "Hello, World!" def sub = str.
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4 min readThe @Immutable annotation in Groovy is used to create immutable classes, which means objects of these classes cannot be modified after they are initialized. When the @Immutable annotation is applied on a class, Groovy automatically generates a set of getters and constructors, as well as overrides equals(), hashCode(), and toString() methods.
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6 min readTo convert a SQL result set to JSON in Groovy, you can follow these steps:Establish a connection to your database using a library like JDBC.Execute your SQL query and retrieve the result set.Iterate through each row of the result set.Create a Map object for each row where the column names are the keys and the column values are the values.Add each Map object to a List.Convert the List of Map objects to a JSON string using a JSON library like JsonBuilder.Print or return the JSON result.
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3 min readIn Groovy, you can call a constructor using a string name by utilizing the groovy.lang.MetaClass and java.lang.reflect.Constructor classes.Here's an example of how you can achieve this:Get the MetaClass object for the class you want to construct an instance of: def className = "MyClass" def clazz = Class.forName(className) def metaClass = clazz.metaClass Retrieve the constructor by providing the parameter types as arguments to the metaClass.
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4 min readIn Groovy, you can use XPath to get attributes from XML documents. Here is an example of how to do it:First, you need to import the required libraries: import javax.xml.xpath.* import org.xml.sax.InputSource Next, you need to create an XPath object and compile the XPath expression that retrieves the attribute(s) you want: def xpath = XPathFactory.newInstance().newXPath() def expression = xpath.
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5 min readThe if-else statement in Groovy allows you to execute different blocks of code based on a specified condition. It follows a straightforward syntax: if (condition) { // code to execute if the condition is true } else { // code to execute if the condition is false } Here, the condition represents a boolean expression that evaluates to either true or false. If the condition is true, Groovy executes the code block within the first set of curly braces.
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6 min readTo use grafana-cli on a Docker-installed Grafana, you need to follow these steps:Run Grafana as a Docker container. You can do this by executing the following command: docker run -d --name=grafana -p 3000:3000 grafana/grafana Access the Grafana instance by opening a web browser and navigating to http://localhost:3000. This is the default URL and port for Grafana when running as a Docker container. Log in to Grafana using the default username and password.