groovy and grails

Groovy supports two types of strings: A generic Java string, an instance of java.lang.String, and Gstrings, which is an instance of groovy.lang.GString, and allows the text to contain placeholders. Gstrings is not a subclass of string because the string class is the final class (final Class) that cannot be inherited. However, Gstring is the same as a generic string, because groovy can transform gstrings int

Scott Davis will continue the discussion of Groovy metaprogramming, and this time he will delve into @Delegate annotations, @Delegate annotations blur the distinction between data types and behavior and static and dynamic types. In the past few sessions of groovy, you've learned how groovy language features such as closures and metaprogramming add dynamic functi

This will be a series of text that expands our approach to the use of custom range classes. Perhaps we unknowingly use the range class in the groovy language, not even aware of it, or we often marvel at the convenience of using the range class in the coding process of the groovy language, but just marvel that we're not paying for it. Or we want to use the custom range class in the actual encoding, but we ca

Hudson management software, management address, and anonymous access: http: // 220.181.26.142: 8080/seems to be mainly used for the cvs service:This management software is not familiar with it. Find a place where Groovy commands can be executed (check Groovy, similar to java code): Execute Groovy code and read the local/etc/passwd file on the server: try {text =

Reference file: // poi-3.10-final/docs/spreadsheet/quick-guide.html # textextraction The code for excel2txt. Groovy is as follows: import java.io.File;import org.apache.poi.hssf.usermodel.HSSFCell;import org.apache.poi.hssf.usermodel.HSSFRow;import org.apache.poi.hssf.usermodel.HSSFSheet;import org.apache.poi.hssf.usermodel.HSSFWorkbook;import org.apache.poi.hssf.extractor.ExcelExtractor;import org.apache.poi.poifs.filesystem.POIFSFileSystem;import o

1.maven Introducing Groovy Jar Pack2. CallImport Groovy.lang.GroovyShell;public class Testgroovy {public static void Main (string[] args) {TODO auto-generated Method StubGroovyshell Groovyshell = new Groovyshell ();Object Resultobj;int x = 1;Groovyshell.setvariable ("X", 3);//Register variable ValueResultobj = groovyshell.evaluate ("Import com.xd.helper.*; Helper.sys (' +x);x>1;xSystem.out.println (Resultobj);SYSTEM.OUT.PRINTLN (x);//

Assertions are used to verify that a hypothetical condition is true, and in groovy's assertion, if the hypothetical condition is not true, a Java.lang.AssertionError exception is thrown. Use the groovy expression to test the hypothetical condition.Such asassert 1==2: "One isn ' t"Will throw an exception:Exception thrownjava.lang.AssertionError:One isn' t. Expression: (1 = = 2) at Consolescript19.run (ConsoleScript19:1)The Java assertion is also wri

Introduction: Online social networking is now very popular. In this article you'll learn how to mix Google maps, Twitter, Groovy, and Ajax to build social networks. By combining Google maps with location information that Twitter exposes, you can create a mashup (mashups) application that allows people to view Twitter in a specific location. The simple application built in this article allows users to view a map of their friends on Twitter-a network ge

The definition of an array and the initial value of an assignment In the groovy language, arrays are defined in the same way as in the Java language. def a = new String[4] 　　 　　def nums = newint[10] 　　 def objs = new Object[3] And then the assignment is the same: a[0] = 'a' 　　a[1] = 'b' 　　a[2] = 'c' a[3] = 'd' The difference is in assigning an initial value when the array is defined. In the Java language, this is defined as an array of strings:

In a dynamic language such as groovy, closures are one of the key weapons. And the developers of these languages are naturally not going to give up using these weapons, and we can see that the closures are widely used in the groovy language collection classes. Among them, each method is such a method of using closures. We know that in Java, we use the following statement to traverse the collection class ob

In the previous series, "Groovy Tip" as "keyword usage", we've talked about some of the exciting uses of the "as" keyword. This article goes on to continue to show some of the more exciting uses of the "as" keyword in the previous section. In the previous article, we talked about the use of the "as" keyword as a type conversion. The most common uses are the following: def list = ['a','b','c'] println list.class def strs = list as String[] println st

We have long used the groovy language hook, the "InvokeMethod" method and several other methods. We implement the "InvokeMethod" method in a class that assigns all or part of the methods of the class instance that are invoked during the run time. These are discussed in detail in the mop InvokeMethod and methodmissing methods of groovy exploration. Now, we have been in deep contact with the metaclass of the

Ofbiz-groovy-freemarker into different pages depending on the browser's addressStep One: (2 Select) Create a groovy file, or a Java file. Define variables in the file to be placed in theRequest.setattribute easy to find in the Jump page, you can do some validation in this class or the method of adding and deletions, you can customize the return value.Step two: In the Controller.xml file, define the address