groovy and grails

A typical grails application throws events at key points in the application lifecycle, whether during the build process or when creating a single component, such as a domain class or controller. We can use these application events as extension points to create listeners to intercept them and respond to them using custom behavior. In addition to the traditional Web application lifecycle of HTTP requests and responses,

Grails Domain has the function of automatic verification, but when I define the attribute of Domain, I define a field of the int type, and then use String when entering the field on the page, then he starts the automatic verification function and reports the following verification information. Failed to convert property value of type [java. lang. String] to required type [int] for propertyAge; nested exception is java. lang. IllegalArgumentException:

Groovy classes are compiled into bytecode of Java, that is, there is a one-to-one ing between groovy classes and Java classes. Every groovy class can be stored in JavaCodeBecause the groovy class is also a Java class. Usage of groovy list: Def list = [1, 2, 'Hello', n

Introduction: Groovy's concise syntax frees developers from the typical Java™ architecture that requires code compilation but does not help express what the program really wants to achieve. In this revival of the Groovy series, groovy developer and special columnist J. Scott Hickey takes you through a series of comparisons between regular Java code and Groovy Cod

Use GVM to build the Groovy development environment and third-party jar package path Configuration Recently I need to write a small program in Groovy, so I will download a policyat http://policy.codehaus.org. In this process, we found a good tool, GVM (the Groovy enVironment Manager), which is quite useful. the following is a brief introduction. GVM is a tool for

This article is used to describe some of the groovy-style code in the handling of strings, and the groovy-style code here is mostly different from the coding style of the Java language. First, we're going to define a string object to use as our example: def str = "hello" Now, what we're going to say is the style of the substring. In the Java language, to remove a substring labeled 1 and 2, you must use

There are four ways to annotate groovy, and here's a more detailed look: 1.1 Single-line comment In groovy, single-line comments start with//and can start anywhere in a row, with the following characters being the annotations section. For example: A standalone single line commentprintln "Hello World"//A comment till the end of ofthe line 1.2 Multi-line comments A multiline comment starts with/* and ends w

, you must add a custom command name to the HTMl element. Use the hump method to name an instruction runoobDirective, but use it to separate it with-, runoob-directive: AngularJS can also define filters as follows: AngularJS has its own HTML event processing method: In addition, AngularJS's preferred style sheet is Twitter Bootstrap, and Twitter Bootstrap is currently the most popular front-end framework. The above code is to see the http://www.runoob.com/angularjs/, more information can ref

Spring Security Core Plugin is a powerful privilege control plug-in for spring, Secure your applications using the powerful Spring security library quickly and easily Official plugin Address: Http://www.grails.org/plugin/spring-security-core Official Use manual: http://grails-plugins.github.com/grails-spring-security-core/docs/manual/ Insert the spring security Core Plugin in the

Spring Security Core Plugin is a powerful access control plug-in for spring, Secure your applications using the powerful Spring security library quickly and easily Official plugin Address: Http://www.grails.org/plugin/spring-security-core Official User's Manual: http://grails-plugins.github.com/grails-spring-security-core/docs/manual/ Insert Spring Security Core Plugin in your

Bank.log = Logbank B1 = new Bank () B1.name = "BOA" b1.minbalance = 100b1.city= "London" Bank b2 = new Bank () B2.name = "HSBC" B2 . minbalance = 100b2.city= "LA" Bank B3 = new Bank ("A", "X") log.info b3.namebank b4 = new Bank ("B", "Max", "X1") Bank B5 = new Bank ("C", 1300, "X2") log.info b5.minbalanceclass bank{def static logdef namedef minbalancedef Citypublic Bank () { // No return type, same name with class Namelog.info "inside Constructor"}//public Bank (bankname,bankminbal,bankcit

Groovy tip 10 simplified string operations in groovyIn groovy, operations on string objects are as convenient as operations on List objects. For example, in Java, the substring method is used for operations on string objects. As follows: String STR = "abcdefg"; system. Out. Println (Str. substring (); the result is: BC has two inconveniences: first, the complexity of the substring method and parameters; sec

I once had doubts about projects such as xruby jruby. Why does it take time to associate JVM with Ruby? The answer is fast and reusable. I am more interested in the scripting language. Ruby is my favorite scripting language, followed by JavaScript. I have heard of the groovy scripting language a long time ago, but I have never touched on it. This may be related to my C and C ++ origins. Sometimes, I reject Java and do not care much about Java. (Of co

Log.info "Starting"//We use class to create objects of a classplanet p1 = new Planet () Planet p2 = new Planet () Planet P3 = new Planet ()//planet.name = "Pluto" illegal planet.shape = "circle" p1.name = "earth"//p1.shape = "Circle" P2.name = "Jupiter"//p2.shape = "circle" P3.name = "mars"//p3.shape = "Circle" log.info p1.name+ " +p1.shapelog.info p2.name+ " " +p2.shapelog.info p3.name+ " " +P3.SHAPEP1 = P2log.info "*************************************" Log.info P1.name+ " " +p1.shapelo

def x = new String[3]x[0] = "A" x[1] = "B" x[2] = "C" Log.info "XXXXXX 1" try{x[3] = "D"//def Z=9/0}catch (Exception e) {Log.info "Some Error" +e.getmessage () //Use E.getmessage () to print exception Information//e.printstacktrace () //This O NE is used to print the process of invoking Functions}log.info "XXXXXX 2"Result:Tue Oct 21:47:38 CST 2015:info:xxxxxx 1Tue Oct 21:47:38 CST 2015:info:some error 3Tue Oct 21:47:38 CST 2015:info: XXXXXX 2[Training Video-5] [

Grails website http://www.grails.org/is the way to introduce grails.1 It can run on a Java virtual machine, combined with Java's first-Class 2 rapid development 3 using Java-like Dynamic Language 4 conventions better than configuration 5 reduce repetitive development 6 inspiration from Ruby7 Powerful plug-in system8 IDE SupportI am more inclined to the above advantages of 2nd and 4, really very convenient.H

We know that using the Grails class creation tool such as "Grails Create-domain-class" in a grails project can help us create classes such as domain, service, and controller and their test classes and others. As a result, we often use these tools in our grails projects to help us create classes instead of creating them

Grails actually has some of its own project management commands, such as Grails package,grails test-app,grails War. But the company is now basically using MAVEN to manage the project, so for the purpose of unified management, we have also let the Grails project be managed by

To add a dynamically refreshed bean to a Spring application with Groovy Introduction: The Spring Framework provides a solid foundation for WEB and enterprise applications. By supporting dynamic languages such as Groovy, Spring adds features that make the application architecture more flexible and dynamic. In this 2nd and final installment of a better series of spring through

Since some people say that NetBeans's support for grails is a bit better than eclipse, I've also tried how NetBeans projects are developed in the same way. It is also troublesome to hear that the version of the Grails plugin was installed prior to NetBeans, but in the last two days I went to the Grails official web site and found that the latest NetBeans 6.5 has