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Groovy轻松入门——Grails实战基础篇

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在学习任何东西之前，最重要的是培养兴趣，Groovy世界最耀眼的技术之一

作者：山风小子来源：蛟龍居 2007年11月18日

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4，在“命令行”中，输入“grails create-controller Login”，创建登陆(login)的控制器LoginController，它对应MVC中的Controller，让它负责登陆相关业务，输出如下：

D:\Temp\grails_apps\demo>grails create-controller Login

Welcome to Grails 0.4.2 - http://grails.org/
Licensed under Apache Standard License 2.0
Grails home is set to: D:\D\MY_DEV\grails

Base Directory: D:\Temp\grails_apps\demo
Environment set to production
Running script D:\D\MY_DEV\grails\scripts\CreateController.groovy
    [mkdir] Created dir: D:\Temp\grails_apps\demo\grails-app\views\login
     [copy] Copying 1 file to D:\Temp\grails_apps\demo\grails-app\controllers
Created Controller at D:\Temp\grails_apps\demo/grails-app/controllers/LoginContr
oller.groovy
     [copy] Copying 1 file to D:\Temp\grails_apps\demo\grails-tests
Created ControllerTests at D:\Temp\grails_apps\demo/grails-tests/LoginController
Tests.groovy
D:\Temp\grails_apps\demo>

5，修改demo\grails-app\controllers\LoginController.groovy的内容为：

class LoginController {
    def loginService

    def index = { }
    
    def login = {
        User u = new User()
        u.properties = params
        if (params.name && params.password) {

            def user = loginService.check(u)
            
            if (user) {
                flash.message = "Welcome ${user.name}" 
                render(view: "ok", model: [user: user])
            } else {
                flash.error = "Invalid ${u.name} with ${u.password}"
                render(view: "login", model: [user: u])
            }    
        } else {
            render(view: "login", model: [user: u])
        }
    }
}

大家或许也看到了LoginService这个类，我将在后面演示创建它，这个LoginService类封装了所有登陆相关的业务逻辑，Grails自动将其注入到LoginController中。

6，在“命令行”中，输入“grails create-service Login”，创建LoginService.groovy，输出：

D:\Temp\grails_apps\demo>grails create-service Login

Welcome to Grails 0.4.2 - http://grails.org/
Licensed under Apache Standard License 2.0
Grails home is set to: D:\D\MY_DEV\grails

Base Directory: D:\Temp\grails_apps\demo
Environment set to production
Running script D:\D\MY_DEV\grails\scripts\CreateService.groovy
     [copy] Copying 1 file to D:\Temp\grails_apps\demo\grails-app\services
Created Service at D:\Temp\grails_apps\demo/grails-app/services/LoginService.gro
ovy
     [copy] Copying 1 file to D:\Temp\grails_apps\demo\grails-tests
Created ServiceTests at D:\Temp\grails_apps\demo/grails-tests/LoginServiceTests.
groovy
D:\Temp\grails_apps\demo>

7，修改demo\grails-app\services\LoginService.groovy的内容为：

class LoginService {
    
    boolean transactional = true
    
    def check(User u) {
        def user = User.findWhere(name: u.name, password: u.password)
        return user
    }
    
    def serviceMethod() {
        // TODO
    }
}

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