Groovy轻松入门——Grails实战基础篇(3)

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 } }