信息

• 评级：4星
• 版本：0.9.4
• 更新：2013-09-27
• 适用：Grails2.0.0 > *

简介

创建简单的图像验证码，防止自动完成和提交HTML表单

安装

    compile ":simple-captcha:0.9.4"

使用

页面访问

    Type the letters above in the box below:
    

后台调用

    class MyController {    def simpleCaptchaService    // This is the action that handles the submission of the form with the CAPTCHA    def save = {         boolean captchaValid = simpleCaptchaService.validateCaptcha(params.captcha)     } }

配置

在Config.groovy中增加

    simpleCaptcha {    // font size used in CAPTCHA images    fontSize = 30    height = 200    width = 200    // number of characters in CAPTCHA text     length = 6    // amount of space between the bottom of the CAPTCHA text and the bottom of the CAPTCHA image     bottomPadding = 16    // distance between the diagonal lines used to obfuscate the text     lineSpacing = 10    // the charcters shown in the CAPTCHA text must be one of the following     chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"    // this param will be passed as the first argument to this java.awt.Font constructor     // http://docs.oracle.com/javase/6/docs/api/java/awt/Font.html#Font(java.lang.String,%20int,%20int)     font = "Serif"}

应用

创建测试工程

    $grails create-app example-simplecaptcha$grails create-domain-class com.example.user

给domain增加属性

    package com.exampleclass User {    String username    String fullname    String password    static constraints = {        username()        fullname()        password()    }}

引入插件，生成脚手架

    $grails install-plugin simple-captcha$grails compile$grails generate-all com.example.user

修改views/user/_form.gsp，在代码最后增加

    
    
    
         
     Type the letters above in the box below:    
     
    

修改controllers/UserController.groovy，修改save方法

    def save() {    boolean captchaValid = simpleCaptchaService.validateCaptcha(params.captcha)    if(!captchaValid) {        flash.message = "验证码错误"        render(view: "create")        return    }    def userInstance = new User(params)    if (!userInstance.save(flush: true)) {        render(view: "create", model: [userInstance: userInstance])        return    }    flash.message = message(code: 'default.created.message', args: [message(code: 'user.label', default: 'User'), userInstance.id])    redirect(action: "show", id: userInstance.id)}

参考

• 插件
• 参考书-apress-Beginning Groovy, Grails and Griffon