(四)play之yabe项目【页面】

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显示当前发表博客的完整内容，以及历史博客列表

 

Bootstrap Job

一个play job任务就是一个在没有任何http请求的情况下执行一些特定的方法

应用程序在启动时或间隔一定时间后自动执行某个方法

应用程序启动便执行基础数据的初始化操作：

import models.User;
import play.jobs.Job;
import play.jobs.OnApplicationStart;
import play.test.Fixtures;

/**
 * 使用@OnApplicationStart注释Job，告诉Play在应用程序启动时便执行这个任务
 * DEV模式和PROD模式下，任务执行情况不同
 * 		DEV模式：等到第一个客户端请求才会执行
 * 		PROD模式：应用程序启动时就执行
 * @author lenovo
 *
 */

@OnApplicationStart
public class Bootstrap extends Job {
	
	public void doJob() {
		//检查用户是否为空
		if(User.count()==0) {
			Fixtures.loadModels("initial-data.yml");
		}
	}
	
}

    其中，在yabe\conf目录下新建initial-data.yml文件，用来初始化Blog系统的基础数据！

           

# Test data

User(bob):
    email:          [e-mail]
    password:       secret
    fullname:       Bob
    isAdmin:        true
    
User(jeff):
    email:          [e-mail]
    password:       secret
    fullname:       Jeff    
    
User(paul):
    email:          [e-mail]
    password:       secret
    fullname:       Paul    
    
    
Post(firstBobPost):
    title:          About the model layer
    postedAt:       2009-06-14
    author:         bob
    content:        >
                    The model has a central position in a Play! application. It is the domain-specific 
                    representation of the information on which the application operates.
                     
                    Martin fowler defines it as :
                        
                    Responsible for representing concepts of the business, information about the 
                    business situation, and business rules. State that reflects the business situation 
                    is controlled and used here, even though the technical details of storing it are 
                    delegated to the infrastructure. This layer is the heart of business software.

Post(secondBobPost):
    title:          Just a test of YABE
    postedAt:       2009-03-25
    author:         bob
    content:        >
                    Well, it's just a test.
                    
Post(jeffPost):
    title:          The MVC application
    postedAt:       2009-06-06
    author:         jeff
    content:        >
                    A Play! application follows the MVC architectural pattern as applied to the 
                    architecture of the Web.
                     
                    This pattern splits the application into separate layers: the Presentation 
                    layer and the Model layer. The Presentation layer is further split into a 
                    View and a Controller layer.
                    
Comment(c1):
    author:         Guest
    content:        >
                    You are right !
    postedAt:       2009-06-14
    post:           firstBobPost
    
Comment(c2):
    author:         Mike
    content:        >
                    I knew that ...
    postedAt:       2009-06-15
    post:           firstBobPost    
    
Comment(c3):
    author:         Tom
    content:        >
                    This post is useless ?
    postedAt:       2009-04-05
    post:           secondBobPost    

  

 

     打开yabe\app\controllers\Application.java，修改index()

package controllers;

import play.*;
import play.mvc.*;

import java.util.*;

import models.*;

public class Application extends Controller {

    public static void index() {
    	//最新的博客
        Post frontPost = Post.find("order by postedAt desc").first();
        //过去的博客
        List<Post> olderPosts = Post.find("order by postedAt desc").from(1).fetch(10);
        
        render(frontPost,olderPosts);
    }

}

 

修改yabe\app\views\Application\index.html

action通过render()传递对象，在模块中只需要使用${xxx}就能获取到相应的对象，进而展现数据。

 

#{extends 'main.html' /}
#{set title:'Home' /}

#{if frontPost}
	<div class="post">
		<h2 class="post-title">
			<a href="#">${frontPost.title}</a>
		</h2>
		<div class="post-metadata">
			<span class="post-author">by ${frontPost.author.fullname}</span>
			<span class="post-date">${frontPost.postedAt.format('MMMdd')}</span>
			<span class="post-comments">
				&nbsp;|&nbsp;
				${frontPost.comments.size() ?: 'no'}
				comment${frontPost.comments.size().pluralize()}
				#{if frontPost.comments}
					, latest by ${frontPost.comments[-1].author}
				#{/if}
			</span>
		</div>
		<div class="post-content">
			${frontPost.content.nl2br()}
		</div>
	</div>
	
	#{if olderPosts}
		<div class="older-posts">
			<h3>
				Older posts <span class="from">from this blog</span>
			</h3>
			#{list items:olderPosts, as:'oldPost'}
				<div class="post">
					<h2 class="post-title">
						<a href="#">${oldPost.title}</a>
					</h2>
					<div class="post-metadata">
						<span class="post-author">by ${oldPost.author.fullname}</span>
						<span class="post-date">${oldPost.postedAt.format('dd MMM yy')}</span>
						<div class="post-comments">
							${oldPost.comments.size() ?: 'no'}
							comment${oldPost.comments.size().pluralize()}
							#{if oldPost.comments}
								- latest by ${oldPost.comments[-1].author}
							#{/if}
						</div>
					</div>
				</div>
			#{/list}
		</div>
	#{/if}
	
#{/if}

#{else}
	<div class="empty">
		There is currently nothing to read here!
	</div>
#{/else}

 

刷新页面http://localhost:9000/

抽取相同部分出来，提高代码复用性

新增yabe\app\views\tags\display.html 

display.html被index.html使用标签(另一个模板)方式进行操作

由于index.html中通过#{display post:frontPost, as:'home' /}来调用display.html模板

则display.html中就可以通过_post 和 _as 来获取对应的参数值

#{extends 'main.html' /}
#{set title:'Home' /}

<div class="post ${_as == 'teaser' ? 'teaser' : ''}">
	<h2>
		<a href="#">${_post.title}</a>
	</h2>
	<div class="post-metadata">
		<span class="post-author">by ${_post.author.fullname}</span>
		<span class="post-date">${_post.postedAt.format('dd MMM yy')}</span>
		#{if _as!='full'}
			<span class="post-comments">
				&nbsp;|&nbsp;
				${_post.comments.size() ?: 'no'}
				comment${_post.comments.size().pluralize()}
				#{if _post.comments}
					, latest by ${_post.comments[-1].author}
				#{/if}
			</span>
		#{/if}
	</div>
	
	#{if _as!='teaser'}
		<div class="post-content">
			<div class="about">Detail:</div>
			${_post.content.nl2br()}
		</div>
	#{/if}
</div>

#{if _as=='full'}
	<div class="comments">
		<h3>
			${_post.comments.size() ?: 'no'}
			comment${_post.comments.size().pluralize()}
		</h3>
		#{list items:_post.comments, as:'comment'}
			<div class="comment">
				<div class="comment-metadata">
					<span class="comment-author">by ${comment.author},</span>
					<span class="comment-data">${comment.postedAt.format('dd MMM yy')}</span>
				</div>
				<div class="comment-content">
					<div class="about">Detail: </div>
					${comment.content.escape().nl2br()}
				</div>
			</div>
		#{/list}
	</div>
#{/if}

 修改index.html，直接通过display模板完成页面的显示

#{extends 'main.html' /}
#{set title:'Home' /}

#{if frontPost}
        <!--调用display模板-->
	#{display post:frontPost, as:'home' /}
	
	#{if olderPosts.size()}
		<div class="older-posts">
			<h3>
				Older posts <span class="form">from this blog</span>
			</h3>
			#{list items:olderPosts ,as:'oldPost'}
                                <!--调用display模板-->
				#{display post:oldPost, as:'teaser' /}
			#{/list}
		</div>
	#{/if}
	
#{/if}

#{else}
	<div class="empty">
		There is currently nothing to read here!
	</div>
#{/else}

 刷新页面

 

 修改yabe\public\stylesheets\main.css，对页面进行美观修饰

 

附：main.css

/** Main layout **/

html, body {
    background: #364B66 !important;
    font-family: Helvetica, Arial, Sans !important;
}

body {
    width: 900px;
    padding: 0 30px;
    margin: auto;
}

/** Blog header **/

#header {
    padding: 10px 0;
    position: relative;
}

#logo {
    display: block;
    height: 49px;
    margin-left: 20px;
    color: #fff;
    font-size: 48px;
    font-weight: bold;
    letter-spacing: -4px;
    text-shadow: 1px 2px 2px #000;
}

#logo span {
    color: #f00;
    font-size: 70%;
}

#tools {
    list-style: none;
    margin: 0;
    padding: 0;
    position: absolute;
    right: 0;
    top: 30px;
    right: 20px;
}

#tools a {
    color: #fff;
    text-decoration: none;
}

#title {
    background: #B8C569;
    padding: 20px 30px 30px 20px;
    margin: 20px 0;
    color: #3C4313;
    position: relative;
    -webkit-border-radius: 16px;
    -webkit-box-shadow: 0 2px 0 #93A045;
    -moz-border-radius: 16px;
}

/** A little hacky to create arrows without images **/
.about {
    text-indent: -999em;
    display: block;
    width: 0; 
    height: 0; 
	border-left: 10px solid transparent; 
	border-right: 10px solid transparent;
	border-bottom: 10px solid #BAC36E;
	border-top: 0;
	position: absolute;
	top: -10px;
	left: 60px;
}

#title h1 {
    font-size: 64px;
    margin: 0;
}

#title h1 a {
    text-decoration: none;
    color: inherit;
}

#title h2 {
    font-size: 26px;
    margin: 0;
    font-weight: normal;
}

/** Main content **/

#main {
    background: #314660;
    background: -webkit-gradient(linear, left top, left 30%, from(#314660), to(#364B66));
    -webkit-border-radius: 16px;
    -moz-border-radius: 16px;
    padding: 20px;
}

/** Post **/

.post .post-title {
    margin: 0;
}

.post .post-title a {
    font-size: 36px;
    color: #F5C2CC;
    text-decoration: none;
}

.post .post-metadata {
    color: #BAC36E;
    display: block;
    font-size: 70%;
    display: inline-block;
}

.post .post-author {
    font-size: 130%;
    font-weight: bold;
}

.post .post-metadata a {
    color: #9FA85D;
}

.post .post-content {
    position: relative;
    background: #fff;
    padding: 10px;
    margin: 10px 0 50px 0;
    -webkit-border-radius: 10px;
    -moz-border-radius: 10px;
    -webkit-box-shadow: 0 2px 0 #BBBBBB;
}

.post .about {
    text-indent: -999em;
    display: block;
    width: 0; 
    height: 0; 
	border-left: 10px solid transparent; 
	border-right: 10px solid transparent;
	border-bottom: 10px solid #fff;
	border-top: 0;
	position: absolute;
	top: -6px;
	left: 24px;
}


/** Older posts **/

.older-posts h3 {
    color: #869AB1;
    font-size: 28px;
    margin-bottom: 15px;
}

.older-posts h3 .from {
    font-weight: normal;
    font-size: 70%;
}

.older-posts .post {
    margin-bottom: 15px;
    border-left: 3px solid #869AB1;
    padding-left: 10px;
}

.older-posts .post-title a {
    padding: 0;
    color: #131921;
    font-size: 20px;
}

.older-posts .post-metadata {
    color: #869AB1;
    padding: 0;
    font-size: 12px;
}

.older-posts .post-metadata a {
    color: #869AB1;
}

/** Comments **/

.comments {
    margin-bottom: 30px;
}

h3 {
    color: #869AB1;
    font-size: 18px;
    margin-bottom: 15px;
}

h3 span {
    font-size: 80%;
    font-weight: normal;
}

.comment {
    width: 70%;
    clear: both;
}

.comment .comment-metadata {
    color: #869AB1;
    display: block;
    font-size: 50%;
    display: block;
    float: left;
    width: 80px;
    text-align: right;
}

.comment .comment-author {
    font-size: 150%;
    font-weight: bold;
    display: block;
}

.comment .comment-content {
    position: relative;
    background: #E4EAFF;
    color: #242C58;
    font-size: 80%;
    margin-top: 10px;
    margin-bottom: 10px;
    margin-left: 100px;
    padding: 10px;
    -webkit-border-radius: 10px;
    -moz-border-radius: 10px;
}

.comment .about {
    text-indent: -999em;
    display: block;
    width: 0; 
    height: 0; 
	border-top: 10px solid transparent; 
	border-bottom: 10px solid transparent;
	border-right: 10px solid #E4EAFF;
	border-left: 0;
	position: absolute;
	top: 4px;
	left: -4px;
}

/** Form **/

form {
    padding: 10px;
    background: #253142;
    background: -webkit-gradient(linear, left top, left 60%, from(#253142), to(#364B66));
    -webkit-border-radius: 10px;
    -moz-border-radius: 10px;
}

form .error {
    background: #c00;
    color: #fff;
    font-size: 90%;
    padding: 3px 5px;
    -webkit-border-radius: 6px;
    -moz-border-radius: 6px;
    -webkit-box-shadow: 0 2px 0 #800;
}

form .error:empty {
   display: none;  
}

form p {
    margin: 5px 0 0 0;
}

form textarea {
    width: 70%;
    height: 150px;
}

form input, form textarea {
    font-size: 14px;
}

form label {
    display: block;
    font-weight: bold;
    font-size: 90%;
    color: #aaa;
    margin-bottom: 3px;
}

#captcha{
    display: block;
    height: 50px;  
}

.success {
    background: #67AD10;
    color: #fff;
    padding: 10px;
    -webkit-border-radius: 6px;
    -moz-border-radius: 6px;
    -webkit-box-shadow: 0 2px 0 #4E840B; 
}

/** Pagination **/

#pagination {
    list-style: none;
    padding: 0;
    position: relative;
    color: #869AB1;
    font-size: 90%;
    top: -20px;
    margin-bottom: 30px;
}

#pagination a {
    color: #869AB1;
    font-size: 90%;
}

#pagination #previous {
    position: absolute;
    top: 0;
    left: 0;
}

#pagination #previous:before {
    content: '<< ';
}

#pagination #next {
    position: absolute;
    top: 0;
    right: 0;
}

#pagination #next:after {
    content: ' >>';
}

/** Footer **/

#footer {
    border-top: 1px solid #45597A;
    font-size: 70%;
    padding: 10px 30px;
    text-align: center;
    color: #869AB1;
    margin-top: 30px;
}

#footer a {
    color: #869AB1;
    font-weight: bold;
}

/** Admin **/

.tags-list .tag {
    cursor: pointer;
    color: red;
}

#adminMenu {
    list-style: none;
    padding: 0;
    margin: 0 0 20px 0;
}

#adminMenu li {
    display: inline;
}

#adminMenu li a {
    color: #fff;
    text-decoration: none;
    font-size: 80%;
    background: #591C64;
    padding: 2px 10px;
    -webkit-border-radius: 9px;
    -moz-border-radius: 9px;
}

#adminMenu li.selected a {
    background: #82A346;
}

#crudContent {
    color: #8B98AD;
}

#crudContent h2 {
    color: #EDC3CD !important;
}

#crudContent thead tr {
    background: #512162 !important;
}

#crudContent table {
    border: none !important;
}

#crudContent table td {
    color: #444;
}

tr.odd {
    background: #BECCE7 !important;
}

#crud #crudContent, #crudContent form, #crudListSearch, #crudListPagination, .crudButtons {
    background: transparent;
    border: none;
    padding: 0;
}

#crudListTable {
    margin: 10px 0;
}

.crudField, .objectForm {
    border: none;
    padding-left: 0;
}

.crudField label {
    color: #B8FA5C;
}

.crudHelp {
    color: #fff !important;
}

.crudField .tag {
    color: #111;
    font-size: 80%;
}

.crudButtons input {
    font-size: 110%;
}

.crudButtons {
    margin-top: 20px;
    border-top: 1px dotted #8B98AD;
    padding-top: 10px;
}

.crudFlash {
    border: 0;
    -webkit-border-radius: 8px;
    font-size: 80%;
    padding: 2px 10px;
}

.crudField .tag.selected {
    -webkit-border-radius: 8px;
    -moz-border-radius: 8px;
}

.crudField .error {
    background: transparent;
    border: none;
    padding: 0;
    color: pink;
    -webkit-box-shadow: none;
}

/** Login **/

#login form {
    background: #8B98AD !important;
    border: 0 !important;
    -webkit-border-radius: 16px;
    -moz-border-radius: 16px;
}

#login label, #password-field label, #username-field label {
    color: #161D28 !important;
    font-size: 110% !important;
}


#remember-field {
    display: none;
}

/** My posts **/

#admin .post {
    background: #fff;
    padding: 4px;
    margin: 0;
    font-size: 90%;
}

#admin .post.odd {
    background: #C0CBE5;
}

#admin .post a {
    color: #444;
}

#newPost {
    border-top: 1px dotted #C0CBE5;
    padding-top: 15px;
}

#newPost a {
    background: #C88116;
    -webkit-border-radius: 12px;
    -moz-border-radius: 12px;
    padding: 5px 10px;
    font-size: 80%;
    text-decoration: none;
    color: #fff;
    font-weight: bold;
    -webkit-box-shadow: 1px 1px 2px rgba(0,0,0,.3);
}

#newPost a span {
    background: #7D510E;
    -webkit-border-radius: 8px;
    -moz-border-radius: 8px;
    padding: 0 5px 2px 5px;
    position: relative;
    top: -1px;
}

#postContent {
    width: 100%;
    height: 300px;
}

.hasError {
    background: pink;
}

 

评论

3 楼 jacksondesign 2013-11-26  

有，和YAML的格式有关，不知道有没有什么好的YAML格式的验证工具没有

2 楼 schy_hqh 2013-11-25  

确定你的User类里面有email属性？
生成getter/setter方法了没有啊？

1 楼 jacksondesign 2013-11-25  

Execution exception
RuntimeException occured : Cannot load fixture initial-data.yml: org.hibernate.PropertyAccessException: could not get a field value by reflection getter of models.User.email

In /app/models/Bootstrap.java (around line 20)
16:
public void doJob()
17:
{
18:
if(User.count() == 0)
19:
{
20:
Fixtures.loadModels("initial-data.yml");
21:
}
22:
}
23:
}
这句话会报异常说是没有办法反射 ，不明白为什么