golang学习之go简单博客应用
先说说golang的语法吧，个人觉得有以下特点：
- 简洁，不管是变量、方法声明，还是代码编写，均十分简洁，效率也比较高
- 非纯粹面向对象，但是go的struct类似c的struct，go的结构体还可以进行struct的包含，被包含的struct的方法被外层struct共享
- 指针，方法传参时可以直接传指针，相比传值更加快速
- 接口，go中规定，如果一个对象（struct）实现了interface中的所有方法，那么该struct便实现该接口
- chan的定义，用来各个线程（有人叫协程，超轻量级）间的通信，基本不用考虑死锁等问题
- 默认大写开头的结构体、方法等为public公有，小写开头为private私有
go的特性还有很多，菜鸟就不多说了，下面是一个用go开发的博客应用，功能比较简单，直接上菜：
系统环境
go版本：1.5rc1
系统：win7
数据库：mongodb（使用mgo操作）
web框架：revel
样式：bootstrap
页面效果
博客主页：
新建博客：
联系：
博客详情：
界面差不多就是这样，很简单吧，下节笔记是博客新增部分，慢慢来。。。
Header页
<div class="container-fluid">
<div class="row-fluid">
<div class="span12">
<div class="page-header">
<h3>基于Golang实现的博客应用iBlog</h3>
<h4><small>数据库采用mongodb（mgo）、页面样式使用bootstrap（布局参考csdn）、整体实现采用Revel，Revel地址：<a href="http://revel.github.io/docs/godoc/index.html" target="_blank">http://revel.github.io/docs/godoc/index.html</a></small></h4>
<h4><small>时间：2015.12.</small></h4>
</div>
<div class="navbar navbar-inverse" style="margin-top:1px;">
<div class="navbar-inner">
<div class="container-fluid">
<a class="btn btn-navbar" data-target=".navbar-responsive-collapse" data-toggle="collapse"></a> <a class="brand" href="#">iBlog</a>
<div class="nav-collapse collapse navbar-responsive-collapse">
<ul class="nav">
<li class="{{.home}}">
<a href="/">主页</a>
</li>
<li class="{{.blog}}">
<a href="/blog">新博客</a>
</li>
<li class="{{.contact}}">
<a href="javascript:contact()">联系</a>
</li>
</ul>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
Footer页
<script type="text/javascript">
function contact(){
jQuery.dialog({
title: '关于我',
content: '姓名：caiya928' + '<br/>' + '地址：陕西-西安' + '<br/>' + '博客：<a href="http://www.cnblogs.com/caiya928" target="_blank">http://www.cnblogs.com/caiya928</a>'
});
}
</script>
项目结构
首页页面实现
<!DOCTYPE html>
<html>
<head>
{{set . "title" "iBlog博客"}}
{{set . "home" "active" }}
<title>{{.title}}</title>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<link rel="shortcut icon" type="image/png" href="/public/img/favicon.png">
<link href="/public/bootstrap/css/bootstrap.css" rel="stylesheet">
<link href="/public/css/header.css" rel="stylesheet">
<link href="/public/bootstrap/css/bootstrap-responsive.css" rel="stylesheet">
<link href="/public/bootstrap/css/jquery-confirm.css" rel="stylesheet">
<script src="/public/js/jquery-1.9.1.min.js" type="text/javascript" charset="utf-8"></script>
<script src="/public/bootstrap/js/bootstrap.js"></script>
<script src="/public/bootstrap/js/jquery-confirm.js"></script>
</head>
<body>
{{template "header.html" .}}
<div class="container-fluid" style="margin-top:0px;">
<div class="row-fluid" style="margin-left:0px;margin-top:0px;">
<div class="span12" margin-top="200px;">
{{if .blogs}}
{{range $blog := .blogs}}
<div style="margin-left:0px;" class="span12">
<ul class="thumbnails">
<li >
<div class="caption" >
<h3><a style="color:#000" href="/bloginfo/{{$blog.Id_}}/{{$blog.ReadCnt}}">{{$blog.GetTitle }}</a></h3>
<span class="label label-default">作者：{{$blog.Author}}</span>
<span class="label label-info">日期：{{$blog.CDate.Format "2006-01-02 15:04"}}</span>
<span class="label label-success">阅读：{{$blog.ReadCnt}}</span>
<p>{{$blog.GetContent}}</p>
</div>
</li>
</ul>
</div>
{{end}}
{{end}}
</div>
{{template "footer.html" .}}
</body>
</html>
控制器层配置
# Routes
# This file defines all application routes (Higher priority routes first)
# ~~~~ module:testrunner GET / App.Index
GET /blog App.Blog
GET /bloginfo/:id/:rcnt App.BlogInfo
POST /save WBlog.Save
POST /saveComment Comment.SaveComment
# Ignore favicon requests
GET /favicon.ico # Map static resources from the /app/public folder to the /public path
GET /public/*filepath Static.Serve("public") # Catch all
* /:controller/:action :controller.:action
页面跳转控制层App.go
package controllers import (
"github.com/revel/revel"
"myapp/app/modules"
) type App struct {
*revel.Controller
} func (c App) Index() revel.Result {
dao, err := modules.Conn()
if err != nil {
c.Response.Status =
return c.RenderError(err)
}
defer dao.Close()
blogs := dao.FindBlogs()
return c.Render(blogs)
} func (c App) Blog() revel.Result {
return c.Render()
} func (c App) BlogInfo(id string, rcnt int) revel.Result {
dao, err := modules.Conn()
if err != nil {
c.Response.Status =
return c.RenderError(err)
}
defer dao.Close()
blog := dao.GetBlogFromId(id)
if blog.ReadCnt == rcnt {
blog.ReadCnt = rcnt +
dao.UpdateBlogById(id, blog)
}
comments := dao.GetCommentsFromBlogId(blog.Id_)
blog.CommentCnt = len(comments)
dao.UpdateBlogById(id, blog)
return c.Render(blog, rcnt, comments)
}
数据库Dao层
package modules import (
"gopkg.in/mgo.v2"
) const (
CommentCollection = "comment"
DbName = "blog"
UserCollection = "user"
BlogCollection = "blog"
MessageCollection = "message"
) type Dao struct {
session *mgo.Session
} func Conn() (*Dao, error) {
session, err := mgo.Dial("localhost")
if err != nil {
return nil, err
}
return &Dao{session}, nil
} func (dao *Dao) Close() {
dao.session.Close()
}
新增博客页面
<!DOCTYPE html>
<html>
<head>
{{set . "title" "新博客"}}
{{set . "blog" "active"}}
<title>{{.title}}</title>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<link rel="shortcut icon" type="image/png" href="/public/img/favicon.png">
<link href="/public/bootstrap/css/bootstrap.css" rel="stylesheet">
<link href="/public/css/header.css" rel="stylesheet">
<link href="/public/bootstrap/css/bootstrap-responsive.css" rel="stylesheet">
<link href="/public/bootstrap/css/jquery-confirm.css" rel="stylesheet">
<script src="/public/js/jquery-1.9.1.min.js" type="text/javascript" charset="utf-8"></script>
<script src="/public/bootstrap/js/bootstrap.js"></script>
<script src="/public/bootstrap/js/jquery-confirm.js"></script>
</head>
<body>
{{template "header.html" .}}
<div class="container-fluid" style="margin-top:0px;">
<div class="row-fluid" style="margin-left:5px;margin-top:0px;">
<div class="row-fluid" style="margin-left:5px;margin:0px auto;border:0px;">
<div class="span12" style="border:1px solid #ccc;border-radius: 5px;padding:10px;">
<form action="/save" method="post">
<div class="form-group">
<h4>标题</h4>
{{with $field := field "blog.Title" .}}
<input type="text" id="{{$field.Id}}" style="width:40%" class="form-control" name="{{$field.Name}}" placeholder="请输入您的博客标题" value="{{$field.Flash}}" >
<span class="help-inline erro">{{$field.Error}}</span>
{{end}}
</div>
<div class="form-group">
<h4>内容</h4>
{{with $field := field "blog.Content" .}}
<textarea class="form-control" id="{{$field.Id}}" name="{{$field.Name}}" rows="" style="width:60%" placeholder="请输入您的博客内容">{{$field.Flash}}</textarea>
<span class="help-inline erro">{{$field.Error}}</span>
{{end}}
</div>
<div class="form-group" style="margin-left:57%">
<button type="submit" class="btn btn-success">提交</button>
</div>
</form>
</div>
</div>
</div>
</div>
</body>
</html>
{{template "footer.html" .}}
博客模型层
package modules import (
"github.com/revel/revel"
"gopkg.in/mgo.v2/bson"
"time"
) type Blog struct {
Id_ string `bson:"_id"`
CDate time.Time
Title string
Content string
ReadCnt int
Year int
Author string
CommentCnt int
} //新建博客
func (dao *Dao) CreateBlog(blog *Blog) error {
BlogCollection := dao.session.DB(DbName).C(BlogCollection)
blog.CDate = time.Now()
blog.Year = blog.CDate.Year()
blog.ReadCnt =
blog.CDate = time.Now()
blog.Id_ = bson.NewObjectId().Hex()
blog.Author = "匿名"
blog.Year = blog.CDate.Year()
err := BlogCollection.Insert(blog) //先根据Id查找，然后更新或插入
if err != nil {
revel.WARN.Printf("Unable to save blog:%v error % v", blog, err)
}
return err
} //获取Title
func (blog *Blog) GetTitle() string {
if len(blog.Title) > {
return blog.Title[:]
}
return blog.Title
} //获取Content
func (blog *Blog) GetContent() string {
if len(blog.Content) > {
return blog.Content[:]
}
return blog.Content
} //查询所有博客
func (dao *Dao) FindBlogs() []Blog {
BlogCollection := dao.session.DB(DbName).C(BlogCollection)
blogs := []Blog{}
query := BlogCollection.Find(bson.M{}).Sort("-cdate").Limit() //结果根据cdate倒序
query.All(&blogs)
return blogs
} //前台数据提交校验
func (blog *Blog) Validate(v *revel.Validation) {
v.Check(blog.Title, revel.Required{}, revel.MinSize{}, revel.MaxSize{})
v.Check(blog.Content, revel.Required{}, revel.MinSize{})
} //根据id查询Blog对象
func (dao *Dao) GetBlogFromId(id string) *Blog {
BlogCollection := dao.session.DB(DbName).C(BlogCollection)
blog := new(Blog)
query := BlogCollection.Find(bson.M{"_id": id})
query.One(blog)
return blog
} func (dao *Dao) UpdateBlogById(id string, blog *Blog) {
blogCollection := dao.session.DB(DbName).C(BlogCollection)
err := blogCollection.Update(bson.M{"_id": id}, blog)
if err != nil {
revel.WARN.Printf("Unable to update blog: %v error %v", blog, err)
}
}
博客Action层
package controllers import (
"fmt"
"github.com/revel/revel"
"myapp/app/modules"
"strings"
) type WBlog struct {
App //结构体包含
} func (c WBlog) Save(blog *modules.Blog) revel.Result {
blog.Title = strings.TrimSpace(blog.Title)
blog.Content = strings.TrimSpace(blog.Content)
blog.Validate(c.Validation)
if c.Validation.HasErrors() {
c.Validation.Keep()
c.FlashParams()
fmt.Println(c.Validation)
return c.Redirect(App.Blog)
}
dao, err := modules.Conn()
if err != nil {
c.Response.Status =
return c.RenderError(err)
}
defer dao.Close()
err = dao.CreateBlog(blog)
if err != nil {
c.Response.Status =
return c.RenderError(err)
}
return c.Redirect(App.Index)
}
博客详情页
<!DOCTYPE html>
<html>
<head>
{{set . "title" "博客详情"}}
{{set . "home" "active" }}
<title>{{.title}}</title>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<link rel="shortcut icon" type="image/png" href="/public/img/favicon.png">
<link href="/public/bootstrap/css/bootstrap.css" rel="stylesheet">
<link href="/public/css/header.css" rel="stylesheet">
<link href="/public/bootstrap/css/bootstrap-responsive.css" rel="stylesheet">
<link href="/public/bootstrap/css/jquery-confirm.css" rel="stylesheet">
<script src="/public/js/jquery-1.9.1.min.js" type="text/javascript" charset="utf-8"></script>
<script src="/public/bootstrap/js/bootstrap.js"></script>
<script src="/public/bootstrap/js/jquery-confirm.js"></script>
</head>
<body>
{{template "header.html" .}}
<div style="margin-left:5px;" class="span12">
{{if .blog}}
<div class="content" style="border:1px solid #ccc;border-radius: 5px;padding:10px;">
<ul class="thumbnails">
<li>
<div class="caption" >
<h3>{{.blog.Title}}</h3>
<span class="label label-default">作者：{{.blog.Author}}</span>
<span class="label label-info">日期：{{.blog.CDate.Format "2006-01-02 15:04"}}</span>
<span class="label label-success">阅读：{{.blog.ReadCnt}}</span>
</div>
</li>
</ul>
<p>{{.blog.Content}}</p>
</div>
<div class="comment" style="margin-top:20px;">
{{if .comments}}
<div class="comments" style="border:1px solid #ccc;border-radius: 5px;padding:10px;">
<h4>回复</h4>
<hr>
<dl class="the-comments">
{{range $index,$comment := .comments}}
<dd >
<span class="label label-default pull-right">#{{pls $index }}</span>
<div class="user-info" style="margin-top:15px;">
<a href="#"><strong>{{$comment.Email}}</strong></a>
<span style="margin-left:10px;" class="label label-default">日期：{{$comment.CDate.Format "2006-01-02 15:04" }}</span>
</div>
<div class="user-comment" style="margin-top:15px;">
<p>{{$comment.Content}}</p>
</div>
</dd>
{{end}}
</dl>
</div>
{{end}}
</div>
<div class="comments" style="border:1px solid #ccc;border-radius: 5px;padding:10px;margin-top:20px;">
<div class="comment-form">
<form action="/saveComment" method="post">
<input type="hidden" name="id" value="{{.blog.Id_}}">
<input type="hidden" name="rcnt" value="{{.rcnt}}">
<div class="form-group">
<h4>邮箱</h4>
{{with $field := field "comment.Email" .}}
<input style="width:50%" type="email" class="form-control" id="{{$field.Id}}" name="{{$field.Name}}" placeholder="请输入您的联系方式" required value="{{if $field.Flash}}{{$field.Flash}}{{else}}{{$field.Value}}{{end}}">
<span class="help-inline erro">{{$field.Error}}</span>
{{end}}
</div>
<div class="form-group">
<h4>评论</h4>
{{with $field := field "comment.Content" .}}
<textarea style="width:70%" class="form-control" id="{{$field.Id}}" name="{{$field.Name}}" rows="" placeholder="请输入您的回复" required >{{if $field.Flash}}{{$field.Flash}}{{else}}{{$field.Value}}{{end}}</textarea>
{{end}}
</div>
<div class="form-group">
<button type="submit" style="margin-left:66.5%" class="btn btn-success">提交</button>
</div>
</form>
</div>
</div>
{{end}}
{{template "footer.html" .}}
</body>
</html>
评论功能Dao层
package modules import (
"github.com/revel/revel"
"gopkg.in/mgo.v2/bson"
"time"
) type Comment struct {
Id_ string `bson:"_id"`
BlogId string
Email string
CDate time.Time
Content string
} func (comment *Comment) Validate(v *revel.Validation) {
v.Check(comment.Email, revel.Required{}, revel.MaxSize{})
v.Check(comment.Content, revel.Required{}, revel.MinSize{}, revel.MaxSize{})
} func (dao *Dao) InsertComment(comment *Comment) error {
commentCollection := dao.session.DB(DbName).C(CommentCollection)
comment.CDate = time.Now()
err := commentCollection.Insert(comment)
if err != nil {
revel.WARN.Printf("Unable to save Comment: %v error %v", comment, err)
}
return err
} func (dao *Dao) GetCommentsFromBlogId(id string) []Comment {
commentCollection := dao.session.DB(DbName).C(CommentCollection)
comments := []Comment{}
query := commentCollection.Find(bson.M{"blogid": id}).Sort("CDate")
query.All(&comments)
return comments
}
评论功能Action层
package controllers import (
"github.com/revel/revel"
"gopkg.in/mgo.v2/bson"
"myapp/app/modules"
"strings"
) type Comment struct {
App
} //保存评论
func (c Comment) SaveComment(id string, rcnt int, comment *modules.Comment) revel.Result {
if len(id) == {
return c.Redirect("/")
}
dao, err := modules.Conn()
if err != nil { //如果报错
c.Response.Status =
return c.Redirect("/")
}
defer dao.Close()
blog := dao.GetBlogFromId(id)
if blog == nil {
return c.Redirect("/")
}
comment.Id_ = bson.NewObjectId().Hex()
comment.BlogId = blog.Id_
comment.Content = strings.TrimSpace(comment.Content)
comment.Email = strings.TrimSpace(comment.Email)
comment.Validate(c.Validation)
if c.Validation.HasErrors() {
c.Validation.Keep()
c.FlashParams()
c.Flash.Error("Errs:The email and the content should not be null,or the maxsize of email is 50.")
return c.Redirect("/bloginfo/%s/%d", id, rcnt)
}
err = dao.InsertComment(comment)
if err != nil {
c.Response.Status =
return c.RenderError(err)
}
blog.CommentCnt++
dao.UpdateBlogById(id, blog)
return c.Redirect("/")
}
init.go初始化加载文件
package app
import "github.com/revel/revel"
func init() {
revel.TemplateFuncs["pls"] = func(a, b int) int {
return a + b
}
// Filters is the default set of global filters.
revel.Filters = []revel.Filter{
revel.PanicFilter, // Recover from panics and display an error page instead.
revel.RouterFilter, // Use the routing table to select the right Action
revel.FilterConfiguringFilter, // A hook for adding or removing per-Action filters.
revel.ParamsFilter, // Parse parameters into Controller.Params.
revel.SessionFilter, // Restore and write the session cookie.
revel.FlashFilter, // Restore and write the flash cookie.
revel.ValidationFilter, // Restore kept validation errors and save new ones from cookie.
revel.I18nFilter, // Resolve the requested language
HeaderFilter, // Add some security based headers
revel.InterceptorFilter, // Run interceptors around the action.
revel.CompressFilter, // Compress the result.
revel.ActionInvoker, // Invoke the action.
}
// register startup functions with OnAppStart
// ( order dependent )
// revel.OnAppStart(InitDB)
// revel.OnAppStart(FillCache)
}
// TODO turn this into revel.HeaderFilter
// should probably also have a filter for CSRF
// not sure if it can go in the same filter or not
var HeaderFilter = func(c *revel.Controller, fc []revel.Filter) {
// Add some common security headers
c.Response.Out.Header().Add("X-Frame-Options", "SAMEORIGIN")
c.Response.Out.Header().Add("X-XSS-Protection", "1; mode=block")
c.Response.Out.Header().Add("X-Content-Type-Options", "nosniff")
fc[](c, fc[:]) // Execute the next filter stage.
}
footer.css样式
.mbox dl dd{
margin-top:4px;
}
header.css
.page-header{
margin-top:2px;
margin-bottom:15px;
border-bottom: 1px solid #eeeeee;
}
body{
line-height:30px;
font-size: 16px;
padding:5px;
margin:5px;
font-family: "Helvetica Neue", Helvetica, Arial, sans-serif; */
}
li {
line-height: 30px;
}
.navbar .nav > li > a {
float: none;
padding: 15px 30px;
color: #777;
text-decoration: none;
text-shadow: 0 0px 0 #ffffff;
}
.nav{
margin:0px;
}
.span12{
padding:0 5px;
}
.brand{
padding:;
margin-top:5px;
font-size:10px;
}
.container-fluid{
padding:1px;
}
.form-search{
margin-top:11px;
}
好了，完整的代码就是这样，初学就当练习用的，发现bug还望直接指出。。。
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