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James Miranda
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en/14.2.md
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en/14.2.md
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# 14.2 Session支持
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第六章的时候我们介绍过如何在Go语言中使用session，也实现了一个sessionManger，beego框架基于sessionManager实现了方便的session处理功能。
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## session集成
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beego中主要有以下的全局变量来控制session处理：
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//related to session
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SessionOn bool // 是否开启session模块，默认不开启
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SessionProvider string // session后端提供处理模块，默认是sessionManager支持的memory
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SessionName string // 客户端保存的cookies的名称
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SessionGCMaxLifetime int64 // cookies有效期
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GlobalSessions *session.Manager //全局session控制器
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当然上面这些变量需要初始化值，也可以按照下面的代码来配合配置文件以设置这些值：
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if ar, err := AppConfig.Bool("sessionon"); err != nil {
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SessionOn = false
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} else {
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SessionOn = ar
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}
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if ar := AppConfig.String("sessionprovider"); ar == "" {
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SessionProvider = "memory"
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} else {
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SessionProvider = ar
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}
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if ar := AppConfig.String("sessionname"); ar == "" {
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SessionName = "beegosessionID"
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} else {
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SessionName = ar
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}
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if ar, err := AppConfig.Int("sessiongcmaxlifetime"); err != nil && ar != 0 {
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int64val, _ := strconv.ParseInt(strconv.Itoa(ar), 10, 64)
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SessionGCMaxLifetime = int64val
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} else {
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SessionGCMaxLifetime = 3600
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}
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在beego.Run函数中增加如下代码：
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if SessionOn {
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GlobalSessions, _ = session.NewManager(SessionProvider, SessionName, SessionGCMaxLifetime)
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go GlobalSessions.GC()
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}
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这样只要SessionOn设置为true，那么就会默认开启session功能，独立开一个goroutine来处理session。
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为了方便我们在自定义Controller中快速使用session，作者在`beego.Controller`中提供了如下方法：
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func (c *Controller) StartSession() (sess session.Session) {
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sess = GlobalSessions.SessionStart(c.Ctx.ResponseWriter, c.Ctx.Request)
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return
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}
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## session使用
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通过上面的代码我们可以看到，beego框架简单地继承了session功能，那么在项目中如何使用呢？
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首先我们需要在应用的main入口处开启session：
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beego.SessionOn = true
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然后我们就可以在控制器的相应方法中如下所示的使用session了：
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func (this *MainController) Get() {
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var intcount int
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sess := this.StartSession()
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count := sess.Get("count")
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if count == nil {
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intcount = 0
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} else {
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intcount = count.(int)
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}
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intcount = intcount + 1
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sess.Set("count", intcount)
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this.Data["Username"] = "astaxie"
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this.Data["Email"] = "astaxie@gmail.com"
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this.Data["Count"] = intcount
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this.TplNames = "index.tpl"
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}
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上面的代码展示了如何在控制逻辑中使用session，主要分两个步骤：
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1. 获取session对象
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//获取对象,类似PHP中的session_start()
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sess := this.StartSession()
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2. 使用session进行一般的session值操作
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//获取session值，类似PHP中的$_SESSION["count"]
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sess.Get("count")
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//设置session值
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sess.Set("count", intcount)
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从上面代码可以看出基于beego框架开发的应用中使用session相当方便，基本上和PHP中调用`session_start()`类似。
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## links
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* [目录](<preface.md>)
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* 上一节: [静态文件支持](<14.1.md>)
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* 下一节: [表单及验证支持](<14.3.md>)
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# 14.2 Session
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Chapter VI, when we saw how to use the Go language session, also achieved a sessionManger, beego sessionManager based framework to achieve a convenient session handling functions.
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## Session integration
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beego mainly in the following global variables to control the session handling:
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// related to session
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SessionOn bool // whether to open the session module, the default is not open
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SessionProvider string // session backend processing module provided, the default is sessionManager supported memory
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SessionName string // client name saved in cookies
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SessionGCMaxLifetime int64 // cookies validity
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GlobalSessions *session.Manager// global session controller
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Of course, the above values of these variables need to be initialized, you can also follow the code to match the configuration file to set these values:
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if ar, err := AppConfig.Bool("sessionon"); err != nil {
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SessionOn = false
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} else {
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SessionOn = ar
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}
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if ar := AppConfig.String("sessionprovider"); ar == "" {
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SessionProvider = "memory"
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} else {
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SessionProvider = ar
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}
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if ar := AppConfig.String("sessionname"); ar == "" {
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SessionName = "beegosessionID"
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} else {
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SessionName = ar
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}
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if ar, err := AppConfig.Int("sessiongcmaxlifetime"); err != nil && ar != 0 {
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int64val, _ := strconv.ParseInt(strconv.Itoa(ar), 10, 64)
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SessionGCMaxLifetime = int64val
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} else {
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SessionGCMaxLifetime = 3600
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}
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In beego.Run function to add the following code:
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if SessionOn {
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GlobalSessions, _ = session.NewManager(SessionProvider, SessionName, SessionGCMaxLifetime)
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go GlobalSessions.GC()
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}
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So long SessionOn set to true, then it will open the session by default function to open an independent goroutine to handle session.
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In order to facilitate our custom Controller quickly using session, the author `beego.Controller` provides the following methods:
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func (c *Controller) StartSession() (sess session.Session) {
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sess = GlobalSessions.SessionStart(c.Ctx.ResponseWriter, c.Ctx.Request)
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return
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}
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## Session using
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Through the above code we can see, beego framework simply inherit the session function, then how to use it in your project ?
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First, we need to apply the main entrance open session:
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beego.SessionOn = true
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We can then corresponding method in the controller to use the session as follows: the
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func (this *MainController) Get() {
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var intcount int
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sess := this.StartSession()
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count := sess.Get("count")
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if count == nil {
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intcount = 0
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} else {
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intcount = count.(int)
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}
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intcount = intcount + 1
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sess.Set("count", intcount)
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this.Data["Username"] = "astaxie"
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this.Data["Email"] = "astaxie@gmail.com"
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this.Data["Count"] = intcount
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this.TplNames = "index.tpl"
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}
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The above code shows how to use the control logic session, mainly divided into two steps:
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1. Get session object
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// Get the object, similar in PHP session_start()
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sess:= this.StartSession()
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2. to use the session for general session value operation
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// Get the session values , similar in PHP $ _SESSION ["count"]
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sess.Get("count")
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// Set the session value
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sess.Set("count", intcount)
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As can be seen from the above code beego framework based applications developed using the session quite easy, basically, and PHP to call `session_start()` similar.
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## Links
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- [Directory](preface.md)
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- Previous section: [Static files](14.1.md)
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- Next section: [Form](14.3.md)
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