Grails 在 Service 类中获取会话和管理 [英] Grails get Session and Management in Service class
问题描述
我在使用 Grails 会话时遇到问题.我正在考虑为我的会话处理设置一个服务类.所以我创建了一个名为SessionService"的类(在 grails-app/services/grails/下).
I have a problem with Grails Session. I was thinking about having a Service Class for my session handling. So I created a class called "SessionService" (under grails-app/services/grails/).
class SessionService {
static transactional = true
GrailsWebRequest request = RequestContextHolder.currentRequestAttributes()
GrailsHttpSession session = request.session
def setTestvar(String value) {
if (session != null)
session.setAttribute("sTeststring", value)
}
def getTestvar() {
if (session != null)
session.getAttribute("sTeststring")
}
}
现在的问题是,我得到一个空指针异常:方法抛出了'java.lang.NullPointerException'异常.无法评估 org.codehaus.groovy.grails.web.servlet.mvc.GrailsHttpSession.ToString()".
The Problem is now, that I get a Nullpointer-Exception: "Method threw 'java.lang.NullPointerException' exception. Cannot evaluate org.codehaus.groovy.grails.web.servlet.mvc.GrailsHttpSession.ToString()".
我的服务类的使用,例如在控制器中:
Usage of my Service Class e.g. in a Controller:
class SampleController {
SessionService sessionService
def selectAnything = {
sessionService.setTestvar("test-value")
render(view: "testview")
}
}
我在这里做错了什么?这是正确的方法吗?还是我必须在每种方法中都设置session = request.session"?
What am I'm doing wrong here? Is it the right way? Or do I have to set "session = request.session" in every method?
希望得到您的帮助.
非常感谢您.
干杯,
马可
推荐答案
RequestContextHolder 从何而来?它在 grails 3.3.8 中不可见(至少在插件中)
where does RequestContextHolder come from? Its not visible in grails 3.3.8 (in plugin at least)
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