grails - 带有Grails的Spring Security Service-获取当前用户 'NULL'错误

Question

嗨，我正在尝试使用Grails的Spring Security Core，并尝试获取当前登录的用户。但是，我得到了java.lang.NullPointerException，它是由以下原因引起的:无法在空对象上获取属性“principal”。

以下是我的代码:

import static org.springframework.http.HttpStatus.*
import grails.transaction.Transactional
import grails.plugin.springsecurity.annotation.Secured

@Secured(['ROLE_ADMIN'])
@Transactional
class MyController {

    static allowedMethods = [save: "POST", update: "PUT", delete: 
                            "DELETE"]

    def test(){
         def springSecurityService
         render "Current User is: [" + springSecurityService.principal  
                                  + "]"
         }
    }

由于某些原因，springSecurityService为null。我错过了什么？

请指教。先感谢您!

Answer 1

正如约书亚·摩尔(Joshua Moore)所建议的那样，此方法有效!非常感谢!

import static org.springframework.http.HttpStatus.*
import grails.transaction.Transactional
import grails.plugin.springsecurity.annotation.Secured

@Secured(['ROLE_ADMIN'])
@Transactional
class MyController {

    static allowedMethods = [save: "POST", update: "PUT", delete: "DELETE"]

    def springSecurityService

    def test(){



        render "Current User is: [" + springSecurityService.principal  + "]"


    }

}