Grails为所有的控件器加方法

最新推荐文章于 2020-04-24 12:15:52 发布

原创最新推荐文章于 2020-04-24 12:15:52 发布 · 114 阅读

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文章标签：

#Grails #Groovy #Servlet #Web

本文介绍如何在Grails应用的所有控制器中动态添加transport2Map方法，该方法用于将请求参数转换为Map结构，便于处理复杂的前端传参。

如要在所有的Controller中使用transport2Map方法
在BootStarp的类如下

import org.codehaus.groovy.grails.commons.GrailsApplication
import org.codehaus.groovy.grails.web.servlet.GrailsApplicationAttributes
import org.springframework.context.ApplicationContext

class BootStrap {

def init = { servletContext ->

ApplicationContext applicationContext = servletContext.getAttribute(GrailsApplicationAttributes.APPLICATION_CONTEXT)
GrailsApplication application = (GrailsApplication) applicationContext.getBean("grailsApplication")

addDynamicMethods(applicationContext, application)

}

def destroy = {
}

def addDynamicMethods = { ApplicationContext applicationContext, GrailsApplication application ->
addDynamicControllerMethods(applicationContext, application)
}

def addDynamicControllerMethods = { ApplicationContext applicationContext, GrailsApplication application ->
application.controllerClasses.each { controllerClass ->
controllerClass.metaClass."transport2Map" = { obj -> //将页面中数组对像转成Map
Map split = obj?.inject([:]) { map, param -> //页面参数的格式如：user.1-name
List list = param.key.split('-')
if (list.size() != 2) { // only allow for 1 '-' in a param
return map
}
String firstKey = list.first()
String lastKey = list.last()
if (!map.get(firstKey)) {
map."$firstKey" = [:] // init map for this key
}
map."$firstKey"."$lastKey" = param.value
return map
}
}
}
}
}