我正在尝试用grails/groovy编写文件和视频的上传器.因此,每次用户填写新表单时,控制器都会上传文件并将文件名和其他字段一起保存到数据库中.所以,这是保存程序:
def save = {
def streamInstance = new Stream(params)
if(request){
MultipartHttpServletRequest mpr = (MultipartHttpServletRequest)request;
CommonsMultipartFile uploadedFile = (CommonsMultipartFile)mpr.getFile("myFile");
if(!uploadedFile.empty){
println "helloworld"
println "Class: ${uploadedFile.class}"
println "Name: ${uploadedFile.name}"
println "OriginalFileName: ${uploadedFile.originalFilename}"
println "Size: ${uploadedFile.size}"
println "ContentType: ${uploadedFile.contentType}"
/*
//def webRootDir = servletContext.getRealPath("/")
//def userDir = new File(webRootDir, "/files/${session.user.login}")
//userDir.mkdirs()
uploadedFile.transferTo(new File("/Users/philipperibeiro/ctv/ctv/web-app/files"))
streamInstance.file = uploadedFile.originalFilename
*/
}
else{
flash.message = "file cannot be empty"
}
}
if(!streamInstance.hasErrors() && streamInstance.save(flush : true)){
flash.message = "${message(code: 'default.created.message', args : [message(code: 'stream.label', default:'Stream'), streamInstance.id])}"
redirect(action : "show", id : streamInstance.id)
}
else{
render(view : "create", model : [streamInstance : streamInstance])
}
}
我收到此错误:错误500:执行控制器[ctv.StreamController]的操作[save]导致异常:无法使用类'org.apache.catalina强制转换对象'org.apache.catalina.core.ApplicationHttpRequest@19f46c5d'. core.ApplicationHttpRequest'to class'org.springframework.web.multipart.MultipartHttpServletRequest'Servlet:grails URI:/ctv/grails/stream/save.dispatch异常消息:无法转换对象'org.apache.catalina.core.ApplicationHttpRequest@19f46c5d 'with class'org.apache.catalina.core.ApplicationHttpRequest'to class'org.springframework.web.multipart.MultipartHttpServletRequest'引起:无法使用类'org强制转换对象'org.apache.catalina.core.ApplicationHttpRequest@19f46c5d' .apache.catalina.core.ApplicationHttpRequest'to class'org.springframework.web.multipart.MultipartHttpServletRequest'Class:StreamController At Line:[22] Code Snippet:
有人能给出一个解决方法吗？
<%@ page import="ctv.Stream" %>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<meta name="layout" content="main" />
<g:set var="entityName" value="${message(code: 'stream.label', default: 'Stream')}" />
<title><g:message code="default.create.label" args="[entityName]" /></title>
<jqfu:resources tmpl=”false” />
</head>
<body>
<div class="nav">
<span class="menuButton"><a class="home" href="${createLink(uri: '/')}"><g:message code="default.home.label"/></a></span>
<span class="menuButton"><g:link class="list" action="list"><g:message code="default.list.label" args="[entityName]" /></g:link></span>
</div>
<div class="body">
<h1><g:message code="default.create.label" args="[entityName]" /></h1>
<g:if test="${flash.message}">
<div class="message">${flash.message}</div>
</g:if>
<g:hasErrors bean="${streamInstance}">
<div class="errors">
<g:renderErrors bean="${streamInstance}" as="list" />
</div>
</g:hasErrors>
<g:form action="save" >
<div class="dialog">
<table>
<tbody>
<tr class="prop">
<td valign="top" class="name">
<label for="district"><g:message code="stream.district.label" default="District" /></label>
</td>
<td valign="top" class="value ${hasErrors(bean: streamInstance, field: 'district', 'errors')}">
<g:select name="district.id" from="${ctv.District.list()}" optionKey="id" value="${streamInstance?.district?.id}" />
</td>
</tr>
<tr class="prop">
<td valign="top" class="name">
<label for="dateAdded"><g:message code="stream.dateAdded.label" default="Date Added" /></label>
</td>
<td valign="top" class="value ${hasErrors(bean: streamInstance, field: 'dateAdded', 'errors')}">
<g:datePicker name="dateAdded" precision="day" value="${streamInstance?.dateAdded}" />
</td>
</tr>
<tr class="prop">
<td valign="top" class="name">
<label for="name"><g:message code="stream.name.label" default="Name" /></label>
</td>
<td valign="top" class="value ${hasErrors(bean: streamInstance, field: 'name', 'errors')}">
<g:textField name="name" maxlength="30" value="${streamInstance?.name}" />
</td>
</tr>
<tr class="prop">
<td valign="top" class="name">
<label for="description"><g:message code="stream.description.label" default="Description" /></label>
</td>
<td valign="top" class="value ${hasErrors(bean: streamInstance, field: 'description', 'errors')}">
<g:textField name="description" maxlength="100" value="${streamInstance?.description}" />
</td>
</tr>
<tr class="prop">
<td valign="top" class="name">
<label for="media"><g:message code="stream.media.label" default="Media" /></label>
</td>
<td valign="top" class="value ${hasErrors(bean: streamInstance, field: 'media', 'errors')}">
<g:textField name="media" maxlength="30" value="${streamInstance?.media}" />
</td>
</tr>
<tr class="prop">
<td valign="top" class="name">
<label for="file"><g:message code="stream.file.label" default="File" /></label>
</td>
<td valign="top" class="value ${hasErrors(bean: streamInstance, field: 'file', 'errors')}">
<!--g:textField name="file" maxlength="30" value="${streamInstance?.file}" />-->
<g:form action="save" enctype="multipart/form-data">
<input type="file" name="myFile" />
</g:form>
</td>
</tr>
<tr class="prop">
<td valign="top" class="name">
<label for="logo"><g:message code="stream.logo.label" default="Logo" /></label>
</td>
<td valign="top" class="value ${hasErrors(bean: streamInstance, field: 'logo', 'errors')}">
<g:textField name="logo" value="${streamInstance?.logo}" />
</td>
</tr>
<tr class="prop">
<td valign="top" class="name">
<label for="published"><g:message code="stream.published.label" default="Published" /></label>
</td>
<td valign="top" class="value ${hasErrors(bean: streamInstance, field: 'published', 'errors')}">
<g:checkBox name="published" value="${streamInstance?.published}" />
</td>
</tr>
</tbody>
</table>
</div>
<div class="buttons">
<span class="button"><g:submitButton name="create" class="save" value="${message(code: 'default.button.create.label', default: 'Create')}" /></span>
</div>
</g:form>
</div>
</body>
</html>
错误消息的原因
您的代码的问题是您将请求对象强制转换为错误的类.这是错误消息的一部分,告诉您:
无法使用类'org.apache.catalina.core.ApplicationHttpRequest'将对象'org.apache.catalina.core.ApplicationHttpRequest@19f46c5d'转换为类'org.springframework.web.multipart.MultipartHttpServletRequest'
所以你有一个org.apache.catalina.core.ApplicationHttpRequest,你正试图把它投射到一个org.springframework.web.multipart.MultipartHttpServletRequest无法做到的.
groovy(写入grails)的美妙之处在于它是动态类型的.因此,无论如何,大部分演员都是多余的!
尝试替换这两行
MultipartHttpServletRequest mpr = (MultipartHttpServletRequest)request;
CommonsMultipartFile uploadedFile = (CommonsMultipartFile)mpr.getFile("myFile");
有了这个:
def uploadedFile = request.getFile( "myFile" )
但这不会解决你的问题!它只会改变你得到的错误信息:'(
问题的根源,我们是如何最终得到错误的请求类的？
考虑为什么你有一个错误的演员请求类型,你可能忘记包括enctype="multipart/form-data"在你的表单行动中.它应该看起来像这样:
<g:form action="save" method="post" enctype="multipart/form-data"> ... </g:form>
只是改变这个可能会解决你的问题,但我肯定会删除这个.
更新:真实的(？)答案
在HTML(和GSP用于制作HTML)中,您不能拥有嵌套表单.一种形式不能在另一种形式中.您的GSP有两种形式,第一种看起来像这样:
<g:form action="save">
第二个(内部的)看起来像这样
<g:form action="save" enctype="multipart/form-data">
所以你需要完全摆脱内部的一个,并确保外部的(唯一剩下的)看起来像这样:
<g:form action="save" method="post" enctype="multipart/form-data">
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