Question

我在项目目录中有每个用户的图像，如user1.jpeg，user2.jpeg等。但是当我尝试更改用户图像时，它正在经历一个错误。我不明白该怎么做。以下是错误＆gt;＆gt;＆gt;

Cannot cast object 'org.apache.catalina.core.ApplicationHttpRequest@21740230' with class 'org.apache.catalina.core.ApplicationHttpRequest' to class 'org.springframework.web.multipart.MultipartHttpServletRequest'

这是我的更新操作＆gt;＆gt;＆gt;

def updateUser = {
    String message = ""
    MultipartHttpServletRequest mpr = (MultipartHttpServletRequest)request;
    CommonsMultipartFile f = (CommonsMultipartFile) mpr.getFile("userPhoto")//getFile("userPhoto");

    if(!f.empty) {
        def user = User.get(1)
        user.avatarType = f.getContentType()
        if(user.save()){
            def userId = user.id
            String username = user.username
            println(userId)
            String fileName = username + "." + f.getContentType().substring(6)
            new File( grailsApplication.config.images.location.toString() ).mkdirs()
            f.transferTo( new File( grailsApplication.config.images.location.toString() + File.separatorChar + fileName) )
            message = "Here is your updated Information >>>  "
            render(view: 'userInfo', model: [message: message],)

        }else{
            message = "Can not Update User !!!"
            render(view: 'editUser', model:[message: message])
            return;
        }
    }else {
        flash.message = 'file cannot be empty'
    }
}

有人可以帮我吗？我使用的是grails 2.1.0。

编辑::

以下是编辑用户＆gt;＆gt;＆gt;

的视图

<div class="main">
   <g:form controller="user" action="updateUser">
       User Name : ${username} <br/>
       Photo : <input type="file" name="userPhoto" /> <p></p>
       <g:hiddenField name="userId" id="userId" value="${userId}"/>
       <g:submitButton name="updateUser" value="Update" />
   </g:form>

Answer 1

 // MultipartHttpServletRequest mpr = (MultipartHttpServletRequest)request;
 def f = request.getFile("userPhoto")//getFile("userPhoto");

我必须使用<g:uploadForm />查看http://grails.org/doc/latest/guide/theWebLayer.html#uploadingFiles

Answer 2

您的代码中的一切都很好，只需在表单标记中添加enctype="multipart/form-data"，例如

<g:form controller="user" action="updateUser" enctype="multipart/form-data">
    ...
</g:form>

并且您的代码有效。

更新grails目录中的用户映像

2 个答案: