如何使用grails将文件上传到服务器目录？

Question

如何将文件上传到服务器目录.. 如果我在 D:\myapp 的项目并且我使用 cmd d:\myapp grails run-app 运行 当我运行这个应用程序和其他计算机运行它并上传文件..它将ini计算机服务器保存在目录D：\ myapp \upload？

我试试这个 ini gsp。

<g:form action="list" enctype="multipart/form-data" useToken="true">
    <span class="button">
        <input type="file" name="filecsv"/>
        <input type="button" class="upload" value="Upload"
               onclick='location.href = "${createLink(url: [action: 'upload'])}"'/>
    </span>
</g:form>

def upload = {

    def f = request.getFile('filecsv')
    if (f.empty) {
        flash.message = 'file cannot be empty'
        render(view: 'list')
        return
    }

    f.transferTo(new File('C:\Users\meta\Documents\workspace-sts-2.5.2.RELEASE\wawet\wallet\uploads\file_name.csv'))
    response.sendError(200, 'Done')
}

这是错误：

2014-02-03 10:43:02,706 [http-8080-2] ERROR errors.GrailsExceptionResolver  - No signature of method: org.springframework.security.web.servletapi.SecurityContextHolderAwareRequestWrapper.getFile() is applicable for argument types: (java.lang.String) values: [filecsv]
Possible solutions: getXML(), getAt(java.lang.String), getAt(java.lang.String), getLocale(), getJSON(), getHeader(java.lang.String)
groovy.lang.MissingMethodException: No signature of method: org.springframework.security.web.servletapi.SecurityContextHolderAwareRequestWrapper.getFile() is applicable for argument types: (java.lang.String) values: [filecsv]
Possible solutions: getXML(), getAt(java.lang.String), getAt(java.lang.String), getLocale(), getJSON(), getHeader(java.lang.String)
        at com.teravin.wallet.LoanAccountController$_closure12.doCall(com.teravin.wallet.LoanAccountController:308)
        at com.teravin.wallet.LoanAccountController$_closure12.doCall(com.teravin.wallet.LoanAccountController)
        at java.lang.Thread.run(Thread.java:744)

Answer 1

目标只是Java中的文件。

def f = request.getFile('some_file')

//validate file or do something crazy hehehe

//now transfer file
File fileDest = new File("Path to some destination and file name")
f.transferTo(fileDest)

或如果您想将其存储在相对于用户主目录的某个路径：

def homeDir = new File(System.getProperty("user.home")) //user home e.g /home/username for unix
File fileDest = new File(homeDir,"path/to/some_folder")
f.transferTo(fileDest)

更新 根据您的getFile 不起作用的原因，您没有提交表单：

<g:form action="list" enctype="multipart/form-data" useToken="true">

<span class="button">                   
                    <input type="file" name="filecsv"/>
                    <input type="button" class="upload"
                                        value="Upload"
                                        onclick='location.href = "${createLink(url: [action: 'upload'])}"'/>

            </span>

</g:form>

应该是：

<g:form action="upload" enctype="multipart/form-data" useToken="true">

<span class="button">                   
                    <input type="file" name="filecsv"/>
                    <input type="submit" class="upload" value="upload"/>

            </span>

</g:form>

如果您需要使用 javascript，您应该提交表单而不是添加到另一个页面的链接。

Answer 2

Grails 应用程序的位置无关紧要。您必须在控制器中指定完整的目标路径。这是一个例子

def upload() {
    def f = request.getFile('filecsv')
    if (f.empty) {
        flash.message = 'file cannot be empty'
        render(view: 'uploadForm')
        return
    }

    f.transferTo(new File('D:\myapp\upload\file_name.txt')) 
    response.sendError(200, 'Done') 
}

Answer 3

最终字符串 IMAGE_DIR = "${servletContext.getRealPath('/images')}/";

    def employeeId = "dablu_photo";

    def employeePicture = request.getFile("cv_");

    String photoUrl  ="";
    if (employeePicture && !employeePicture.empty) {
        if (new java.io.File(IMAGE_DIR+"/employee_photo/"+employeeId+".png")?.exists()){
            FileUtils.deleteQuietly(new java.io.File(IMAGE_DIR+"/employee_photo/"+employeeId+".png"));
        }
        employeePicture.transferTo(new java.io.File(IMAGE_DIR+"/employee_photo/"+employeeId+".png"))

    }