grails - Grails渲染插件保存到文件

Question

显示 Controller 生成PDF的 Action 时，我正在尝试使用渲染插件将生成的pdf保存到文件中。我正在按照以下说明进行操作:http://gpc.github.com/grails-rendering/docs/manual/index.html

def pdf = {
        def project = Project.get(params.id)
        def numGoodMilestones = queryService.getGoodShapeMilestonesCount(project)
        def totalMilestones = project.milestones.size()
        def updateHistory = queryService.getReadableHistory(project)
        def summaryName = "${project.name.replace(" ","_")}_summary_${String.format('%tF', new Date()).replace(" ","_")}"
        if(!project)
        {
            flash.message = g.message(code:'default.not.found.message',
                args:[message(code:'project.label',default:'Project'),params.id])
            redirect(uri:'/')
        }
        // see if a summary has been generated with this data and attached to the
        // project. If not, do it.
        def existingAttachedSummary = ProjectDocument.findByName(summaryName)
        if(!existingAttachedSummary)
        {
            //make the file
            def savedSummary = new File(summaryName).withOutputStream { outputStream ->
                pdfRenderingService.render( controller:this,
                template: "projectDetail",
                model:[project:project,
                      numGoodMilestones:numGoodMilestones,
                      totalMilestones:totalMilestones,
                      updateHistory: updateHistory])
            }
            def projectDocument = new ProjectDocument(name:summaryName,
                                  description:"Project summary automatically generated on ${new Date()}}",
                                  fileData:savedSummary,
                                  owner: springSecurityService.currentUser,
                                  project:project
                              )
            if(projectDocument.validate())
            {
                projectDocument.save(flush:true)
                flash.message="I saved a document, yo. ${projectDocument}."
            }
            else
            {
                flash.message="Errors, yo. ${projectDocument.errors.allErrors.each{ it }}."
            }
        }
        else
        {
            flash.message = "project summary already attached to project"
        }

        renderPdf(template: "projectDetail",
        model:[project:project, numGoodMilestones:numGoodMilestones, totalMilestones:totalMilestones, updateHistory: updateHistory],
        filename: "${summaryName}.pdf")
    }

renderPdf()方法工作正常，因为浏览器中的输出符合预期。但是，当我查看创建的ProjectDocument时，会看到一个空白的PDF文件。我试图以与渲染文档所述完全相同的方式保存到文件。我究竟做错了什么？

Answer 1

我认为这是文档中的错误。将outputStream作为最后一个参数传递给pdfRenderingService.render。

def savedSummary = new File(summaryName).withOutputStream { outputStream ->
    pdfRenderingService.render( controller:this,
        template: "projectDetail",
        model:[project:project,
              numGoodMilestones:numGoodMilestones,
              totalMilestones:totalMilestones,
              updateHistory: updateHistory],
        outputStream)  // <- added this parameter
}