dri*_*ieu 6 grails grails-plugin
我在使用渲染插件时遇到一些问题.它总是返回一个空指针异常.我看到了严重的类似问题,但我没有找到我错在哪里.
我的模板代码:/views/appRetail/_report.gsp
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org /TR/xhtml1/DTD/xhtml1-strict.dtd">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta name="description" content="">
<meta name="author" content="">
<title>Welcome to Production !</title>
</head>
<html>
<body>
REPORT
</body>
</html>
我的控制器代码:
class AppRetailController {
def pdfRenderingService
def renderFormPDF() {
def apps = App.findAll()
new File("test.pdf").withOutputStream { outputStream ->
pdfRenderingService.render(template: '/appRetail/report', model: [apps:apps], outputStream)
}
}
}
这是堆栈跟踪:
2015-04-17 10:31:54,552 [http-bio-8080-exec-4] ERROR errors.GrailsExceptionResolver - NullPointerException occurred when processing request: [POST] /toolprod/appRetail/renderFormPDF
Stacktrace follows:
Message: null
Line | Method
->> 1281 | getPublicDeclaredMethods in java.beans.Introspector
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
| 1141 | getTargetMethodInfo in ''
| 416 | getBeanInfo . . . . . . in ''
| 163 | getBeanInfo in ''
| 31 | init . . . . . . . . . . in grails.plugin.rendering.document.RenderEnvironment
| 68 | with in ''
| 60 | with . . . . . . . . . . in ''
| 65 | generateXhtml in grails.plugin.rendering.document.XhtmlDocumentService
| 35 | createDocument . . . . . in ''
| 36 | render in grails.plugin.rendering.RenderingService
| 348 | doCall . . . . . . . . . in toolprod.AppRetailController$_renderFormPDF_closure1
| 347 | renderFormPDF in toolprod.AppRetailController
| 198 | doFilter . . . . . . . . in grails.plugin.cache.web.filter.PageFragmentCachingFilter
| 63 | doFilter in grails.plugin.cache.web.filter.AbstractFilter
| 82 | doFilterInternal . . . . in com.linkedin.grails.profiler.ProfilerFilter
| 1145 | runWorker in java.util.concurrent.ThreadPoolExecutor
| 615 | run . . . . . . . . . . in java.util.concurrent.ThreadPoolExecutor$Worker
^ 744 | run in java.lang.Thread
这是我使用的版本:
您需要在buildConfig文件中添加此依赖项:
dependencies {
runtime 'org.springframework:spring-test:4.1.6.RELEASE'
}
从堆栈跟踪来看，闭包似乎withOutputStream引起了一些混乱，但它在测试应用程序中对我有用。尝试运行grails clean并grails compile重新运行该应用程序。如果这不能解决问题，请删除目标目录并运行 clean 并再次编译。
如果问题仍然存在，可以使用几种不同的方法来生成 PDF。您可以获取生成的数组并自己编写，而不是将其传递OutputStream给 iText 来渲染 PDF ，例如byte[]
def renderFormPDF() {
def apps = App.findAll()
ByteArrayOutputStream baos = pdfRenderingService.render(template: '/appRetail/report', model: [apps: apps])
new File('test.pdf').withOutputStream { it.write baos.toByteArray() }
}
或者
def renderFormPDF() {
def apps = App.findAll()
ByteArrayOutputStream baos = pdfRenderingService.render(template: '/appRetail/report', model: [apps: apps])
new File('test.pdf') << baos.toByteArray()
}
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