Grails JFreeChart 无法解析 class：org.jfree.chart.ChartFactory

Question

我正在运行使用 JFreeChart 库和 Groovy/Grails 后端绘制折线图的程序。这是我的代码：

    package com.xyz.jfreechartdemo

    import org.jfree.chart.ChartFactory
    import org.jfree.chart.JFreeChart
    import org.jfree.chart.plot.PlotOrientation
    import org.jfree.data.category.DefaultCategoryDataset

    class JFreeChartSample {
      def getChart(){
      def dataset = createDataset()
      def chart = createChart(dataset)
      return chart
    }

    def createDataset() {
       DefaultCategoryDataset dataset = new DefaultCategoryDataset()
      dataset.addValue(2000,"X",1)
      dataset.addValue(3300,"X",2)
      dataset.addValue(2000,"X",3)
      dataset.addValue(3300,"X",4)
      return dataset
    }

   def createChart(dataset){
    JFreeChart chart = ChartFactory.createLineChart("Widget not rendered","X","Count",dataset,PlotOrientation.VERTICAL,false,true,false)
    return chart
  }
}

我正在研究 IntelliJ Idea 13.1.3。编译成功。但这是我在运行程序时看到的：

Compilation error: startup failed:
C:\Users\User\IdeaProjects\JFreeChartDemo\grails app\domain\com\xyz\jfreechartdemo\JFreeChartSample.groovy: 3: unable to resolve class org.jfree.chart.ChartFactory
 @ line 3, column 1.
   import org.jfree.chart.ChartFactory
   ^

C:\Users\User\IdeaProjects\JFreeChartDemo\grails-app\domain\com\xyz\jfreechartdemo\JFreeChartSample.groovy: 6: unable to resolve class org.jfree.data.category.DefaultCategoryDataset
 @ line 6, column 1.
   import org.jfree.data.category.DefaultCategoryDataset
    ^

C:\Users\User\IdeaProjects\JFreeChartDemo\grails-app\domain\com\xyz\jfreechartdemo\JFreeChartSample.groovy: 5: unable to resolve class org.jfree.chart.plot.PlotOrientation
 @ line 5, column 1.
   import org.jfree.chart.plot.PlotOrientation
  ^

C:\Users\User\IdeaProjects\JFreeChartDemo\grails-app\domain\com\xyz\jfreechartdemo\JFreeChartSample.groovy: 4: unable to resolve class org.jfree.chart.JFreeChart
 @ line 4, column 1.
   import org.jfree.chart.JFreeChart
   ^

4 errors

我已将 JCommon 和所有 JFreeChart 库复制到 lib 文件夹中。而且我仍然看到这个错误。请帮忙。我是 Groovy 和 Grails 的新手。

Answer 1

添加代码的步骤：

添加您的 jar 依赖项，它将在 BuildConfig.groovy 中下载它（您需要通过网络在线搜索您的 jar 版本来找到如何使用 maven 存储库下载它） http://mvnrepository.com/artifact/jfree/jfreechart
运行 "grails clean"
运行 "grails refresh-dependencies"

Grails JFreeChart 无法解析 class：org.jfree.chart.ChartFactory

Grails JFreeChart unable to resolve class: org.jfree.chart.ChartFactory

import

grails

groovy

jfreechart