Question

我无法使基本的primefaces饼图工作。即时通讯使用primefaces 4.0，eclipse kepler和glassfish 4.0 我得到的错误是：

java.lang.ClassCastException: java.lang.String cannot be cast to org.primefaces.model.chart.PieChartModel

XHTML：

<p:pieChart value="chart.model" legendPosition="w" />

爪哇：

package server;

import org.primefaces.model.chart.PieChartModel;
import javax.annotation.PostConstruct;
import java.io.Serializable;
import javax.faces.bean.ManagedBean;

public class Chart  implements Serializable
{

    private static final long serialVersionUID = 1L;

    private PieChartModel model;
    public Chart()
    {
        model = new PieChartModel();
        model.set("Brand1", 540);
        model.set("Brand2", 325);
        model.set("Brand3", 702);
        model.set("Brand4", 421);       
    }
    public PieChartModel getModel()
    {
        return model;
    }
}

任何想法我做错了什么？感谢

Answer 1

您的错误来自：

<p:pieChart value="chart.model" legendPosition="w" />

您的价值应为：value="#{chartBean.chart.model}"

其中chartBean是带注释的ManagedBean。

@ManagedBean(name="chartBean")
@YOURSCOPE (might be Request, Session etc...)
public class ChartBean implements Serializable{
  Chart chart;

  //you should initialize your bean in the constructor, or somewhere in the class, like
  public ChartBean(){
    ...
    Chart = new Chart();
    ...
  }

  public Chart getChart(){
    return this.chart;
  }
}

PrimeFaces PieChart无法正常工作

1 个答案: