jfreechart 整合sturts2牛刀小试

Posted 2020-07-16

一.增加的jar包

• struts2-jfreechart-plugin-2.1.6.jar      在struts2的相应jar包中找
• jcommon-1.0.23.jar                         在jfreechart官网中找
• jfreechart-1.0.19.jar                         在jfreechart官网中找

     jfreechart 的相应jar包地址：http://pan.baidu.com/s/1gfygIob

 

相应的jsp页面：

  

<img src="${pageContext.request.contextPath}/jfreechart.action?id=<s:property value="vote.id"/>" />

相应的struts.xml配置：(需要注意的是头文件要改下从箭头中的xml中引入

<package name="jfreechart" extends="jfreechart-default" namespace="/">
        <action name="jfreechart" class="jfreeChartAction">
            <result name="success" type="chart">
                <param name="width">700</param>
                <param name="height">250</param>
            </result>
        </action>
    </package>

相应的action：

 

package action;

import java.util.List;

import jfreechart.JfreeChartService;

import org.apache.struts2.ServletActionContext;
import org.jfree.chart.JFreeChart;

import service.SelectionService;
import service.VoteService;
import vo.Selection;

import com.opensymphony.xwork2.ActionSupport;

@SuppressWarnings ( "serial" )  
public   class  JfreeCharAction  extends  ActionSupport {  
    
    /**  
     * 定 义JFreeChart对象注意在这里JFreeChart对象名只能为chart    
     * http://struts.apache.org/2.x/docs/jfreechart-plugin.html  
     */   
    private  JFreeChart chart;  
  
    public  JFreeChart getChart() {  
        return  chart;  
    }   
    public   void  setChart(JFreeChart chart) {  
        this .chart = chart;  
    }  
    
    private VoteService voteService  ;   
    private SelectionService  selectionService ;
    
    public void setVoteService(VoteService voteService) {
        this.voteService = voteService;
    }
    public void setSelectionService(SelectionService selectionService) {
        this.selectionService = selectionService;
    }

    private JfreeChartService jfreeChartService ; 
    public void setJfreeChartService(JfreeChartService jfreeChartService) {
        this.jfreeChartService = jfreeChartService;
    }
    
    private List<Selection> select_list ;
    
    @Override   
    public  String execute()  throws  Exception {  
        Integer id = Integer.valueOf(ServletActionContext.getRequest()
                .getParameter("id"));
        select_list = selectionService.find(id);
        this .chart = jfreeChartService.getChart(select_list);  
        return  SUCCESS;  
    }  
}  

 

相应的service：
   这里的注意点是很容易出现乱码，改下font就ok

 

package jfreechart;

import java.awt.Color;
import java.awt.Font;
import java.util.List;

import org.jfree.chart.ChartFactory;
import org.jfree.chart.JFreeChart;
import org.jfree.chart.axis.CategoryAxis;
import org.jfree.chart.axis.ValueAxis;
import org.jfree.chart.labels.ItemLabelAnchor;
import org.jfree.chart.labels.ItemLabelPosition;
import org.jfree.chart.labels.StandardCategoryItemLabelGenerator;
import org.jfree.chart.plot.CategoryPlot;
import org.jfree.chart.plot.PlotOrientation;
import org.jfree.chart.renderer.category.BarRenderer;
import org.jfree.data.category.DefaultCategoryDataset;
import org.jfree.ui.TextAnchor;

import vo.Selection;

public class JfreeChartService {  
       
    public  JFreeChart getChart(List<Selection> select_list){
        
        DefaultCategoryDataset dataset = new DefaultCategoryDataset();         
        for(int i = 0 ; i < select_list.size() ; i ++){
            
            dataset.addValue(select_list.get(i).getNumber(),select_list.get(i).getIndex_()+"",select_list.get(i).getContent());
        }
        JFreeChart chart = ChartFactory.createBarChart("投票结果图",  
                          "选项",  
                          "票数(个)",  
                          dataset,  
                          PlotOrientation.HORIZONTAL,  
                          false,  
                          false,  
                          false);  
                            
        CategoryPlot plot = chart.getCategoryPlot();    
        //设置网格背景颜色  
        plot.setBackgroundPaint(Color.white);  
        //设置网格竖线颜色  
        plot.setDomainGridlinePaint(Color.pink);  
        //设置网格横线颜色  
        plot.setRangeGridlinePaint(Color.pink);  
          
        //显示每个柱的数值，并修改该数值的字体属性  
        BarRenderer renderer = new BarRenderer();  
        renderer.setBaseItemLabelGenerator(new StandardCategoryItemLabelGenerator());  
        renderer.setBaseItemLabelsVisible(true);  
          
        //默认的数字显示在柱子中，通过如下两句可调整数字的显示  
        //注意：此句很关键，若无此句，那数字的显示会被覆盖，给人数字没有显示出来的问题  
        renderer.setBasePositiveItemLabelPosition(new ItemLabelPosition(ItemLabelAnchor.OUTSIDE3, TextAnchor.BASELINE_RIGHT));  
        renderer.setItemLabelAnchorOffset(20D);        
        plot.setRenderer(renderer); 
  

         //下面这段是防止出现乱码的      
        Font font = new Font("宋体", Font.ITALIC, 12);
        CategoryAxis domainAxis = plot.getDomainAxis();//(柱状图的x轴)   
        domainAxis.setTickLabelFont(font);//设置x轴坐标上的字体   
        domainAxis.setLabelFont(font);//设置x轴上的标题的字体   
        ValueAxis valueAxis = plot.getRangeAxis();//(柱状图的y轴)   
        valueAxis.setTickLabelFont(font);//设置y轴坐标上的字体   
        valueAxis.setLabelFont(font);//设置y轴坐标上的标题的字体   
        chart.getTitle().setFont(font);
        return chart ;
    }
     
}

最后效果是：