struts2与jfeechart整合

最新推荐文章于 2022-11-21 10:08:50 发布

最新推荐文章于 2022-11-21 10:08:50 发布 · 181 阅读

文章标签：

#jfreechart #Struts #Java #JSP #UP

本文介绍了一个使用Struts框架整合JFreeChart库实现投票功能的例子。通过该示例，用户可以进行投票选择，并实时展示投票结果的柱状图。文章详细展示了vote.jsp页面代码、后端Action类实现及struts.xml配置。

下面是一个struts整合JFreeChart的投票程序
[color=red]注意：将struts-jfeechart-plugin.jar加进去[/color]
vote.jsp内容如下:


<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@ taglib uri="/struts-tags" prefix="s"%>
<html><head><title></title><head>
  <body> 
  投票项目: <br><s:form action="viewResult" namespace="/vote" method="get">
   <s:checkboxlist list="#{'football':'足球','volleyball':'排球','basketball':'篮球','badminton':'羽毛球'}" name="interests" label="请选择" labelposition="top" listKey="key" listValue="value"></s:checkboxlist>
  <br>
   <s:submit/>
   </s:form>
  </body>
</html>

action代码:

package cn.hfut.action;

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

import org.jfree.chart.ChartFactory;
import org.jfree.chart.JFreeChart;
import org.jfree.chart.axis.CategoryAxis;
import org.jfree.chart.axis.CategoryLabelPositions;
import org.jfree.chart.axis.ValueAxis;
import org.jfree.chart.plot.CategoryPlot;
import org.jfree.chart.plot.PlotOrientation;
import org.jfree.chart.title.LegendTitle;
import org.jfree.chart.title.TextTitle;
import org.jfree.data.category.DefaultCategoryDataset;

import com.opensymphony.xwork2.ActionContext;
import com.opensymphony.xwork2.ActionSupport;

public class JFreeViewAction extends ActionSupport{


	private List<String> interests;
	private JFreeChart chart;
	public JFreeChart getChart() {//注意：此处的chart名称不可改变
		chart = getJFreeChart();
		return chart;
	}
	public void setChart(JFreeChart chart) {
		this.chart = chart;
	}

	@Override
	public String execute() throws Exception {

//		System.out.println(interests);
		return SUCCESS;
	}
	@SuppressWarnings("unchecked")
	private void insertData(){
		for(String interest : interests){
			Map context = ActionContext.getContext().getApplication();
			if(context.get(interest)!=null){
				context.put(interest, (Integer)context.get(interest)+1);
			}else{
				context.put(interest,1);
			}
		}
	}
	@SuppressWarnings("unchecked")
	private JFreeChart getJFreeChart(){
		insertData();
		DefaultCategoryDataset data = new DefaultCategoryDataset();
		Map context = ActionContext.getContext().getApplication();
	/*	for(String interest : interests){
			System.out.println(context.get(interest));
		data.addValue((Integer)context.get(interest), interest , interest);
		}*/
		data.addValue((Integer)context.get("football"),"足球","足球");
		data.addValue((Integer)context.get("volleyball"),"排球","排球");
		data.addValue((Integer)context.get("basketball"),"篮球","篮球");
		data.addValue((Integer)context.get("badminton"),"羽毛球","羽毛球");
//		System.out.println(data);
		JFreeChart chart = ChartFactory.createBarChart3D("兴趣统计表", null, "结果", data, PlotOrientation.VERTICAL, true, false, false);
		LegendTitle legend  = chart.getLegend(0);
		legend.setItemFont(new Font("����隶书",Font.BOLD+Font.ITALIC,20));
		chart.setTitle(new TextTitle("兴趣统计表",new Font("宋体",Font.BOLD,20)));
		CategoryPlot plot = (CategoryPlot)chart.getPlot();
		CategoryAxis xAxis = plot.getDomainAxis();
		xAxis.setLabel("标签");
		xAxis.setLabelFont(new Font("宋体",Font.BOLD,22));
		xAxis.setTickLabelFont(new Font("宋体",Font.BOLD+Font.ITALIC,18));
		xAxis.setCategoryLabelPositions(CategoryLabelPositions.UP_45);
		ValueAxis yAxis = plot.getRangeAxis();
		yAxis.setLabelFont(new Font("宋体",Font.BOLD+Font.ITALIC,22));
		return chart;
	}
	public List<String> getInterests() {
		return interests;
	}
	public void setInterests(List<String> interests) {
		this.interests = interests;
	}
}

struts.xml配置如下:

<package name="vote" extends="jfreechart-default"
		namespace="/vote">
		<action name="viewResult"
			class="cn.hfut.action.JFreeViewAction">
			<result name="success" type="chart">
				<param name="height">600</param>
				<param name="width">800</param>
			</result>
		</action>

	</package>

运行结果:唯一柱状调查结果表