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2011-08 ( 6)
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jfreechart整合struts2入门之一2011-01-13 07:51 P.M. 报表，大家都很熟悉吧，如何做一个动态报表，下面这个简单例子让你体会到jfreechart的强大.

代码：
jfree.jsp页面代码如下:

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
    <base href="<%=basePath%>">

    <title>jfree.jsp</title>
    <meta http-equiv="pragma" content="no-cache">
    <meta http-equiv="cache-control" content="no-cache">
    <script type="text/javascript" src="jslib/jfree.js"></script>
</head>

<body>
      <div>
         <font size="3" color="red" style="margin-left: 100px;">请选择季度</font>
          <select name="selected" id="selected"   onchange="jfree()">
              <option value="1">第一季度</option>
              <option value="2">第二季度</option>
              <option value="3">第三季度</option>
          </select>
      </div>
      <br>
      <div>
        <img id="imgs" src="listAction.action"/>
      </div>
</body>
</html>
jfree.js代码如下:
function jfree(){
    var month = document.getElementById("selected").value;
    document.getElementById("imgs").src ="listAction.action?month="+month;
}

JfreeAction.java代码如下：
package jfree.action;

import java.awt.Color;
import java.io.IOException;
import java.util.List;
import java.util.Map;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpSession;

import org.apache.struts2.dispatcher.SessionMap;
import org.apache.struts2.interceptor.ServletRequestAware;
import org.apache.struts2.interceptor.SessionAware;
import org.jfree.chart.ChartFactory;
import org.jfree.chart.JFreeChart;
import org.jfree.chart.axis.AxisLocation;
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.BarRenderer3D;
import org.jfree.chart.servlet.ServletUtilities;
import org.jfree.data.category.CategoryDataset;
import org.jfree.data.general.DatasetUtilities;
import org.jfree.ui.TextAnchor;

import jfree.dao.JFreeModelDao;
import jfree.dao.JFreeModelDaoImpl;
import jfree.model.JfreeModel;

import com.opensymphony.xwork2.ActionSupport;

public class JfreeAction extends ActionSupport implements ServletRequestAware{

    /**
     *
     */
    private static final long serialVersionUID = -1211545339874371458L;
    private static JFreeModelDao dao = new JFreeModelDaoImpl();
    private HttpServletRequest request;
    private JFreeChart chart;

    public JFreeChart getChart() {
        return chart;
    }
    public void setChart(JFreeChart chart) {
        this.chart = chart;
    }
    @Override
    public String execute() throws Exception {
        return super.execute();
    }
    public String dawPic() throws IOException{
        String month = request.getParameter("month");
        if(month==null){
            month = "1";
        }
        this.chart = getChart(month);
        return SUCCESS;
    }
    public void setServletRequest(HttpServletRequest request) {
        this.request = request;

    }
    public JFreeChart getChart(String month){
        List<JfreeModel> list =dao.getModel(month);
        double[][] data = new double[4][4];
        for(int i=0;i<list.size();i++){
            JfreeModel jm = list.get(i);
            data[i][0] = jm.getNoteNum();
            data[i][1] = jm.getMobileNum();
            data[i][2] = jm.getComputerNum();
            data[i][3] = jm.getCameraNum();
        }
        String[] rowKeys = {"笔记本","手机","电脑","数码相机"};
          String[] columnKeys = {"北京", "上海", "广州", "深圳"};
          CategoryDataset dataset = DatasetUtilities.createCategoryDataset(rowKeys,columnKeys,data);
          JFreeChart chart = ChartFactory.createBarChart3D("四大城市第"+month+"季度销售统计图 ",
                                      "IT产品",
                                      "销量",
                                      dataset,
                                      PlotOrientation.VERTICAL,
                                      true,
                                      true,
                                      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

        BarRenderer3D renderer = new BarRenderer3D();
        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.OUTSIDE12, TextAnchor.BASELINE_LEFT));
        renderer.setItemLabelAnchorOffset(10D);
        //设置每个地区所包含的平行柱的之间距离
        //renderer.setItemMargin(0.3);
        plot.setRenderer(renderer);
        //设置地区、销量的显示位置
        plot.setDomainAxisLocation(AxisLocation.BOTTOM_OR_LEFT);
        plot.setRangeAxisLocation(AxisLocation.BOTTOM_OR_LEFT);
        return chart;
    }
}

Struts.xml配置如下:
<package name="jfree" extends="jfreechart-default">
        <action name="listAction" class="jfree.action.JfreeAction" method="dawPic">
            <result name="success" type="chart">
                <param name="width">500</param>
                <param name="height">300</param>
            </result>
        </action>
    </package>

Model层
JfreeModel.java代码如下:
package jfree.model;
public class JfreeModel {
    private int id;
    private double noteNum;     //笔记本销售量
    private double cameraNum;   //数码相机销售量
    private double computerNum; //电脑销售量
    private double mobileNum;   //手机销售量
    private int month;       //月份
......//getters setters
}

DAO层
接口JFreeModelDao代码 :
package jfree.dao;

import java.util.List;

import jfree.model.JfreeModel;

public interface JFreeModelDao {
    public List<JfreeModel> getModel(String month);

}
实现类JFreeModelDaoImpl.java代码如下:
package jfree.dao;

import java.util.List;

import org.hibernate.HibernateException;
import org.hibernate.Session;
import org.jfree.util.UtilHibernate;

import jfree.model.JfreeModel;

public class JFreeModelDaoImpl implements JFreeModelDao {

    @SuppressWarnings("unchecked")
    public List<JfreeModel> getModel(String month) {
        Session session = UtilHibernate.getSession();
        List<JfreeModel> list = null;
        try {
            session.beginTransaction();
            String sql = "from JfreeModel where month="+"'"+month+"'";
            list = session.createQuery(sql).list();
            session.getTransaction().commit();
        } catch (HibernateException e) {
            session.getTransaction().rollback();
            e.printStackTrace();
        }finally{
            UtilHibernate.closeSession(session);
        }
        return list;
    }
}

service层暂时不用

注意事项：

(1)导入struts2-jfreechart-plugin-2.1.8.1.jar包
(2)action配置是要注意继承jfreechart-default
.......................................................ok!!!

该事例有空会做进一步的开发

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cas安装

2011-08-26 11:07
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