JFreeChart 案例1

JFreeChart 是一个非常流行的一个免费开源的图表软件
已经有11年以上的历史

首先要下载jar包
www.jfree.org

在http://www.jfree.org/jfreechart 下点击Project Page at SourceForge 去下载
要下载JFreeChart 与JCommon

做JFreeChart的时候，一般是以下三步
1：要有数据 比如DefaultPieDataset
2：根据数据生成 JFreeChart 对象
3：显示JFreeChart对象（显示在swing中或生成一个图片在jsp中显示）

下面看一个例子：

主要是用JFreeChart做的饼图和柱状图，用到了struts2

1.Action类（一个处理部门的饼图，一个地市柱形图）：

public class DeptPieChartAction extends ActionSupport {/** * Comment for <code>serialVersionUID</code> */private static final long serialVersionUID = 1L;private JFreeChart chart;  private Date startTime;private String startTimeStr;         @Override      public String execute() throws Exception {      if(startTime != null){    SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM");        startTimeStr = sdf.format(startTime);        startTimeStr = startTimeStr + "-01 00:00:00";    }    TJByChart tc = new TJByChart();        chart = tc.createDeptPieChart(startTimeStr);        return SUCCESS;      }            public JFreeChart getChart() {          return chart;      }public void setChart(JFreeChart chart) {this.chart = chart;}public Date getStartTime() {return startTime;}public void setStartTime(Date startTime) {this.startTime = startTime;}public String getStartTimeStr() {return startTimeStr;}public void setStartTimeStr(String startTimeStr) {this.startTimeStr = startTimeStr;}  }

public class RNumBarChartAction extends ActionSupport {/** * Comment for <code>serialVersionUID</code> */private static final long serialVersionUID = 1L;private JFreeChart chart;           @Override      public String execute() throws Exception {      TJByChart tc = new TJByChart();        chart = tc.createReceiveCaseBarChart();        return SUCCESS;      }            public JFreeChart getChart() {          return chart;      }public void setChart(JFreeChart chart) {this.chart = chart;}  }

2.service 类：

import java.awt.Font;import java.sql.Connection;import java.sql.ResultSet;import java.sql.SQLException;import java.sql.Statement;import java.text.DecimalFormat;import java.text.SimpleDateFormat;import java.util.Calendar;import java.util.Iterator;import java.util.LinkedHashMap;import java.util.Map;import org.apache.struts2.ServletActionContext;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.labels.StandardPieSectionLabelGenerator;import org.jfree.chart.plot.CategoryPlot;import org.jfree.chart.plot.PiePlot;import org.jfree.chart.plot.PlotOrientation;import org.jfree.chart.renderer.category.BarRenderer3D;import org.jfree.data.category.CategoryDataset;import org.jfree.data.category.DefaultCategoryDataset;import org.jfree.data.general.DefaultPieDataset;import org.jfree.data.general.PieDataset;import org.jfree.data.jdbc.JDBCPieDataset;import com.metarnet.cssf.common.PropertiesParser;import com.metarnet.cssf.common.UserManager;import com.metarnet.cssf.common.db.ConnectionPool;import com.metarnet.cssf.model.User;/* * 图形统计表-统计概览  * */public class TJByChart {private User user = UserManager.getInstance().getUserBySessionId(ServletActionContext.getRequest().getRequestedSessionId());//接单/驳单统计public JFreeChart createReceiveCaseBarChart(){CategoryDataset dataset = initReceiveCaseBarDate();  Calendar cal = Calendar.getInstance();cal.add(Calendar.MONTH, -1);String name = cal.get(Calendar.YEAR) + "年" + (cal.get(Calendar.MONTH) + 1) + "月";        JFreeChart chart = ChartFactory.createBarChart3D(                  name + "处理/驳回统计", // 图表标题                  "地市",                 "数量",                   dataset, // 数据集                  PlotOrientation.VERTICAL, // 图表方向：水平、垂直                  true,   // 是否显示图例(对于简单的柱状图必须是false)                  true,   // 是否生成工具                  true    // 是否生成URL链接                  );                  chart.getTitle().setFont(new Font("隶书",Font.BOLD,18));chart.getLegend().setItemFont(new Font("宋体",Font.BOLD, 14));chart.setBorderVisible(true);CategoryPlot plot = chart.getCategoryPlot();plot.setForegroundAlpha(0.8F);plot.setBackgroundAlpha(0.5F);CategoryAxis categoryAxis = plot.getDomainAxis();categoryAxis.setLabelFont(new Font("宋体", Font.PLAIN, 12));categoryAxis.setTickLabelFont(new Font("宋体", Font.PLAIN, 12));categoryAxis.setCategoryLabelPositions(CategoryLabelPositions.UP_45);ValueAxis valueAxis = plot.getRangeAxis();valueAxis.setLabelFont(new Font("宋体", Font.PLAIN, 12));BarRenderer3D renderer = new BarRenderer3D();renderer.setItemMargin(0.32);plot.setRenderer(renderer);        return chart;  }private CategoryDataset initReceiveCaseBarDate(){DefaultCategoryDataset dataSet = new DefaultCategoryDataset();Connection conn = null;Statement stat = null;ResultSet rs = null;try {String sql = "select city_id,city_name,isreject,count(*) as cnum from cssf_ts_statistics where 1 = 1 ";if(user.getCityId() > 0){//省份sql = sql + " and city_id = " + user.getCityId();}//时间Calendar cal = Calendar.getInstance();cal.add(Calendar.MONTH, -1);cal.set(Calendar.DAY_OF_MONTH, 1);cal.set(Calendar.HOUR_OF_DAY, 0);cal.set(Calendar.MINUTE, 0);cal.set(Calendar.SECOND, 0);SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");String start = sdf.format(cal.getTime());cal.add(Calendar.MONTH, 1);String end = sdf.format(cal.getTime());sql = sql + " and sponsor_time >= to_date('" + start + "','yyyy-mm-dd hh24:mi:ss') and sponsor_time < to_date('"+ end + "','yyyy-mm-dd hh24:mi:ss') group by city_id,city_name,isreject order by city_id";conn = ConnectionPool.getInstance().getConnection("cssf");stat = conn.createStatement();rs = stat.executeQuery(sql);Map<String, int[]> retMap = new LinkedHashMap<String, int[]>();while(rs.next()){String cityname = rs.getString("city_name");int cityId = rs.getInt("city_id");int isreject = rs.getInt("isreject");int num = rs.getInt("cnum");if(retMap.containsKey(cityname)){int[] arr = retMap.get(cityname);if(isreject == 1){arr[1] = num;}else{arr[0] = num;}arr[2] = cityId;}else{int[] arr = new int[3];if(isreject == 1){arr[1] = num;}else{arr[0] = num;}arr[2] = cityId;retMap.put(cityname, arr);}}Iterator<String> iter = retMap.keySet().iterator();while(iter.hasNext()){String cityName = iter.next();int[] arr = retMap.get(cityName);dataSet.addValue(arr[0], "处理", cityName);dataSet.addValue(arr[1], "驳回", cityName);}} catch (Exception e) {// TODO Auto-generated catch blocke.printStackTrace();} finally {try { rs.close(); } catch (Exception e) { }try { stat.close(); } catch (Exception e) { }try { conn.close(); } catch (Exception e) { }}return dataSet;}//创建处理部门统计饼图public JFreeChart createDeptPieChart(String startTime){Calendar cal = Calendar.getInstance();cal.add(Calendar.MONTH, -1);String name = cal.get(Calendar.YEAR) + "年" + (cal.get(Calendar.MONTH) + 1) + "月";JFreeChart chart = ChartFactory.createPieChart3D(name + "投诉处理部门统计图", initDeptPieData(), true, true, false);chart.getTitle().setFont(new Font("隶书",Font.BOLD,18));chart.getLegend().setItemFont(new Font("宋体",Font.BOLD, 14));chart.setBorderVisible(true);PiePlot plot = (PiePlot) chart.getPlot();plot.setForegroundAlpha(0.5f);plot.setLabelFont(new Font("宋体", Font.PLAIN, 12));plot.setCircular(true);//设置分类标签的格式plot.setLabelGenerator(new StandardPieSectionLabelGenerator("{2}",new DecimalFormat("0.00%"),new DecimalFormat("0.00%")));return chart;}//加载处理部门统计数据private PieDataset initDeptPieData(){JDBCPieDataset dataset = null;PropertiesParser prop = new PropertiesParser();try {dataset = new JDBCPieDataset(prop.getProperty("cssf.url"),prop.getProperty("cssf.driver"),prop.getProperty("cssf.user"),prop.getProperty("cssf.password"));//select duty_dept,count(*) from cssf_ts_statistics group by duty_deptString sql = "select duty_dept,count(*) from cssf_ts_statistics where 1 = 1 and duty_dept is not null";if(user.getCityId() > 0){//省份sql = sql + " and city_id = " + user.getCityId();}//时间Calendar cal = Calendar.getInstance();cal.add(Calendar.MONTH, -1);cal.set(Calendar.DAY_OF_MONTH, 1);cal.set(Calendar.HOUR_OF_DAY, 0);cal.set(Calendar.MINUTE, 0);cal.set(Calendar.SECOND, 0);SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");String start = sdf.format(cal.getTime());cal.add(Calendar.MONTH, 1);String end = sdf.format(cal.getTime());sql = sql + " and sponsor_time >= to_date('" + start + "','yyyy-mm-dd hh24:mi:ss') and sponsor_time < to_date('"+ end + "','yyyy-mm-dd hh24:mi:ss') group by duty_dept";System.out.println("dept: " + sql);dataset.executeQuery(sql);} catch (SQLException e) {// TODO Auto-generated catch blocke.printStackTrace();} catch (ClassNotFoundException e) {// TODO Auto-generated catch blocke.printStackTrace();} finally {if(dataset != null) dataset.close();}return dataset;}}

3.struts.xml

<?xml version="1.0" encoding="UTF-8" ?><!DOCTYPE struts PUBLIC    "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"    "http://struts.apache.org/dtds/struts-2.0.dtd"><struts><package name="jFreeChartPkg" extends="struts-default" namespace="/jfcpkg"><result-types><result-type name="chart"class="org.apache.struts2.dispatcher.ChartResult"></result-type></result-types><action name="deptPieChart" class="com.metarnet.cssf.action.report.common.complaint.DeptPieChartAction"><result type="chart"><param name="width">330</param><param name="height">200</param></result></action><action name="rnumBarChart" class="com.metarnet.cssf.action.report.common.complaint.RNumBarChartAction"><result type="chart"><param name="width">1020</param><param name="height">350</param></result></action></package></struts>

4.jsp

<body>  <div align="center">    <img src="jfcpkg/deptPieChart.action">      <hr>    <img src="jfcpkg/rnumBarChart.action">    </div>  </body>

5.需要的JAR包

jcommon-1.0.17.jar，jfreechart-1.0.14.jar；这两个是必须的，当用到struts2时，还需用到struts2-jfreechart-plugin-2.3.14.jar

下载地址：http://download.csdn.net/detail/lifuxiangcaohui/5729185