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 block
      e.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_dept
      String 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 block
      e.printStackTrace();
    } catch (ClassNotFoundException e) {
      // TODO Auto-generated catch block
      e.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

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