JFreeChart 案例1-eolink官网

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 jfree.org

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 serialVersionUID */ 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 serialVersionUID */ 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 retMap = new LinkedHashMap(); 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 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

330 200 1020 350

4.jsp

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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