JFreeChart与MySQL数据库结合使用

import org.jfree.ui.ApplicationFrame;

import iaqms.com.CustomRenderer;

import java.sql.Connection;

import java.sql.DriverManager;

import java.sql.ResultSet;

import java.sql.SQLException;

import java.sql.Statement;

import javax.swing.JPanel;

import java.awt.Color;

import java.awt.Font;

import java.awt.GradientPaint;

import java.awt.RenderingHints;

import javax.swing.JPanel;

import org.jfree.chart.ChartFactory;

import org.jfree.chart.ChartFrame;

import org.jfree.chart.ChartPanel;

import org.jfree.chart.JFreeChart;

import org.jfree.chart.StandardChartTheme;

import org.jfree.chart.axis.CategoryAxis;

import org.jfree.chart.axis.CategoryLabelPositions;

import org.jfree.chart.axis.NumberAxis;

import org.jfree.chart.axis.NumberTickUnit;

import org.jfree.chart.labels.StandardCategoryItemLabelGenerator;

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.plot.RingPlot;

import org.jfree.chart.renderer.category.BarRenderer;

import org.jfree.chart.title.LegendTitle;

import org.jfree.chart.title.TextTitle;

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.ui.RefineryUtilities;

public class PieChartDB extends ApplicationFrame {

private static final long  serialVersionUID = 1L;

public static void main(String[] args) {

PieChartDB piechart = new PieChartDB("饼状图");

piechart.pack();

RefineryUtilities.centerFrameOnScreen(piechart);

piechart.setVisible(true);

}

//构造函数产生实例

public PieChartDB(String number){

super(number);

setContentPane(createpiePanel());

}

//生成报表的面板

public static JPanel createpiePanel() {

JFreeChart jfreechart = createChart(createDataset());

return new ChartPanel(jfreechart, false);

}

private static JFreeChart createChart(PieDataset dataset){

//解决乱码问题（不能显示中文的问题）

StandardChartTheme mChartTheme = new StandardChartTheme("CN");

mChartTheme.setLargeFont(new Font("黑体", Font.BOLD, 20));

mChartTheme.setExtraLargeFont(new Font("宋体", Font.PLAIN, 15)); //标题

mChartTheme.setRegularFont(new Font("宋体", Font.PLAIN, 15));

ChartFactory.setChartTheme(mChartTheme);

//生成饼状图的对象

JFreeChart chart = ChartFactory.createPieChart(

"图书销量统计图",//图标标题

dataset, //数据

true,//是否显示图例

false,//是否显示工具提示

false//是否生成url

);

//设置一系列的属性

//获得饼图的Plot对象

PiePlot plot = (PiePlot)chart.getPlot();

//用来显示标注的注解，{0}:{1}用来设置显示的格式

plot.setLabelGenerator(new StandardPieSectionLabelGenerator("{0}:{1}"));

plot.setBackgroundPaint(Color.gray);//设置背景色

//设置简单标签

plot.setSimpleLabels(true);

//标题

TextTitle texttitle=chart.getTitle();

texttitle.setFont(new Font("宋体", Font.BOLD, 30));

//图示

LegendTitle legendtitle =chart.getLegend();

legendtitle.setItemFont(new Font("宋体", Font.BOLD, 14));

//设定背景透明度（0-1.0之间）

plot.setBackgroundAlpha(0.5f);

//设定前景透明度（0-1.0之间）

plot.setForegroundAlpha(0.60f);

return chart;

}

private static PieDataset createDataset() {

double[][] table = null;

String[] name = null;

String[] number = null;

int result = 0;

try{

Class.forName("com.mysql.jdbc.Driver").newInstance();

Connection conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/sale", "root", "fab");

ResultSet rs = conn.createStatement().executeQuery("select name,number from sale");

// 取得行数

if (rs.last()){

result = rs.getRow();

rs.beforeFirst(); // 指针回滚

}

table = new double[result][rs.getMetaData().getColumnCount() - 1];// 定义存放数据的二维数组

name = new String[result];

number = new String[rs.getMetaData().getColumnCount() - 1]; // 定义存放数据表头的一维数组

rs.next();

for (int j = 0; j < rs.getMetaData().getColumnCount() - 1; j++) {

number[j] = rs.getMetaData().getColumnName(j + 2); // 取出表头并存放数组

}

int i = 0;

rs.beforeFirst();

while (rs.next()) {

name[i] = rs.getString(1);

for (int j = 0; j < rs.getMetaData().getColumnCount() - 1; j++)

table[i][j] = rs.getDouble(j + 2); // 取出数据并存入二维数组

i++;

}

conn.close(); // 关闭连接

rs.close(); // 关闭查询

} catch (Exception ex) {

System.err.println("Exception:" + ex.getMessage());

}

//创建DefaultPieDataset类型的数据集，并行数据集中添加数据（从数据库中取的数据）

DefaultPieDataset dataset = new DefaultPieDataset();

for (int i = 0; i < number.length; i++)

for (int j = 0; j < result; j++) {

dataset.setValue(name[j],table[j][i] );

//调试用

System.out.println(table[j][i]);

System.out.println(name[j]);

}

return dataset;

}

}

数据库脚本：

CREATE DATABASE /*!32312 IF NOT EXISTS*/`sale` /*!40100 DEFAULT CHARACTER SET gbk */;

USE `sale`;

DROP TABLE IF EXISTS `sale`;

CREATE TABLE `sale` (

`name` varchar(150) default NULL COMMENT ‘书名‘,

`number` varchar(150) default NULL COMMENT ‘数量‘

) ENGINE=InnoDB DEFAULT CHARSET=gbk;

insert  into `sale`(`name`,`number`) values (‘C++‘,‘18‘),(‘Java‘,‘20‘),(‘数据结构‘,‘30‘),(‘安桌‘,‘40‘),(‘IOS‘,‘25‘),(‘计算机网络‘,‘28‘);

运行结果图：