用Jfree实现条形柱状图表，java代码实现

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用Jfree实现条形柱状图表，java代码实现。可经常用于报表的制作，代码自动生成后可以自由查看。可以自由配置图表的各个属性，用来达到自己的要求和目的
package test1;import org.jfree.chart.*;import org.jfree.chart.plot.*;import org.jfree.chart.labels.*;import org.jfree.data.category.*;import java.awt.*;import java.io.FileOutputStream;import java.io.IOException;import java.sql.Connection;import java.sql.ResultSet;import java.sql.SQLException;import java.sql.Statement;import java.text.DateFormat;import java.text.SimpleDateFormat;import java.util.Calendar;import java.util.Date;import org.jfree.ui.*;import org.jfree.chart.renderer.category.BarRenderer;import org.jfree.chart.renderer.category.BarRenderer3D;import org.jfree.chart.servlet.*;import org.jfree.chart.plot.PlotOrientation;import org.jfree.data.general.DatasetUtilities;import com.dao.DBConnection;public class JfreeChart {public static void main(String[] args) throws IOException, SQLException {// TODO Auto-generated method stubdouble[][] data = new double[][] {{ 1230, 1110, 1120, 1210, 720, 750, 860, 800, 1230, 1110, 1120,1210, 720, 750, 860, 800, 1230, 1110, 1120, 1210, 720,750, 860, 800 },{ 720, 750, 860, 800, 1230, 1110, 1120, 1210, 720, 750, 860,800, 720, 750, 860, 800, 1230, 1110, 1120, 1210, 720,750, 860, 800 } };String[] rowKeys = { "a", "b" };String[] columnKeys = { "0", "1", "2", "3", "4", "5", "6", "7", "8","9", "10", "11", "12", "13", "14", "15", "16", "17", "18","19", "20", "21", "22", "23" };CategoryDataset dataset = DatasetUtilities.createCategoryDataset(rowKeys, columnKeys, data);JFreeChart chart = ChartFactory.createBarChart(getNextDay() + "日交易量","时间（/h）", "交易量", 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BarRenderer renderer = new BarRenderer();// 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(0.05);plot.setRenderer(renderer);// 设置地区、销量的显示位置// 将下方的“标注”放到上方// plot.setDomainAxisLocation(AxisLocation.TOP_OR_RIGHT);// 将默认放在左边的“销量”放到右方// plot.setRangeAxisLocation(AxisLocation.BOTTOM_OR_RIGHT);drawToOutputStream("src//a.jpg", chart);}/** * step3: 输出图表到指定的磁盘 *  * @param destPath * @param chart */public static void drawToOutputStream(String destPath, JFreeChart chart) {FileOutputStream fos = null;try {fos = new FileOutputStream(destPath);// ChartUtilities.writeChartAsJPEG(ChartUtilities.writeChartAsPNG(fos, // 指定目标输出流chart, // 图表对象1000, // 宽500, // 高null); // ChartRenderingInfo信息} catch (IOException e) {e.printStackTrace();} finally {try {fos.close();} catch (IOException e) {e.printStackTrace();}}}public static String getNextDay() {Calendar calendar = Calendar.getInstance();calendar.add(Calendar.DATE, -1); // 得到前一天Date date = calendar.getTime();DateFormat df = new SimpleDateFormat("yyyy-MM-dd");// System.out.println(df.format(date));return df.format(date);}}
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