jFreeChart利用CategoryDatase,ChartFactory.createBarChart生成的柱状图
package com.potevio.rnd;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import org.jfree.chart.ChartFactory;
import org.jfree.chart.ChartUtilities;
import org.jfree.chart.JFreeChart;
import org.jfree.chart.plot.CategoryPlot;
import org.jfree.chart.plot.PlotOrientation;
import org.jfree.data.category.CategoryDataset;
import org.jfree.data.general.DatasetUtilities;
public class CreateJFreeChartBar {
/**
* 创建JFreeChart Bar Chart（柱状图）
*/
public static void main(String[] args) {
//步骤1：创建CategoryDataset对象（准备数据）
CategoryDataset dataset = createDataset();
//步骤2：根据Dataset 生成JFreeChart对象，以及做相应的设置
JFreeChart freeChart = createChart(dataset);
//步骤3：将JFreeChart对象输出到文件，Servlet输出流等
saveAsFile(freeChart, "F:\\jfreechart\\bar.png", 500, 400);
}
//保存为文件
public static void saveAsFile(JFreeChart chart, String outputPath, int weight, int height) {
FileOutputStream out = null;
try {
File outFile = new File(outputPath);
if (!outFile.getParentFile().exists()) {
outFile.getParentFile().mkdirs();
}
out = new FileOutputStream(outputPath);
//保存为PNG文件
ChartUtilities.writeChartAsPNG(out, chart, weight, height);
//保存为JPEG文件
//ChartUtilities.writeChartAsJPEG(out, chart, weight, height);
out.flush();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} finally {
if (out != null) {
try {
out.close();
} catch (IOException e) {
//do nothing
}
}
}
}
//根据CategoryDataset生成JFreeChart对象
public static JFreeChart createChart(CategoryDataset categoryDataset) {
JFreeChart jfreechart = ChartFactory.createBarChart("Bar Chart Demo", //标题
"产品", //categoryAxisLabel （category轴，横轴，X轴的标签）
"数量", //valueAxisLabel（value轴，纵轴，Y轴的标签）
categoryDataset, // dataset
PlotOrientation.VERTICAL,
true, // legend
false, // tooltips
false); // URLs
//以下的设置可以由用户定制，也可以省略
CategoryPlot plot = (CategoryPlot) jfreechart.getPlot();
//背景色 透明度
plot.setBackgroundAlpha(0.5f);
//前景色 透明度
plot.setForegroundAlpha(0.5f);
//其它设置可以参考 CategoryPlot
return jfreechart;
}
/**
* 创建CategoryDataset对象
*
*/
public static CategoryDataset createDataset() {
String []rowKeys = {"One", "Two", "Three"};
String []colKeys = {"1987", "1997", "2007"};
double [][] data = {
{50, 20, 30},
{20, 10D, 40D},
{40, 30.0008D, 38.24D},
};
//也可以使用以下代码
//DefaultCategoryDataset categoryDataset = new DefaultCategoryDataset();
//categoryDataset.addValue(10, "rowKey", "colKey");
return DatasetUtilities.createCategoryDataset(rowKeys, colKeys, data);
}
}
运行效果图：
附上另外一份代码：
package com;
import java.awt.Color;
import java.awt.Font;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.text.DecimalFormat;
import org.jfree.chart.ChartFactory;
import org.jfree.chart.ChartUtilities;
import org.jfree.chart.JFreeChart;
import org.jfree.chart.axis.CategoryAxis;
import org.jfree.chart.axis.CategoryLabelPositions;
import org.jfree.chart.axis.NumberAxis;
import org.jfree.chart.axis.ValueAxis;
import org.jfree.chart.labels.ItemLabelAnchor;
import org.jfree.chart.labels.ItemLabelPosition;
import org.jfree.chart.labels.StandardCategoryItemLabelGenerator;
import org.jfree.chart.plot.CategoryPlot;
import org.jfree.chart.plot.PlotOrientation;
import org.jfree.chart.renderer.category.BarRenderer;
import org.jfree.chart.title.TextTitle;
import org.jfree.data.category.CategoryDataset;
import org.jfree.data.general.DatasetUtilities;
import org.jfree.ui.TextAnchor;
public class CreateJFreeChartBar3 {
public static void main(String[] args) {
//步骤1：创建CategoryDataset对象（准备数据）
CategoryDataset dataset = createDataset();
//步骤2：根据Dataset 生成JFreeChart对象，以及做相应的设置
JFreeChart freeChart = createChart(dataset);
//步骤3：将JFreeChart对象输出到文件，Servlet输出流等
saveAsFile(freeChart, "E:\\jfreechart\\batpic.png", 600, 500);
}
//保存为文件
public static void saveAsFile(JFreeChart chart, String outputPath, int weight, int height) {
FileOutputStream out = null;
try {
File outFile = new File(outputPath);
if (!outFile.getParentFile().exists()) {
outFile.getParentFile().mkdirs();
}
out = new FileOutputStream(outputPath);
//保存为PNG文件
ChartUtilities.writeChartAsPNG(out, chart, weight, height);
//保存为JPEG文件
//ChartUtilities.writeChartAsJPEG(out, chart, weight, height);
out.flush();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} finally {
if (out != null) {
try {
out.close();
} catch (IOException e) {
//do nothing
}
}
}
}
//根据CategoryDataset生成JFreeChart对象
public static JFreeChart createChart(CategoryDataset categoryDataset) {
JFreeChart jfreechart = ChartFactory.createBarChart("", //标题
"人员", //categoryAxisLabel （category轴，横轴，X轴的标签）
"次数", //valueAxisLabel（value轴，纵轴，Y轴的标签）
categoryDataset, // dataset
PlotOrientation.VERTICAL,
true, // legend
false, // tooltips
false); // URLs
TextTitle title = jfreechart.getTitle();
title.setFont(new Font("宋体", Font.BOLD, 12));
//以下的设置可以由用户定制，也可以省略
// 取得状图plot对象
CategoryPlot plot = (CategoryPlot) jfreechart.getPlot();
plot.setBackgroundPaint(Color.lightGray);
// plot.setBackgroundPaint(new Color(255, 255, 204));// 设置柱图背景色（注意，系统取色的时候要使用16位的模式来查看颜色编码，这样比较准确）
plot.setRangeGridlinesVisible(true);// 设置横虚线可见
plot.setRangeGridlinePaint(Color.gray);// 虚线色彩
// x轴设置
CategoryAxis domainAxis = plot.getDomainAxis();
//domainAxis.setLabelFont(labelFont);// 轴标题
//domainAxis.setTickLabelFont(labelFont);// 轴数值
domainAxis.setCategoryLabelPositions(CategoryLabelPositions.createUpRotationLabelPositions(Math.PI / 3.0));//度倾斜
domainAxis.setMaximumCategoryLabelWidthRatio(0.6f);// 横轴上的 Lable 是否完整显示
domainAxis.setLowerMargin(0.05);// 设置距离图片左端距离
domainAxis.setUpperMargin(0.05);// 设置距离图片右端距离
plot.setDomainAxis(domainAxis);
domainAxis.setLabelFont(new Font("宋体", Font.BOLD, 12));// X轴的标题文字字体 隶书
domainAxis.setTickLabelFont(new Font("宋体", Font.BOLD, 12));// X轴坐标上数值字体
// domainAxis.setCategoryLabelPositions(CategoryLabelPositions.DOWN_45); // X轴上的Lable让其45度倾斜 .UP_45
// y轴设置
ValueAxis rangeAxis = plot.getRangeAxis();
//rangeAxis.setLabelFont(labelFont);
//rangeAxis.setTickLabelFont(labelFont);
// rangeAxis.setRange(85, 100.5);//纵轴显示范围
rangeAxis.setAutoTickUnitSelection(true);
rangeAxis.setUpperMargin(0.15);// 设置最高的一个 Item 与图片顶端的距离
rangeAxis.setLowerMargin(0.15);// 设置最低的一个 Item 与图片底端的距离
//设置 柱子的提示 中文处理
jfreechart.getLegend().setItemFont(new Font("宋体", Font.BOLD,10));
//plot.setRangeAxis(rangeAxis);
// Y轴精度
NumberAxis vn = (NumberAxis) plot.getRangeAxis();
DecimalFormat df = new DecimalFormat("#0");
vn.setNumberFormatOverride(df); // 数据轴数据标签的显示格式
rangeAxis.setAutoTickUnitSelection(true);//步长自动设置
rangeAxis.setStandardTickUnits(NumberAxis.createStandardTickUnits());//纵轴单元为整型
rangeAxis.setLabelFont(new Font("宋体", Font.BOLD, 12));// y轴的标题文字字体
rangeAxis.setTickLabelFont(new Font("宋体", Font.BOLD, 12));// y轴坐标上数值字体
//柱子属性
BarRenderer renderer = new BarRenderer();
renderer.setMaximumBarWidth(0.1);// 设置柱子宽度//TODO 0.05
renderer.setMinimumBarLength(0.2);// 设置柱子高度
renderer.setBaseOutlinePaint(Color.BLACK);// 设置柱子边框颜色
renderer.setDrawBarOutline(true);// 设置柱子边框可见
//renderer.setSeriesPaint(0, new Color(51, 204, 204));// 设置柱的颜色
//renderer.setSeriesPaint(1, new Color(253, 204, 255));
for(int i = 0 ; i < 10; i++){
renderer.setSeriesPaint(i, Color.decode("#2EDE1E"));
renderer.setSeriesOutlinePaint(i, Color.BLACK);
}
renderer.setItemMargin(0.0);// 设置每个地区所包含的平行柱的之间距离
// 显示每个柱的数值，并修改该数值的字体属性
renderer.setIncludeBaseInRange(true);
renderer.setBaseItemLabelGenerator(new StandardCategoryItemLabelGenerator());
renderer.setBaseItemLabelsVisible(true);
renderer.setBaseItemLabelFont(new Font("宋体", Font.BOLD, 12));// 数值字体TRUETYPE_FONT
renderer.setBasePositiveItemLabelPosition(new ItemLabelPosition(ItemLabelAnchor.OUTSIDE12,TextAnchor.BASELINE_CENTER));//数值显示位置
plot.setRenderer(renderer);
plot.setForegroundAlpha(1.0f);// 设置柱的透明度
// //背景色 透明度
// plot.setBackgroundAlpha(0.5f);
// //前景色 透明度
// plot.setForegroundAlpha(0.5f);
return jfreechart;
}
/**
* 创建CategoryDataset对象
*
*/
public static CategoryDataset createDataset() {
String []rowKeys = {"次数"};
String []colKeys = {"一二", "二二", "三二","三一", "二三二",
"二三三","二三五", "二三四", "二三六","一二三"};
double [][] data = {
{50,41,30,20,29,45,21,32,40,38}
};
return DatasetUtilities.createCategoryDataset(rowKeys, colKeys, data);
}
}
运行效果图：