jfreechar的使用 —Java教程网

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首先要有jfreechart-1.0.6.jar，jfreechart-1.0.6-swt.jar和jfreechart-1.0.6-experimental.jar这几个jar包

2．Web.xml文件的配置:

<servlet-name>DisplayChart</servlet-name>

<servlet-class>

org.jfree.chart.servlet.DisplayChart

</servlet-class>

</servlet>

<servlet-mapping>

<servlet-name>DisplayChart</servlet-name>

<url-pattern>/servlet/DisplayChart</url-pattern>

</servlet-mapping>

一．柱状形

1.java代码：

package com.tryit;

import java.awt.Color;

import java.awt.Font;

import java.awt.GradientPaint;

import java.awt.RenderingHints;

import java.io.PrintWriter;

import javax.servlet.http.HttpSession;

import org.jfree.chart.ChartFactory;

import org.jfree.chart.ChartRenderingInfo;

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.entity.StandardEntityCollection;

import org.jfree.chart.labels.CategoryItemLabelGenerator;

import org.jfree.chart.plot.CategoryPlot;

import org.jfree.chart.plot.PlotOrientation;

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

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

import org.jfree.chart.servlet.ServletUtilities;

import org.jfree.chart.title.TextTitle;

import org.jfree.data.category.CategoryDataset;

import org.jfree.data.category.DefaultCategoryDataset;

publicclass CategoryItemChart {

publicstatic String generateBarChart(HttpSession session, PrintWriter pw,

int w, int h) {

String filename = null;

try {

CategoryDataset dataset = createDataset();

JFreeChart chart = ChartFactory.createBarChart("车辆管理",//图表标题

"车辆分类",//X轴标题

"车辆比例",//Y轴标题

dataset,//数据集合

PlotOrientation.VERTICAL,//图表显示方向（水平、垂直）

true,//是否使用图例

false,//是否使用工具提示

false//是否为图表增加URL

);

/*------------配置图表属性--------------*/

// 1,设置整个图表背景颜色

chart.setBackgroundPaint(Color.yellow);

/*------------设定Plot参数-------------*/

CategoryPlot plot = chart.getCategoryPlot();

// 2,设置详细图表的显示细节部分的背景颜色

plot.setBackgroundPaint(Color.PINK);

// 3,设置垂直网格线颜色

plot.setDomainGridlinePaint(Color.black);

//4,设置是否显示垂直网格线

plot.setDomainGridlinesVisible(true);

//5,设置水平网格线颜色

plot.setRangeGridlinePaint(Color.yellow);

//6,设置是否显示水平网格线

plot.setRangeGridlinesVisible(true);

/*---------将所有数据转换为整数形式---------*/

final NumberAxis rangeAxis = (NumberAxis) plot.getRangeAxis();

rangeAxis.setStandardTickUnits(NumberAxis.createIntegerTickUnits());

/*---------设置是否在柱图的状态条上显示边框----*/

CategoryItemRenderer renderer = (CategoryItemRenderer) plot

.getRenderer();

BarRenderer render = (BarRenderer) plot.getRenderer();

render.setItemMargin(0.1);

/*---------设置状态条颜色的深浅渐变-----------*/

GradientPaint gp0 = new GradientPaint(0.0f, 0.0f, new Color(255,

200, 80), 0.0f, 0.0f, new Color(255, 255, 40));

GradientPaint gp1 = new GradientPaint(0.0f, 0.0f, new Color(50,

255, 50), 0.0f, 0.0f, new Color(100, 255, 100));

GradientPaint gp2 = new GradientPaint(0.0f, 0.0f, Color.red, 0.0f,

0.0f, new Color(255, 100, 100));

GradientPaint gp3 = new GradientPaint(0.0f, 0.0f, new Color(108,

108, 255), 0.0f, 0.0f, new Color(150, 150, 200));

renderer.setSeriesPaint(0, gp0);

renderer.setSeriesPaint(1, gp1);

renderer.setSeriesPaint(2, gp2);

renderer.setSeriesPaint(3, gp3);

* 解决柱状体与图片边框的间距问题

* */

/*------设置X轴标题的倾斜程度----*/

CategoryAxis domainAxis = plot.getDomainAxis();

domainAxis.setCategoryLabelPositions(CategoryLabelPositions

.createUpRotationLabelPositions(Math.PI / 6.0));

/*------设置柱状体与图片边框的左右间距--*/

domainAxis.setLowerMargin(0.01);

domainAxis.setUpperMargin(0.01);

/*------设置柱状体与图片边框的上下间距---*/

ValueAxis rAxis = plot.getRangeAxis();

rAxis.setUpperMargin(0.15);

rAxis.setLowerMargin(0.15);

/*---------设置每一组柱状体之间的间隔---------*/

render.setItemMargin(0.0);

* 解决柱状体与图片边框的间距问题

* */

* 解决JFREECHART的中文显示问题

* */

/*----------设置消除字体的锯齿渲染（解决中文问题）--------------*/

chart.getRenderingHints().put(RenderingHints.KEY_TEXT_ANTIALIASING,

RenderingHints.VALUE_TEXT_ANTIALIAS_OFF);

/*----------设置标题字体--------------------------*/

TextTitle textTitle = chart.getTitle();

textTitle.setFont(new Font("黑体", Font.PLAIN, 20));

/*------设置X轴坐标上的文字-----------*/

domainAxis.setTickLabelFont(new Font("sans-serif", Font.PLAIN, 11));

/*------设置X轴的标题文字------------*/

domainAxis.setLabelFont(new Font("宋体", Font.PLAIN, 12));

/*------设置Y轴坐标上的文字-----------*/

rAxis.setTickLabelFont(new Font("sans-serif", Font.PLAIN, 12));

/*------设置Y轴的标题文字------------*/

rAxis.setLabelFont(new Font("黑体", Font.PLAIN, 12));

/*---------设置柱状体上的显示的字体---------*/

renderer.~~setItemLabelGenerator~~(new LabelGenerator(0.0));

renderer.~~setItemLabelFont~~(new Font("宋体", Font.PLAIN, 12));

renderer.~~setItemLabelsVisible~~(true);

* 解决JFREECHART的中文显示问题

* */

/*------得到chart的保存路径----*/

ChartRenderingInfo info = new ChartRenderingInfo(

new StandardEntityCollection());

filename = ServletUtilities.saveChartAsPNG(chart, w, h, info,

session);

/*------使用printWriter将文件写出----*/

ChartUtilities.writeImageMap(pw, filename, info, true);

pw.flush();

} catch (Exception e) {

System.out.println("Exception - " + e.toString());

e.printStackTrace(System.out);

filename = "public_error_500x300.png";

}

return filename;

}

/*-------------设置柱状体顶端的数据显示--------------*/

staticclass LabelGenerator implements CategoryItemLabelGenerator {

privatedoublethreshold;

public LabelGenerator(double threshold) {

this.threshold = threshold;

}

public String generateLabel(CategoryDataset dataset, int row, int column) {

String result = null;

final Number value = dataset.getValue(row, column);

if (value != null) {

finaldouble v = value.doubleValue();

if (v > this.threshold) {

result = value.toString();
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