java 饼图
import java.awt.Color;
import java.awt.Font;
import java.io.PrintWriter;
import java.text.DecimalFormat;
import java.util.List;
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.entity.StandardEntityCollection;
import org.jfree.chart.labels.ItemLabelAnchor;
import org.jfree.chart.labels.ItemLabelPosition;
import org.jfree.chart.labels.StandardCategoryItemLabelGenerator;
import org.jfree.chart.labels.StandardPieSectionLabelGenerator;
import org.jfree.chart.labels.StandardPieToolTipGenerator;
import org.jfree.chart.plot.CategoryPlot;
import org.jfree.chart.plot.PiePlot3D;
import org.jfree.chart.plot.PlotOrientation;
import org.jfree.chart.renderer.category.BarRenderer3D;
import org.jfree.chart.servlet.ServletUtilities;
import org.jfree.data.category.DefaultCategoryDataset;
import org.jfree.data.general.DefaultPieDataset;
import org.jfree.ui.TextAnchor;
public class ChartGenerater{
/**
* @ 利用JFreeChart生成柱形及饼状图
* @version JFreeChart 1.08
* @ List list 生成图形的源数据
* @ String titles 标题
* @ String x 图形的水平轴注释
* @ String y 图形的垂直轴注释
* @ String charttype 图形类型，piechart为饼图，barchart为柱形图
*/
public static String generateChart(List list, String titles,
HttpSession session, PrintWriter pw, String x, String y,
String charttype) {
String filename = "";
Font font;
int len = list.size();
if ("piechart".equals(charttype.trim())) {
try {
// 建立PieDataSet
DefaultPieDataset dataset = new DefaultPieDataset();
// 生成一个3D饼图
for(int i=0;i<len;i++) {
String[] rows = (String[]) list.get(i);
double count = Double.parseDouble(rows[1]);
dataset.setValue(""+(i+1), count);
}
PiePlot3D plot = new PiePlot3D(dataset);
for(int i=0;i<len;i++){
plot.setSectionPaint(i, getAwtCol(i));
}
plot.setForegroundAlpha(0.6f); // 设置透明度
plot.setCircular(true, false);
//plot.setNoDataMessage("There aren't anything!");
plot.setLabelGenerator(new StandardPieSectionLabelGenerator("({0}):{2}",new DecimalFormat("0"), new DecimalFormat("0.0%")));
plot.setLegendLabelGenerator(new StandardPieSectionLabelGenerator("{2}",new DecimalFormat("0"), new DecimalFormat("0.0%")));
plot.setToolTipGenerator(new StandardPieToolTipGenerator());
//font = new Font("SimSun",Font.BOLD, 15);// 设置统计图标题的字体和大小 Lucida Sans simsun
JFreeChart chart = new JFreeChart("",JFreeChart.DEFAULT_TITLE_FONT, plot, true);
/*
JFreeChart chart = ChartFactory.createPieChart("招聘网统计图表", // 图表标题
data, true, // 是否显示图例
false, false); //写图表对象到文件，参照柱状图生成源码
*/
chart.setTextAntiAlias(true);//设置标题平滑效果
chart.setBorderVisible(false);//设置图片外边框显示
//TextTitle tt = new TextTitle(unescape(titles));
//tt.setFont(font);
chart.setBackgroundPaint(java.awt.Color.white);// 统计图片的底色
//chart.setTitle(tt);
// 把生成的文件写入到临时的目录中
ChartRenderingInfo info = new ChartRenderingInfo(new StandardEntityCollection());
filename = ServletUtilities.saveChartAsPNG(chart, 500, 350,info, session);
// 选择存储成png格式的文件，当然你也可以使用saveChartAsJPEG的方法生成jpg图片
// 把image map 写入到 PrintWriter
ChartUtilities.writeImageMap(pw, filename, info, false);
pw.flush();
} catch (Exception ex) {
System.err.println("error:" + ex.getMessage());
}
}
// 生成柱形图
if ("barchart".equals(charttype.trim())) {
try {
BarRenderer3D renderer = new BarRenderer3D();
DefaultCategoryDataset dataset = new DefaultCategoryDataset();
for (int i = 0; i < len; i++) {
String[] rows = (String[]) list.get(i);
int count = Integer.parseInt(rows[1]);
dataset.setValue(count, ""+(i+1), ""+(i+1));
renderer.setSeriesPaint(i, getAwtCol(i));
}
JFreeChart chart = ChartFactory.createBarChart3D(" ", x, y, dataset,PlotOrientation.VERTICAL, false, false, false);
chart.setBackgroundPaint(Color.WHITE);
CategoryPlot plot = chart.getCategoryPlot();
CategoryAxis domainAxis = plot.getDomainAxis();
domainAxis.setAxisLineVisible(true);
plot.setDomainAxis(domainAxis);
renderer.setBaseOutlinePaint(Color.BLACK);
// 设置每个地区所包含的平行柱的之间距离
renderer.setItemMargin(0.06);
// 显示每个柱的数值，并修改该数值的字体属性
renderer.setBaseItemLabelsVisible(true);
renderer.setBaseItemLabelGenerator(new StandardCategoryItemLabelGenerator());
font = new Font("SimSun",Font.BOLD,12); //Lucida Sans
renderer.setBaseItemLabelFont(font);
renderer.setBasePositiveItemLabelPosition(new ItemLabelPosition(
ItemLabelAnchor.OUTSIDE12, TextAnchor.BASELINE_CENTER));
//ValueAxis rangeAxis = plot.getRangeAxis();
// 设置最高的一个柱与图片顶端的距离
//rangeAxis.setUpperMargin(0.15);
// 设置最低的一个柱与图片底端的距离
// rangeAxis.setLowerMargin(0.15);
//plot.setRangeAxis(rangeAxis);
//plot.setNoDataMessage("There aren't anything!");
plot.setRenderer(renderer);
plot.setRangeGridlinesVisible(true);
// 设置柱的透明度
plot.setForegroundAlpha(0.8f);
StandardEntityCollection sec = new StandardEntityCollection();
ChartRenderingInfo info = new ChartRenderingInfo(sec);
// 500是图片长度，300是图片高度
filename = ServletUtilities.saveChartAsPNG(chart, 500, 280,
info, session);
ChartUtilities.writeImageMap(pw, filename, info, false);
pw.flush();
} catch (Exception ex) {
System.err.println("error:" + ex.getMessage());
}
}
return filename;
}
public static String unescape(Object obj) {
if (obj == null)
return "";
String str = obj.toString().trim();
StringBuffer sb = new StringBuffer(str.length());
int len = 0;
int pos = 0;
char ch;
while (len < str.length()) {
pos = str.indexOf("%", len);
if (pos == len) {
if (str.charAt(pos + 1) == 'u') {
ch = (char) Integer.parseInt(str
.substring(pos + 2, pos + 6), 16);
sb.append(ch);
len = pos + 6;
} else {
ch = (char) Integer.parseInt(str
.substring(pos + 1, pos + 3), 16);
sb.append(ch);
len = pos + 3;
}
} else {
if (pos == -1) {
sb.append(str.substring(len));
len = str.length();
} else {
sb.append(str.substring(len, pos));
len = pos;
}
}
}
return sb.toString();
}
public static Color getAwtCol(int i){
if(i > 9) return Color.BLUE;
Color[] cols = new Color[]{
Color.RED,
Color.BLUE,
Color.BLACK,
Color.YELLOW,
Color.GREEN,
Color.MAGENTA,
Color.ORANGE,
Color.PINK,
Color.DARK_GRAY,
Color.CYAN
};
return cols[i];
}
}
页面调用
filename = CRMChartGenerater.generateChart(list,escape(title),session, new java.io.PrintWriter(out),"","",charttype);
graphURL = request.getContextPath() + "/chart?filename=" + filename;
<img src="<%=graphURL %>" border=0 usemap="#<%= filename %>"/>