JFreeChart_生成一张图片

需要添加Jar： package demo; import java.awt.Font; import java.io.FileOutputStream; import java.io.IOException; import javax.servlet.http.HttpServletRequest; import org.apache.struts2.ServletActionContext; import org.jfree.chart.ChartFactory; import org.jfree.chart.ChartUtilities; import org.jfree.chart.JFreeChart; import org.jfree.chart.plot.PiePlot; import org.jfree.chart.title.LegendTitle; import org.jfree.chart.title.TextTitle; import org.jfree.data.general.DefaultPieDataset; import com.opensymphony.xwork2.ActionSupport; public class PieChartDemo extends ActionSupport { HttpServletRequest request = ServletActionContext.getRequest(); //获取上下文 //HttpServletResponse response = ServletActionContext.getResponse(); public static void main(String[] args) throws IOException { DefaultPieDataset data = getDataSet(); //JFreeChart chart = ChartFactory.createPieChart( //生成3D饼图 JFreeChart chart = ChartFactory.createPieChart3D( "图书销量统计图", // 图表标题 getDataSet(), //数据 true, // 是否显示图例 false, //是否显示工具提示 false //是否生成URL ); //重新设置图标标题，改变字体 chart.setTitle(new TextTitle("图书销量统计图", new Font("黑体", Font.ITALIC , 22))); //取得统计图标的第一个图例 LegendTitle legend = chart.getLegend(0); //修改图例的字体 legend.setItemFont(new Font("宋体", Font.BOLD, 14)); //获得饼图的Plot对象 PiePlot plot = (PiePlot)chart.getPlot(); //设置饼图各部分的标签字体 plot.setLabelFont(new Font("隶书", Font.BOLD, 18)); //设定背景透明度（0-1.0之间） plot.setBackgroundAlpha(0.9f); //设定前景透明度（0-1.0之间） plot.setForegroundAlpha(0.50f); FileOutputStream fos = new FileOutputStream("book.jpg"); System.out.println("fos="+fos); ChartUtilities.writeChartAsJPEG( fos, //输出到哪个输出流 1, //JPEG图片的质量，0~1之间 chart, //统计图标对象 800, //宽 600,//宽 null //ChartRenderingInfo 信息 ); fos.close(); } private static DefaultPieDataset getDataSet() { DefaultPieDataset dataset = new DefaultPieDataset(); dataset.setValue("J2ME嵌入式开发",47000); dataset.setValue("J2EE web应用开发",38000); dataset.setValue("基于J2EE的Ajax开发",31000); dataset.setValue("JavaScript权威指南",29000); dataset.setValue("J2SE应用开发",25000); return dataset; } }