报表——饼状图

package ambow.ecport.utils;import java.io.IOException;import java.util.HashMap;import java.util.Iterator;import java.util.Map;import javax.servlet.ServletException;import javax.servlet.ServletRequest;import javax.servlet.ServletResponse;import javax.servlet.http.HttpServlet;import org.jfree.chart.ChartFactory;import org.jfree.chart.ChartUtilities;import org.jfree.chart.JFreeChart;import org.jfree.data.general.DefaultPieDataset;/** * 演示通过servlet直接输出图表 * * @author 1e+10 */@SuppressWarnings("serial")public class BarCharServlet extends HttpServlet {public void service(ServletRequest req, ServletResponse res)throws ServletException, IOException {res.setContentType("image/jpeg");DefaultPieDataset data = getDataSet();JFreeChart chart = ChartFactory.createPieChart3D("水果产量图", data, true, false, false);ChartUtilities.writeChartAsJPEG(res.getOutputStream(), 1.0f, chart, 800,600, null);}/** * 获取一个演示用的简单数据集对象 * * @return */private static DefaultPieDataset getDataSet() {DefaultPieDataset dataset = new DefaultPieDataset();Map<String , Integer> map = new HashMap<String, Integer>();map.put("苹果", 100);map.put("梨子", 200);map.put("葡萄", 300);map.put("香蕉", 400);map.put("荔枝", 500);for(Iterator iter = map.entrySet().iterator(); iter.hasNext();) {Map.Entry<String, Integer> e = (Map.Entry<String, Integer>)iter.next();dataset.setValue(e.getKey(), e.getValue());}/*dataset.setValue("苹果", 100);dataset.setValue("梨子", 200);dataset.setValue("葡萄", 300);dataset.setValue("香蕉", 400);dataset.setValue("荔枝", 500);*/return dataset;}}