實現代碼：

LineChartServlet.java

package com.lmb.jfreechart;import java.awt.BasicStroke; import java.awt.Color; import java.awt.Font; import java.io.IOException; import java.util.Date;import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse;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.chart.renderer.category.LineAndShapeRenderer; import org.jfree.chart.title.TextTitle; import org.jfree.data.category.CategoryDataset; import org.jfree.data.category.DefaultCategoryDataset; import org.jfree.ui.HorizontalAlignment; import org.jfree.ui.RectangleEdge;public class LineChartServlet extends HttpServlet {private static final long serialVersionUID = 1585397081043433662L;public LineChartServlet() {super();}public void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {this.doPost(request, response);}public void doPost(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {// 設置返回類型為圖片response.setContentType("image/png");// 獲取數據集對象CategoryDataset dataset = createDataset();// 創建圖形對象JFreeChart jfreechart = ChartFactory.createLineChart("08年圖書銷售量",null, "銷售量", dataset, PlotOrientation.VERTICAL, false, true,false);// 設置圖表的子標題jfreechart.addSubtitle(new TextTitle("按月份"));// 創建一個標題TextTitle texttitle = new TextTitle("日期: " + new Date());// 設置標題字體texttitle.setFont(new Font("黑體", 0, 10));// 設置標題向下對齊texttitle.setPosition(RectangleEdge.BOTTOM);// 設置標題向右對齊texttitle.setHorizontalAlignment(HorizontalAlignment.RIGHT);// 添加圖表的子標題jfreechart.addSubtitle(texttitle);// 設置圖表的背景色為白色jfreechart.setBackgroundPaint(Color.white);// 獲得圖表區域對象CategoryPlot categoryplot = (CategoryPlot) jfreechart.getPlot();categoryplot.setBackgroundPaint(Color.lightGray);categoryplot.setRangeGridlinesVisible(false);// 獲顯示線條對象LineAndShapeRenderer lineandshaperenderer = (LineAndShapeRenderer) categoryplot.getRenderer();lineandshaperenderer.setBaseShapesVisible(true);lineandshaperenderer.setDrawOutlines(true);lineandshaperenderer.setUseFillPaint(true);lineandshaperenderer.setBaseFillPaint(Color.white);// 設置折線加粗lineandshaperenderer.setSeriesStroke(0, new BasicStroke(3F));lineandshaperenderer.setSeriesOutlineStroke(0, new BasicStroke(2.0F));// 設置折線拐點lineandshaperenderer.setSeriesShape(0,new java.awt.geom.Ellipse2D.Double(-5D, -5D, 10D, 10D));// 將圖表已數據流的方式返回給客戶端ChartUtilities.writeChartAsPNG(response.getOutputStream(), jfreechart,500, 270);}/*** 返回數據集* * @return*/private static CategoryDataset createDataset() {DefaultCategoryDataset defaultdataset = new DefaultCategoryDataset();for (int i = 1; i <= 12; i++) {defaultdataset.addValue(DataUtils.getRandomData(), "JAVA", i + "月");defaultdataset.addValue(DataUtils.getRandomData(), "PHP", i + "月");}return defaultdataset;}}

web.xml略。。。

總結：

1、利用CategoryGataSet數據集繪制折線圖；

2、對應創建折線圖的方法是createLineChart()；

3、通過TextTitle對象設置圖表的子標題；

4、利用LineAndShapeRenderer線條對象，設置折線的顯示方式。

超強干貨來襲 云風專訪：近40年碼齡，通宵達旦的技術人生

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