利用JfreeChart实现折线图图片导出

1、首先需要下载安装JDk并配置JDK的环境变量，网上有很多这种说明，这里不做细致说明。

2、下载安装好eclipse开发工具，这里采用4.5.0版本。

3、引入Jfrrechart的jar包，如果网上下载不了，可在maven中央仓库中进行免费下载，maven的中央仓库地址：http://mvnrepository.com/

4、编写实体类进行绘制折线图并导出PNG图片到本地指定位置。package org.com.testJfreechart;import java.awt.BasicStroke;import j锾攒揉敫ava.awt.Color;import java.awt.Font;import java.awt.GradientPaint;import java.io.File;import java.io.IOException;import java.util.HashMap;import java.util.Map;import org.jfree.chart.ChartFactory;import org.jfree.chart.ChartUtilities;import org.jfree.chart.JFreeChart;import org.jfree.chart.axis.NumberAxis;import org.jfree.chart.axis.ValueAxis;import org.jfree.chart.plot.PlotOrientation;import org.jfree.chart.plot.XYPlot;import org.jfree.chart.renderer.xy.XYLineAndShapeRenderer;import org.jfree.chart.title.TextTitle;import org.jfree.data.xy.XYDataset;import org.jfree.data.xy.XYSeries;import org.jfree.data.xy.XYSeriesCollection;public class TestJfreeChart3 { //生成折线图的宽高 private static final int width = 900; private static final int height = 400; //折线图标题、横坐标、纵坐标 private static final String title="利益演示图"; private static final String xString="被保险人年龄"; private static final String yString="个人账户价值（万元）"; private static final String Z_String="部分领取（元）"; //折线图不同颜色线条所代表的含义 个人账户价值低中高 、部分领取 private static final String funderbalLow = "个人账户价值（低）"; private static final String funderbalMid = "个人账户价值（中）"; private static final String funderbalHig = "个人账户价值（高）"; private static final String getPart = "部分领取"; //字体颜色 private static final String blackBold ="黑体"; private static final String luShu ="隶书"; //输出图片png名称及路径 private static final String outFilePath ="D:/out_picture.png"; //折线图 JfreeChart private static JFreeChart creatChart(XYDataset dataset) { //创建XYLineChart JFreeChart chart=ChartFactory.createXYLineChart(title, xString, //X轴标签 yString, //Y轴标签 dataset, PlotOrientation.VERTICAL, true, false, false); //使用XYPlot设置各种参数 XYPlot xyPlot=chart.getXYPlot(); //设置背景色透明度 xyPlot.setBackgroundAlpha(0.5f); //设置前景色透明度 xyPlot.setForegroundAlpha(0.5f); // 曲线图 XYLineAndShapeRenderer xyLineAndShapeRenderer = (XYLineAndShapeRenderer)xyPlot.getRenderer(); //设置线条为数据点 xyLineAndShapeRenderer.setSeriesStroke(0, new BasicStroke(2.0F, 1, 1,1.0F, new float[] { 1F, 6F }, 0.0F)); xyLineAndShapeRenderer.setSeriesStroke(1, new BasicStroke(2.0F, 1, 1,1.0F, new float[] { 1F, 6F }, 0.0F)); xyLineAndShapeRenderer.setSeriesStroke(2, new BasicStroke(2.0F, 1, 1,1.0F, new float[] { 1F, 6F }, 0.0F)); // 设置线颜色 // “个人账户价值”曲线的颜色: 曲线颜色 高 紫红色RGB（156,0,88）, 中 红色 RGB(211,17,69), 低 蓝色 RGB( 0, 115, 174) 以符合公司VI3.0 xyLineAndShapeRenderer.setSeriesPaint(0, new Color(0, 115, 174)); xyLineAndShapeRenderer.setSeriesPaint(1, new Color(211, 17, 69)); xyLineAndShapeRenderer.setSeriesPaint(2, new Color(156, 0, 88)); xyLineAndShapeRenderer.setSeriesPaint(3, new Color(30, 0, 88));//部分领取颜色 TextTitle textTitle=new TextTitle("",new Font(blackBold,Font.BOLD,12)); chart.addSubtitle(textTitle); chart.setTitle(new TextTitle(title, new Font(luShu, Font.ITALIC, 15))); chart.setBackgroundPaint(new GradientPaint(0, 0, Color.white, 0,1000,Color.BLUE)); //解决中文乱码问题 ValueAxis为横坐标 NumberAxis为纵坐标 Font font = new Font("SimSun", 10, 20); NumberAxis rangeAxis = (NumberAxis) xyPlot.getRangeAxis(); rangeAxis.setLabelFont(font); ValueAxis domainAxis = xyPlot.getDomainAxis(); domainAxis.setLabelFont(font); //解决折线图最下方的中文乱码 chart.getLegend().setItemFont(font); // 输出文件到指定目录 try { ChartUtilities.saveChartAsPNG(new File(outFilePath), chart, width, height); } catch (IOException exz) { System.out.print("....Cant’t Create image File"); } return chart; } private static XYDataset creatXYDataset(Object[] datas) { //创建时间数据源 XYSeriesCollection xySeriesCollection=new XYSeriesCollection(); XYSeries xyLineSeries1 = new XYSeries(funderbalLow); XYSeries xyLineSeries2 = new XYSeries(funderbalMid); XYSeries xyLineSeries3 = new XYSeries(funderbalHig); XYSeries xyBarSeries = new XYSeries(getPart); Map<Integer,Double> map = new HashMap<Integer, Double>(); int mapLength = 0; if(datas != null && datas.length>0){ map=(HashMap<Integer, Double>) datas[0]; if(map != null && map.size()>0){ mapLength = map.size(); for(int i=0,j=0;i<mapLength && j<datas.length;i++){ Map<Integer,Double> data = new HashMap<Integer, Double>(); data=(Map<Integer, Double>) datas[j]; if(j==0){ xyLineSeries1.add(i, data.get(i));//设置横纵坐标值 }else if(j==1){ xyLineSeries2.add(i, data.get(i)); }else if(j==2){ xyLineSeries3.add(i,data.get(i)); }else{ xyBarSeries.add(i, data.get(i)); } if(i==mapLength-1){ j++; i=-1; } } } } xySeriesCollection.addSeries(xyLineSeries1); xySeriesCollection.addSeries(xyLineSeries2); xySeriesCollection.addSeries(xyLineSeries3); xySeriesCollection.addSeries(xyBarSeries); return xySeriesCollection; } //模拟填充数据 总共4中数据 key:横坐标 value:纵坐标 public static Object[] getDatas(){ Object[] objects=new Object[4]; for(int i = 0;i<objects.length;i++){ Map<Integer,Double> map = new HashMap<Integer, Double>(); for(int j=0;j<15;j++){ map.put(j,Math.random()); } objects[i]=map; } return objects; } public static void main(String[] args) { //第一步，创建XYDataSet对象(接口) 准备数据 XYDataset dataset=creatXYDataset(getDatas()); //第二部，根据sataSet对象生成JfreeChart，并做相应设置 creatChart(dataset); }}