jfreechart绘制折线图

大家共勉啊！~！

public class DrawLineHistogram {

 int width;// 图象宽度

 int height; // 图象高度

 String chartTitle;// 图表标题

 String subtitle;// 副标题

 String xTitle;// X轴标题

 String yTitle;// Y轴标题

 String[] cutline;// 图例名称

 String category[]; // 统计种类

 Double[][] data;// 绘图数据

 String servletURI = "/servlet/DisplayChart";// 映射路径

 public DrawLineHistogram() {
  this.width = 450;
  this.height = 325;
  this.chartTitle = "预测数据图";
  this.subtitle = "";
  this.xTitle = "预测日期";
  this.yTitle = "预测数据";
  this.cutline = new String[] { "后9月预测数据图" };
  this.category = new String[] { "200809", "200810", "200811", "200812", "200901", "200902"  };//日期数组
  this.data = new Double[cutline.length][category.length];//数据室double数组
  for (int m = 0; m < cutline.length; m++) {
   for (int n = 0; n < category.length; n++) {
    data[m][n] = 1 + Math.random() * 100;
   }
  }

 }

 public DrawLineHistogram(int width, int height, String chartTitle,
   String subtitle, String xTitle, String yTitle, String[] cutline,
   String[] category, Double[][] data) {
  this.width = width;
  this.height = height;
  this.chartTitle = chartTitle;
  this.subtitle = subtitle;
  this.xTitle = xTitle;
  this.yTitle = yTitle;
  this.cutline = cutline;
  this.category = category;
  this.data = data;
 }

 public DrawLineHistogram(int width, int height, String chartTitle,
   String subtitle, String xTitle, String yTitle, String[] cutline,
   String[] category, Double[][] data, String servletURI) {
  this.width = width;
  this.height = height;
  this.chartTitle = chartTitle;
  this.subtitle = subtitle;
  this.xTitle = xTitle;
  this.yTitle = yTitle;
  this.cutline = cutline;
  this.category = category;
  this.data = data;
  this.servletURI = servletURI;
 }

 public String draw(String path) {

  // 创建绘图数据集
  DefaultCategoryDataset dataset = new DefaultCategoryDataset();
  for (int m = 0; m < cutline.length; m++) {
   for (int n = 0; n < category.length; n++) {
    dataset.addValue(data[m][n], cutline[m], category[n]);
   }
  }

  // 创建图表对象
  JFreeChart chart = ChartFactory.createLineChart(chartTitle, // 图表标题
    xTitle, // X轴标题
    yTitle, // Y轴标题
    dataset, // 绘图数据集
    PlotOrientation.VERTICAL, // 绘制方向
    true, // 显示图例
    true, // 采用标准生成器
    false // 生成链接
    );
  // 自定义图表开始：

  if (subtitle.length() > 0) {// 添加副标题
   chart.addSubtitle(new TextTitle(subtitle));
  }

  GradientPaint chartGP = new GradientPaint(0, 0,
    new Color(219, 227, 127), 0, height, Color.WHITE, false);// 创建渐变色对象
  chart.setBackgroundPaint(chartGP);// 设置图片背景色

  // 通过绘图区对象，可以设置更多的绘图属性
  CategoryPlot plot = chart.getCategoryPlot();

  plot.setBackgroundPaint(Color.WHITE);// 设置绘图区背景色

  plot.setRangeGridlinePaint(Color.RED);// 设置水平方向背景线颜色
  plot.setRangeGridlinesVisible(true);// 设置是否显示水平方向背景线,默认值为true

  plot.setDomainGridlinePaint(Color.RED);// 设置垂直方向背景线颜色
  plot.setDomainGridlinesVisible(true);// 设置是否显示垂直方向背景线,默认值为false

  // 获取折线对象
  LineAndShapeRenderer renderer = (LineAndShapeRenderer) plot
    .getRenderer();

  // 定义折线颜色
  Color color[] = new Color[cutline.length];
  color[0] = Color.GREEN;
  for (int i = 0; i < color.length; i++) {
   renderer.setSeriesPaint(i, color[i]);
  }

  // 定义折线绘制风格
  BasicStroke realLine = new BasicStroke(1.6f);
  float dashes[] = { 8.0f };// 定义虚线数组
  BasicStroke brokenLine = new BasicStroke(1.6f,// 线条粗细
    BasicStroke.CAP_ROUND,// 端点风格
    BasicStroke.JOIN_ROUND,// 折点风格
    8.f,// 折点处理办法
    dashes,// 虚线数组
    0.0f);// 虚线偏移量
  int special = 0;
  for (int i = 0; i < cutline.length; i++) {
   if (i == special) {
    renderer.setSeriesStroke(i, realLine);
   } else {
    renderer.setSeriesStroke(i, brokenLine);
   }
  }

  // 获得横轴对象
  CategoryAxis domainAxis = plot.getDomainAxis();

  // 设置横轴绘制属性
  domainAxis.setAxisLineStroke(new BasicStroke(1.6f));// 设置轴线粗细
  domainAxis.setAxisLinePaint(Color.BLACK);// 设置轴线颜色
  domainAxis.setCategoryLabelPositionOffset(5);// 设置统计种类与轴线的颜色
  domainAxis.setLabelFont(new Font("黑体", Font.BOLD, 16));// 设置坐标轴标题字体
  domainAxis.setLabelPaint(Color.BLACK);// 设置坐标轴标题颜色
  domainAxis.setCategoryLabelPositions(CategoryLabelPositions.STANDARD);// 设置坐标轴标题旋转角度

  // 获得纵轴对象
  ValueAxis rangeAxis = plot.getRangeAxis();

  // 设置纵轴绘制属性
  rangeAxis.setAxisLineStroke(new BasicStroke(1.6f));// 设置轴线粗细
  rangeAxis.setAxisLinePaint(Color.BLACK);// 设置轴线颜色
  //rangeAxis.setUpperBound(100.0f);// 设置坐标最大值
  //rangeAxis.setTickMarkStroke(new BasicStroke(1.6f));// 设置坐标标记大小
  rangeAxis.setTickMarkPaint(Color.BLACK);// 设置坐标标记颜色
  rangeAxis.setLabelFont(new Font("黑体", Font.BOLD, 16));// 设置坐标轴标题字体
  rangeAxis.setLabelPaint(Color.BLACK);// 设置坐标轴标题颜色
  rangeAxis.setLabelAngle(Math.PI / 2);// 设置坐标轴标题旋转角度

  // 自定义图表结束！

  // 固定用法
  ChartRenderingInfo info = new ChartRenderingInfo(
    new StandardEntityCollection());
  
   //解决中文乱码问题
        CategoryPlot categoryplot = (CategoryPlot) chart.getPlot();    
        NumberAxis numberaxis = (NumberAxis) categoryplot.getRangeAxis();      
        CategoryAxis domainAxis1 = categoryplot.getDomainAxis();      
        TextTitle textTitle = chart.getTitle();    
              
        textTitle.setFont(new Font("黑体", Font.PLAIN, 20));       
              
        domainAxis1.setTickLabelFont(new Font("sans-serif", Font.PLAIN, 11));      
              
        domainAxis1.setLabelFont(new Font("宋体", Font.PLAIN, 12));      
             
        numberaxis.setTickLabelFont(new Font("sans-serif", Font.PLAIN, 12));      
            
        numberaxis.setLabelFont(new Font("黑体", Font.PLAIN, 12));      
               
        chart.getLegend().setItemFont(new Font("宋体", Font.PLAIN, 12));  


  //把图片写入指定路径，生成图片
  FileOutputStream fos_jpg = null;
  
  try {
   String imagePath = path+"\\fruit4.jpeg";
   fos_jpg = new FileOutputStream(path+"\\fruit4.jpeg");
   ChartUtilities
     .writeChartAsJPEG(fos_jpg,chart,width,height);
  } catch (Exception e) {
  } finally {
   try {
    fos_jpg.close();
   } catch (Exception e) {
   }
  }

  // 返回图片浏览路径
  return null;

 }

}