JFreeChart绘制折线图实例

  1 package com.mvc.controller;
  2 
  3 import java.util.HashMap;
  4 import java.util.List;
  5 import java.util.Map;
  6 import javax.servlet.http.HttpServletRequest;
  7 import java.awt.Color;
  8 import java.awt.Font;
  9 import java.awt.RenderingHints;
 10 
 11 import org.jfree.chart.ChartColor;
 12 import org.jfree.chart.ChartFactory;
 13 import org.jfree.chart.JFreeChart;
 14 import org.jfree.chart.axis.CategoryAxis;
 15 import org.jfree.chart.axis.ValueAxis;
 16 import org.jfree.chart.labels.StandardCategoryItemLabelGenerator;
 17 import org.jfree.chart.plot.CategoryPlot;
 18 import org.jfree.chart.plot.PlotOrientation;
 19 import org.jfree.chart.renderer.category.LineAndShapeRenderer;
 20 import org.jfree.chart.servlet.ServletUtilities;
 21 import org.jfree.chart.title.TextTitle;
 22 import org.jfree.data.category.DefaultCategoryDataset;
 23 
 24 import org.springframework.stereotype.Controller;
 25 import org.springframework.beans.factory.annotation.Autowired;
 26 import org.springframework.web.bind.annotation.RequestMapping;
 27 import org.springframework.web.bind.annotation.ResponseBody;
 28 
 29 import com.alibaba.fastjson.JSON;
 30 import com.mvc.po.User;
 31 import com.mvc.service.UserService;
 32 
 33 @Controller
 34 public class UserController {
 35 
 36     @Autowired
 37     private UserService userService;
 38 
 39     @RequestMapping("getChart.do")  
 40    public @ResponseBody String getChart(HttpServletRequest request) throws Exception{  
 41         
 42         //1. 获得数据集合  
 43         DefaultCategoryDataset dataset = new DefaultCategoryDataset();
 44         List<Map<String, Object>> list = userService.query();
 45         Map<String, Object> map = new HashMap<String, Object>();
 46        
 47         for(int i = 0; i < list.size(); i++){
 48             map=list.get(i);
 49             dataset.addValue(Double.parseDouble(map.get("orderMoney").toString()), "订单金额", map.get("orderDate").toString());
 50         }
 51        
 52        //2. 创建柱状图  
 53         JFreeChart chart = ChartFactory.createLineChart("订单情况", // 图表标题  
 54                "日期", // 目录轴的显示标签  
 55                "金额", // 数值轴的显示标签  
 56                dataset, // 数据集  
 57                PlotOrientation.VERTICAL, // 图表方向：水平、垂直  
 58                false, // 是否显示图例(对于简单的柱状图必须是false)  
 59                true, // 是否生成工具  
 60                true // 是否生成URL链接  
 61                ); 
 62         
 63        //3. 设置整个柱状图的颜色和文字（char对象的设置是针对整个图形的设置）  
 64        chart.setBackgroundPaint(ChartColor.WHITE); // 设置总的背景颜色 
 65        chart.getLegend(0).setItemFont(new Font("宋体",Font.BOLD,20));
 66        chart.getLegend(0).setItemPaint(Color.BLUE);
 67        
 68        //4. 获得图形对象，并通过此对象对图形的颜色文字进行设置  
 69        CategoryPlot p = chart.getCategoryPlot();// 获得图表对象  
 70        p.setNoDataMessage("当前没有数据统计！");
 71        p.setNoDataMessagePaint(Color.RED);
 72        p.setNoDataMessageFont(new Font("宋体",Font.BOLD,20));
 73        p.setBackgroundPaint(ChartColor.WHITE);//图形背景颜色  
 74        p.setRangeGridlinePaint(ChartColor.DARK_GREEN);//图形表格颜色  
 75        p.setDomainGridlinesVisible(true);  //设置背景网格线是否可见
 76        p.setDomainGridlinePaint(Color.GRAY); //设置背景竖网格线颜色
 77        p.setRangeGridlinePaint(Color.GRAY); //设置背景横网格线颜色
 78        
 79        //显示节点数据
 80        LineAndShapeRenderer renderer = (LineAndShapeRenderer) p.getRenderer();
 81        renderer.setBaseItemLabelsVisible(true);
 82        renderer.setBaseShapesFilled(true);
 83        renderer.setBaseItemLabelsVisible(true);
 84        renderer.setBaseItemLabelGenerator(new StandardCategoryItemLabelGenerator());
 85        renderer.setBaseItemLabelFont(new Font("Dialog", 1, 14));
 86        p.setRenderer(renderer);
 87        
 88        //5.解决乱码问题  
 89        //(1)图形标题文字设置  
 90        TextTitle textTitle = chart.getTitle();     
 91        textTitle.setFont(new Font("宋体",Font.BOLD,20));
 92        textTitle.setPaint(Color.BLACK);
 93          
 94        //(2)图形X轴坐标文字的设置  
 95        CategoryPlot cPlot = (CategoryPlot) chart.getPlot();  
 96        chart.getRenderingHints().put(RenderingHints.KEY_TEXT_ANTIALIASING, RenderingHints.VALUE_TEXT_ANTIALIAS_OFF);
 97        CategoryAxis axis = cPlot.getDomainAxis();  
 98        axis.setLabelFont(new Font("宋体",Font.BOLD,15));  //设置X轴坐标上标题的文字  
 99        axis.setLabelPaint(Color.BLACK);
100        axis.setTickLabelFont(new Font("宋体",Font.BOLD,12));  //设置X轴坐标上的文字
101        axis.setTickLabelPaint(Color.BLACK); 
102          
103        //(3)图形Y轴坐标文字的设置  
104        ValueAxis valueAxis = cPlot.getRangeAxis();  
105        valueAxis.setLabelFont(new Font("宋体",Font.BOLD,15));  //设置Y轴坐标上标题的文字  
106        valueAxis.setLabelPaint(Color.BLACK);
107        valueAxis.setTickLabelFont(new Font("sans-serif",Font.BOLD,12));//设置Y轴坐标上的文字  
108        valueAxis.setTickLabelPaint(Color.BLACK);
109        
110        //6. 将图形转换为图片，传到前台  
111        String fileName = ServletUtilities.saveChartAsJPEG(chart, 700, 400, null, request.getSession());  
112        String chartURL=request.getContextPath() + "/chart?filename="+fileName; 
113             
114        return JSON.toJSONString(chartURL);
115    }