JFreechart web示例

JFreechart柱状图在springMVC中的实现

java公共代码

import java.awt.Font;

import javax.servlet.ServletContext;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.jfree.chart.ChartFactory;
import org.jfree.chart.JFreeChart;
import org.jfree.chart.axis.CategoryAxis;
import org.jfree.chart.axis.ValueAxis;
import org.jfree.chart.plot.CategoryPlot;
import org.jfree.chart.plot.PlotOrientation;
import org.jfree.chart.servlet.ServletUtilities;
import org.jfree.data.category.DefaultCategoryDataset;

/**
* <JFreechart公共类>
* <功能详细描述>
* @author  zwq
* @version  [版本号, 2012-5-30]
* @see  [相关类/方法]
* @since  [产品/模块版本]
*/
public class CreateJFreechartUtil
{
    public String setImages(HttpServletRequest request, HttpServletResponse response)
        throws Exception
    {
        DefaultCategoryDataset dataset = getDataSet();
        JFreeChart chart = ChartFactory.createBarChart3D(
                        "水果产量图", //图表标题
            "水果", //目录轴的显示标签
            "产量", //数值轴的显示标签
            dataset, //数据集
            PlotOrientation.VERTICAL, //图表方向：水平、垂直
            true, //是否显示图例（对于简单的柱状图必须是false）
            false, //是否生成工具
            false //是否生成URL链接
        );
        //解决乱码问题
        setImageFont(chart);
       
        //生成图片
        String filename = ServletUtilities.saveChartAsPNG(chart, 600, 400, null, request.getSession());
       
        ServletContext servlet = request.getServletContext();
       
        //得到功能路径
        String imagePath_area = servlet.getContextPath() + "/servlet/DisplayChart?filename=" + filename;
       
        return imagePath_area;
    }
   
    /**
     * 解决乱码问题
     */
    private void setImageFont(JFreeChart chart)
    {
        CategoryPlot plot = (CategoryPlot)chart.getPlot();
        CategoryAxis domainAxis = plot.getDomainAxis();
        ValueAxis numberaxis = plot.getRangeAxis();
       
        //设置标题文字
        chart.getTitle().setFont(new Font("宋体", Font.BOLD, 12));
       
        //设置X轴坐标上的文字   
        domainAxis.setTickLabelFont(new Font("黑体", Font.PLAIN, 11));
       
        //设置X 轴的标题文字 
        domainAxis.setLabelFont(new Font("宋体", Font.PLAIN, 12));
       
        //设置Y 轴坐标上的文字  
        numberaxis.setTickLabelFont(new Font("sans-serif", Font.PLAIN, 12));
       
        //设置Y 轴的标题文字
        numberaxis.setLabelFont(new Font("黑体", Font.PLAIN, 12));
       
        //设置底部文字
        chart.getLegend().setItemFont(new Font("宋体", Font.PLAIN, 12));
    }
   
    /**
     * 获取一个组合数据集对象
     * @return
     */
    private DefaultCategoryDataset getDataSet()
    {
        DefaultCategoryDataset dataset = new DefaultCategoryDataset();
       
        dataset.addValue(100, "北京", "苹果");
        dataset.addValue(120, "上海", "苹果");
        dataset.addValue(380, "广州", "苹果");
        dataset.addValue(230, "北京", "梨子");
        dataset.addValue(200, "上海", "梨子");
        dataset.addValue(230, "广州", "梨子");
        dataset.addValue(400, "北京", "葡萄");
        dataset.addValue(300, "上海", "葡萄");
        dataset.addValue(500, "广州", "葡萄");
        return dataset;
    }
}

Spring Controller 调用

@RequestMapping("/getAllReportRule")
    public ModelAndView getAllReportRule(HttpServletRequest request, HttpServletResponse response,
        ReportRuleInfo reportRule) throws Exception
    {
        //创建CreateJFreechartUtil对象，调用setImages方法得到图片
        CreateJFreechartUtil createJfreechart = new CreateJFreechartUtil();
        String file = createJfreechart.setImages(request, response);
       
        List<ReportRuleInfo> reportList = reportService.getAllReportRule(reportRule);
        request.setAttribute("reportList", reportList);
        request.setAttribute("report", reportRule);
       
        //把得到的图片放到request范围里面
        request.setAttribute("file", file);
        return new ModelAndView("warning/report_rule_list");
    }

web.xml 配置

<servlet>
<servlet-name>jfreechart</servlet-name>
<servlet-class>org.jfree.chart.servlet.DisplayChart</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>jfreechart</servlet-name>
<url-pattern>/servlet/DisplayChart</url-pattern>
</servlet-mapping>

jsp 显示

<body>
<table width="99%" cellpadding="0" cellspacing="0" border="0"
align="center">
<tr>
<td>
<img alt="abc" src="${file}">
</td>
</tr>
</table>
</body>

评论

1 楼 布衣凌宇 2014-12-23  

为什么会报java.lang.ClassNotFoundException: org.jfree.data.category.CategoryDataset这个错误呢