JSP+Struts2+JFreeChart显示图表+鼠标事件

Struts2+JFreeChart使用的是Struts2的返回类型来显示图片，但是在页面貌似没有鼠标事件，此方式可参考这篇：
1、http://liyanboss.iteye.com/blog/181282
2、http://www.cnblogs.com/over140/articles/971663.html
以下JSP+Struts2+JFreeChart是能显示鼠标事件的，但是不是Struts2的返回类型，以下是实现。
action:

package action;

import java.awt.Rectangle;
import java.awt.Shape;
import java.io.IOException;
import java.io.PrintWriter;

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

import org.apache.struts2.ServletActionContext;
import org.jfree.chart.ChartFactory;
import org.jfree.chart.ChartRenderingInfo;
import org.jfree.chart.ChartUtilities;
import org.jfree.chart.JFreeChart;
import org.jfree.chart.entity.ChartEntity;
import org.jfree.chart.entity.StandardEntityCollection;
import org.jfree.chart.plot.PlotOrientation;
import org.jfree.chart.servlet.ServletUtilities;
import org.jfree.data.category.DefaultCategoryDataset;

import com.opensymphony.xwork2.ActionSupport;

public class LoginAction extends ActionSupport{
	//页面鼠标事件时需要的参数
	private String hy_filename;
	/**
	 * 显示图片
	 * @return
	 */
	public String show(){
		HttpServletRequest req = ServletActionContext.getRequest();
		HttpServletResponse res = ServletActionContext.getResponse();
		hy_filename = createChartImage(req, res);
		return SUCCESS;
	}
	
	private String createChartImage(HttpServletRequest req, HttpServletResponse res){
		JFreeChart chart = createChart(createData());
		String filename = createUseMap(chart, 510, 300, req, res);
		return filename;
	}
	
	private JFreeChart createChart(DefaultCategoryDataset defaultcategorydataset){
		JFreeChart chart = ChartFactory.createLineChart(null, //图形标题名称
		null,  					    //domain轴 Lable,横坐标Lable
		null, 					    //range 轴 Lable,纵坐标Lable
		defaultcategorydataset,		// dataset
		PlotOrientation.VERTICAL,	//垂直显示
		true,						// legend?
		true,						// tooltips?
		false);	 					//URLs?
		return chart;
	}
	
	private String createUseMap(JFreeChart chart, int width, int height, HttpServletRequest req, HttpServletResponse res){
		//在矩形框中显示信息
	    Shape shape = new Rectangle(20, 10);
	    ChartEntity entity = new ChartEntity(shape);
	    StandardEntityCollection coll = new StandardEntityCollection();
	    coll.add(entity);
	    //该工具类上面没有介绍，在鼠标移动到图片时显示提示信息是用Map实现的，这些Map是用该类生成的。
	    ChartRenderingInfo info = new ChartRenderingInfo(coll);
	    PrintWriter pw;
	    String filename = null;
		try {
			res.setContentType("text/html;charset=utf-8");
			res.setCharacterEncoding("utf-8");
			pw = res.getWriter();//输出MAP信息 
		    //写入到输出流生成图像文件，同时把图片的具体信息放入ChartRenderingInfo的一个实例为以后生成Map提供信息 
		    //ChartUtilities.writeChartAsPNG(out, chart, width, height, info);
		    filename = ServletUtilities.saveChartAsPNG(chart, width , height, info, req.getSession());//保存图表为文件
		    //读取info对象，生成Map信息。这些信息写在pw的输出流中，这里的输出流就是Response.out，也就是直接输出到页面了
		    ChartUtilities.writeImageMap(pw, filename, info, false);
		    pw.flush();

		} catch (IOException e) {
			e.printStackTrace();
		}
		return filename;
	}
	
	private DefaultCategoryDataset createData(){
		String series1 = "血糖";
		String series2 = "舒张压";
		String series3 = "收缩压";
		String type1 = "2009-01-01";
		String type2 = "2009-02-01";
		String type3 = "2009-03-01";
		String type4 = "2009-04-01";
		String type5 = "2009-05-01";
		String type6 = "2009-06-01";
		String type7 = "2009-07-01";
		String type8 = "2009-08-01";
		DefaultCategoryDataset defaultcategorydataset = new DefaultCategoryDataset();
		defaultcategorydataset.addValue(1.0D, series1, type1);
		defaultcategorydataset.addValue(2D, series1, type2);
		defaultcategorydataset.addValue(3D, series1, type3);
		defaultcategorydataset.addValue(5D, series1, type4);
		defaultcategorydataset.addValue(5D, series1, type5);
		defaultcategorydataset.addValue(7D, series1, type6);
		defaultcategorydataset.addValue(7D, series1, type7);
		defaultcategorydataset.addValue(8D, series1, type8);

		defaultcategorydataset.addValue(5D, series2, type1);
		defaultcategorydataset.addValue(7D, series2, type2);
		defaultcategorydataset.addValue(6D, series2, type3);
		defaultcategorydataset.addValue(8D, series2, type4);
		defaultcategorydataset.addValue(4D, series2, type5);
		defaultcategorydataset.addValue(4D, series2, type6);
		defaultcategorydataset.addValue(2D, series2, type7);
		defaultcategorydataset.addValue(1.0D, series2, type8);
		return defaultcategorydataset;
	}

	public String getHy_filename() {
		return hy_filename;
	}

	public void setHy_filename(String hy_filename) {
		this.hy_filename = hy_filename;
	}
}

页面：index.jsp

<%@ taglib prefix="s" uri="/struts-tags"%>
<%@ page language="java" import="java.util.*" contentType="text/html;charset=utf-8" pageEncoding="utf-8"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <title>JfreeChartTest</title>
    <meta http-equiv="pragma" content="no-cache">
    <meta http-equiv="cache-control" content="no-cache">
  </head>
  <body>
	<P ALIGN="center"> 
	 有鼠标事件：
	<img src="<%=request.getContextPath() %>/servletDisplayChart?filename=<s:property value='hy_filename'/>" usemap="#<s:property value='hy_filename'/>" border="0"> 
	无鼠标事件：
	<img src="<%=request.getContextPath() %>/servletDisplayChart?filename=<s:property value='hy_filename'/>" border="0"> 
	</P> 
  </body>
</html>

struts.xml:
加上以下内容：
<action name="show" method="show" class="action.LoginAction">
      <result>index.jsp</result>
      <interceptor-ref name="defaultStack"/>
</action>

web.xml:
加上以下内容：

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

运行效果：
访问：http://localhost:8080/工程名/show.action

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评论

4 楼 easonfans 2014-03-29  

woweipingzui 写道

和2楼一样的错...该怎么解决

不好意思，很久不顾到了，是不是类没加载全啊，你们再看看吧
很久不碰技术了。。。

3 楼 woweipingzui 2014-03-28  

和2楼一样的错...该怎么解决

2 楼 blackproof 2011-03-05  

为什么总是在启动服务器tomcat的时候报错：
严重: Exception starting filter struts2
java.lang.NoClassDefFoundError: org/jfree/data/category/CategoryDataset

我已经加载了struts的JFreechart的插件了

1 楼 easonfans 2010-12-17  

谢谢你，你这个很明了！