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统计图表ChartDirector在Servlet和Struts2中的应用

    博客分类：
  • Java
ServletCC++C#JSP 
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1、公共配置
a.把ChartDirector.jar放到\webapp\WEB-INF\lib下面，并加入以下包： 
	<dependency>
    	<groupId>javax.servlet</groupId>
    	<artifactId>servlet-api</artifactId>
    	<version>2.5</version>
    	<type>jar</type>
    	<scope>provided</scope>
    </dependency>

b.在web.xml加入以下代码: 
	<servlet>
		<servlet-name>GetSessionImage</servlet-name>
		<servlet-class>ChartDirector.GetSessionImage</servlet-class>
	</servlet>
	<servlet-mapping>
		<servlet-name>GetSessionImage</servlet-name>
		<url-pattern>*.chart</url-pattern>
	</servlet-mapping>

c.把chartdir.lic文件在\src\main\java下面，其内容如下: 
	SXZVFNRN9MZ9L8LGA0E2B1BB


2、编写Servlet代码
a.web.xml加入以下代码： 
	<servlet>
		<servlet-name>BarChartServlet</servlet-name>
		<servlet-class>sample.servlet.BarChartServlet</servlet-class>
	</servlet>
	<servlet-mapping>
		<servlet-name>BarChartServlet</servlet-name>
		<url-pattern>/barchart</url-pattern>
	</servlet-mapping>

b.Servlet代码如下： 
	public class BarChartServlet extends HttpServlet {
	
		public void doGet(HttpServletRequest request, HttpServletResponse response)
				throws ServletException, IOException {
			// The data for the bar chart
			double[] data = { 85, 156, 179.5, 211, 123 };

			// The labels for the bar chart
			String[] labels = { "Mon", "Tue", "Wed", "Thu", "Fri" };

			// Create a XYChart object of size 250 x 250 pixels
			XYChart c = new XYChart(250, 250);

			// Set the plotarea at (30, 30) and of size 200 x 190 pixels
			c.setPlotArea(30, 30, 200, 190);

			// Add a bar chart layer using the given data
			c.addBarLayer(data);

			// Set the x axis labels using the given labels
			c.xAxis().setLabels(labels);

			request.getSession().setAttribute("chart1", c.makeChart2(Chart.PNG));
			String chart1URL = "img=chart1&id=" + System.currentTimeMillis();

			// include tool tip for the chart
			String imageMap1 = c.getHTMLImageMap("#", "",
					"title='{xLabel}: US${value}K'");

			response.setContentType("text/html");
			ServletOutputStream out = response.getOutputStream();
			out.println("<html>");
			out.println("<body>");
			out.print("<img src=\"getchart.chart?");
			out.print(chart1URL);
			out.println("\" usemap=\"#map1\" border=\"0\">");
			out.println("<map name=\"map1\">");
			out.println(imageMap1);
			out.println("</map>");
			out.println("</body>");
			out.println("</html>");
		}
	}


3、编写Action代码
a.Action代码如下： 
	public class ChartAction extends BaseAction {

		Logger logger = Logger.getLogger(ChartAction.class);

		@Action(value = "/barchart", results = { 
			@Result(name = "success", location = "/index.jsp") 
		})
		public String barchart() {
			// The data for the bar chart
			double[] data = { 85, 156, 179.5, 211, 123 };

			// The labels for the bar chart
			String[] labels = { "Mon", "Tue", "Wed", "Thu", "Fri" };

			// Create a XYChart object of size 250 x 250 pixels
			XYChart c = new XYChart(250, 250);

			// Set the plotarea at (30, 30) and of size 200 x 190 pixels
			c.setPlotArea(30, 30, 200, 190);

			// Add a bar chart layer using the given data
			c.addBarLayer(data);

			// Set the x axis labels using the given labels
			c.xAxis().setLabels(labels);

			getRequest().getSession().setAttribute("chart1",
					c.makeChart2(Chart.PNG));
			String chart1URL = "img=chart1&id=" + System.currentTimeMillis();

			// include tool tip for the chart
			String imageMap1 = c.getHTMLImageMap("#", "",
					"title='{xLabel}: US${value}K'");
			getRequest().setAttribute("chart1URL", chart1URL);
			getRequest().setAttribute("imageMap1", imageMap1);
			
			return SUCCESS;
		}
	}

b.index.jsp页面代码如下： 
	<div>
		<img border="0" usemap="#map1" src="getchart.chart?${chart1URL}">
		<map name="map1">
			${imageMap1}
		</map>
	</div>


4、配置说明
关于图片的显示方法可以根据自己的需求。我在Servlet和Action中采用了两种方法。另外提醒一下，如果改用jsp时，记得把getchat.jsp放到webapp下面。

5、显示结果如下：
  • 大小: 1.4 KB
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