统计图表ChartDirector在Servlet和Struts2中的应用
1、公共配置
a.把ChartDirector.jar放到\webapp\WEB-INF\lib下面，并加入以下包：
b.在web.xml加入以下代码:
c.把chartdir.lic文件在\src\main\java下面，其内容如下:
2、编写Servlet代码
a.web.xml加入以下代码：
b.Servlet代码如下：
3、编写Action代码
a.Action代码如下：
b.index.jsp页面代码如下：
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：
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:
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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：