项目中要统计分析,就要使用图表了。开源的工具实在是太多了,最终决定使用jfreechart。虽然是开源的,但是他的guide却需要购买,在网络中也没有搜索到,先找了几个demo运行了一下,感觉还算好用。就是数据集,JFreeChart,最后输出。
现在把struts中如何使用帖给大家(以饼图为例,其它类似):
主要就是formbean中的代码
- public DefaultPieDataset getDataSet() {
- DefaultPieDataset dataset = new DefaultPieDataset();
- HashMap params = this.initParamMaps();
- if (dispatchService.searchDispatchsCount(params) != 0) {
- Map search = dispatchService.searchDispatchsAsSums(params);
- dataset.setValue(getMessage2("adcf"), Double.parseDouble(search.get("ADCF").toString()));
- dataset.setValue(getMessage2("adcz"), Double.parseDouble(search.get("ADCZ").toString()));
- dataset.setValue(getMessage2("ayzf"), Double.parseDouble(search.get("AYZF").toString()));
- dataset.setValue(getMessage2("alkf"), Double.parseDouble(search.get("ALKF").toString()));
- dataset.setValue(getMessage2("aztf"), Double.parseDouble(search.get("AZTF").toString()));
- dataset.setValue(getMessage2("acff"), Double.parseDouble(search.get("ACFF").toString()));
- dataset.setValue(getMessage2("atxf"), Double.parseDouble(search.get("ATXF").toString()));
- dataset.setValue(getMessage2("azbg"), Double.parseDouble(search.get("AZBG").toString()));
- dataset.setValue(getMessage2("aact"), Double.parseDouble(search.get("AACT").toString()));
- dataset.setValue(getMessage2("audc"), Double.parseDouble(search.get("AUDC").toString()));
- }
- return dataset;
- }
- public String dispatchChart() {
- DefaultPieDataset data = getDataSet();
- JFreeChart chart = ChartFactory.createPieChart3D("派车费用统计", // 图表标题
- data, true, // 是否显示图例
- false, false);
- PiePlot pieplot = (PiePlot) chart.getPlot();
- pieplot.setNoDataMessage("没有数据");
- HttpSession session = ActionContext.getActionContext().getRequest()
- .getSession();
- HttpServletRequest request = ActionContext.getActionContext()
- .getRequest();
- try {
- String filename = ServletUtilities.saveChartAsPNG(chart, 700, 450,null, session);
- pieUrl = request.getContextPath()+ "/servlet/DisplayChart?filename=" + filename;
- } catch (IOException e) {
- e.printStackTrace();
- }
- return SUCCESS;
- }
最后是配置DisplayChart这个Servlet
- <servlet-mapping>
- <servlet-name>Connector</servlet-name>
- <url-pattern>/editor/editor/filemanager/browser/default/connectors/jsp/connector</url-pattern>
- </servlet-mapping>
- <servlet-mapping>
- <servlet-name>DisplayChart</servlet-name>
- <url-pattern>/servlet/DisplayChart</url-pattern>
- </servlet-mapping>
页面中使用 <img src="<bean:write name='dispatchBean' property='pieUrl'/>"/> 就可以了
要注意的是要引入jfreechart-1.0.5.jar和jcommon-1.0.9.jar两个jar包,开始的时候我多加入了gnujaxp.jar,一直出错,好像是spring的问题。
运行可以看到地址是图片的地址是http://localhost:8080/echance/servlet/DisplayChart?filename=jfreechart-1859.png
最后贴个图看看