項目中要統計分析,就要使用圖表了。開源的工具實在是太多了,最終決定使用jfreechart。雖然是開源的,但是他的guide卻需要購買,在網絡中也沒有搜索到,先找了幾個demo運行了一下,感覺還算好用。就是數據集,JFreeChart,最後輸出。
現在把struts中如何使用帖給大家(以餅圖爲例,其它類似):
主要就是formbean中的代碼
- 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("派車費用統計", // 圖表標題
- data, true, // 是否顯示圖例
- false, false);
- PiePlot pieplot = (PiePlot) chart.getPlot();
- pieplot.setNoDataMessage("沒有數據");
- 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;
- }
最後是配置DisplayChart這個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>
頁面中使用 <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兩個jar包,開始的時候我多加入了gnujaxp.jar,一直出錯,好像是spring的問題。
運行可以看到地址是圖片的地址是http://localhost:8080/echance/servlet/DisplayChart?filename=jfreechart-1859.png
最後貼個圖看看