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struts2使用插件(jfreechart图表插件)

2013-10-11 22:55 453 查看

1.导入jar包:[jcommon-1.0.20.jar],[jfreechart-1.0.16.jar],[struts2-jfreechart-plugin-2.3.15.1.jar](struts2整合第三方插件的jar包,这里针对jfreechart,其他的去struts2下载的lib文件夹里找plugin结尾的jar包)

2.使用第三方插件的时候,在它们的jar包中肯定会提供一个struts-plugin.xml文件(这里再回顾下struts2加载配置文件的顺序,struts-default.xml--->struts-plugin.xml--->struts.xml),我们只要继承这个文件里他们定义的包,如果它有自定义的结果集,则使用它的结果集,写上他定义的参数即可。

struts2-jfreechart-plugin-2.3.15.1.jar中的struts-plugin.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!--
/*
* $Id: struts-plugin.xml 1221225 2011-12-20 12:22:28Z jogep $
*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements.  See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership.  The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License.  You may obtain a copy of the License at
*
*  http://www.apache.org/licenses/LICENSE-2.0 *
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied.  See the License for the
* specific language governing permissions and limitations
* under the License.
*/
-->
<!DOCTYPE struts PUBLIC
"-//Apache Software Foundation//DTD Struts Configuration 2.3//EN"
"http://struts.apache.org/dtds/struts-2.3.dtd">

<struts>
<package name="jfreechart-default" extends="struts-default">

<result-types>
<result-type name="chart" class="org.apache.struts2.dispatcher.ChartResult">
<param name="height">150</param>
<param name="width">200</param>
</result-type>
</result-types>
</package>

</struts>

例子:

struts.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC
"-//Apache Software Foundation//DTD Struts Configuration 2.3//EN"
"http://struts.apache.org/dtds/struts-2.3.dtd">

<struts>
<!-- 自动加载 -->
<constant name="struts.devMode" value="true" />
<!-- 使用简单主题 -->
<constant name="struts.ui.theme" value="simple"/>
<!-- 继承上面那个struts-plugin.xml文件定义的包 -->
<package name="myChart" extends="jfreechart-default">
<action name="myChart" class="com.xxc.action.GetChartAction">
<result type="chart"><!-- 开始我还以为这里这样写,那么返回success的时候就没法跳转到一个页面了,其实大可不必,只要在jsp里img标签的src属性写这个action路径就可以显示了 -->
<param name="height">450</param>
<param name="width">700</param>
</result>
</action>
</package>
</struts>

Action

public class GetChartAction extends ActionSupport implements Serializable{
private JFreeChart chart;

public String execute() throws Exception {
ValueAxis xAxis = new NumberAxis("年度");
ValueAxis yAxis = new NumberAxis("产值");
XYSeries xySeries = new XYSeries("绿豆");
xySeries.add(0,300);
xySeries.add(1,200);
xySeries.add(2,400);
xySeries.add(3,500);
xySeries.add(4,600);
xySeries.add(5,500);
xySeries.add(6,800);
xySeries.add(7,1000);
xySeries.add(8,1100);
XYSeriesCollection xyDataset = new XYSeriesCollection(xySeries);
XYPlot xyPlot = new XYPlot(xyDataset,xAxis,yAxis,new StandardXYItemRenderer(StandardXYItemRenderer.SHAPES_AND_LINES));
chart = new JFreeChart(xyPlot);
return SUCCESS;
}

public JFreeChart getChart() {
return chart;
}

public void setChart(JFreeChart chart) {
this.chart = chart;
}
}

显示的页面

<body>
<s:url action="myChart" var="url"></s:url>
<img alt="图表" src="<s:property value="#url"/>">
</body>

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