正题
下面以边帖图片和代码的方式来讲解Struts2与JFreeChart的整合。
搭建环境：首先帖一张工程的目录结构以及所需的jar包。注意:如果你不打算自己写ChartResult的话只需要引入struts2-jfreechart-plugin-2.0.6.jar(这个在struts-2.0.6-all.zip可以找到了):
注意：除去struts2需要的基本包外，Jfreechart所用到的包就是最下面的那三个！
1.依次帖web.xml、struts.xml、struts.properties和struts-jfreechart.xml几个配置文件的代码：
web.xml
<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.4"
xmlns="http://java.sun.com/xml/ns/j2ee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee
http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">
<filter>
<filter-name>struts2</filter-name>
<filter-class>
org.apache.struts2.dispatcher.FilterDispatcher
</filter-class>
</filter>
<filter-mapping>
<filter-name>struts2</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
</web-app>
struts.xml
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE struts PUBLIC
"-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
"http://struts.apache.org/dtds/struts-2.0.dtd">
<struts>
<include file="struts-jfreechart.xml" />
</struts>
struts.properties
struts.ui.theme=simple
struts-jfreechart.xml
<!DOCTYPE struts PUBLIC
"-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
"http://struts.apache.org/dtds/struts-2.0.dtd">
<struts>
<package name="jFreeChartDemonstration" extends="struts-default"
namespace="/jfreechart">
<result-types>
<result-type name="chart" class="org.apache.struts2.dispatcher.ChartResult"></result-type>
</result-types>
<action name="JFreeChartAction" class="com.tangjun.struts2.JFreeChartAction">
<result type="chart">
<param name="width">400</param>
<param name="height">300</param>
</result>
</action>
</package>
</struts>
说明：这里只需要说明下struts-jfreechart.xml，这里直接调用已经写好的类ChartResult，这个类是继承自
com.opensymphony.xwork2.Result,传入生成图片大小的参数width和height就可以了。
2. 新建JFreeChartAction继承ActionSupport,生成JFreeChart对象并保存到chart中，注意这个名称是固定的。
package com.tangjun.struts2;
import com.opensymphony.xwork2.ActionSupport;
import org.jfree.chart.ChartFactory;
import org.jfree.chart.JFreeChart;
import org.jfree.data.general.DefaultPieDataset;
public class JFreeChartAction extends ActionSupport {
/**
*
*/
private static final long serialVersionUID = 5752180822913527064L;
//供ChartResult调用->ActionInvocation.getStack().findValue("chart")
private JFreeChart chart;
@Override
public String execute() throws Exception {
//设置数据
DefaultPieDataset data = new DefaultPieDataset();
data.setValue("Java", new Double(43.2));
data.setValue("Visual Basic", new Double(1.0));
data.setValue("C/C++", new Double(17.5));
data.setValue("tangjun", new Double(60.0));
//生成JFreeChart对象
chart = ChartFactory.createPieChart("Pie Chart", data, true,true, false);
return SUCCESS;
}
public JFreeChart getChart() {
return chart;
}
public void setChart(JFreeChart chart) {
this.chart = chart;
}
}
OK！至此代码已经全部贴完。
输入访问 http://localhost:8080/Struts2JFreeChart/jfreechart/JFreeChartAction.action
显示结果如下：
