struts2 jfreechart生成报表demo
转至 http://wangyu.iteye.com/blog/211266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):
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：
--------------------------------------------------------------------------------
补充
以上生成的图片是PNG格式的图片，如果需要自定义图片格式的话（好像只能支持JPG和PNG格式），那么自己写一个ChartResult继承自StrutsResultSupport，见代码：
package com.tangjun.struts2.chartresult;
import java.io.OutputStream;
import javax.servlet.http.HttpServletResponse;
import org.apache.struts2.ServletActionContext;
import org.apache.struts2.dispatcher.StrutsResultSupport;
import org.jfree.chart.ChartUtilities;
import org.jfree.chart.JFreeChart;
import com.opensymphony.xwork2.ActionInvocation;
public class ChartResult extends StrutsResultSupport {
/**
*
*/
private static final long serialVersionUID = 4199494785336139337L;
//图片宽度
private int width;
//图片高度
private int height;
//图片类型 jpg,png
private String imageType;
@Override
protected void doExecute(String arg0, ActionInvocation invocation) throws Exception {
JFreeChart chart =(JFreeChart) invocation.getStack().findValue("chart");
HttpServletResponse response = ServletActionContext.getResponse();
OutputStream os = response.getOutputStream();
if("jpeg".equalsIgnoreCase(imageType) || "jpg".equalsIgnoreCase(imageType))
ChartUtilities.writeChartAsJPEG(os, chart, width, height);
else if("png".equalsIgnoreCase(imageType))
ChartUtilities.writeChartAsPNG(os, chart, width, height);
else
ChartUtilities.writeChartAsJPEG(os, chart, width, height);
os.flush();
}
public void setHeight(int height) {
this.height = height;
}
public void setWidth(int width) {
this.width = width;
}
public void setImageType(String imageType) {
this.imageType = imageType;
}
}
如此的话还需要小小的修改一下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">
<!-- 自定义返回类型 -->
<result-types>
<!--
<result-type name="chart" class="org.apache.struts2.dispatcher.ChartResult"></result-type>
-->
<result-type name="chart" class="com.tangjun.struts2.chartresult.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>
-->
<result type="chart">
<param name="width">400</param>
<param name="height">300</param>
<param name="imageType">jpg</param>
</result>
</action>
</package>
</struts>
OK!显示的效果是一样的，只是图片格式不一样，当然这里面你可以做更多操作！
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