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
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。
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：
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< 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 >
<?
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<! 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.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。"-//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 >
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;
}
}
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：
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;
}
}
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 >
"-//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 >
本文转自博客园农民伯伯的博客，原文链接：Struts2+JFreeChart，如需转载请自行联系原博主。
