用Struts2生成Open Flash Chart 2图表数据

准备以下开源项目：
1. Struts 2.1.6
2. Open Flash Chart 2 Version 2 Lug Wyrm Charmer (28th, July 2009)
3. jofc2，这东西不知道是没做好还是什么意思，好像和ofc2不怎么匹配，最好下源码，有什么问题直接改。
4. log4j

用eclipse新建动态网站，取名OFC2Demo，将Struts2 lib目录下commons-fileupload-1.2.1.jar、commons-logging-1.0.4.jar、freemarker-2.3.13.jar、ognl-2.6.11.jar、struts2-core-2.1.6.jar、xstream-1.3.1.jar和xwork-2.1.2.jar、log4j.jar复制到WebContent\lib目录下。

使用svn下载jofc2源码，http://jofc2.googlecode.com/svn/trunk/，将下载后的src目录下的jofc2整个目录和下级内容全部复制到项目src目录下。

在web.xml中加入struts2拦截器

<!--<br /> <br /> Code highlighting produced by Actipro CodeHighlighter (freeware)<br /> http://www.CodeHighlighter.com/<br /> <br /> --><?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="WebApp_ID" version="2.5">
  <display-name>OFC2Demo</display-name>

  <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>

  <welcome-file-list>
    <welcome-file>index.html</welcome-file>
    <welcome-file>index.htm</welcome-file>
    <welcome-file>index.jsp</welcome-file>
    <welcome-file>default.html</welcome-file>
    <welcome-file>default.htm</welcome-file>
    <welcome-file>default.jsp</welcome-file>
  </welcome-file-list>
</web-app>

在返回jofc2生成Open Flash Chart数据时，本来想用jsonplugin插件，但发现序列化jofc2的Chart对象时，许多元素名称和Chart.toString()不同，这使得Open Flash Chart解析数据时不认识。所以需增加一个Struts2自定义Result Type，步骤如下：
新建类，OFC2Plugin

<!--<br /> <br /> Code highlighting produced by Actipro CodeHighlighter (freeware)<br /> http://www.CodeHighlighter.com/<br /> <br /> -->package com.xy.strutsplugin;

import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.http.HttpServletResponse;

import jofc2.model.Chart;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.struts2.StrutsStatics;

import com.opensymphony.xwork2.ActionContext;
import com.opensymphony.xwork2.ActionInvocation;
import com.opensymphony.xwork2.Result;
import com.opensymphony.xwork2.util.ValueStack;

public class OFC2Result implements Result {
    private static final long serialVersionUID = 6881760833309063964L;
    private static final Log log = LogFactory.getLog(OFC2Result.class);

    public void execute(ActionInvocation invocation) throws Exception {
        ActionContext actionContext = invocation.getInvocationContext();
        HttpServletResponse response = (HttpServletResponse) actionContext
                .get(StrutsStatics.HTTP_RESPONSE);
        
        try {
            ValueStack stack = invocation.getStack();
            Chart chart = (Chart)stack.findValue("ofcChart");
            
            response.setContentType("application/json-rpc;charset=utf-8");
            response.setHeader("Cache-Control", "no-cache");
            response.setHeader("Expires", "0");
            response.setHeader("Pragma", "No-cache");
            
            PrintWriter out = response.getWriter();
            log.debug(chart.toString());
            out.print(chart.toString());
        } catch (IOException exception) {
            log.error(exception.getMessage(), exception);
            throw exception;
        }
    }
}

在src下新建struts-plugin.xml

<!--<br /> <br /> Code highlighting produced by Actipro CodeHighlighter (freeware)<br /> http://www.CodeHighlighter.com/<br /> <br /> --><?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>
    <package name="ofc2-default" extends="struts-default">
        <result-types>
            <result-type name="ofc2" class="com.xy.strutsplugin.OFC2Result"/>
        </result-types>
    </package>
</struts>

配置log4j，以查看json输出信息。
在src下增加两个文件
commons-logging.properties

<!--<br /> <br /> Code highlighting produced by Actipro CodeHighlighter (freeware)<br /> http://www.CodeHighlighter.com/<br /> <br /> -->## set Log as Log4j
org.apache.commons.logging.Log=org.apache.commons.logging.impl.Log4JLogger

log4j.properties

<!--<br /> <br /> Code highlighting produced by Actipro CodeHighlighter (freeware)<br /> http://www.CodeHighlighter.com/<br /> <br /> --># This is the configuring for logging displayed in the Application Server
log4j.rootCategory=DEBUG,stdout

#stdout configure
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern= %d %p [%c] - <%m>%n

##
log4j.logger.com.xy.strutsplugin.OFC2Result=DEBUG

好了，现在将ofc所需的包添加到项目中
在WebContent目录下添加文件夹ofc2，将open-flash-chart-2-Lug-Wyrm-Charmer目录下的open-flash-chart.swf和js目录复制到新建的ofc2目录下。

演示Line Chart
在Action层增加类LineAction

<!--<br /> <br /> Code highlighting produced by Actipro CodeHighlighter (freeware)<br /> http://www.CodeHighlighter.com/<br /> <br /> -->package com.xy.action;

import java.text.DateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
import java.util.Locale;

import jofc2.model.Chart;
import jofc2.model.elements.LineChart;
import jofc2.model.axis.YAxis;
import jofc2.model.Text;

import com.opensymphony.xwork2.ActionSupport;

public class LineAction extends ActionSupport{
    private static final long serialVersionUID = -5759373192727732648L;
    
    private Chart ofcChart;
    public Chart getOfcChart() {
        return ofcChart;
    }
    
    public String dot(){
        List<LineChart.Dot> data1=new ArrayList<LineChart.Dot>()
                , data2=new ArrayList<LineChart.Dot>()
                , data3=new ArrayList<LineChart.Dot>();
        for(double i=0;i<6.2;i+=0.2){
            // line 1 dot
            LineChart.Dot dot1 = new LineChart.Dot(Math.sin(i)*1.9+10);
            dot1.setDotSize(5);            // 点大小
            dot1.setColour("#f00000");    // 设置点颜色
            data1.add(dot1);
            
            // line 2 dot
            LineChart.Dot dot2 = new LineChart.Dot(Math.sin(i)*1.9+7);
            dot2.setDotSize(3);
            dot2.setHaloSize(1);        // 点外空白大小
            dot2.setColour("#3D5C56");
            data2.add(dot2);
            
            // line 3 dot
            LineChart.Dot dot3 = new LineChart.Dot(Math.sin(i)*1.9+4);
            dot3.setDotSize(4);
            dot3.setHaloSize(2);
            data3.add(dot3);
        }
        
        Date date = new Date();
        Locale locale = new Locale("zh","CN");
        DateFormat dateFormat = DateFormat.getDateInstance(DateFormat.FULL, locale);
        
        // line 1
        LineChart line1 = new LineChart();
        line1.setDotStyle(new LineChart.Style(LineChart.Style.Type.DOT));
        line1.setWidth(1);            // 线宽
        line1.addDots(data1);        // 增加数据
        
        // line 2
        LineChart line2 = new LineChart();
        line2.setDotStyle(new LineChart.Style(LineChart.Style.Type.DOT));
        line2.setColour("#3D5C56");
        line2.setWidth(2);
        line2.addDots(data2);
        
        // line3
        LineChart line3 = new LineChart();
        line3.setDotStyle(new LineChart.Style(LineChart.Style.Type.DOT));
        line3.setWidth(6);
        line3.addDots(data3);
        
        YAxis y = new YAxis();
        y.setRange(0, 15, 5);        // 设置Y柚范围，参数依次为最小值、最大值、间隔

        ofcChart = new Chart();
        ofcChart.setTitle(new Text(dateFormat.format(date)));    // 设置标题
        ofcChart.addElements(line1);                            // 增加线到图表
        ofcChart.addElements(line2);
        ofcChart.addElements(line3);
        ofcChart.setYAxis(y);                                    // 设置Y柚
        
        return SUCCESS;
    }
}

增加struts配置文件

<!--<br /> <br /> Code highlighting produced by Actipro CodeHighlighter (freeware)<br /> http://www.CodeHighlighter.com/<br /> <br /> --><?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>
    <package name="ofc2" extends="ofc2-default">
       <action name="line" class="com.xy.action.LineAction">
         <result type="ofc2"/>
       </action>
    </package>
</struts>

在WebContent目录下增加line目录，目录下增加dot.html，对应官方示例Line Dot，dot.html内容如下：

<!--<br /> <br /> Code highlighting produced by Actipro CodeHighlighter (freeware)<br /> http://www.CodeHighlighter.com/<br /> <br /> --><!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Line Dot</title>

<script type="text/javascript" src="../jquery/jquery.js"></script>
<script type="text/javascript" src="../ofc2/js/swfobject.js"></script>

<script type="text/javascript" language="javascript">
    $(document).ready(function(){
        swfobject.embedSWF("../ofc2/open-flash-chart.swf", 
                    "chart", "550", "300", "9.0.0",
                    "expressInstall.swf",
                    {"data-file":"line!dot"});
    });
</script> 
</head>
<body>
    <div id="chart"></div>
</body>
</html>

这里用到了一点jquery的东西，请把jquery的包增加到相应目录下。

运行Tomcat，浏览器输入http://localhost:8080/OFC2Demo/line/dot.html，出下如下图表