在网上看到Open Flash Chart的效果,口水啊,正好要做图表,就想试用看看,jFreeChart的效果实在太差,唉,可能我代码写的不好的缘故吧,责任应该不在jFreeChart,呵呵。
中间费了多少事情就不说了,下面说说步骤:
下载jofc2,下载地址是http://code.google.com/p/jofc2/,这个是google对OFC做扩展的包,以前有个ofc4j的项目,不过好像已经Freeze了。
当然要下载OFC,我下载的是http://www.ofc2dz.com/上的,貌似原生的ofc不支持json格式的数据,而这个支持。
把文件open-flash-chart.swf放到网站根目录,然后把swfobject.js放到js目录,把jofc2的jar放到WEB-INF/lib,注意需要把依赖包也加入,在jofc的lib目录下。
下面就可以开始了,页面上的代码(我这里加了jQuery的库):
$(document).ready(function(){
$('#viewbtn').bind('click',function(){
var url = 'CategoryRankImg.do?year=' + $('#year').val();
swfobject.embedSWF("<s:url value="/open-flash-chart.swf"/>", "chart", "550", "300", "9.0.0",
"expressInstall.swf",
{"data-file":url});
});
});
然后,在action中,即可用jofc2的类了:
private Chart flashChart;
public String draw(){
PieChart c2 = new PieChart(); //饼图
List<CompanyProperty> list = cppSvr.find(0,0);
for(CompanyProperty cpp : list){
List results = bkSvr.findByNamedQuery("bk.qryCateRank", Integer.parseInt(year),cpp.getId());
Long cnt = (Long)results.get(0);
c2.addSlice(cnt==null?0:cnt, cpp.getName()); //增加一块
}
c2.setStartAngle(-90); //开始的角度
c2.setColours(new String[] {
"0x336699", "0x88AACC", "0x999933", "0x666699",
"0xCC9933", "0x006666", "0x3399FF", "0x993300",
"0xAAAA77", "0x666666", "0xFFCC66", "0x6699CC",
"0x663366", "0x9999CC", "0xAAAAAA", "0x669999",
"0xBBBB55", "0xCC6600", "0x9999FF", "0x0066CC",
"0x99CCCC", "0x999999", "0xFFCC00", "0x009999",
"0x99CC33", "0xFF9900", "0x999966", "0x66CCCC",
"0x339966", "0xCCCC33" });//饼图每块的颜色
c2.setTooltip("#val# / #total#<br>占百分之 #percent#\n 角度 = #radius#"); //鼠标移动上去后提示内容
flashChart = new Chart("企业性质排序"+year + "年"); //整个图的标题
flashChart.addElements(c2); //把饼图加入到图表
return Action.SUCCESS;
}
其实在输出flashChart对象的时候,是输入一串json数据,但我不知道是不是和struts2的json plugin能够合起来,所以我自己写了一个ActionResult:
import java.io.PrintWriter;
import javax.servlet.http.HttpServletResponse;
import jofc2.model.Chart;
import org.apache.struts2.ServletActionContext;
import org.apache.struts2.dispatcher.StrutsResultSupport;
import com.opensymphony.xwork2.ActionInvocation;
public class FlashChartResult extends StrutsResultSupport{
private static final String ENCODING = "UTF-8";
/**
*
*/
private static final long serialVersionUID = 4702848904993212381L;
@Override
protected void doExecute(String str, ActionInvocation inv)throws Exception {
Chart chart = (Chart) inv.getStack().findValue("flashChart");
HttpServletResponse response = ServletActionContext.getResponse();
response.setContentType("application/json-rpc;charset=" + ENCODING);
response.setHeader("Cache-Control", "no-cache");
response.setHeader("Expires", "0");
response.setHeader("Pragma", "No-cache");
String json = chart.toString();
response.setContentLength(json.getBytes(ENCODING).length);
PrintWriter out = response.getWriter();
out.print(json);
out.flush();
out.close();
}
}
struts的配置内容:
<result-type name="ofc" class="com.nbrc.market.helper.FlashChartResult"></result-type>
……
<action name="PositionCateRank" class="PositionRankAction" method="query">
<result type="ofc"></result>
</action>
这样就大功告成了。
最后还要讲几句,这个jofc2的库源代码有,但是javadoc里很少有东西,所以写代码可能不太方便,需要慢慢摸索,我一天只做了饼图和条状图,条状图的代码:
public String query(){
if(marketId==null || marketId.equals("")){
return Action.NONE;
}
MarketPlan p = mrpSvr.findById(marketId);
planName = p.getTitle();
BarChart chart = new BarChart(BarChart.Style.GLASS);//设置条状图样式
Map<String, Long> result = rriSvr.getPositionCateRankByPlan(marketId,10);
long max = 0;//Y轴最大值
XAxis x = new XAxis();//X轴
for(String key:result.keySet()){
PositionCategory pc = pctSvr.findById(key);
Long tmp = result.get(key);
Bar bar = new Bar(tmp,pc.getPositionTitle()); //条标题,显示在x轴上
bar.setColour("0x336699"); //颜色
bar.setTooltip(pc.getPositionTitle()+"#val# 个岗位"); //鼠标移动上去后的提示
if(tmp>max){
max = tmp;
}
chart.addBars(bar);
x.addLabels(pc.getPositionTitle()); //x轴的文字
}
flashChart = new Chart();
flashChart.addElements(chart);
YAxis y = new YAxis(); //y轴
y.setMax(max+10.0); //y轴最大值
y.setSteps(max/10*1.0); //步进
flashChart.setYAxis(y);
flashChart.setXAxis(x);
return Action.SUCCESS;
}
最后还要注意,在传递参数的时候要把&符号转换成%26!切记切记,如
var url = 'SumCountChart.do?startTime=' + $('#startTime').val()+"%26endTime="+$('#endTime').val();
swfobject.embedSWF("<s:url value="/open-flash-chart.swf"/>", "chart", "550", "300", "9.0.0", "expressInstall.swf", {"data-file":url});