一、 利用基本的TABLE元素
本来页面上是用jfreechart 绘制的数据分析图。但是由于有个页面绘制的图比较多，而且是js选择性的展示哪张图，头说都用jfreechart效率太慢了，把那简单的柱状图，拿去改改（用简单点，而且不怎么占资源的方式）。我反复思量，反复研究，终于搞出个小东西。虽然没有什么技术含量，但是却觉得自己很有创意。全部都是用最简单的HTML 元素制作的，分享下：
1.效果截图
2.简单的代码：
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
2<html>
3<head>
4<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
5<title>Test</title>
6</head>
7
8<body>
9<table border=0 cellpadding=0 cellspacing=0>
10<tr>
11<td width=1 height=200 bgcolor=red></td>
12<td width=250><table width="245" border="0" cellspacing="0" align="right" >
13 <tr>
14 <td width="15" nowrap bgcolor="#FF0000"><font color="#FFFFFF"> </font></td>
15 <td width="42"> </td>
16 <td width="16"> </td>
17 <td width="41"> </td>
18 <td width="17"> </td>
19 <td width="42"> </td>
20 <td width="17"> </td>
21 <td width="39"> </td>
22 </tr>
23 <tr>
24 <td nowrap bgcolor="#FF0000"><font color="#FFFFFF"> </font></td>
25 <td> </td>
26 <td> </td>
27 <td> </td>
28 <td bgcolor="#33CCFF"> </td>
29 <td> </td>
30 <td> </td>
31 <td> </td>
32 </tr>
33 <tr>
34 <td nowrap bgcolor="#FF0000"><font color="#FFFFFF"> </font></td>
35 <td> </td>
36 <td> </td>
37 <td> </td>
38 <td bgcolor="#33CCFF"> </td>
39 <td> </td>
40 <td> </td>
41 <td> </td>
42 </tr>
43 <tr>
44 <td nowrap bgcolor="#FF0000"><font color="#FFFFFF"> </font></td>
45 <td> </td>
46 <td bgcolor="#000000"> </td>
47 <td> </td>
48 <td bgcolor="#33CCFF"> </td>
49 <td> </td>
50 <td> </td>
51 <td> </td>
52 </tr>
53 <tr>
54 <td nowrap bgcolor="#FF0000"><font color="#FFFFFF"> </font></td>
55 <td> </td>
56 <td bgcolor="#000000"> </td>
57 <td> </td>
58 <td bgcolor="#33CCFF"> </td>
59 <td> </td>
60 <td bgcolor="#FF9933"> </td>
61 <td> </td>
62 </tr>
63 <tr>
64 <td nowrap bgcolor="#FF0000"><font color="#FFFFFF"> </font></td>
65 <td> </td>
66 <td bgcolor="#000000"> </td>
67 <td> </td>
68 <td bgcolor="#33CCFF"> </td>
69 <td> </td>
70 <td bgcolor="#FF9933"> </td>
71 <td> </td>
72 </tr>
73 <tr>
74 <td nowrap bgcolor="#FF0000"><font color="#FFFFFF"> </font></td>
75 <td> </td>
76 <td bgcolor="#000000"> </td>
77 <td> </td>
78 <td bgcolor="#33CCFF"> </td>
79 <td> </td>
80 <td bgcolor="#FF9933"> </td>
81 <td> </td>
82 </tr>
83 <tr>
84 <td nowrap bgcolor="#FF0000"><font color="#FFFFFF"> </font></td>
85 <td> </td>
86 <td bgcolor="#000000"> </td>
87 <td> </td>
88 <td bgcolor="#33CCFF"> </td>
89 <td> </td>
90 <td bgcolor="#FF9933"> </td>
91 <td> </td>
92 </tr>
93</table></td>
94</tr>
95<tr><td colspan=2 height=1 bgcolor=red></td><tr>
96<table>
97</body>
98</html>
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100
如果只是需要在页面上现实一些柱状图，那么这种方式是非常简单和实用的。核心原理利用HTML的基本元素——table。绘制table，不显示其边框，不显示其间距，然后利用获得的数据，使用JS控制哪行哪列用什么颜色。
如：
document.getElementById('tab').rows[0].cells[0].bgColor = 'red';
二、立体感的柱状图
——这是在网上陶下来的漂亮代码
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<html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office">
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3
<!--[if !mso]>
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<style>
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v\:* { behavior: url(#default#VML) }
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o\:* { behavior: url(#default#VML) }
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.shape { behavior: url(#default#VML) }
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</style>
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<![endif]-->
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<HEAD>
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<TITLE>柱状图形报表样列</TITLE>
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<SCRIPT LANGUAGE="JavaScript">
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//addPole 增加一个柱状图
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//left 与窗口左边的距离
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//width 宽度
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//height 高度
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//zindex 层高度
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//fillcolor 主色
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//color 渐变色
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//type 默认为竖,1为横
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function addPole(left,top,width,height,zindex,fillcolor,color,type)
{
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top=top-height;
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var a="";
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if(type==1)
{
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a="angle='-90' focus='100%'";
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}
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var html="<v:rect style='position:absolute;";
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html=html+"left:"+left+"px;";
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html=html+"top:"+top+"px;";
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html=html+"width:"+width+"px;";
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html=html+"height:"+height+"px;";
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html=html+"z-index:"+zindex+"'";
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html=html+"fillcolor='"+fillcolor+"'>";
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html=html+"<v:fill color2='"+color+"'";
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html=html+" rotate='t' "+a+" type='gradient'/><o:extrusion v:ext='view' backdepth='20pt' ";
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html=html+"color='"+fillcolor+"' on='t'/></v:rect>";
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document.write(html);
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}
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//left 与窗口左边的距离
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//width 宽度
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//height 高度
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//zindex 立体高度
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//fillcolor 主色
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function addBackground(left,top,width,height,zindex,fillcolor)
{
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top=top-height;
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var html="<v:rect style='position:absolute;left:"+left+"px;";
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html=html+"top:"+top+"px;";
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html=html+"width:"+width+"px;";
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html=html+"height:"+height+"px;";
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html=html+"z-index:"+zindex+"'";
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html=html+"fillcolor='"+fillcolor+"'";
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html=html+" stroked='f'><v:fill rotate='t' angle='-45' focus='100%' type='gradient'/></v:rect>";
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document.write(html);
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}
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function addLine(zindex,from,to,color)
{
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var html="<v:line style='position:absolute;left:0;text-align:left;top:0;flip:y;z-index:"+zindex+"'";
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html=html+" from='"+from+"' to='"+to+"' strokecolor='"+color+"'/>"
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document.write(html);
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}
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function addText(left,top,width,height,zindex,value,fontsize)
{
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top=top-height;
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var html="<v:shape style='position:absolute;left:"+left+"px;";
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html=html+"top:"+top+"px;";
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html=html+"width:"+width+"px;";
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html=html+"height:"+height+"px;";
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html=html+"z-index:"+zindex+"'>";
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html=html+"<v:textbox inset='0px,0px,0px,0px'><table cellspacing='3' cellpadding='0' width='100%' height='100%'><tr><td";
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html=html+" style='FONT-SIZE:"+fontsize+"' align='center'>"+value+"</td></tr></table></v:textbox></v:shape>";
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document.write(html);
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}
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function addGround(left,top,width,height,zindex,fillcolor,linecolor1,linecolor2,offset,level,min,leftoffset,textwidth,textheight,fontsize)
{
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addBackground(left,top,width,height,zindex,fillcolor);
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addLine(zindex,left+"px,"+top+"px",((left-0)+(width-0))+"px,"+top+"px",linecolor1);
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addLine(zindex,left+"px,"+top+"px",left+"px,"+(top-height)+"px",linecolor1);
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addLine(zindex,((left-0)+(offset-0))+"px,"+(top-offset)+"px",((left-0)+(width-0))+"px,"+(top-offset)+"px",linecolor2);
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addLine(zindex,((left-0)+(offset-0))+"px,"+(top-offset)+"px",((left-0)+(offset-0))+"px,"+(top-height)+"px",linecolor2);
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addLine(zindex,left+"px,"+(top-offset)+"px",((left-0)+(offset-0))+"px,"+top+"px",linecolor2);
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for(var i=1;i<level;i++)
{
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addLine(zindex,left+"px,"+(top-offset-(height*i)/level)+"px",((left-0)+(offset-0))+"px,"+(top-(height*i)/level)+"px",linecolor2);
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addLine(zindex,(left-leftoffset)+"px,"+(top-(height*i)/level)+"px",left+"px,"+(top-(height*i)/level)+"px",linecolor1);
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addText(left-textwidth,(top-(height*i)/level)+(textheight-0)+2,textwidth,textheight,"-1",i*min,fontsize)
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addLine(zindex,((left-0)+(offset-0))+"px,"+(top-offset-(height*i)/level)+"px",((left-0)+(width-0))+"px,"+(top-offset-(height*i)/level)+"px",linecolor2);
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}
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addLine(zindex,(left-leftoffset)+"px,"+(top-(height*level)/level)+"px",left+"px,"+(top-(height*level)/level)+"px",linecolor1);
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addText(left-textwidth,(top-(height*level)/level)+(textheight-0)+2,textwidth,textheight,"-1",level*min,fontsize)
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}
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function addEPole(left,top,width,height,zindex,fillcolor,color,textwidth,textheight,value1,value2,fontsize)
{
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addText(left-textwidth/2+width/2,top-height-10,textwidth,textheight,zindex,value1,fontsize);
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addText(left-textwidth/2+width/2,(top-0)+(textheight-0),textwidth,textheight,zindex,value2,fontsize);
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addPole(left,top,width,height,zindex,fillcolor,color)
188
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}
190
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</SCRIPT>
192
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</HEAD>
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196
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<BODY>
198
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<div>
200
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<SCRIPT LANGUAGE="JavaScript">
202
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<!--
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addEPole("180","400","30","150","1","#3300FF","#66FFFF","80","18","300","1月份","9pt");
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addEPole("230","400","30","300","1","#FF0000","#99FFFF","80","18","600","2月份","9pt");
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addEPole("280","400","30","200","1","#33CC00","#99FFFF","80","18","400","3月份","9pt");
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addEPole("330","400","30","100","1","#FF0099","#99FFFF","80","18","200","4月份","9pt");
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addEPole("380","400","30","50","1","#660000","#99FFFF","80","18","100","5月份","9pt");
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addEPole("430","400","30","20","1","#FFFF00","#99FFFF","80","18","40","6月份","9pt");
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addEPole("480","400","30","180","1","#330066","#99FFFF","80","18","360","7月份","9pt");
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addEPole("530","400","30","120","1","#CC6633","#99FFFF","80","18","240","8月份","9pt");
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addEPole("580","400","30","80","1","#9933FF","#99FFFF","80","18","160","9月份","9pt");
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addGround("160","400","460","300","-1","#33CCFF","#000000","#6699CC","10","6","100","20","40","18","9pt")
226
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//-->
228
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</SCRIPT>
230
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</div>
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</body>
234
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</html>
236
效果图如下：
是不是很漂亮呢？我是觉得很漂亮。
其中方法调用，想知道每个参数的详细信息，你可以自己试：
addEPole("580","400","30","80","1","#9933FF","#99FFFF","80","18","160","9月份","9pt");
参数含义包括上边距离，左边距，以及高宽，以及XY上的内容 。以及颜色，柱体的宽度等等信息。
addGround("160","400","460","300","-1","#33CCFF","#000000","#6699CC","10","6","100","20","40","18","9pt")
定义了范围大小以及6个刻度，每个100，还包括字体大小，刻度线颜色，以及内部线条颜色，以及渐变色等等含义。
三、JFreechart使用
注意生成图都自动存在临时文件夹里的。
总结过上手资料文章：
http://www.blogjava.net/JAVA-HE/archive/2007/04/18/111439.html
但是朋友反映总结得过于粗浅。
这里写详细点：
1. 柱状图
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DefaultCategoryDataset dataset = new DefaultCategoryDataset ();
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dataset.addValue (300, "广州", "苹果");
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dataset.addValue (200, "广州", "梨子");
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dataset.addValue (600, "广州", "葡萄");
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dataset.addValue (340, "广州", "芒果");
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dataset.addValue (280, "广州", "荔枝");
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JFreeChart chart = ChartFactory.createBarChart3D ("水果销量统计图","水果","销量",
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dataset,PlotOrientation.VERTICAL, //选择水平或者垂直放
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false,//是否显示颜色类别（地区）提示
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false,
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false);
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String filename = ServletUtilities.saveChartAsPNG (chart, 500, 300, null, session);
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String graphURL = request.getContextPath () + "/servlet/DisplayChart?filename=" + filename;
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2. 饼图
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DefaultPieDataset data = new DefaultPieDataset();
2
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data.setValue("六月", 500);
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data.setValue("七月", 580);
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data.setValue("八月", 828);
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PiePlot plot = new PiePlot(data);
10
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JFreeChart chart = new JFreeChart("", JFreeChart.DEFAULT_TITLE_FONT, plot, true);
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chart.setBackgroundPaint(java.awt.Color.white); //可选，设置图片背景色
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chart.setTitle("Welcome to Jfreechart !"); //可选，设置图片标题
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ChartRenderingInfo info = new ChartRenderingInfo(new StandardEntityCollection());
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//500是图片长度，300是图片高度
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String filename = ServletUtilities.saveChartAsPNG(chart, 500, 300, info, session);
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String graphURL = request.getContextPath() + "/servlet/DisplayChart?filename=" + filename;
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在插入图片的地方：
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<img src="<%= graphURL %>" width=500 height=300 border=0 usemap="#<%= filename %>">
30
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在xml中加入了：
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<servlet>
36
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<servlet-name>DisplayChart</servlet-name>
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<servlet-class>org.jfree.chart.servlet.DisplayChart</servlet-class>
40
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</servlet>
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<servlet-mapping>
44
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<servlet-name>DisplayChart</servlet-name>
46
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<url-pattern>/servlet/DisplayChart</url-pattern>
48
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</servlet-mapping>
50
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图片效果，请访问：http://www.blogjava.net/JAVA-HE/archive/2007/04/18/111439.html
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还可以如下创建 dataset对象：
54
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double[][] data = new double[][]
{
{672, 766, 223, 540, 126},
{325, 521, 210, 340, 106},
{332, 256, 523, 240, 526} };
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String[] rowKeys =
{"苹果","梨子","葡萄"};
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String[] columnKeys =
{"北京","上海","广州","成都","深圳"};
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CategoryDataset dataset = DatasetUtilities.createCategoryDataset(rowKeys, columnKeys, data);
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效果：
参照网上介绍的一些文章总是发现不能向我的这么顺利，不是说他们的有错。我想版本不一样了 。区别肯定是有的。
实际上建立什么样的图表，ChartFactory可以选择不同方法建立不同图表的。
比如直接讲原来一个柱状图，中改了一个方法，图就变了。
如：
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JFreeChart chart = ChartFactory.createLineChart ("水果销量统计图","水果","销量",
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dataset,PlotOrientation.VERTICAL,//选择水平或者垂直放
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true,//广州或者成都，这里颜色有区别的。（颜色类别）
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true,
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true);
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对比两幅图。只是方法名字不同。
再来个3D的:（createLineChart3D方法）
而作为createAreaChart建立的面积比例图：
需要注意点的是，数据先后对图像效果是有影响的。因为有覆盖存在。
补充一个让大家都晕的，我居然一直一位JFreechart 和CEWOLG是一个东西。所以总在那里找标签。还以为我下载的版本不同，所以那些东西都找不到呢！
四、结合cewolf使用
实际上大量应用的是线图：
经典应用，无非是读取数据库，然后根据数据库中的值来生成线图。
生成线图的JSP：
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<%@page pageEncoding="UTF-8"%>
4
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<%@page import="java.sql.*"%>
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<%@page import="java.util.*"%>
8
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<%@page import="de.laures.cewolf.*"%>
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<%@page import="de.laures.cewolf.tooltips.*"%>
12
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<%@page import="de.laures.cewolf.links.*"%>
14
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<%@page import="org.jfree.data.*"%>
16
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<%@page import="org.jfree.data.time.*"%>
18
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<%@page import="org.jfree.data.gantt.*"%>
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<%@page import="org.jfree.chart.*"%>
22
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<%@page import="org.jfree.chart.plot.*"%>
24
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<%@page import="org.jfree.data.category.*"%>
26
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<%@page import="org.jfree.data.general.*"%>
28
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<%@page import="org.jfree.data.xy.*"%>
30
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<%@page import="java.awt.*" %>
32
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<%@page import="de.laures.cewolf.taglib.CewolfChartFactory" %>
34
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<%@page import="org.jfree.chart.event.ChartProgressListener" %>
36
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<%@page import="org.jfree.chart.event.ChartProgressEvent" %>
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<%@page import="com.palmtech.util.*" %>
40
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<%@page import="com.palmtech.sqldata.*" %>
42
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<%
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final int round=roleInfo.round;//获取游戏轮数
46
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int[][] loanDataTemp=new int[round][2];
48
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conn = null;
50
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result = new Vector ();
52
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ps = null;
54
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try
56
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{
58
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conn = DriverManager.getConnection ("proxool.BreadServer");
60
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ps = conn.prepareStatement ("CALL proc_graph_role_fee(?,?,?)");
62
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ps.setInt (1,gameID);
64
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ps.setInt (2,roleID);
66
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ps.setInt (3,2);
68
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ResultSet rs = ps.executeQuery ();
70
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for(int histroyRound=0;histroyRound<round;histroyRound++)
72
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{
74
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rs.absolute (histroyRound+1);//游标从1开始
76
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for(int i=0;i<2;i++)
78
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{
80
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loanDataTemp[histroyRound][i]=rs.getInt (2+i);
84
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//out.print (loanDataTemp[histroyRound][i]+" ");
86
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}
88
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//out.println ("<br>");
90
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}
92
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rs.close ();
94
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ps.close ();
96
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ps = null;
98
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}
100
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catch (Exception ex)
102
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{
104
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ex.printStackTrace ();
106
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result = new Vector ();
108
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}
110
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finally
112
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{
114
115
if(ps!=null)
116
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{try
118
119
{ps.close ();}
120
121
catch(Exception e)
122
123
{}ps=null;}
124
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try
126
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{conn.close ();}
128
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catch(Exception e)
130
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{}conn=null;
132
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}
134
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final int[][] loanData=loanDataTemp;
136
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%>
138
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<%
140
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//if (pageContext.getAttribute("initFlag") == null)
142
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{
144
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DatasetProducer g_loan = new DatasetProducer ()
146
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{
148
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public Object produceDataset (Map params)
150
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{
152
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final String[] seriesNames =
{ "销售利润", "贷款增加额曲线"};
154
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String[] categories=new String[round];
156
157
for(int i=0;i<round;i++)
158
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{
160
161
categories[i]=""+(i+1);
162
163
}
164
165
DefaultCategoryDataset dataset = new DefaultCategoryDataset ()
166
167
{
168
169
protected void finalize () throws Throwable
170
171
{
172
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super.finalize ();
174
175
}
176
177
};
178
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for (int series = 0; series < seriesNames.length; series ++)
180
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{
182
183
for (int i = 0; i < categories.length; i++)
184
185
{
186
187
dataset.addValue (loanData[i][series], seriesNames[series], categories[i]);
188
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}
190
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}
192
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return dataset;
194
195
}
196
197
public String getProducerId ()
198
199
{
200
201
return "CategoryDataProducer";
202
203
}
204
205
public boolean hasExpired (Map params, java.util.Date since)
206
207
{
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return (System.currentTimeMillis () - since.getTime ()) > 5000;
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}
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};
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pageContext.setAttribute ("g_loan", g_loan);
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pageContext.setAttribute ("initFlag", "init");
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}
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%>
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<%int r_loan=MathUtil.random(-2, 2);%>
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<html>
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<head>
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<link href="cewolf.css" rel="stylesheet" type="text/css"></head>
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<BODY>
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<p>
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<table border=0>
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<TR>
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<TD>
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<cewolf:chart id="lineChart" title="销售利润/贷款增加额曲线" type="line" xaxislabel="回合数" yaxislabel="金额">
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<cewolf:data>
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<cewolf:producer id="g_loan" />
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</cewolf:data>
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</cewolf:chart>
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<cewolf:img chartid="lineChart" renderer="/cewolf" width="300" height="<%=(r_loan+300)%>"/>
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</TD>
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</TR>
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</TABLE>
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</body>
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</html>
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在上面的程序<cewolf:data>上加入：
<cewolf:colorpaint color="#FFEEEE"/>
指定图的背景色。
也可以：
<cewolf:gradientpaint>
<cewolf:point x="0" y="0" color="#FFFFFF" />
<cewolf:point x="300" y="0" color="#DDDDFF" />
</cewolf:gradientpaint>
这样指定渐变色。
甚至
<cewolf:texturepaint image="/img/bg.jpg" width="60" height="60" />
指定背景图。
而在另一个JSP页面里显示：
<%@include file='graph.jsp'%>
这样就把上面生成线图的JSP页面应用到当前JSP页面里。
也许你疑问为何用这个tld呢？因为这样嵌入了图表的JSP就不用使用任何Java代码。
记得将cewolf.tld放在web-inf下面。
在xml里追加:
1<servlet>
2
3 <servlet-name>CewolfServlet</servlet-name>
4
5 <servlet-class>de.laures.cewolf.CewolfRenderer</servlet-class>
6
7 <!-- sets storage implementation -->
8
9 <init-param>
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11 <param-name>storage</param-name>
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13 <param-value>de.laures.cewolf.storage.TransientSessionStorage</param-value>
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15 </init-param>
16
17 <!-- sets overlib.js location relative to webapp -->
18
19 <init-param>
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21 <param-name>overliburl</param-name>
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23 <param-value>overlib.js</param-value>
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25 </init-param>
26
27 <!-- turn on or off debugging logging -->
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29 <init-param>
30
31 <param-name>debug</param-name>
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33 <param-value>true</param-value>
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35 </init-param>
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37 <load-on-startup>1</load-on-startup>
38
39 </servlet>
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41<servlet-mapping>
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43 <servlet-name>CewolfServlet</servlet-name>
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45 <url-pattern>/cewolf/*</url-pattern>
46
47 </servlet-mapping>
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49
将overlib.js复制到WEB应用程序的根目录下；
verticalBar类型和line类型可以直接换。不需要改其他地方。
效果图对比:
只是类型变了（加上了背景色效果）：
加点背景图片：（加了个半裸女，可惜挡住了。呵呵）
五、JS CHART
随后我又在http://webfx.eae.net/发现一个用js写的chart开源工具包。
要用到报表的地方：
<div id="chart2" class="chart" style="width: 400px; height: 200px;"></div>
而在HTMLhead部分导入需要的JS 文件。参考其提供的demo文件，稍做修改就能完全使用。
1<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
2
3<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
4
5 <head>
6
7 <title>Chart Demo (WebFX)</title>
8
9 <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
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11 <script type="text/javascript" src="includes/excanvas.js"></script>
12
13 <script type="text/javascript" src="includes/wz_jsgraphics.js"></script>
14
15 <script type="text/javascript" src="includes/chart.js"></script>
16
17 <script type="text/javascript" src="includes/canvaschartpainter.js"></script>
18
19 <script type="text/javascript" src="includes/jgchartpainter.js.js"></script>
20
21 <script type="text/javascript" src="includes/demo.js"></script>
22
23 <link rel="stylesheet" type="text/css" href="includes/canvaschart.css" />
24
25 <style type="text/css">
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27 .chart {}{ margin-left: 20px; }
28
29 </style>
30
31 </head>
32
33 <body onload="demo();">
34
35 <div class="webfx-main-body">
36
37 <div id="chart3" class="chart" style="width: 400px; height: 200px;"></div>
38
39 </div>
40
41 </body>
42
43</html>
44
负责绘制工作的js：
1function demo() {
2
3 var c = new Chart(document.getElementById('chart3'));
4
5 c.setDefaultType(CHART_LINE);
6
7 c.setGridDensity(10, 10);
8
9 c.setHorizontalLabels(['mon', 'tue', 'wed', 'thu', 'fri', 'sat', 'sun', 'mon', 'tue', 'wed']);
10
11%