<%@ page language="java" contentType="charset=gb2312"%> <% response.setHeader("Cache-Control","no-store"); //HTTP 1.1 response.setHeader("Pragma","no-cache"); //HTTP 1.0 response.setDateHeader ("Expires", 0); //prevents caching at the proxy server %> <%@ page import="java.io.OutputStream" %> <%@ page import="java.awt.image.*" %> <%@ page import="java.awt.*,java.awt.font.*,java.awt.geom.*,javax.imageio.*,java.io.*" %>
<%@ page import="com.sun.image.codec.jpeg.*" %> <%@ page import="acec.*,java.util.*" %>
<!--%@ include file = "graphBG.jsp"%--> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=gb2312"></head>
<%
//数据数组 String datanames[] = {"第一季度", "第二季度", "第三季度"}; int datavalues[] = {111, 620, 33};
int WIDTH = 600;
int HEIGHT =400;
int innerHEIGHT = HEIGHT-100; int innerWIDTH = WIDTH-20;
int maximum = 0;
for(int i=0; i<datavalues.length; i++) { if(datavalues[i] > maximum) { maximum = datavalues[i]; } }
response.setContentType("image/jpeg"); BufferedImage bi = new BufferedImage(WIDTH, HEIGHT, BufferedImage.TYPE_INT_RGB);
Graphics2D biContext = bi.createGraphics();
//插入背景图案 try{ Image image=ImageIO.read(new File("bg.jpg")); biContext.drawImage(image,0,0,WIDTH,HEIGHT,null); }catch(Exception ex){System.out.println(ex.toString());}
//开始绘图
int barWidth = innerWIDTH/(datavalues.length*4);
//System.out.println("barWidth="+barWidth); for(int i=0,ii=0; i<datavalues.length; i++,ii++) { Color barColor=null; Color barColor1=null; if(ii==0)//蓝色 { barColor=new Color(48,36,189); barColor1 = new Color(201,201,245); } else if(ii==1)//绿色 { barColor=new Color(62,145,68); barColor1 = new Color(210,236,236); } else if(ii==2)//红色 { barColor=Color.red; barColor1 = new Color(253,181,199); ii=-1; }
int currentValue = datavalues[i]; //Set bar width int barHeight = (innerHEIGHT * currentValue) / maximum;
biContext.setColor(barColor); Rectangle barRect = new Rectangle(barWidth,barHeight);
//取字的宽度 Font f=biContext.getFont(); FontRenderContext context=biContext.getFontRenderContext(); Rectangle2D bounds_top=f.getStringBounds("人气值:"+currentValue,context); Rectangle2D bounds=f.getStringBounds(datanames[i],context); biContext.setColor(Color.black);
//柱形的定位 int locationY=HEIGHT-barHeight-20; int locationX=innerWIDTH/datavalues.length*(i+1)-barWidth/2; if(datavalues.length%2!=0) locationX=innerWIDTH/(datavalues.length+1)*(i+1)-barWidth/2;
barRect.setLocation(locationX,locationY); biContext.drawString(datanames[i],(int)((locationX+barWidth/2)-bounds.getWidth()/2),HEIGHT-5);
biContext.drawString("人气值:"+currentValue, (int)((locationX+barWidth/2)-bounds_top.getWidth()/2),locationY-10);
biContext.setPaint(new GradientPaint(locationX,locationY,barColor1,locationX+barWidth,locationY,barColor)); biContext.fill(barRect); }
///////////////////////////////////////////////////////////////////////////////////// //保存图片 /////////////////////////////////////////////////////////////////////////////////////
OutputStream bos = new FileOutputStream(application.getRealPath("tp.jpeg")); JPEGImageEncoder encoder1 = JPEGCodec.createJPEGEncoder(bos); encoder1.encode(bi); bos.close();
%> <body leftmargin="0" topmargin="0"> <img src="tp.jpeg" width="600" height="400"> </html> 
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