【Java开源代码栏目提醒】:网学会员,鉴于大家对Java开源代码十分关注,论文会员在此为大家搜集整理了“VoteImage.java”一文,供大家参考学习!
package com.jsp.chap08;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.*;
import java.util.*;
import com.sun.image.codec.jpeg.*;
import javax.servlet.*;
import javax.servlet.http.*;
import java.awt.*;
import java.awt.geom.*;
import java.awt.image.*;
public class VoteImage extends HttpServlet
{
private String strFile = null;
//设定图片选项的颜色
private Color color[]={Color.red,Color.black,Color.orange,Color.green};
private int baseAng = 100;
//处理Http的Get请求
public void doGet(HttpServletRequest request,HttpServletResponse response)
throws ServletException,IOException
{
//从count.txt文件中获取投票值
strFile = request.getRealPath("count.txt");
response.setContentType("image/jpeg");
float[][] xy = new float[4][2];
xy = getNumAndPercent(strFile);
//设定一个分成4份的圆形比例图
int[] ang = new int[4];
ang[0] = (int)(xy[0][1]*360);
ang[1] = (int)(xy[1][1]*360);
ang[2] = (int)(xy[2][1]*360);
ang[3] = 360-ang[0]-ang[1]-ang[2];
BufferedImage image=new BufferedImage(150,100,BufferedImage.TYPE_INT_RGB);
Graphics2D g=(Graphics2D)image.getGraphics();
g.setRenderingHint(RenderingHints.KEY_ANTIALIASING,RenderingHints.VALUE_ANTIALIAS_ON);
g.setColor(Color.white);
g.fillRect(0,0,150,100);
AffineTransform at = null;
Arc2D arc = null;
int fromAng = baseAng;
at = AffineTransform.getRotateInstance((-20*java.lang.Math.PI)/180,45,37);
g.setTransform(at);
g.setColor(color[0]);
fromAng+=ang[0];
for (int i=1;i<4;i++)
{
g.setColor(color[i]);
arc = new Arc2D.Double(10,24,80,50,fromAng,ang[i],Arc2D.PIE);
g.fill(arc);
fromAng+=ang[i];
}
at = AffineTransform.getRotateInstance(0,arc.getCenterX(),arc.getCenterY());
g.setTransform(at);
for (int i=0;i<4;i++)
{
//选项与相应的颜色对应
g.setColor(color[i]);
g.fillRect(100,15*i+20,10,10);
g.drawString((char)('A'+i)+"",120,15*i+20+8);
}
JPEGImageEncoder jpegimageencoder = JPEGCodec.createJPEGEncoder (response.getOutputStream());
jpegimageencoder.encode(image);
}
public void doPost(HttpServletRequest request,HttpServletResponse response)
throws ServletException,IOException
{
doGet(request, response);
}
public synchronized float[][] getNumAndPercent(String sFileName)
{
float xx[][] = new float[4][2];
int totalNum = 0;
String strTemp = null;
int i = 0;
java.io.RandomAccessFile rf = null;
try
{
rf = new java.io.RandomAccessFile(sFileName,"r");
} catch(Exception e)
{
System.out.println(e);
System.exit(0);
}
for (i=0;i<4;i++)
{
int m=0;
try
{
strTemp = rf.readLine();
} catch (Exception e){}
}
return xx;
}
}