用javabean方式读取文本文件制作统计图.docVIP

用javabean方式读取文本文件制作统计图 1.制作文本文件ColumnHeightArray.txt 10 200 150 20 100 2.Graphics.jsp %@ page contentType=text/html;charset=GBK % %@page import=java.io.*% jsp:useBean id=cg scope=page class=tu.ChartGraphics / % int height[]=new int[5]; String fname=pageContext.getServletContext().getRealPath(ColumnHeightArray.txt); File file = new File(fname); FileReader fr = null; BufferedReader br=null; try { fr = new FileReader(file); br = new BufferedReader(fr); String line; int i=0; while((line = br.readLine()) != nulli 5) { height[i]=Integer.parseInt(line); i++; } fr.close(); br.close(); } catch (Exception e) { //捕获文件读写异常，输出在页面上 out.println(e.getMessage()); } cg.graphicsGeneration(height[0],height[1],height[2],height[3],height[4]); % html head title/title meta http-equiv=Content-Type content=text/html; charset=gb2312 /head body table tr td%=height[0]%%=height[1]%%=height[2]%%=height[3]%%=height[4]%/td /tr tr td align=centerimg src=CSDN\\chart.jpg vspace=3 border=0 align=absmiddle //td /tr /table /body /html 3.ChartGraphics.java package tu; import java.io.*; import java.util.*; import com.sun.image.codec.jpeg.*; import java.awt.image.*; import java.awt.*; public class ChartGraphics { BufferedImage image; public void createImage(String fileLocation) { try { FileOutputStream fos = new FileOutputStream(fileLocation); BufferedOutputStream bos = new BufferedOutputStream(fos); JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(bos); encoder.encode(image); bos.close(); } catch(Exception e) { System.out.println(e); } }