JSP页面的验证码生成及调用方法
首先是要生成验证码：<div style="padding-right: 5.4pt; padding-left: 5.4pt; background: #e6e6e6; padding-bottom: 4px; width: 95%; padding-top: 4px;">http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gifpackage XX.XX
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gifimport java.io.*;
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gifimport java.util.*;
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gifimport javax.imageio.*;
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gifimport java.awt.*;
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gifimport java.awt.image.*;
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/ExpandedBlockStart.gifhttp://images.csdn.net/syntaxhighlighting/OutliningIndicators/ContractedBlock.gifpublic class ImageEnsure ...{
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/ExpandedSubBlockStart.gifhttp://images.csdn.net/syntaxhighlighting/OutliningIndicators/ContractedSubBlock.gif public ImageEnsure() ...{
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/ExpandedSubBlockEnd.gif }
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/ExpandedSubBlockStart.gifhttp://images.csdn.net/syntaxhighlighting/OutliningIndicators/ContractedSubBlock.gif private char mapTable[] = ...{'0', '1', '2', '3',
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/ExpandedSubBlockEnd.gif '4', '5', '6', '7', '8', '9'};
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/ExpandedSubBlockStart.gifhttp://images.csdn.net/syntaxhighlighting/OutliningIndicators/ContractedSubBlock.gif public String getEnsure(int width, int height, OutputStream os) ...{
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif if (width <= 0)
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif width = 60;
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif if (height <= 0)
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif height = 20;
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif BufferedImage image = new BufferedImage(width, height,
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif BufferedImage.TYPE_INT_RGB);
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif // 获取图形上下文
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif Graphics g = image.getGraphics();
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif // 设定背景色
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif g.setColor(new Color(0xDCCCCC));
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif g.fillRect(0, 0, width, height);
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif //画边框
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif g.setColor(Color.black);
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif g.drawRect(0, 0, width - 1, height - 1);
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif // 取随机产生的认证码
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif String strEnsure = "";
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif // 4代表4位验证码
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/ExpandedSubBlockStart.gifhttp://images.csdn.net/syntaxhighlighting/OutliningIndicators/ContractedSubBlock.gif for (int i = 0; i < 4; ++i) ...{
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif strEnsure += mapTable[(int) (mapTable.length * Math.random())];
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/ExpandedSubBlockEnd.gif }
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif // 将认证码显示到图象中
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif g.setColor(Color.red);
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif g.setFont(new Font("Atlantic Inline", Font.PLAIN, 14));
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif //画的具体坐标
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif String str = strEnsure.substring(0, 1);
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif g.drawString(str, 8, 14);
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif str = strEnsure.substring(1, 2);
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif g.drawString(str, 20, 15);
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif str = strEnsure.substring(2, 3);
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif g.drawString(str, 35, 18);
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif str = strEnsure.substring(3, 4);
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif g.drawString(str, 45, 15);
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif // 释放图形上下文
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif g.dispose();
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/ExpandedSubBlockStart.gifhttp://images.csdn.net/syntaxhighlighting/OutliningIndicators/ContractedSubBlock.gif try ...{
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif // 输出图象到页面
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif ImageIO.write(image, "JPEG", os);
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/ExpandedSubBlockStart.gifhttp://images.csdn.net/syntaxhighlighting/OutliningIndicators/ContractedSubBlock.gif } catch (IOException e) ...{
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif return "";
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/ExpandedSubBlockEnd.gif }
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif return strEnsure;
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/ExpandedSubBlockEnd.gif }
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/ExpandedBlockEnd.gif}
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