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我得到了一个使用Strut1框架的旧项目。所以它使用JSP从另一个JSP文件加载验证码图像。下面的源代码。Spring Boot转换（从jsp加载图片）到（从html加载）
现在，我使用Spring Boot和Thymeleaf布局升级该项目。我不知道如何将其转换为html。请看看并给出想法。
谢谢。
对于login.jsp的
<div id="captcha" style="cursor: pointer; height: 30px; width: 150px; display: inline-block; float: left"><img src="captcha.jsp"></div>
captcha.jsp
<%@ page contentType="text/html;charset=UTF-8"%>
<%@ page import="java.util.*"%>
<%@ page import="java.io.*"%>
<%@ page import="javax.servlet.*"%>
<%@ page import="javax.servlet.http.*"%>
<%@ page import="java.awt.*"%>
<%@ page import="java.awt.image.*"%>
<%@ page import="javax.imageio.*"%>
<%@ page import="java.awt.geom.*"%>
<%@ page import="vn.com.tivn.online.acquiring.util.ValueUtil"%>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>captcha</title>
</head>
<body>
<%
//========================================================
// Kick Ass Captcha JSP
//
// Michael Connor 2007
//
// I just couldn't handle the thought of downloading a
// big jar and configuring some servlet.xml and having
// little to no control of anything...
// You can send in height and width parameters.
// The captcha value will be placed in the session in
// a parameter called 'captcha'
//
// Feel free to use this code and do whatever the hell
// you want to it.
//========================================================
String imageFormat = "png";
response.setContentType("image/" + imageFormat);
try {
// you can pass in fontSize, width, height via the request
Color backgroundColor = Color.blue;
Color borderColor = Color.black;
Color textColor = Color.white;
Color circleColor = new Color(160,160,160);
Font textFont = new Font("Arial", Font.PLAIN, paramInt(request, "fontSize", 24));
int charsToPrint = 6;
int width = paramInt(request, "width", 150);
int height = paramInt(request, "height", 30);
int circlesToDraw = 6;
float horizMargin = 20.0f;
float imageQuality = 0.95f; // max is 1.0 (this is for jpeg)
double rotationRange = 0.7; // this is radians
BufferedImage bufferedImage = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
Graphics2D g = (Graphics2D) bufferedImage.getGraphics();
g.setColor(backgroundColor);
g.fillRect(0, 0, width, height);
// lets make some noisey circles
g.setColor(circleColor);
for (int i = 0; i < circlesToDraw; i++) {
int circleRadius = (int) (Math.random() * height/2.0);
int circleX = (int) (Math.random() * width - circleRadius);
int circleY = (int) (Math.random() * height - circleRadius);
g.drawOval(circleX, circleY, circleRadius * 2, circleRadius * 2);
}
g.setColor(textColor);
g.setFont(textFont);
FontMetrics fontMetrics = g.getFontMetrics();
int maxAdvance = fontMetrics.getMaxAdvance();
int fontHeight = fontMetrics.getHeight();
// i removed 1 and l and i because there are confusing to users...
// Z, z, and N also get confusing when rotated
// 0, O, and o are also confusing...
// lowercase G looks a lot like a 9 so i killed it
// this should ideally be done for every language...
// i like controlling the characters though because it helps prevent confusion
String elegibleChars = "ABCDEFGHJKLMPQRSTUVWXYabcdefhjkmnpqrstuvwxy23456789";
char[] chars = elegibleChars.toCharArray();
float spaceForLetters = -horizMargin * 2 + width;
float spacePerChar = spaceForLetters/(charsToPrint - 1.0f);
AffineTransform transform = g.getTransform();
StringBuffer finalString = new StringBuffer();
for (int i = 0; i < charsToPrint; i++) {
double randomValue = Math.random();
int randomIndex = (int) Math.round(randomValue * (chars.length - 1));
char characterToShow = chars[randomIndex];
finalString.append(characterToShow);
// this is a separate canvas used for the character so that
// we can rotate it independently
int charImageWidth = maxAdvance * 2;
int charImageHeight = fontHeight * 2;
int charWidth = fontMetrics.charWidth(characterToShow);
int charDim = Math.max(maxAdvance, fontHeight);
int halfCharDim = (int) (charDim/2);
BufferedImage charImage = new BufferedImage(charDim, charDim, BufferedImage.TYPE_INT_ARGB);
Graphics2D charGraphics = charImage.createGraphics();
charGraphics.translate(halfCharDim, halfCharDim);
double angle = (Math.random() - 0.5) * rotationRange;
charGraphics.transform(AffineTransform.getRotateInstance(angle));
charGraphics.translate(-halfCharDim,-halfCharDim);
charGraphics.setColor(textColor);
charGraphics.setFont(textFont);
int charX = (int) (0.5 * charDim - 0.5 * charWidth);
charGraphics.drawString("" + characterToShow, charX,
(int) ((charDim - fontMetrics.getAscent())
/2 + fontMetrics.getAscent()));
float x = horizMargin + spacePerChar * (i) - charDim/2.0f;
int y = (int) ((height - charDim)/2);
//System.out.println("x=" + x + " height=" + height + " charDim=" + charDim + " y=" + y + " advance=" + maxAdvance + " fontHeight=" + fontHeight + " ascent=" + fontMetrics.getAscent());
g.drawImage(charImage, (int) x, y, charDim, charDim, null, null);
charGraphics.dispose();
}
// let's do the border
g.setColor(borderColor);
g.drawRect(0, 0, width - 1, height - 1);
//Write the image as a jpg
Iterator iter = ImageIO.getImageWritersByFormatName(imageFormat);
if(iter.hasNext()) {
ImageWriter writer = (ImageWriter)iter.next();
ImageWriteParam iwp = writer.getDefaultWriteParam();
if (imageFormat.equalsIgnoreCase("jpg") || imageFormat.equalsIgnoreCase("jpeg")) {
iwp.setCompressionMode(ImageWriteParam.MODE_EXPLICIT);
iwp.setCompressionQuality(imageQuality);
}
writer.setOutput(ImageIO.createImageOutputStream(response.getOutputStream()));
IIOImage imageIO = new IIOImage(bufferedImage, null, null);
writer.write(null, imageIO, iwp);
} else {
throw new RuntimeException("no encoder found for jsp");
}
// let's stick the final string in the session
request.getSession().setAttribute("wirecardmposcaptcha", finalString.toString());
System.out.print("----------"+g.dispose());
g.dispose();
} catch (IOException ioe) {
throw new RuntimeException("Unable to build image" , ioe);
}
%>
<%!
public static String paramString(HttpServletRequest request, String paramName, String defaultString) {
return request.getParameter(paramName) != null ? request.getParameter(paramName) : defaultString;
}
public static int paramInt(HttpServletRequest request, String paramName, int defaultInt) {
return request.getParameter(paramName) != null ? Integer.parseInt(request.getParameter(paramName)) : defaultInt;
}
%>
<%
if(ValueUtil.SUPPORT_SSL){
String sessionid = request.getSession().getId();
response.addHeader("SET-COOKIE", "JSESSIONID=" + sessionid + "; Secure; HttpOnly");
}
%>
</body>
</html>
谢谢，让我试试看。 –