Servlet和Image如何做出一个验证码程序的完整版的源码？

马克-to-win： 根据上面程序，我做了一个验证码程序的大概。所有的技术点都已经涵盖了。有兴趣的同学可以自己把完整版的验证码程序做出来。

例：4.4.4

<%@ page contentType="text/html; charset=GBK"%>

<script type="text/javascript">

function flushcode(){

var fName=document.getElementById("code").alt;

// alert(fName);

document.getElementById("code").src="MarkToWinServlet"+"?Name="+fName+Math.random();

}

</script>

<img id="code" src="MarkToWinServlet" alt="马克-to-win"/>

<button οnclick="flushcode()">刷新</button>

package com;

import java.io.IOException;

import java.io.UnsupportedEncodingException;

import java.util.Random;

import javax.servlet.ServletException;

import javax.servlet.ServletOutputStream;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import javax.servlet.http.HttpSession;

import javax.imageio.ImageIO;

import java.awt.image.BufferedImage;

import java.awt.Graphics;

import java.awt.Color;

import java.awt.Font;

public class ServletHello1 extends HttpServlet {

public void doGet(HttpServletRequest request, HttpServletResponse response)

throws ServletException, IOException {

BufferedImage image = new BufferedImage(350, 30,

BufferedImage.TYPE_INT_RGB);

Graphics g = image.getGraphics();

g.setColor(Color.white);

g.fillRect(0, 0, 350, 30);

Random r = new Random();

g.setColor(Color.red);

for (int i = 0; i < 200; i++) {

/* @param n the bound on the random number to be returned. Must be

* positive.

*/

int x = r.nextInt(350);

int y = r.nextInt(30);

/* the following draw a point instead of a line. */

g.drawLine(x, y, x, y);

}

更多请看：https://blog.csdn.net/qq_44594371/article/details/103167165