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package com.servlet;
import java.awt.Color;
import java.awt.Graphics;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.util.Random;
import javax.imageio.ImageIO;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
@WebServlet("/servlet/ImageCodeServlet")
public class ImageCodeServlet extends HttpServlet{
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
req.setCharacterEncoding("utf-8");
resp.setCharacterEncoding("utf-8");
/**
* 生成带字符串的文本图片
*/
// 1.创建图片缓存区 传参为宽高和图片类型
BufferedImage image = new BufferedImage(68, 22, BufferedImage.TYPE_INT_RGB);
// 2.创建绘制环境（拿到画笔）
Graphics paint = image.getGraphics();
Color c = new Color(200,150,255);
// 设置画笔
paint.setColor(c);
// 画背景
paint.fillRect(0, 0, 68, 22);
StringBuffer codes = new StringBuffer();
// 设置文本
char[] ch = "QWERTYUIOPASDFGHJKLZXCVBNM1234567890".toCharArray();
Random r = new Random(); //随机数
int index;
for(int i=0;i