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95 lines
2.9 KiB
95 lines
2.9 KiB
package com.controller.before;
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import java.awt.Color;
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import java.awt.Font;
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import java.awt.Graphics;
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import java.awt.image.BufferedImage;
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import java.io.IOException;
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import java.io.OutputStream;
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import java.util.Random;
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import javax.imageio.ImageIO;
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import javax.servlet.ServletException;
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import javax.servlet.http.HttpServletRequest;
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import javax.servlet.http.HttpServletResponse;
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import javax.servlet.http.HttpSession;
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import org.springframework.stereotype.Controller;
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import org.springframework.web.bind.annotation.RequestMapping;
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/**
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* 验证码
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*/
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@Controller
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public class ValidateCodeController {
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private char code[] = { 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j',
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'k', 'm', 'n', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y',
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'z', 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'J', 'K', 'L', 'M',
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'N', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z', '2',
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'3', '4', '5', '6', '7', '8', '9' };
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private static final int WIDTH = 50;
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private static final int HEIGHT = 20;
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private static final int LENGTH = 4;
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@RequestMapping("/validateCode")
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public void validateCode(HttpServletRequest request,
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HttpServletResponse response) throws ServletException, IOException {
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// TODO Auto-generated method stub
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// 设置响应报头信息
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response.setHeader("Pragma", "No-cache");
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response.setHeader("Cache-Control", "no-cache");
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response.setDateHeader("Expires", 0);
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// 设置响应的MIME类型
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response.setContentType("image/jpeg");
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BufferedImage image = new BufferedImage(WIDTH, HEIGHT,
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BufferedImage.TYPE_INT_RGB);
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Font mFont = new Font("Arial", Font.TRUETYPE_FONT, 18);
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Graphics g = image.getGraphics();
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Random rd = new Random();
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// 设置背景颜色
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g.setColor(new Color(rd.nextInt(55) + 200, rd.nextInt(55) + 200, rd
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.nextInt(55) + 200));
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g.fillRect(0, 0, WIDTH, HEIGHT);
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// 设置字体
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g.setFont(mFont);
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// 画边框
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g.setColor(Color.black);
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g.drawRect(0, 0, WIDTH - 1, HEIGHT - 1);
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// 随机产生的验证码
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String result = "";
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for (int i = 0; i < LENGTH; ++i) {
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result += code[rd.nextInt(code.length)];
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}
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HttpSession se = request.getSession();
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se.setAttribute("code", result);
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// 画验证码
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for (int i = 0; i < result.length(); i++) {
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g.setColor(new Color(rd.nextInt(200), rd.nextInt(200), rd
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.nextInt(200)));
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g.drawString(result.charAt(i) + "", 12 * i + 1, 16);
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}
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// 随机产生2个干扰线
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for (int i = 0; i < 2; i++) {
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g.setColor(new Color(rd.nextInt(200), rd.nextInt(200), rd
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.nextInt(200)));
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int x1 = rd.nextInt(WIDTH);
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int x2 = rd.nextInt(WIDTH);
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int y1 = rd.nextInt(HEIGHT);
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int y2 = rd.nextInt(HEIGHT);
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g.drawLine(x1, y1, x2, y2);
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}
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// 释放图形资源
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g.dispose();
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try {
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OutputStream os = response.getOutputStream();
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// 输出图像到页面
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ImageIO.write(image, "JPEG", os);
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} catch (IOException e) {
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e.printStackTrace();
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}
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}
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} |