package com.moral.monitor.controller;
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import com.moral.monitor.util.ResourceUtil;
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import org.springframework.stereotype.Controller;
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import org.springframework.web.bind.annotation.RequestMapping;
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import org.springframework.web.bind.annotation.RequestMethod;
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import javax.imageio.ImageIO;
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import javax.servlet.ServletException;
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import javax.servlet.http.HttpServlet;
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import javax.servlet.http.HttpServletRequest;
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import javax.servlet.http.HttpServletResponse;
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import java.awt.*;
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import java.awt.image.BufferedImage;
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import java.io.IOException;
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import java.util.Random;
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/**
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* Created by a on 2017/7/4.
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*/
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@Controller
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@RequestMapping("/VerificationCode")
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public class VerificationCodeController {
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private static final long serialVersionUID = 1L;
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/**
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* 这里用作存入session的名称
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*/
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private static final String SESSION_KEY_OF_RAND_CODE = "randCode"; // todo 要统一常量
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/**
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*
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*/
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private static final int count = 150;
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/**
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* 定义图形大小(宽)
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*/
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private static final int width = 105;
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/**
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* 定义图形大小(高)
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*/
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private static final int height = 35;
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/**
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* 干扰线的长度=1.414*lineWidth
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*/
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private static final int lineWidth = 20;
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@RequestMapping(value = "/generate", method = { RequestMethod.POST, RequestMethod.GET })
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public void VerificationCode( HttpServletRequest request, HttpServletResponse response) throws ServletException,
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IOException {
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// 设置页面不缓存
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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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// response.setContentType("image/png");
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// 在内存中创建图象
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final BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
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// 获取图形上下文
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final Graphics2D graphics = (Graphics2D) image.getGraphics();
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// 设定背景颜色
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graphics.setColor(Color.white);
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graphics.fillRect(0, 0, width, height);//填充衍射
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// 设定边框颜色,绘制一个距形
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//graphics.setColor(getRandColor(100, 200)); // ---2.这是以数字型来设置颜色，颜色模式是指使用三种基色：红、绿、蓝，通过三种颜色的调整得出其它各种颜色，这三种基色的值范围为0～255
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graphics.drawRect(0, 0, width - 1, height - 1);
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final Random random = new Random();
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// 随机产生干扰线，使图象中的认证码不易被其它程序探测到
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for (int i = 0; i < count; i++) {
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graphics.setColor(getRandColor(80, 200)); // ---3.
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final int x = random.nextInt(width - lineWidth - 1) + 1; // 保证画在边框之内
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final int y = random.nextInt(height - lineWidth - 1) + 1;
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final int xl = random.nextInt(20);
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final int yl = random.nextInt(20);
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graphics.drawLine(x, y, x + xl, y + yl);
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}
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// 取随机产生的认证码(4位数字)
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final String resultCode = exctractRandCode();
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for (int i = 0; i < resultCode.length(); i++) {
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// 将认证码显示到图象中,调用函数出来的颜色相同，可能是因为种子太接近，所以只能直接生成
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// graphics.setColor(new Color(20 + random.nextInt(130), 20 + random
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// .nextInt(130), 20 + random.nextInt(130)));
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// 设置字体颜色
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graphics.setColor(Color.black);
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// 设置字体样式
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//graphics.setFont(new Font("Arial Black", Font.ITALIC, 18));
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graphics.setFont(new Font("Times New Roman", Font.BOLD, 24));
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// 设置字符，字符间距，上边距
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/*System.out.print(resultCode.charAt(i));*/
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graphics.drawString(String.valueOf(resultCode.charAt(i)), (23 * i) + 8, 26);
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}
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//System.out.println("直接输出：" + resultCode);
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// 将认证码存入SESSION
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request.getSession().setAttribute(SESSION_KEY_OF_RAND_CODE, resultCode);
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// 图象生效
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graphics.dispose();
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// 输出图象到页面
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ImageIO.write(image, "JPEG", response.getOutputStream());
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}
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/**
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* @return 随机码
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*/
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private String exctractRandCode() {
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final String randCodeType = ResourceUtil.getRandCodeType();
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int randCodeLength = Integer.parseInt(ResourceUtil.getRandCodeLength());
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if (randCodeType == null) {
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return RandCodeImageEnum.NUMBER_CHAR.generateStr(randCodeLength);
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} else {
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switch (randCodeType.charAt(0)) {
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case '1':
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return RandCodeImageEnum.NUMBER_CHAR.generateStr(randCodeLength);
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case '2':
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return RandCodeImageEnum.LOWER_CHAR.generateStr(randCodeLength);
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case '3':
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return RandCodeImageEnum.UPPER_CHAR.generateStr(randCodeLength);
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case '4':
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return RandCodeImageEnum.LETTER_CHAR.generateStr(randCodeLength);
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case '5':
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return RandCodeImageEnum.ALL_CHAR.generateStr(randCodeLength);
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default:
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return RandCodeImageEnum.NUMBER_CHAR.generateStr(randCodeLength);
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}
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}
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}
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/**
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* 描述：根据给定的数字生成不同的颜色
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* @param 这是以数字型来设置颜色，颜色模式是指使用三种基色：红、绿、蓝，通过三种颜色的调整得出其它各种颜色，这三种基色的值范围为0～255
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* @param 这是以数字型来设置颜色，颜色模式是指使用三种基色：红、绿、蓝，通过三种颜色的调整得出其它各种颜色，这三种基色的值范围为0～255
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* @return 描述：返回颜色
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*/
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private Color getRandColor(int fc, int bc) { // 取得给定范围随机颜色
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final Random random = new Random();
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if (fc > 255) {
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fc = 255;
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}
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if (bc > 255) {
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bc = 255;
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}
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final int r = fc + random.nextInt(bc - fc);
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final int g = fc + random.nextInt(bc - fc);
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final int b = fc + random.nextInt(bc - fc);
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return new Color(r, g, b);
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}
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/**
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* 验证码辅助类
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*/
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enum RandCodeImageEnum {
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/**
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* 混合字符串
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*/
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ALL_CHAR("0123456789abcdefghijkmnpqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"), // 去除小写的l和o这个两个不容易区分的字符；
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/**
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* 字符
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*/
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LETTER_CHAR("abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"),
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/**
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* 小写字母
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*/
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LOWER_CHAR("abcdefghijklmnopqrstuvwxyz"),
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/**
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* 数字
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*/
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NUMBER_CHAR("0123456789"),
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/**
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* 大写字符
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*/
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UPPER_CHAR("ABCDEFGHIJKLMNOPQRSTUVWXYZ");
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/**
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* 待生成的字符串
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*/
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private String charStr;
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/**
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* @param charStr
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*/
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private RandCodeImageEnum(final String charStr) {
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this.charStr = charStr;
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}
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/**
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* 生产随机验证码
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*
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* @param codeLength
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* 验证码的长度
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* @return 验证码
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*/
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public String generateStr(final int codeLength) {
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final StringBuffer sb = new StringBuffer();
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final Random random = new Random();
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final String sourseStr = getCharStr();
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for (int i = 0; i < codeLength; i++) {
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sb.append(sourseStr.charAt(random.nextInt(sourseStr.length())));
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}
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return sb.toString();
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}
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/**
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* @return the {@link #charStr}
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*/
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public String getCharStr() {
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return charStr;
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}
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}
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}
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