标签：return String 验证 int 分离 验证码 发送 static new
1.如何保证同一浏览器保存的内容相同
请求图片验证码之前判断SessionStorage是否有KEY,如果没就创建，然后保存SessionStorage,如果有自己直接作为参数发送Ajax请求获取图片验证码
- 前端通过ajax发送一个图片验证码请求,携带者KEY
- 后端收到请求，生成图片验证码的值
- 把图片验证码的值存储到Redis，以前段传入的key作为Redis的key
- 把图片验证码的值合并到一个图片中
- 把图片基于Base64编码层字符串，响应给前端
- 前端拿到base64字符串，进行图片的展示，用户输入图片验证码
- 前台提交注册请求 ，验证图片验证码(key也要携带)，后端把前端传入的图片验证码的值和Redis中的图片验证码的值做比
@Override
public String imageCode(String key) {
if(StringUtils.isEmpty(key)){
throw new RuntimeException("验证码获取失败,请刷新页面重试");
}
//1.请求图片验证码之前判断SessionStorage是否有KEY,
// 如果没就创建，然后保存SessionStorage,如果有自己直接作为参数发送Ajax请求获取图片验证码
//2.前端通过ajax发送一个图片验证码请求,携带者KEY
//3.后端收到请求，生成图片验证码的值
//4.把图片验证码的值存储到Redis，以前段传入的key作为Redis的key
//生成随机数
String randomString = StrUtils.getComplexRandomString(4);
try {
String verifyCode = VerifyCodeUtils.VerifyCode(150, 50, randomString);
AjaxResult setex = redisFegin.setex(key, 10000, randomString);
if (!setex.isSuccess()){
throw new RuntimeException("图片保存失败");
}
return verifyCode;
} catch (IOException e) {
throw new RuntimeException("图片保存Redis失败");
}
}
View Code
还有两个工具类
一个生成随机数
package cn.jiedada.hrm.util;
import java.util.ArrayList;
import java.util.List;
import java.util.Random;
/**
* @author yaohuaipeng
* @date 2018/10/26-16:16
*/
public class StrUtils {
/**
* 把逗号分隔的字符串转换字符串数组
*
* @param str
* @return
*/
public static String[] splitStr2StrArr(String str,String split) {
if (str != null && !str.equals("")) {
return str.split(split);
}
return null;
}
/**
* 把逗号分隔字符串转换List的Long
*
* @param str
* @return
*/
public static List<Long> splitStr2LongArr(String str) {
String[] strings = splitStr2StrArr(str,",");
if (strings == null) return null;
List<Long> result = new ArrayList<>();
for (String string : strings) {
result.add(Long.parseLong(string));
}
return result;
}
/**
* 把逗号分隔字符串转换List的Long
*
* @param str
* @return
*/
public static List<Long> splitStr2LongArr(String str,String split) {
String[] strings = splitStr2StrArr(str,split);
if (strings == null) return null;
List<Long> result = new ArrayList<>();
for (String string : strings) {
result.add(Long.parseLong(string));
}
return result;
}
public static String getRandomString(int length) {
String str = "0123456789";
Random random = new Random();
StringBuffer sb = new StringBuffer();
for (int i = 0; i < length; i++) {
int number = random.nextInt(10);
sb.append(str.charAt(number));
}
return sb.toString();
}
public static String getComplexRandomString(int length) {
String str = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
Random random = new Random();
StringBuffer sb = new StringBuffer();
for (int i = 0; i < length; i++) {
int number = random.nextInt(62);
sb.append(str.charAt(number));
}
return sb.toString();
}
public static String convertPropertiesToHtml(String properties){
//1:容量:6:32GB_4:样式:12:塑料壳
StringBuilder sBuilder = new StringBuilder();
String[] propArr = properties.split("_");
for (String props : propArr) {
String[] valueArr = props.split(":");
sBuilder.append(valueArr[1]).append(":").append(valueArr[3]).append("<br>");
}
return sBuilder.toString();
}
}
View Code
一个生成图片的工具类（这里也可以接入第三方）
前端不可以接收String转化为图片但可以通过base64的String转为图片，这里我们工具类里面就可以生成前端能够直接转化为图片的参数
package cn.jiedada.hrm.util;
import sun.misc.BASE64Encoder;
import javax.imageio.ImageIO;
import java.awt.*;
import java.awt.geom.AffineTransform;
import java.awt.image.BufferedImage;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.util.Arrays;
import java.util.Random;
/**
* Created by Wzy
* on 2018/5/11
*/
public class VerifyCodeUtils {
//使用到Algerian字体，系统里没有的话需要安装字体，字体只显示大写，去掉了1,0,i,o几个容易混淆的字符
public static final String VERIFY_CODES = "23456789ABCDEFGHJKLMNPQRSTUVWXYZ";
private static Random random = new Random();
/**
* 使用系统默认字符源生成验证码
*
* @param verifySize 验证码长度
* @return
*/
public static String generateVerifyCode(int verifySize) {
return generateVerifyCode(verifySize, VERIFY_CODES);
}
/**
* 使用指定源生成验证码
*
* @param verifySize 验证码长度
* @param sources 验证码字符源
* @return
*/
public static String generateVerifyCode(int verifySize, String sources) {
if (sources == null || sources.length() == 0) {
sources = VERIFY_CODES;
}
int codesLen = sources.length();
Random rand = new Random(System.currentTimeMillis());
StringBuilder verifyCode = new StringBuilder(verifySize);
for (int i = 0; i < verifySize; i++) {
verifyCode.append(sources.charAt(rand.nextInt(codesLen - 1)));
}
return verifyCode.toString();
}
/**
* 输出指定验证码图片流
*
*/
public static void outputImage(int w, int h, OutputStream os, String code) throws IOException {
int verifySize = code.length();
BufferedImage image = new BufferedImage(w, h, BufferedImage.TYPE_INT_RGB);
Random rand = new Random();
Graphics2D g2 = image.createGraphics();
g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
Color[] colors = new Color[5];
Color[] colorSpaces = new Color[]{Color.WHITE, Color.CYAN,
Color.GRAY, Color.LIGHT_GRAY, Color.MAGENTA, Color.ORANGE,
Color.PINK, Color.YELLOW};
float[] fractions = new float[colors.length];
for (int i = 0; i < colors.length; i++) {
colors[i] = colorSpaces[rand.nextInt(colorSpaces.length)];
fractions[i] = rand.nextFloat();
}
Arrays.sort(fractions);
g2.setColor(Color.GRAY);// 设置边框色
g2.fillRect(0, 0, w, h);
Color c = getRandColor(200, 250);
g2.setColor(c);// 设置背景色
g2.fillRect(0, 2, w, h - 4);
//绘制干扰线
Random random = new Random();
g2.setColor(getRandColor(160, 200));// 设置线条的颜色
for (int i = 0; i < 20; i++) {
int x = random.nextInt(w - 1);
int y = random.nextInt(h - 1);
int xl = random.nextInt(6) + 1;
int yl = random.nextInt(12) + 1;
g2.drawLine(x, y, x + xl + 40, y + yl + 20);
}
// 添加噪点
float yawpRate = 0.05f;// 噪声率
int area = (int) (yawpRate * w * h);
for (int i = 0; i < area; i++) {
int x = random.nextInt(w);
int y = random.nextInt(h);
int rgb = getRandomIntColor();
image.setRGB(x, y, rgb);
}
shear(g2, w, h, c);// 使图片扭曲
g2.setColor(getRandColor(100, 160));
int fontSize = h - 4;
Font font = new Font("Algerian", Font.ITALIC, fontSize);
g2.setFont(font);
char[] chars = code.toCharArray();
for (int i = 0; i < verifySize; i++) {
AffineTransform affine = new AffineTransform();
affine.setToRotation(Math.PI / 4 * rand.nextDouble() * (rand.nextBoolean() ? 1 : -1), (w / verifySize) * i + fontSize / 2, h / 2);
g2.setTransform(affine);
g2.drawChars(chars, i, 1, ((w - 10) / verifySize) * i + 5, h / 2 + fontSize / 2 - 10);
}
g2.dispose();
ImageIO.write(image, "jpg", os);
}
private static Color getRandColor(int fc, int bc) {
if (fc > 255)
fc = 255;
if (bc > 255)
bc = 255;
int r = fc + random.nextInt(bc - fc);
int g = fc + random.nextInt(bc - fc);
int b = fc + random.nextInt(bc - fc);
return new Color(r, g, b);
}
private static int getRandomIntColor() {
int[] rgb = getRandomRgb();
int color = 0;
for (int c : rgb) {
color = color << 8;
color = color | c;
}
return color;
}
private static int[] getRandomRgb() {
int[] rgb = new int[3];
for (int i = 0; i < 3; i++) {
rgb[i] = random.nextInt(255);
}
return rgb;
}
private static void shear(Graphics g, int w1, int h1, Color color) {
shearX(g, w1, h1, color);
shearY(g, w1, h1, color);
}
private static void shearX(Graphics g, int w1, int h1, Color color) {
int period = random.nextInt(2);
boolean borderGap = true;
int frames = 1;
int phase = random.nextInt(2);
for (int i = 0; i < h1; i++) {
double d = (double) (period >> 1)
* Math.sin((double) i / (double) period
+ (6.2831853071795862D * (double) phase)
/ (double) frames);
g.copyArea(0, i, w1, 1, (int) d, 0);
if (borderGap) {
g.setColor(color);
g.drawLine((int) d, i, 0, i);
g.drawLine((int) d + w1, i, w1, i);
}
}
}
private static void shearY(Graphics g, int w1, int h1, Color color) {
int period = random.nextInt(40) + 10; // 50;
boolean borderGap = true;
int frames = 20;
int phase = 7;
for (int i = 0; i < w1; i++) {
double d = (double) (period >> 1)
* Math.sin((double) i / (double) period
+ (6.2831853071795862D * (double) phase)
/ (double) frames);
g.copyArea(i, 0, 1, h1, 0, (int) d);
if (borderGap) {
g.setColor(color);
g.drawLine(i, (int) d, i, 0);
g.drawLine(i, (int) d + h1, i, h1);
}
}
}
/**
* 获取随机验证码及其加密图片
* 使用BASE64编码
* 返回一个BASE64
*/
public static String VerifyCode(int w, int h, int size) throws IOException {
BASE64Encoder encoder = new BASE64Encoder();
String code = generateVerifyCode(size).toLowerCase();
ByteArrayOutputStream data = new ByteArrayOutputStream();
outputImage(w, h, data, code);
return encoder.encode(data.toByteArray());
}
/**
* 传入参数获得对应的图片验证
*
*/
public static String VerifyCode(int w, int h, String code) throws IOException {
BASE64Encoder encoder = new BASE64Encoder();
ByteArrayOutputStream data = new ByteArrayOutputStream();
outputImage(w, h, data, code);
return encoder.encode(data.toByteArray());
}
public static void main(String[] args) throws Exception{
System.out.println(VerifyCode(100, 30, 6));
}
}
View Code
标签：return,String,验证,int,分离,验证码,发送,static,new 来源： https://www.cnblogs.com/xiaoruirui/p/13710095.html
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