spring boot + vue + 图片验证码 登录实例( 从菜鸟到小白 )
spring boot 实现验证数据库登录 + 图片验证码登录1. 先创建个数据库数据库大概就是这个样子（表名先叫 user ）2. 在项目里面写好dao- entity…等等一系列东西 我这里就不一一列出来了（大概就是这个样子）在dao 里面写上 验证 账号 密码的语句//登录@Query(value = "select * from user where uname=:un...
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spring boot 实现验证数据库登录 + 图片验证码登录
1. 先创建个数据库
数据库大概就是这个样子（表名先叫 user ）
2. 在项目里面写好dao- entity…等等一系列东西 我这里就不一一列出来了（大概就是这个样子）
在dao 里面写上 验证 账号 密码的语句
//登录
@Query(value = "select * from user where uname=:uname and pwd=:pwd",nativeQuery = true)
User findLogin(String uname,String pwd);
然后在service 里面创建 方法
//登录
public User findLogin(String uname,String pwd) {
return userDao.findLogin(uname, pwd);
}
写一个html登录模板 (css 就是不写了)
<form action="#" method="post" name="f1">
<div class="panel loginbox">
<div class="text-center margin-big padding-big-top"><h1>后台管理中心</h1></div>
<div class="panel-body" style="padding:30px; padding-bottom:10px; padding-top:10px;">
<div class="form-group">
<div class="field field-icon-right">
<input type="text" class="input input-big" name="name" v-model="uname" placeholder="登录账号" data-validate="required:请填写账号" value='' />
<span class="icon icon-user margin-small"></span>
</div>
</div>
<div class="form-group">
<div class="field field-icon-right">
<input type="password" class="input input-big" v-model="pwd" name="pwd" placeholder="登录密码" data-validate="required:请填写密码" />
<span class="icon icon-key margin-small"></span>
</div>
</div>
<div class="form-group">
<div class="field">
<input type="text" class="input input-big" name="code" v-model="code" placeholder="填写右侧的验证码" />
<img src="/user/yzm" alt="" width="100" height="32" class="passcode" style="height:43px;cursor:pointer;" onclick="this.src=this.src+'?'">
<!--点击事件是换一下-->
</div>
</div>
</div>
<div style="padding:30px;"><input type="button" class="button button-block bg-main text-big input-big" name="submit" v-on:click="login()" value="登录"></div>
</div>
</form>
vue 相关代码
<script>
var vm = new Vue({
el:"#app",
data:{
uname:"",
pwd:"",
code:"",
},
mounted(){
},
methods:{
login:function(){
$.post("/user/dologin",{uname:this.uname,pwd:this.pwd,code:this.code},function(json){
if (json.succes==1) {
alert(json.info); //弹出登录状态
window.location.href="/admin/index"; //跳转到相关界面
}else {
alert(json.info);
}
});
},
}
});
</script>
实体类 相关代码
//登录映射
@RequestMapping(value = "login")
public String login() {
return "demo/index/login";
}
//登录验证
@RequestMapping(value = "dologin")
@ResponseBody
public JSONObject dologin(HttpServletRequest request,Model model) {
HttpSession session = request.getSession();
JSONObject json = new JSONObject();
String uname = request.getParameter("uname"); //获取ajax传过来的uname
String pwd = request.getParameter("pwd");
String code = request.getParameter("code").toLowerCase();
if (!code.equals(session.getAttribute("verCode"))) {
json.put("succes", 3);
json.put("info", "验证码不正确！");
return json;
}
User user = userService.findLogin(uname, pwd);
if (user == null ||user.equals("") ) {
json.put("succes", 2);
json.put("info", "用户名或者验证码错误！");
} else {
json.put("succes", 1);
session.setAttribute("name", uname);
json.put("info", "登录成功！");
}
return json;
}
//生成验证码
@RequestMapping(value = "yzm")
public void yzm(HttpServletRequest request,HttpServletResponse response) throws IOException {
response.setHeader("Pragma", "No-cache");
response.setHeader("Cache-Control", "no-cache");
response.setDateHeader("Expires", 0);
response.setContentType("image/jpeg");
// 生成随机字串
String verifyCode = VerifyCodeUtils.generateVerifyCode(4);
// 存入会话session
HttpSession session = request.getSession(true);
// 删除以前的
session.removeAttribute("verCode");
session.removeAttribute("codeTime");
session.setAttribute("verCode", verifyCode.toLowerCase()); //生成session
session.setAttribute("codeTime", LocalDateTime.now());
// 生成图片
int w = 100, h = 30;
OutputStream out = response.getOutputStream();
VerifyCodeUtils.outputImage(w, h, out, verifyCode);
}
生成验证的工具包
package com.admin.demo.utli;
import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.RenderingHints;
import java.awt.geom.AffineTransform;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.util.Arrays;
import java.util.Random;
import javax.imageio.ImageIO;
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 = "0123456789ABCDEFGHJKLMNPQRSTUVWXYZ";
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();
}
/**
* 生成随机验证码文件,并返回验证码值
* @param w
* @param h
* @param outputFile
* @param verifySize
* @return
* @throws IOException
*/
public static String outputVerifyImage(int w, int h, File outputFile, int verifySize) throws IOException{
String verifyCode = generateVerifyCode(verifySize);
outputImage(w, h, outputFile, verifyCode);
return verifyCode;
}
/**
* 输出随机验证码图片流,并返回验证码值
* @param w
* @param h
* @param os
* @param verifySize
* @return
* @throws IOException
*/
public static String outputVerifyImage(int w, int h, OutputStream os, int verifySize) throws IOException{
String verifyCode = generateVerifyCode(verifySize);
outputImage(w, h, os, verifyCode);
return verifyCode;
}
/**
* 生成指定验证码图像文件
* @param w
* @param h
* @param outputFile
* @param code
* @throws IOException
*/
public static void outputImage(int w, int h, File outputFile, String code) throws IOException{
if(outputFile == null){
return;
}
File dir = outputFile.getParentFile();
if(!dir.exists()){
dir.mkdirs();
}
try{
outputFile.createNewFile();
FileOutputStream fos = new FileOutputStream(outputFile);
outputImage(w, h, fos, code);
fos.close();
} catch(IOException e){
throw e;
}
}
/**
* 输出指定验证码图片流
* @param w
* @param h
* @param os
* @param code
* @throws IOException
*/
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 = 0.1f;// 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);
}
}
}
}
下面是效果图
完结！！！！
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