栗子
配置文件
SpringBoot项目中pom.xml文件
项目代码
项目结构
SpringBootVerifyCodeApplication.java
VerifyCodeConfig.java
KaptchaController.java
测试
生成运算符验证码
1、设置字符个数为7
2、获取图片
3、演示一下
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是所有系统都绕不开的一道坎,很多系统会在用户名和密码下发放置一个图形验证码,例如:
这些图形验证码看起来不仅很丑,而且模糊,但却是保护系统的第一道屏障,它的作用是:设计的初衷其实就是为了防自动化,防止一些人利用自动工具恶意攻击网站,比如批量注册,撑爆你的数据库。
实现这个功能并不复杂,但是为了不让大家重复造轮子,这里我给大家推荐一个现成的轮子:kaptcha
,使用起来非常简单,废话不多说直接上代码。
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.7.1</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<groupId>com.example</groupId>
<artifactId>SpringBoot-VerifyCode</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>SpringBoot-VerifyCode</name>
<description>Demo project for Spring Boot</description>
<properties>
<java.version>1.8</java.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<!-- 验证码生成包 -->
<dependency>
<groupId>com.github.penggle</groupId>
<artifactId>kaptcha</artifactId>
<version>2.3.2</version>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
项目代码
项目结构
SpringBootVerifyCodeApplication.java
package com.example.springbootverifycode;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
@SpringBootApplication
public class SpringBootVerifyCodeApplication {
public static void main(String[] args) {
SpringApplication.run(SpringBootVerifyCodeApplication.class, args);
}
}
VerifyCodeConfig.java
package com.example.springbootverifycode.config;
import com.google.code.kaptcha.Producer;
import com.google.code.kaptcha.impl.DefaultKaptcha;
import com.google.code.kaptcha.util.Config;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import java.util.Properties;
@Configuration
public class VerifyCodeConfig {
@Bean
Producer producer() {
Properties properties = new Properties();
//设置图片边框
properties.setProperty("kaptcha.border", "yes");
//设置图片边框为蓝色
properties.setProperty("kaptcha.border.color", "blue");
//背景颜色渐变开始
properties.put("kaptcha.background.clear.from", "127,255,212");
//背景颜色渐变结束
properties.put("kaptcha.background.clear.to", "240,255,255");
// 字体颜色
properties.put("kaptcha.textproducer.font.color", "black");
// 文字间隔
properties.put("kaptcha.textproducer.char.space", "10");
//如果需要去掉干扰线
properties.put("kaptcha.noise.impl", "com.google.code.kaptcha.impl.NoNoise");
// 字体
properties.put("kaptcha.textproducer.font.names", "Arial,Courier,cmr10,宋体,楷体,微软雅黑");
// 图片宽度
properties.setProperty("kaptcha.image.width", "200");
// 图片高度
properties.setProperty("kaptcha.image.height", "50");
// 从哪些字符中产生
properties.setProperty("kaptcha.textproducer.char.string", "0123456789abcdefghijklmnopqrsduvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ");
// 字符个数
properties.setProperty("kaptcha.textproducer.char.length", "6");
DefaultKaptcha defaultKaptcha = new DefaultKaptcha();
defaultKaptcha.setConfig(new Config(properties));
return defaultKaptcha;
}
}
KaptchaController.java
package com.example.springbootverifycode.controller;
import com.google.code.kaptcha.Producer;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;
import javax.imageio.ImageIO;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.awt.image.BufferedImage;
import java.io.IOException;
@RestController
public class KaptchaController {
@Autowired
private Producer producer;
@GetMapping("/getVerifyCode")
public void getVerifyCode(HttpServletResponse response, HttpSession session) throws IOException {
response.setContentType("image/jpeg");
String text = producer.createText();
session.setAttribute("vf", text);
BufferedImage image = producer.createImage(text);
try (ServletOutputStream sos = response.getOutputStream()) {
ImageIO.write(image, "jpg", sos);
}
}
}
测试
生成运算符验证码
1、设置字符个数为7
// 文字个数
properties.put("kaptcha.textproducer.char.space", "7");
2、获取图片
@GetMapping("/getCal")
public void getCal(HttpServletResponse response, HttpSession session) throws IOException {
response.setContentType("image/jpeg");
//生成文字验证码
String text = producer.createText();
System.out.println("当前生成的字符串为:" + text);
//个位数字相加
String s1 = text.substring(0, 2);
String s2 = text.substring(2, 4);
int count = Integer.valueOf(s1).intValue() + Integer.valueOf(s2).intValue();
System.out.println("计算结果为:" + count);
//生成图片验证码
BufferedImage image = producer.createImage(s1 + "+" + s2 + "=?");
try (ServletOutputStream sos = response.getOutputStream()) {
ImageIO.write(image, "jpg", sos);
}
}
3、演示一下
后台打印:
访问链接:
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