java绘图相关类
验证码工具类
package dt2008.util;
import javax.imageio.ImageIO;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.util.Random;
/**
* 验证码工具类
*/
public class RandomValidateCodeUtil {
//定义随机类
private Random random = new Random();
public void code(HttpServletRequest request, HttpServletResponse response){
//1.创建缓存图片类
//构造方法：new BufferedImage(int width,int height,int model)
BufferedImage image = new BufferedImage(150,50,BufferedImage.TYPE_INT_RGB);
//2.获取画笔
Graphics g = image.getGraphics();
//3.设置画笔颜色
g.setColor(Color.white);//白色
//4.填充矩形
//g.fillRect(x,y,width,height); x,y 起点的坐标，width矩形宽度，height矩形的高度
g.fillRect(0,0,150,50);
//5.画矩形边框
//设置画笔颜色(边框的颜色)
g.setColor(Color.blue);//蓝色
//画边框的语法：g.drawRect(x,y,width,height); x,y 起点的坐标，width边框宽度，height边框的高度
g.drawRect(1,1,147,47);
//6.画4条干扰线
//画直线语法：g.drawLine(x1,y1,x2,y2); x1,y1 线的起点坐标，x2,y2先的终点坐标
for (int i = 0; i < 4; i++) {
//设置画笔为随机颜色
g.setColor(getRandomColor());
//随机获取2个点
int x1 = random.nextInt(147)+1;
int y1 = random.nextInt(47)+1;
int x2 = random.nextInt(147)+1;
int y2 = random.nextInt(47)+1;
//画直线
g.drawLine(x1,y1,x2,y2);
}
//7.画验证码字符串
String checkCodeScope = "qwertyupasdfghjkzxcvbnm";
//定义接收拼接随机获取到的验证码字符变量
StringBuilder checkCodeBuilder = new StringBuilder();
//循环随机获取4个验证码字符
for (int i = 0; i < 4; i++) {
//获取随机位置
int index = random.nextInt(checkCodeScope.length());
//根据位置获取字符
char c = checkCodeScope.charAt(index);
//checkCodeBuilder拼接获取的随机字符
checkCodeBuilder.append(c);
//设置画笔的字体
//字符构造方法：new Font(字体，样式，大小)
g.setFont(new Font("微软雅黑",Font.BOLD,20));
//将每个字符画到图片上
//语法：g.drawString(字符串,x,y);
g.drawString(c+"",30+i*30,30);
}
request.getSession().setAttribute("SESSION_CHECKCODE", checkCodeBuilder.toString());
//8.将验证码图片输出给浏览器
//输出缓存图片的语法：ImageIO.write(缓存图片,图片的格式,输出给浏览器的字节流);
try {
ImageIO.write(image,"png",response.getOutputStream());
} catch (IOException e) {
e.printStackTrace();
}
}
//获取随机的颜色
private Color getRandomColor(){
int r = random.nextInt(256);
int g = random.nextInt(256);
int b = random.nextInt(256);
//构造方法语法：new Color(int r,int g,int b) //由红、绿、蓝组成， 每个颜色值范围0~255
return new Color(r,g,b);
}
}
Controller(生成验证码)
package yingshi.web;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;
import yingshi.util.RandomValidateCodeUtil;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.io.IOException;
/**
* 登录以及验证码
*/
@RestController
@RequestMapping("login/admin")
public class LoginController {
/**
* 生成验证码
*/
@RequestMapping("getVerify")
public void getVerify(HttpServletRequest request, HttpServletResponse response) {
RandomValidateCodeUtil randomValidateCodeUtil = new RandomValidateCodeUtil();
randomValidateCodeUtil.code(request, response);
}
}
这时，可以访问验证码了，可以在前端那写个js点击切换验证码
接下来就是校验验证码(注意：是分大小写的)
package yingshi.web;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;
import yingshi.util.RandomValidateCodeUtil;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.io.IOException;
/**
* 登录以及验证码
*/
@RestController
@RequestMapping("login/admin")
public class LoginController {
/**
* 校验后台登录
*/
@RequestMapping("checkVerify")
public String checkVerify(String username, String password, String verifyInput, HttpServletRequest request, HttpServletResponse response) {
//验证码校验
//获取session中的验证码
String sessionCheckCode = (String) request.getSession().getAttribute("SESSION_CHECKCODE");
//判断验证码是否正确
if(!verifyInput.equals(sessionCheckCode)){
return "错误";
}else{
return "正确";
}
}
}
希望这篇文章对您有帮助！
