Java springMVC生成验证码工具类

Java springMVC生成验证码工具类

1.源文件

ImgCheckCode.java

import java.awt.*;
import java.awt.image.BufferedImage;
import java.util.Random;

/**
 * 用于生成图片验证码
 */
public class ImgCheckCode {
    private int width = 125;// 定义图片的width
    private int height = 30;// 定义图片的height
    private int codeCount = 4;// 定义图片上显示验证码的个数
    private int xx = 25;//字符间距
    private int fontHeight = 28;//字符高度
    private int codeY = 26;//字符Y轴高度
    private char[] codeSequence = { 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X',
            'Y', 'Z', '1', '2', '3', '4', '5', '6', '7', '8', '9' };

    public int getWidth() {
        return width;
    }

    public void setWidth(int width) {
        this.width = width;
    }

    public int getHeight() {
        return height;
    }

    public void setHeight(int height) {
        this.height = height;
    }

    public int getCodeCount() {
        return codeCount;
    }

    public void setCodeCount(int codeCount) {
        this.codeCount = codeCount;
    }

    public int getXx() {
        return xx;
    }

    public void setXx(int xx) {
        this.xx = xx;
    }

    public int getFontHeight() {
        return fontHeight;
    }

    public void setFontHeight(int fontHeight) {
        this.fontHeight = fontHeight;
    }

    public int getCodeY() {
        return codeY;
    }

    public void setCodeY(int codeY) {
        this.codeY = codeY;
    }

    public char[] getCodeSequence() {
        return codeSequence;
    }

    public void setCodeSequence(char[] codeSequence) {
        this.codeSequence = codeSequence;
    }

    /**
     * @return 根据codeCount生成指定长度的字符
     */
    public String getRandomCodeStr(){
        // 创建一个随机数生成器类
        Random random = new Random();
        StringBuffer result=new StringBuffer();
        for(int i=0;i

2.调用方式

springMvc调用方法

首先定义生成验证码图片的controller和URL

CodeController.java

@Controller
@RequestMapping("/util")
public class CodeController {
    public static String CODE_SESSION_NAME="imgCode";

    /**
     * 生成验证码
     */
    @RequestMapping("/getCodeImg")
    public void getCode(HttpServletRequest request, HttpServletResponse response) throws IOException {
        ImgCheckCode imgCheckCode=new ImgCheckCode();
        String code=imgCheckCode.getRandomCodeStr();
        BufferedImage buffImg= imgCheckCode.getImgCode(code);
        System.out.println("Code is " +code);
        // 将四位数字的验证码保存到Session中。
        HttpSession session = request.getSession();
        session.setAttribute(CODE_SESSION_NAME,code);
        // 禁止图像缓存。
        response.setHeader("Pragma", "no-cache");
        response.setHeader("Cache-Control", "no-cache");
        response.setDateHeader("Expires", 0);
        response.setContentType("image/jpeg");
        // 将图像输出到Servlet输出流中。
        ServletOutputStream sos = response.getOutputStream();
        ImageIO.write(buffImg, "jpeg", sos);
        sos.close();
    }

    /**
     * 检查提交的验证码是否正确
     */
    @RequestMapping(value ="/checkCode ", produces = "text/json;charset=UTF-8")
    @ResponseBody//使用@ResponseBody 注解返回响应体 直接将返回值序列化json
    public  String checkCode(HttpServletRequest request , String code){
        boolean result=false;
        String sessionCode=request.getSession().getAttribute(CODE_SESSION_NAME).toString();
        code=code.toUpperCase();
        if(sessionCode.equals(code)){
            result=true;
        }else{
            result=false;
        }
        String jsonString= JSON.toJSONString(result);
        return jsonString;
    }


}

这里我定义的url是 util/getCodeImg,访问连接xxx/util/getCodeImg，即可看到验证码图片

验证验证码是否正确

访问xxx/util/getCodeImg?checkCode=ABCD,即可看验证结果

参考：https://www.cnblogs.com/AdamFamily/p/6379676.html