Struts2:登录验证码(随机字符串)的实现

来源：互联网发布：武汉大学网络教学平台编辑：程序博客网时间：2024/05/16 11:47

页面代码

<!doctype html><html><head><meta charset="utf-8"><title>验证码实现</title><style>    img{width:100px;}</style><script src="https://apps.bdimg.com/libs/jquery/2.1.4/jquery.min.js"></script><script type="text/javascript">$(function(){     $("#securityCode-img").attr("src","getSecurityCodeImg.action?rmd="+new Date().getTime())     .click(function(){         $(this).attr("src","getSecurityCodeImg.action?rmd="+new Date().getTime());     }); });</script></head><body><span>验证码：</span><img id="securityCode-img"/></body></html>

Action代码

    public class SecurityCodeAction extends ActionSupport{    private int imgWidth;//图片宽度    private int imgHeight;//图片高度    private int codeCount;//验证码个数    private String securityCode;    private Random random=new Random();    public int getImgWidth() {        return imgWidth;    }    public void setImgWidth(int imgWidth) {        this.imgWidth = imgWidth;    }    public int getImgHeight() {        return imgHeight;    }    public void setImgHeight(int imgHeight) {        this.imgHeight = imgHeight;    }    public int getCodeCount() {        return codeCount;    }    public void setCodeCount(int codeCount) {        this.codeCount = codeCount;    }    //注意返回类型为void    public void getSecurityCodeImg() throws IOException{        securityCode=this.getRandomStr(this.getCodeCount());//获取随机验证码        ActionContext.getContext().getSession().put("securityCode", securityCode);//将验证码存入session,以便登录验证时取出比较        HttpServletResponse response=ServletActionContext.getResponse();        response.setDateHeader("Expires", 1L);          response.setHeader("Cache-Control", "no-cache, no-store, max-age=0");        response.addHeader("Pragma", "no-cache");        response.setContentType("image/jpeg");        this.imgRender(securityCode,response.getOutputStream());//根据生成的随机字符串生成图片    }    //获取随机字符串    private String getRandomStr(int count){        String[] strs={"0","1","2","3","4","5","6","7","8","9",                   "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","A","B","C","D","E",                   "F","G","H","I","J","K","L","M","N","O",                   "P","Q","R","S","T","U","V","W","X","Y","Z"};        String result="";        for(int i=0;i<this.getCodeCount();i++){            result+=strs[random.nextInt(strs.length)];        }        return result;    }    //获取随机颜色    private Color getRandomColor(){        Color[] colors=new Color[5];        colors[0]=new Color(32, 158, 25);        colors[1]=new Color(218, 42, 19);        colors[2]=new Color(31, 75, 208);        colors[3]=new Color(0, 102, 182);        colors[4]=new Color(171, 0, 85);        return colors[random.nextInt(5)];    }    //获取随机字体    private Font getRandomFont(){        Font fonts[]=new Font[5];        fonts[0] = new Font("Aharoni", Font.PLAIN, 35);        fonts[1] = new Font("Book Antiqua", Font.PLAIN, 40);        fonts[2] = new Font("Calibri", Font.PLAIN, 37);        fonts[3] = new Font("Lucida Console", Font.PLAIN,39);        fonts[4] = new Font("DilleniaUPC", Font.PLAIN, 34);        return fonts[random.nextInt(5)];    }    //生成验证码图片    private void imgRender(String securityCode,OutputStream out) throws IOException{        BufferedImage bufferedImage=new BufferedImage(                this.getImgWidth(),this.getImgHeight(),BufferedImage.TYPE_BYTE_INDEXED);        Graphics2D g=(Graphics2D)bufferedImage.getGraphics();        g.setColor(Color.WHITE);        g.fillRect(0, 0, this.getImgWidth(), this.getImgHeight());        //画出随机字符串        for(int i=0;i<securityCode.length();i++){            int y=0;            char c=securityCode.charAt(i);            if(i==random.nextInt(this.getCodeCount())){                y=30-random.nextInt(6);            }            else{                y=30+random.nextInt(6);            }            g.setColor(this.getRandomColor());            g.setFont(this.getRandomFont());            g.drawString(String.valueOf(c),25*i+15, y);        }        //随机增加100个点        for(int i=0;i<100;i++){            g.setColor(new Color(random.nextInt(255),random.nextInt(255),random.nextInt(255)));            g.drawOval(random.nextInt(this.getImgWidth()), random.nextInt(this.getImgHeight()),                    0, 0);        }        //随机增加10条线        for(int i=0;i<20;i++){            g.setColor(new Color(random.nextInt(255),random.nextInt(255),random.nextInt(255)));            g.drawLine(random.nextInt(this.getImgWidth()), random.nextInt(this.getImgWidth()),                     random.nextInt(this.getImgHeight()), random.nextInt(this.getImgHeight()));        }        g.dispose();        ImageIO.write(bufferedImage, "jpg", out);    }}

struts配置文件

    <package name="security" extends="struts-default">        <action name="getSecurityCodeImg" class="com.sanwenyu.action.SecurityCodeAction"            method="getSecurityCodeImg">            <param name="imgWidth">130</param>            <param name="imgHeight">36</param>            <param name="codeCount">4</param>        </action>    </package>

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