자바 그래 픽 인증 코드 구현 사례

배경 생 성 인증 코드 부분

package com.jr.p2p.login.rest;
import java.awt.Color;        
import java.awt.Font;        
import java.awt.Graphics2D;        
import java.awt.image.BufferedImage;        
import java.util.Random;        

import javax.imageio.ImageIO;        
import javax.servlet.ServletException;        
import javax.servlet.ServletOutputStream;        
import javax.servlet.http.HttpServlet;        
import javax.servlet.http.HttpServletRequest;        
import javax.servlet.http.HttpServletResponse;        
import javax.servlet.http.HttpSession; 

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;

@RestController
public class ValidateCodeController extends HttpServlet {
	
	private static final long serialVersionUID = 1L;
  //         。        
    private int width = 50;        
    //         。        
    private int height = 20;        
    //                
    private int codeCount = 4;        
    private int x = 0;        
    //             
    private int fontHeight;        
    private int codeY;        
    char[] codeSequence = {'1', '2', '3', '4', '5', '6', '7', '8', '9' };
    
    
    @RequestMapping(value="verifyCode",method=RequestMethod.GET)
    public void service(HttpServletRequest req, HttpServletResponse resp,HttpSession session)        
            throws ServletException, java.io.IOException {
        initImage();
        //     buffer        
        BufferedImage buffImg = new BufferedImage(width, height,        
                BufferedImage.TYPE_INT_RGB);        
        Graphics2D g = buffImg.createGraphics();        
        //                    
        Random random = new Random();        
        //                 
        g.setColor(Color.WHITE);        
        g.fillRect(0, 0, width, height);        
        //     ，                。        
        Font font = new Font("Fixedsys", Font.PLAIN, fontHeight);        
        //     。        
        g.setFont(font);        
        //    。        
        g.setColor(Color.LIGHT_GRAY);        
        g.drawRect(0, 0, width - 1, height - 1);        
        //     10    ，                  。        
        g.setColor(Color.BLACK);        
        for (int i = 0; i < 10; i++) {        
            int x = random.nextInt(width);        
            int y = random.nextInt(height);        
            int xl = random.nextInt(12);        
            int yl = random.nextInt(12);        
            g.drawLine(x, y, x + xl, y + yl);        
        }        
        // randomCode            ，           。        
        StringBuffer randomCode = new StringBuffer();        
        int red = 0, green = 0, blue = 0;        
        //     codeCount      。        
        for (int i = 0; i < codeCount; i++) {        
            //             。        
            String strRand = String.valueOf(codeSequence[random.nextInt(9)]);        
            //                ，                 。        
            red = random.nextInt(255);        
            green = random.nextInt(255);        
            blue = random.nextInt(255);        
            //                   。        
            g.setColor(new Color(red, green, blue));        
            g.drawString(strRand, (i + 1) * x, codeY);        
            //               。        
            randomCode.append(strRand);        
        }        
        //             Session 。               
        session.setAttribute("validateCode", randomCode.toString());
        //       。        
        resp.setHeader("Pragma", "no-cache");        
        resp.setHeader("Cache-Control", "no-cache");        
        resp.setDateHeader("Expires", 0);        
        resp.setContentType("image/jpeg");        
        //       Servlet    。        
        ServletOutputStream sos = resp.getOutputStream();        
        ImageIO.write(buffImg, "jpeg", sos);        
        sos.close();        
    }
    
    /**
     * 
     * @param inputCode        
     * @return 1:        0：     
     */
    @RequestMapping(value="validateVerifycode",method=RequestMethod.POST)
    public int validateCode(@RequestParam("inputCode")String inputCode,HttpSession session){
    	if(inputCode.equalsIgnoreCase((String)session.getAttribute("validateCode"))){
    		return 1;
    	}else {
			return 0;
		}
    }
    
    /**      
     *                
     */       
    public void initImage() throws ServletException {        
        //  web.xml               
        //           
        String strWidth ="80";        
        //           
        String strHeight ="30";        
        //             
        String strCodeCount = "4";        
        //                    
        try {        
            if (strWidth != null && strWidth.length() != 0) {        
                width = Integer.parseInt(strWidth);        
            }        
            if (strHeight != null && strHeight.length() != 0) {        
                height = Integer.parseInt(strHeight);        
            }        
            if (strCodeCount != null && strCodeCount.length() != 0) {        
                codeCount = Integer.parseInt(strCodeCount);        
            }        
        } catch (NumberFormatException e) {        
        }        
        x = width / (codeCount + 2);        
        fontHeight = height - 2;        
        codeY = height - 4;        
    }  
}

 
 

프론트 데스크 에서 도형 인증 코드 부분 을 가 져 옵 니 다

<li id="verifycodeLi">
                <label>   </label>
                <input tabindex="3" type="text" id="verifycode" name="verifycode" class="input" maxlength="4" style="width:80px" onblur="checkVerifyCode()" onfocus="hideVerifyCode()">
                <img id="imgverCode" src="/rest/verifyCode" onclick="coderefresh()" width="74" height="42" alt="   " title="   " class="authcode"> 
				<a href="javascript:void(0)" onclick="coderefresh()" class="refcode r3">
				<i class="icons refresh-todo"></i><b>  </b></a> 
                <input type="hidden" id="imgverCodeIsOk" value="">
            </li>

 
 
js 검증 부분

//     
function checkVerifyCode(){
	var tip = $("#tip");
	var inputCode=$("#verifycode").val();
	jQuery.ajax({
		async : true,
		data : {inputCode: inputCode},
		dataType : "json",
		url : "/rest/validateVerifycode",
		type : "POST",
		success : function(data)
		{
			if(data==0){
				tip.html("      ！");
		        tipShow();
			}else{
				tipHide();
			}
	        $("#imgverCodeIsOk").val(data);
		}
	});
}