Java实现Web页面前数字字母验证码实现
Posted liu2020
tags:
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最近公司做项目开发中用到了验证码实现功能,将实现代码分享出来,
前段页面实现代码:
<ul>
<li><label>验证码:</label></li>
<li>
<div>
<input type="text" name="validateCode" class="login_input" value=""/>
<img id="img" src="${baseURL }/validateCode" onclick="onclickValidateCode(this);" />
</div>
</li>
</ul>
为了表达清晰,样式部分代码去掉了,大家根据自己的需求,自己添加样式。
页面JS代码:触发变动验证码改变的JS
<script type="text/javascript" language="javascript">
//请求获取验证码
function onclickValidateCode(obj){
$(obj).attr("src","${baseURL }/validateCode?"+new Date().getTime());
}
</script>
后台 Controller处理:
package com.njcc.pay.controller.login;
import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.p_w_picpath.BufferedImage;
import java.io.IOException;
import java.io.OutputStream;
import java.util.Random;
import javax.p_w_picpathio.ImageIO;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.commons.lang3.math.NumberUtils;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import com.alibaba.dubbo.common.utils.StringUtils;
/**
* 验证马 Controller
*
* @author Administrator
*
*/
@Controller
public class ValidateCodeController {
@SuppressWarnings("unused")
private static final Log LOG = LogFactory.getLog(ValidateCodeController.class);
public static final String VALIDATE_CODE = "validateCode";
private int w = 70;
private int h = 23;
/**
* @throws Exception
* 函数功能说明 : 进入后台登陆页面.
*
* @参数: @return
* @return String
* @throws
*/
@RequestMapping(value = "/validateCode")
public void validateCode(HttpServletRequest request,
HttpServletResponse response) throws Exception {
createImage(request,response);
}
private void createImage(HttpServletRequest request,HttpServletResponse response) throws IOException {
response.setHeader("Pragma", "no-cache");
response.setHeader("Cache-Control", "no-cache");
response.setDateHeader("Expires", 0);
response.setContentType("p_w_picpath/jpeg");
String width = request.getParameter("width");
String height = request.getParameter("height");
if (StringUtils.isNumeric(width) && StringUtils.isNumeric(height)) {
w = NumberUtils.toInt(width);
h = NumberUtils.toInt(height);
}
BufferedImage p_w_picpath = new BufferedImage(w, h, BufferedImage.TYPE_INT_RGB);
Graphics g = p_w_picpath.getGraphics();
/*
* 生成背景
*/
createBackground(g);
/*
* 生成字符
*/
String s = createCharacter(g)