需要相關的jar包
jsp頁面
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<title>驗證碼</title>
<script type="text/javascript" src="js/jquery-3.1.0.min.js"></script>
<link href="css/index.css" rel="stylesheet">
<script type="text/javascript">
function changeImg() {
var imgSrc = $("#imgObj");
imgSrc.attr("src", chgUrl("code.html"));
}
function chgUrl(url) {
var timestamp = (new Date()).valueOf();
if ((url.indexOf("&") >= 0)) {
url = url + "×tamp=" + timestamp;
} else {
url = url + "?timestamp=" + timestamp;
}
return url;
}
$(function() {
//文本框點擊事件
$("input[name='code']").blur(function(){
//發送ajax請求
$.ajax({
type:"POST",
url:"checkCode",
data:{
code:$("input[name='code']").val()
},
dataType:"json",
success:function(data){
//清空
$("#showRet").empty();
if(data.admin=="1"){
//將接收到的數據顯示到文本框
$("#showRet").text("驗證碼正確").css("color","black");
}else if(data.admin=="0"){
$("#showRet").text("請輸入驗證碼").css("color","red");
}else{
$("#showRet").text("驗證碼錯誤").css("color","red");
}
},
})
})
})
</script>
</head>
<body>
<form action="toAccess" method="post">
<div id="box">
<ul>
<li class="center">SpringMVC4.0 + MyBatis3.2 + 驗證碼</li>
</ul>
<ul>
<li class="left">輸入您的郵箱:<input type="text" name="sendto" value=""/></li>
</ul>
<ul>
<li class="left">輸入消息內容:<input type="text" name="content" value=""/></li>
</ul>
<ul>
<li class="left">輸入驗證碼吧:
<input type="text" name="code" />
<img id="imgObj" οnclick="javascript:changeImg()" src="code.html" />
</li>
</ul>
<ul>
<li class="left">後臺返回數據:<input type="text" value="" readonly="readonly"/></li>
</ul>
<input type="submit" id="send" value="發送郵件" />
<span id="showRet"></span>
</div>
</form>
</body>
</html>
CodeController頁面
package com.cng.controller;
import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;
import java.util.Random;
import javax.imageio.ImageIO;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;
@Controller
public class CodeController {
private int width = 90;//定義圖片的width
private int height = 24;//定義圖片的height
private int codeCount = 4;//定義圖片上顯示驗證碼的個數
private int xx = 15;
private int fontHeight = 18;
private int codeY = 18;
char[] codeSequence = { 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'J',
'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W',
'X', 'Y', 'Z', '0', '2', '3', '4', '5', '6', '7', '8', '9' };
@RequestMapping("code")
public void getCode(HttpServletRequest req, HttpServletResponse resp)
throws IOException {
// randomCode用於保存隨機產生的驗證碼,以便用戶登錄後進行驗證。
StringBuffer randomCode = new StringBuffer();
// 定義圖像buffer
BufferedImage buffImg = new BufferedImage(width, height,
BufferedImage.TYPE_INT_RGB);
Graphics gd = buffImg.getGraphics();
// 創建一個隨機數生成器類
Random random = new Random();
// 將圖像填充爲白色
gd.setColor(Color.WHITE);
gd.fillRect(0, 0, width, height);
// 創建字體,字體的大小應該根據圖片的高度來定。
Font font = new Font("Fixedsys", Font.BOLD, fontHeight);
// 設置字體。
gd.setFont(font);
// 畫邊框。
gd.setColor(Color.BLACK);
gd.drawRect(0, 0, width - 1, height - 1);
// 隨機產生40條幹擾線,使圖象中的認證碼不易被其它程序探測到。
gd.setColor(Color.BLACK);
for (int i = 0; i < 10; i++) {
int x = random.nextInt(width);
int y = random.nextInt(height);
int xl = random.nextInt(6);
int yl = random.nextInt(6);
gd.drawLine(x, y, x + xl, y + yl);
}
int red = 0, green = 0, blue = 0;
// 隨機產生codeCount數字的驗證碼。
for (int i = 0; i < codeCount; i++) {
// 得到隨機產生的驗證碼數字。
String code = String.valueOf(codeSequence[random.nextInt(34)]);
// 產生隨機的顏色分量來構造顏色值,這樣輸出的每位數字的顏色值都將不同。
red = random.nextInt(255);
green = random.nextInt(255);
blue = random.nextInt(255);
// 用隨機產生的顏色將驗證碼繪製到圖像中。
gd.setColor(new Color(red, green, blue));
gd.drawString(code, (i + 1) * xx, codeY);
// 將產生的四個隨機數組合在一起。
randomCode.append(code);
}
// 將四位數字的驗證碼保存到Session中。
HttpSession session = req.getSession();
//System.out.println(randomCode.toString());
session.setAttribute("code", randomCode.toString());
// 禁止圖像緩存。
resp.setHeader("Pragma", "no-cache");
resp.setHeader("Cache-Control", "no-cache");
resp.setDateHeader("Expires", 0);
resp.setContentType("image/gif");
// 將圖像輸出到Servlet輸出流中。
ServletOutputStream sos = resp.getOutputStream();
ImageIO.write(buffImg, "gif", sos);
sos.close();
}
@RequestMapping("codeimg")
public String codeimg(){
return "codeimg";
}
@ResponseBody
@RequestMapping("checkCode")
public Map<String,String> checkCode(String code,HttpSession session){
Map<String, String> adminMap = new HashMap<String,String>();
String flag = "0";
//toLowerCase()變小寫
//toUpperCase()變大寫
//(s1).equalsIgnoreCase(s2)忽略大小寫比較
if(code.equalsIgnoreCase(session.getAttribute("code").toString())){
flag="1";
}else if(code.length()==0){
flag="0";
}else{
flag="-1";
}
adminMap.put("admin", flag);
System.out.println("打印這句話說明,Ajax Asynchronous request 發送成功...");
return adminMap;
}
}
web-xml
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="WebApp_ID" version="2.5">
<display-name>jd7</display-name>
<welcome-file-list>
<welcome-file>index.html</welcome-file>
<welcome-file>index.htm</welcome-file>
<welcome-file>index.jsp</welcome-file>
<welcome-file>default.html</welcome-file>
<welcome-file>default.htm</welcome-file>
<welcome-file>default.jsp</welcome-file>
</welcome-file-list>
<!-- mybatis -->
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:spring-mybatis.xml</param-value>
</context-param>
<!-- 監聽 -->
<listener>
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>
<!-- springMVC -->
<servlet>
<servlet-name>spring</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<!-- ====================================== -->
<!-- 可以自定義servlet.xml配置文件的位置和名稱,默認爲WEB-INF目錄下,名稱爲[<servlet-name>]-servlet.xml,如spring-servlet.xml
<init-param>
<param-name>contextConfigLocation</param-name>
<param-value>/WEB-INF/spring-servlet.xml</param-value> 默認
</init-param> -->
<!-- ====================================== -->
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>spring</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>
<!-- 編碼過濾器 -->
<filter>
<filter-name>characterEncodingFilter</filter-name>
<filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
<init-param>
<param-name>encoding</param-name>
<param-value>UTF-8</param-value>
</init-param>
<init-param>
<param-name>forceEncoding</param-name>
<param-value>true</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>characterEncodingFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
</web-app>
spring-servlet.xml
<?xml version="1.0" encoding="UTF-8"?>
<beans
xmlns="http://www.springframework.org/schema/beans"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:mvc="http://www.springframework.org/schema/mvc"
xmlns:p="http://www.springframework.org/schema/p"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation=" http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context.xsd
http://www.springframework.org/schema/mvc
http://www.springframework.org/schema/mvc/spring-mvc.xsd ">
<!-- 啓用spring mvc 註解 -->
<mvc:default-servlet-handler/>
<!-- ****改包名**** --><!-- 設置使用註解的類所在的jar包 -->
<context:component-scan base-package="com.jingdong.controller"/>
<context:component-scan base-package="com.jingdong.service"/>
<context:component-scan base-package="com.jingdong.dao"/>
<mvc:annotation-driven/>
<!-- 對轉向頁面的路徑解析。prefix:前綴, suffix:後綴 -->
<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver"
p:prefix="/WEB-INF/jsp/" p:suffix=".jsp"/>
</beans>