package com.tenghu.code,

  。

import java.awt.Color; import java.awt.Font; import java.awt.Graphics2D; import java.awt.image.BufferedImage; import java.io.FileNotFoundException; import java.io.FileOutputStream; import java.io.IOException; import java.io.OutputStream; import java.util.Random; import javax.imageio.ImageIO,

/**  * 验证码生成类  * @author xiaohu  *  */ public class RandomImageGenerator {  //创建Random对象  static Random random=new Random();  //随机生成包含验证码字符串  public static String random(int num){   //初始化种子   String[] str={"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"};   int number=str.length;   //接收随机字符   String text = "";   //随机产生4个字符的字符串   for(int i=0;i<num;i++){    text+=str[random.nextInt(number)];   }   return text;  }  /**   * 随机产生定义的颜色   *    * @return   */  private static Color getRandColor() {   Random random = new Random();   Color color[] = new Color[10];   color[0] = new Color(32, 158, 25);   color[1] = new Color(218, 42, 19);   color[2] = new Color(31, 75, 208);   color[3] = new Color(0, 102, 182);   color[4] = new Color(171, 0, 85);   return color[random.nextInt(5)];  }  /**   * 产生随机字体   *    * @return   */  private static Font getFont() {   Random random = new Random();   Font font[] = new Font[5];   font[0] = new Font("Ravie", Font.BOLD, 30);   font[1] = new Font("Antique Olive Compact", Font.BOLD, 30);   font[2] = new Font("Forte", Font.BOLD, 30);   font[3] = new Font("Wide Latin", Font.BOLD, 30);   font[4] = new Font("Gill Sans Ultra Bold", Font.BOLD, 30);   return font[random.nextInt(5)];  }  /**   * 生成图片   * @throws IOException    */  public static void render(String randomStr,OutputStream out,int width,int height) throws IOException{   //在内存中创建图像   BufferedImage bi=new BufferedImage(width, height, BufferedImage.TYPE_BYTE_INDEXED);   //获取图形上下文   Graphics2D g=(Graphics2D) bi.getGraphics();   //话边框   g.setColor(Color.white);   g.fillRect(0, 0, width, height);   g.setFont(getFont());   g.setColor(Color.BLACK);   //画认证码，每个认证码在不同的水平位置   String str1[]=new String[randomStr.length()];   for(int i=0;i<str1.length;i++){    str1[i]=randomStr.substring(i,i+1);    int w=0;    int x=(i+1)%3;    //随机生成验证码字符水平偏移量    if(x==random.nextInt(7)){     w=30-random.nextInt(7);    }else{     w=30+random.nextInt(7);    }    //随机生成颜色    g.setColor(getRandColor());    g.drawString(str1[i], 20*i+10, w);   }   //随机产生干扰点，并用不同的颜色表示，事图像的认证码不易被其他程序探测到   for(int i=0;i<100;i++){    int x=random.nextInt(width);    int y=random.nextInt(height);    Color color=new Color(random.nextInt(255), random.nextInt(255), random.nextInt(255));    //随机画各种颜色的线    g.setColor(color);    g.drawOval(x, y, 0, 0);   }   //画干扰线   for(int i=0;i<15;i++){    int x=random.nextInt(width);    int y=random.nextInt(height);    int x1=random.nextInt(width);    int y1=random.nextInt(height);    Color color=new Color(random.nextInt(255), random.nextInt(255), random.nextInt(255));    //随机画各种颜色线    g.setColor(color);    g.drawLine(x, y, x1, y1);   }   //图像生效   g.dispose();   //输出页面   ImageIO.write(bi, "jpg", out);  }  public static void main(String[] args) throws FileNotFoundException, IOException {   //获取随机字符串   String randomStr=random(5);   System.out.println(randomStr);   //生成图片   render(randomStr, new FileOutputStream("D:\\test.jpg"),130,40);  } } 。

package com.tenghu.code.servlet,

  。

import java.io.IOException; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import javax.servlet.http.HttpSession,

import com.tenghu.code.RandomImageGenerator,

public class RandomImageServlet extends HttpServlet {  //图片宽度  int width=0;  //图片高度  int height=0;  //图片上随机字符个数  int randomStrNum=0;  public void destroy() {  }  public void doGet(HttpServletRequest request, HttpServletResponse response)    throws ServletException, IOException {   doPost(request, response);  }  public void doPost(HttpServletRequest request, HttpServletResponse response)    throws ServletException, IOException {   request.setCharacterEncoding("UTF-8");   //获取HttpSession对象   HttpSession session=request.getSession();   //获取随机字符串   String randomStr=RandomImageGenerator.random(randomStrNum);   if(null!=session){    //设置参数    session.setAttribute("randomStr", randomStr);    //设置响应类型,输出图片客户端不缓存    response.setDateHeader("Expires", 1L);      response.setHeader("Cache-Control", "no-cache, no-store, max-age=0");    response.addHeader("Pragma", "no-cache");    response.setContentType("image/jpeg");     //输出到页面    RandomImageGenerator.render(randomStr, response.getOutputStream(), width, height);   }  }  public void init() throws ServletException {   //获取宽度   width=Integer.parseInt(this.getInitParameter("width"));   //获取高度   height=Integer.parseInt(this.getInitParameter("height"));   //获取个数   randomStrNum=Integer.parseInt(this.getInitParameter("num"));  } }    。

package com.tenghu.code.action,

  。

import java.io.ByteArrayInputStream; import java.io.InputStream; import com.opensymphony.xwork2.ActionContext; import com.opensymphony.xwork2.ActionSupport,

public class LoginAction extends ActionSupport{  //用户名  private String userName;  //密码  private String password;  //验证码  private String code;  private InputStream inputStream;  public InputStream getResult(){   return inputStream;  }  //成功  public String success() throws Exception{   return SUCCESS;  }  //测试登录  public String testLogin() throws Exception{   //获取图片的验证码   String randomStr=(String) ActionContext.getContext().getSession().get("randomStr");   if(code.trim().equalsIgnoreCase(randomStr)){    if("admin".equals(userName.trim())&&"admin".equals(password.trim())){     //成功     inputStream=new ByteArrayInputStream("1".getBytes("UTF-8"));    }else{     //用户名或密码错误     inputStream=new ByteArrayInputStream("2".getBytes("UTF-8"));    }   }else{    //验证码错误    inputStream=new ByteArrayInputStream("0".getBytes("UTF-8"));   }   return "result";  }  public String getUserName() {   return userName;  }  public void setUserName(String userName) {   this.userName = userName;  }  public String getPassword() {   return password;  }  public void setPassword(String password) {   this.password = password;  }  public String getCode() {   return code;  }  public void setCode(String code) {   this.code = code;  } } 。

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE struts PUBLIC
 "-//Apache Software Foundation//DTD Struts Configuration 2.3//EN"
 "http://struts.apache.org/dtds/struts-2.3.dtd">
<struts> 
 <package name="installs" extends="struts-default">
  <action name="login" class="com.tenghu.code.action.LoginAction">
   <!-- 登录成功到success.jsp页面 -->
   <result name="success">success.jsp</result>
   <!-- 登录验证返回的数据 -->
   <result name="result" type="stream">
    <param name="contentType">text/html</param>
    <param name="inputName">result</param>
   </result>
  </action>
 </package>
</struts>

<?xml version="1.0" encoding="UTF-8"?> <web-app version="2.5"   xmlns="http://java.sun.com/xml/ns/javaee"   xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"   xsi:schemaLocation="http://java.sun.com/xml/ns/javaee   http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">   <servlet>     <description>This is the description of my J2EE component</description>     <display-name>This is the display name of my J2EE component</display-name>     <servlet-name>RandomImageServlet</servlet-name>     <servlet-class>com.tenghu.code.servlet.RandomImageServlet</servlet-class>     <!-- 初始化图片宽度 -->     <init-param>      <param-name>width</param-name>      <param-value>130</param-value>     </init-param>     <!-- 初始化图片高度 -->     <init-param>      <param-name>height</param-name>      <param-value>40</param-value>     </init-param>     <!-- 初始化图片随机数个数 -->     <init-param>      <param-name>num</param-name>      <param-value>4</param-value>     </init-param>   </servlet> 。

  。

  <servlet-mapping>     <servlet-name>RandomImageServlet</servlet-name>     <url-pattern>/verification.do</url-pattern>   </servlet-mapping>   <!-- 配置struts核心过滤器 -->   <filter>    <filter-name>struts2</filter-name>    <filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class>   </filter>   <filter-mapping>    <filter-name>struts2</filter-name>    <url-pattern>/*</url-pattern>   </filter-mapping>   <welcome-file-list>     <welcome-file>index.jsp</welcome-file>   </welcome-file-list> </web-app> 。

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <base href="<%=basePath%>">

    <title>My JSP 'index.jsp' starting page</title>
 <script type="text/javascript" src="js/jquery-1.10.2.min.js"></script>
 <script type="text/javascript" src="js/jquery.form.js"></script>
 <script type="text/javascript">
  $(document).ready(function(){
   CODE.initCode();
   //验证输入
   function checkInput(){
    if($('#userName').val()==''){
     alert('用户名不能为空！');
     return false;
    }
    if($('#password').val()==''){
     alert('密码不能为空！');
     return false;
    }
    if($('#code').val()==''){
     alert('验证码不能为空！');
     return false;
    }
    return true;
   }

   //点击按钮
   $('#btn').click(function(){
    if(checkInput()==true){
     $('#login_request').ajaxSubmit({
      url:'login!testLogin',
      cache:false,
      type:'POST',
      success:function(data){
       if(data==0){
        alert('验证码错误！');
        //改变验证码
        CODE.initCode();
       }else if(data==1){
        alert('登录成功！');
        //提交到登录成功页面
        $('#login_request')[0].submit();
       }else if(data==2){
        alert('用户名或密码错误！');
        //改变验证码
        CODE.initCode();
       }
      },
      error:function(e){
       alert('出错了！');
      }
     });
     }
   });
  });
  var CODE={
    //初始化化验证码
    initCode:function(){
     $("#code_img").attr("src","verification.do?rmd="+new Date().getTime())//如果需要点击图片改变图片的内容，则必须添加时间搓
     .click(function(){
      $(this).attr("src","verification.do?rmd="+new Date().getTime());
     }); 
    }};
 </script>
  </head>

  <body>
   <form action="login!success" id="login_request" method="post">
    UserName:<input type="text" id="userName" name="userName"/><br/>
    Password:<input type="password" id="password" name="password"/><br>
    Verification_Code:<input type="text" id="code" name="code"/><img id="code_img" style="position:relative;top:8px;height:25px"><br>
    <input type="button" id="btn" value="登录"/>
   </form>
  </body>
</html>