자바 구현 인증 코드 구체 적 인 코드
자바 인증 코드 구현 절차:
1.RandomImageGenerator.자바 류 를 만 들 고 인증 코드 이미지 의 생 성 을 실현 합 니 다.
2.servlet 클래스,RandomImageServlet.java 를 만 들 고 생 성 된 인증 코드 를 페이지 에 출력 합 니 다.
3.Action 클래스,LoginAction.java 를 만 들 고 로그 인 을 제어 합 니 다.
4.struts.xml 웹.xml 파일 설정
5.페이지 작성
구체 적 실현 용 코드 표현
1.RandomImageGenerator.java 클래스 만 들 기
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;
/**
*
* @author xiaohu
*
*/
public class RandomImageGenerator {
// Random
static Random random=new Random();
//
public static String random(int num){
//
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;
//
String text = "";
// 4
for(int i=0;i<num;i++){
text+=str[random.nextInt(number)];
}
return text;
}
/**
*
*
* @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)];
}
/**
*
*
* @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)];
}
/**
*
* @throws IOException
*/
public static void render(String randomStr,OutputStream out,int width,int height) throws IOException{
//
BufferedImage bi=new BufferedImage(width, height, BufferedImage.TYPE_BYTE_INDEXED);
//
Graphics2D g=(Graphics2D) bi.getGraphics();
//
g.setColor(Color.white);
g.fillRect(0, 0, width, height);
g.setFont(getFont());
g.setColor(Color.BLACK);
// ，
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;
//
if(x==random.nextInt(7)){
w=30-random.nextInt(7);
}else{
w=30+random.nextInt(7);
}
//
g.setColor(getRandColor());
g.drawString(str1[i], 20*i+10, w);
}
// ， ，
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));
//
g.setColor(color);
g.drawOval(x, y, 0, 0);
}
//
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));
//
g.setColor(color);
g.drawLine(x, y, x1, y1);
}
//
g.dispose();
//
ImageIO.write(bi, "jpg", out);
}
public static void main(String[] args) throws FileNotFoundException, IOException {
//
String randomStr=random(5);
System.out.println(randomStr);
//
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 {
//
int width=0;
//
int height=0;
//
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");
// HttpSession
HttpSession session=request.getSession();
//
String randomStr=RandomImageGenerator.random(randomStrNum);
if(null!=session){
//
session.setAttribute("randomStr", randomStr);
// ,
response.setDateHeader("Expires", 1L);
response.setHeader("Cache-Control", "no-cache, no-store, max-age=0");
response.addHeader("Pragma", "no-cache");
response.setContentType("image/jpeg");
//
RandomImageGenerator.render(randomStr, response.getOutputStream(), width, height);
}
}
public void init() throws ServletException {
//
width=Integer.parseInt(this.getInitParameter("width"));
//
height=Integer.parseInt(this.getInitParameter("height"));
//
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{
//
private String userName;
//
private String password;
//
private String code;
private InputStream inputStream;
public InputStream getResult(){
return inputStream;
}
//
public String success() throws Exception{
return SUCCESS;
}
//
public String testLogin() throws Exception{
//
String randomStr=(String) ActionContext.getContext().getSession().get("randomStr");
if(code.trim().equalsIgnoreCase(randomStr)){
if("admin".equals(userName.trim())&&"admin".equals(password.trim())){
//
inputStream=new ByteArrayInputStream("1".getBytes("UTF-8"));
}else{
//
inputStream=new ByteArrayInputStream("2".getBytes("UTF-8"));
}
}else{
//
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">
<!-- success.jsp -->
<result name="success">success.jsp</result>
<!-- -->
<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>
<!-- -->
<init-param>
<param-name>width</param-name>
<param-value>130</param-value>
</init-param>
<!-- -->
<init-param>
<param-name>height</param-name>
<param-value>40</param-value>
</init-param>
<!-- -->
<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>
<!-- struts -->
<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">
$(document).ready(function(){
CODE.initCode();
//
function checkInput(){
if($('#userName').val()==''){
alert(' ！');
return false;
}
if($('#password').val()==''){
alert(' ！');
return false;
}
if($('#code').val()==''){
alert(' ！');
return false;
}
return true;
}
//
$('#btn').click(function(){
if(checkInput()==true){
$('#login_request').ajaxSubmit({
url:'login!testLogin',
cache:false,
type:'POST',
success:function(data){
if(data==0){
alert(' ！');
//
CODE.initCode();
}else if(data==1){
alert(' ！');
//
$('#login_request')[0].submit();
}else if(data==2){
alert(' ！');
//
CODE.initCode();
}
},
error:function(e){
alert(' ！');
}
});
}
});
});
var CODE={
//
initCode:function(){
$("#code_img").attr("src","verification.do?rmd="+new Date().getTime())// ，
.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=" "/>
</form>
</body>
</html>
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