Java Struts2 生成动态图片验证码Demo


上一篇分享了Servlet方式的图片验证码,这次是分享一下图片验证码在Struts2下的实现。

Index.jsp运行效果:

java struts2 action 图片验证码

  • 自定义验证码图片大小
  • 自定义随机字符
  • 自定义前景色和背景色
  • 自定义干扰点
  • 自定义验证码三个难度级别

SecurityCode.java
[java]
package net.singlex.common;

import java.util.Arrays;

/**
* 工具类,生成随机验证码字符串
*
* @author SingleX SingleXer@gmail.com
* @version 1.0 2013-8-26 上午10:00:15
*/
public class SecurityCode {

/**
* 验证码难度级别 Simple-数字 Medium-数字和小写字母 Hard-数字和大小写字母
*/
public enum SecurityCodeLevel {
Simple, Medium, Hard
};

/**
* 产生默认验证码,4位中等难度
*
* @return
*/
public static String getSecurityCode() {
return getSecurityCode(4, SecurityCodeLevel.Medium, false);
}

/**
* 产生长度和难度任意的验证码
*
* @param length
* @param level
* @param isCanRepeat
* @return
*/
public static String getSecurityCode(int length, SecurityCodeLevel level, boolean isCanRepeat) {
// 随机抽取len个字符
int len = length;
// 字符集合(–除去易混淆的数字0,1,字母l,o,O)
char[] codes = {
‘0’, ‘1’, ‘2’, ‘3’, ‘4’, ‘5’, ‘6’, ‘7’, ‘8’, ‘9’,
‘a’, ‘b’, ‘c’, ‘d’, ‘e’, ‘f’, ‘g’, ‘h’, ‘i’, ‘j’, ‘k’, ‘l’, ‘m’, ‘n’, ‘o’, ‘p’, ‘q’, ‘r’, ‘s’, ‘t’, ‘u’, ‘v’, ‘w’, ‘x’, ‘y’, ‘z’,
‘A’, ‘B’, ‘C’, ‘D’, ‘E’, ‘F’, ‘G’, ‘H’, ‘I’, ‘J’, ‘K’, ‘L’, ‘M’, ‘N’, ‘O’, ‘P’, ‘Q’, ‘R’, ‘S’, ‘T’, ‘U’, ‘V’, ‘W’, ‘X’, ‘Y’, ‘Z’
};
// 根据不同难度截取字符串
if (level == SecurityCodeLevel.Simple) {
codes = Arrays.copyOfRange(codes, 0, 10);
} else if (level == SecurityCodeLevel.Medium) {
codes = Arrays.copyOfRange(codes, 0, 36);
}
// 字符集和长度
int n = codes.length;
// 抛出运行时异常
if (len > n && isCanRepeat == false) {
throw new RuntimeException(String.format("调用SecurityCode.getSecurityCode(%1$s,%2$s,%3$s)出现异常," + "当isCanRepeat为%3$s时,传入参数%1$s不能大于%4$s", len, level, isCanRepeat, n));
}
// 存放抽取出来的字符
char[] result = new char[len];
// 判断能否出现重复字符
if (isCanRepeat) {
for (int i = 0; i < result.length; i++) {
// 索引0 and n-1
int r = (int) (Math.random() * n);
// 将result中的第i个元素设置为code[r]存放的数值
result[i] = codes[r];
}
} else {
for (int i = 0; i < result.length; i++) {
// 索引0 and n-1
int r = (int) (Math.random() * n);
// 将result中的第i个元素设置为code[r]存放的数值
result[i] = codes[r];
// 必须确保不会再次抽取到那个字符,这里用数组中最后一个字符改写code[r],并将n-1
codes[r] = codes[n – 1];
n–;
}
}
return String.valueOf(result);
}
}
[/java]

SecurityImage.java:
[java]
package net.singlex.common;

import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.image.BufferedImage;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.util.Random;

import com.sun.image.codec.jpeg.JPEGCodec;
import com.sun.image.codec.jpeg.JPEGImageEncoder;

/**
* 工具类,生成验证码图片
* @author SingleX SingleXer@Gmail.com
* @version 1.0 2013-8-27 上午09:01:16
*/
public class SecurityImage {

/**
* 生成验证码图片
* @param securityCode
* @return
*/
public static BufferedImage createImage(String securityCode){

int codeLength = securityCode.length();//验证码长度
int fontSize = 15;//字体大小
int fontWidth = fontSize+1;

//图片宽高
int width = codeLength*fontWidth+6;
int height = fontSize*2+1;
//图片
BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
Graphics g = image.createGraphics();
g.setColor(Color.WHITE);//设置背景色
g.fillRect(0, 0, width, height);//填充背景
g.setColor(Color.LIGHT_GRAY);//设置边框颜色
g.setFont(new Font("Arial", Font.BOLD, height-2));//边框字体样式
g.drawRect(0, 0, width-1, height-1);//绘制边框

//绘制噪点
Random rand = new Random();
g.setColor(Color.LIGHT_GRAY);
for (int i = 0; i < codeLength*6; i++) {
int x = rand.nextInt(width);
int y = rand.nextInt(height);
g.drawRect(x, y, 1, 1);//绘制1*1大小的矩形
}
//绘制验证码
int codeY = height-10;
g.setColor(new Color(19,148,246));
g.setFont(new Font("Georgia", Font.BOLD, fontSize));
for(int i=0;i<codeLength;i++){
g.drawString(String.valueOf(securityCode.charAt(i)), i*16+5, codeY);
}
g.dispose();//关闭资源
return image;
}

/**
* 返回验证码图片的流格式
* @param securityCode
* @return
*/
public static ByteArrayInputStream getImageAsInputStream(String securityCode){
BufferedImage image = createImage(securityCode);
return convertImageToStream(image);
}

/**
* 将BufferedImage转换成ByteArrayinputStream
* @param image
* @return
*/
public static ByteArrayInputStream convertImageToStream(BufferedImage image){
ByteArrayInputStream inputStream = null;
ByteArrayOutputStream outStream = new ByteArrayOutputStream();
JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(outStream);
try {
encoder.encode(image);
byte[] b = outStream.toByteArray();
inputStream = new ByteArrayInputStream(b);
} catch (Exception e) {

}
return inputStream;
}
}
[/java]

LoginAction.java:
[java]
package net.singlex.web;

import java.util.Map;

import org.apache.struts2.interceptor.SessionAware;

import com.opensymphony.xwork2.ActionSupport;

@SuppressWarnings("serial")
public class LoginAction extends ActionSupport implements SessionAware {

private Map<String, Object> session;
private String securityCode;

private String name;
private String password;

public String login() throws Exception {
String serverCode = (String) session.get("SESSION_SECURITY_CODE");
if(!serverCode.equalsIgnoreCase(securityCode))
return ERROR;
//验证账户密码。。。
System.out.println("login success");
return SUCCESS;
}

public void setSession(Map<String, Object> session) {
this.session = session;
}

public String getSecurityCode() {
return securityCode;
}

public void setSecurityCode(String securityCode) {
this.securityCode = securityCode;
}

public void setName(String name) {
this.name = name;
}

public String getName() {
return name;
}

public void setPassword(String password) {
this.password = password;
}

public String getPassword() {
return password;
}

}
[/java]

SecurityCodeImageAction.java:
[java]
package net.singlex.web;

import java.io.ByteArrayInputStream;
import java.util.Map;

import net.singlex.common.SecurityCode;
import net.singlex.common.SecurityImage;
import net.singlex.common.SecurityCode.SecurityCodeLevel;

import org.apache.struts2.interceptor.SessionAware;

import com.opensymphony.xwork2.ActionSupport;

@SuppressWarnings("serial")
public class SecurityCodeImageAction extends ActionSupport implements
SessionAware {

private Map<String, Object> session;
private ByteArrayInputStream imageStream;

@Override
public String execute() throws Exception {

//如果开启Hard模式,可不区分大小写
String securityCode = SecurityCode.getSecurityCode(6, SecurityCodeLevel.Hard, false);
//获取默认难度和长度的验证码
// String securityCode = SecurityCode.getSecurityCode();
imageStream = SecurityImage.getImageAsInputStream(securityCode);
//放入session
session.put("SESSION_SECURITY_CODE", securityCode);
return SUCCESS;
}

public void setSession(Map<String, Object> session) {
this.session = session;
}

public void setImageStream(ByteArrayInputStream imageStream) {
this.imageStream = imageStream;
}

public ByteArrayInputStream getImageStream() {
return imageStream;
}

}
[/java]

struts.xml
[xml]
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.1//EN" "http://struts.apache.org/dtds/struts-2.1.dtd">
<struts>
<package name="Security" namespace="/Security" extends="struts-default">
<action name="SecurityCodeImageAction" class="net.singlex.web.SecurityCodeImageAction">
<result name="success" type="stream">
<param name="contentType">image/jpeg</param>
<param name="inputName">imageStream</param>
<param name="bufferSize">2048</param>
</result>
</action>
<action name="*_LoginAction" class="net.singlex.web.LoginAction" method="{1}">
<result name="success">/index.jsp</result>
</action>
</package>
</struts>
[/xml]

index.jsp
[java]
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">

<title>My JSP ‘index.jsp’ starting page</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
<!–
<link rel="stylesheet" type="text/css" href="styles.css">
–>
<script type="text/javascript">
function changeImg(){
document.getElementById("changeImg").disabled=true;
document.getElementById("verify").src="Security/SecurityCodeImageAction?timestamp=" + new Date().getTime();
}
</script>
</head>

<body>
<form action="Security/login_LoginAction" method="get">
<table>
<tr><td colspan="4" align="center">后台登陆</td></tr>
<tr>
<td>账号</td><td colspan="3"><input type="text" name="name" /></td>
</tr>
<tr>
<td>密码</td><td colspan="3"><input type="password" name="password" /></td>
</tr>
<tr>
<td>验证码</td>
<td><input type="text" name="securityCode" /></td>
</tr>
<tr>
<td><img src="Security/SecurityCodeImageAction" id="verify" style="cursor:hand;" alt="看不清,换一张" /></td>
<td><a href="javascript:onclick=changeImg()" id="changeImg">看不清,换一张</a></td>
</tr>
<tr>
<td><input type="submit" value="Submit" /></td>
</tr>
</table>
</form>
</body>
</html>
[/java]

ProjectDemo:百度网盘下载

3 Responses Comment (3) Trackback (0)
  1. 飞行的鱼 :

    @Action(value = “getSecurityCode”, results = { @Result(name=”success”,type=”stream”,params = {“contentType”,”image/jpeg”,”inputName”,”imageStream”,”bufferSize”,”2048″}) })
    使用注解方式可以这样写 ,作者没有写哪些关键,像JPEGImageEncoder 这几个类在rt.jar包中但是myeclipse会禁止使用,要么改设置要么去目录下拷出来放到项目中.还有就是params中的 inputName 这个是type=stream的默认属性名.必须是这个名 ,而且给它的对象必须是stream类型

  2. zzz :

    为什么我按照你写的这种方式在页面显示不出来呢

    1. SingleX Post author :

      我这个都是自己测试过的,实在不知道怎么回事就下载我百度网盘分享的Demo试试吧

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