struts2 生成6位验证码

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文件结构：

RandomPictureAction.java

package org.apache.struts.action;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 javax.imageio.ImageIO;import javax.imageio.stream.ImageOutputStream;import com.opensymphony.xwork2.ActionContext;import com.opensymphony.xwork2.ActionSupport;public class RandomPictureAction extends ActionSupport {/** *  */private static final long serialVersionUID = -6950908478971552308L;private ByteArrayInputStream inputStream;public String execute() throws Exception {// 在内存中创建图象int width = 85, height = 20;BufferedImage image = new BufferedImage(width, height,BufferedImage.TYPE_INT_RGB);// 获取图形上下文Graphics g = image.getGraphics();// 生成随机类Random random = new Random();// 设定背景色g.setColor(getRandColor(200, 250));g.fillRect(0, 0, width, height);// 设定字体g.setFont(new Font("Times New Roman", Font.PLAIN, 18));// 随机产生155条干扰线，使图象中的认证码不易被其它程序探测到g.setColor(getRandColor(160, 200));for (int i = 0; i < 155; i++) {int x = random.nextInt(width);int y = random.nextInt(height);int xl = random.nextInt(12);int yl = random.nextInt(12);g.drawLine(x, y, x + xl, y + yl);}// 取随机产生的认证码(6位数字)String sRand = "";for (int i = 0; i < 6; i++) {String rand = String.valueOf(random.nextInt(10));sRand += rand;// 将认证码显示到图象中g.setColor(new Color(20 + random.nextInt(110), 20 + random.nextInt(110), 20 + random.nextInt(110)));// 调用函数出来的颜色相同，可能是因为种子太接近，所以只能直接生成g.drawString(rand, 13 * i + 6, 16);}System.out.println("srand:"+sRand);// 将认证码存入SESSIONActionContext.getContext().getSession().put("rand", sRand);// 图象生效g.dispose();ByteArrayOutputStream output = new ByteArrayOutputStream();ImageOutputStream imageOut = ImageIO.createImageOutputStream(output);ImageIO.write(image, "JPEG", imageOut);imageOut.close();ByteArrayInputStream input = new ByteArrayInputStream(output.toByteArray());this.setInputStream(input);return SUCCESS;}/* * 给定范围获得随机颜色 */private Color getRandColor(int fc, int bc) {Random random = new Random();if (fc > 255)fc = 255;if (bc > 255)bc = 255;int r = fc + random.nextInt(bc - fc);int g = fc + random.nextInt(bc - fc);int b = fc + random.nextInt(bc - fc);return new Color(r, g, b);}public void setInputStream(ByteArrayInputStream inputStream) {this.inputStream = inputStream;}public ByteArrayInputStream getInputStream() {return inputStream;}}

struts.xml

<?xml version="1.0" encoding="UTF-8"?><!DOCTYPE struts PUBLIC    "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"    "http://struts.apache.org/dtds/struts-2.0.dtd"><struts><constant name="struts.devMode" value="true" /><package name="randpicture" extends="struts-default"><action name="rand" class="org.apache.struts.action.RandomPictureAction"><result type="stream"><param name="contentType">image/jpeg</param><param name="inputName">inputStream</param></result></action></package></struts>

index.jsp

<?xml version="1.0" encoding="ISO-8859-1" ?><%@ taglib prefix="s" uri="/struts-tags"%><%@ page language="java" contentType="text/html; charset=ISO-8859-1"pageEncoding="ISO-8859-1"%><!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><s:head /><meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1" /><title>Random Picture</title></head><body><script type="text/javascript">    function changeValidateCode(obj) {        var currentTime= new Date().getTime();        obj.src = "rand.action?d=" + currentTime;    }</script><img src="rand.action" onclick="changeValidateCode(this)" /></body></html>

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>yzm</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>  <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></web-app>

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