1、login.jsp页面程序
- <script type&#61;"text/Javascript">
- function changeValidateCode(obj) {
- //获取当前的时间作为参数&#xff0c;无具体意义
- var timenow &#61; new Date().getTime();
- //每次请求需要一个不同的参数&#xff0c;否则可能会返回同样的验证码
- //这和浏览器的缓存机制有关系&#xff0c;也可以把页面设置为不缓存&#xff0c;这样就不用这个参数了。
- obj.src&#61;"rand.action?d&#61;"&#43;timenow;
- }
- script>
- 在表单中添加下面这句话&#xff1a;
- <s:text name&#61;"random">s:text>&#xff1a;<s:textfield name&#61;"rand" size&#61;"5">s:textfield><img src&#61;"rand.action" onclick&#61;"changeValidateCode(this)" title&#61;"点击图片刷新验证码"/>
2、RandomNumUtil.java 生成验证码的类文件
- package org.ml.util;
- import java.awt.Color;
- import java.awt.Font;
- import java.awt.Graphics;
- import java.awt.p_w_picpath.BufferedImage;
- import java.io.ByteArrayInputStream;
- import java.io.ByteArrayOutputStream;
- import java.util.Random;
- import javax.p_w_picpathio.ImageIO;
- import javax.p_w_picpathio.stream.ImageOutputStream;
- public class RandomNumUtil {
- public static final char[] CHARS &#61; { &#39;2&#39;, &#39;3&#39;, &#39;4&#39;, &#39;5&#39;, &#39;6&#39;, &#39;7&#39;, &#39;8&#39;,
- &#39;9&#39;, &#39;A&#39;, &#39;B&#39;, &#39;C&#39;, &#39;D&#39;, &#39;E&#39;, &#39;F&#39;, &#39;G&#39;, &#39;H&#39;, &#39;J&#39;, &#39;K&#39;, &#39;L&#39;, &#39;M&#39;,
- &#39;N&#39;, &#39;P&#39;, &#39;Q&#39;, &#39;R&#39;, &#39;S&#39;, &#39;T&#39;, &#39;U&#39;, &#39;V&#39;, &#39;W&#39;, &#39;X&#39;, &#39;Y&#39;, &#39;Z&#39; };
- private ByteArrayInputStream p_w_picpath;// 图像
- private String str;// 验证码
- private RandomNumUtil() {
- init();// 初始化属性
- }
- /*
- * 取得RandomNumUtil实例
- */
- public static RandomNumUtil Instance() {
- return new RandomNumUtil();
- }
- /*
- * 取得验证码图片
- */
- public ByteArrayInputStream getImage() {
- return this.p_w_picpath;
- }
- /*
- * 取得图片的验证码
- */
- public String getString() {
- return this.str;
- }
- private void init() {
- // 在内存中创建图象
- int width &#61; 85, height &#61; 20;
- BufferedImage p_w_picpath &#61; new BufferedImage(width, height,
- BufferedImage.TYPE_INT_RGB);
- // 获取图形上下文
- Graphics g &#61; p_w_picpath.getGraphics();
- // 生成随机类
- Random random &#61; 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&#xff0c;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 &#61; 0; i < 155; i&#43;&#43;) {
- int x &#61; random.nextInt(width);
- int y &#61; random.nextInt(height);
- int xl &#61; random.nextInt(12);
- int yl &#61; random.nextInt(12);
- g.drawLine(x, y, x &#43; xl, y &#43; yl);
- }
- // 取随机产生的认证码(6位数字)
- StringBuffer sRand &#61; new StringBuffer();
- for (int i &#61; 0; i < 6; i&#43;&#43;) {
- String rand &#61; String.valueOf(CHARS[random.nextInt(CHARS.length)]);
- sRand.append(rand);
- // 将认证码显示到图象中
- g.setColor(new Color(20 &#43; random.nextInt(110), 20 &#43; random
- .nextInt(110), 20 &#43; random.nextInt(110)));
- // 调用函数出来的颜色相同&#xff0c;可能是因为种子太接近&#xff0c;所以只能直接生成
- g.drawString(rand, 13 * i &#43; 6, 16);
- }
- // 赋值验证码
- this.str &#61; sRand.toString();
- // 图象生效
- g.dispose();
- ByteArrayInputStream input &#61; null;
- ByteArrayOutputStream output &#61; new ByteArrayOutputStream();
- try {
- ImageOutputStream p_w_picpathOut &#61; ImageIO
- .createImageOutputStream(output);
- ImageIO.write(p_w_picpath, "JPEG", p_w_picpathOut);
- p_w_picpathOut.close();
- input &#61; new ByteArrayInputStream(output.toByteArray());
- } catch (Exception e) {
- System.out.println("验证码图片产生出现错误&#xff1a;" &#43; e.toString());
- }
- this.p_w_picpath &#61; input;/* 赋值图像 */
- }
- /*
- * 给定范围获得随机颜色
- */
- private Color getRandColor(int fc, int bc) {
- Random random &#61; new Random();
- if (fc > 255)
- fc &#61; 255;
- if (bc > 255)
- bc &#61; 255;
- int r &#61; fc &#43; random.nextInt(bc - fc);
- int g &#61; fc &#43; random.nextInt(bc - fc);
- int b &#61; fc &#43; random.nextInt(bc - fc);
- return new Color(r, g, b);
- }
- }
3、RandomAction.java 生成验证码的action程序
- import java.io.ByteArrayInputStream;
- import org.ml.util.RandomNumUtil;
- import com.opensymphony.xwork2.ActionContext;
- import com.opensymphony.xwork2.ActionSupport;
- public class RandomAction extends ActionSupport{
- private ByteArrayInputStream inputStream;
- public String execute() throws Exception{
- RandomNumUtil rdnu&#61;RandomNumUtil.Instance();
- this.setInputStream(rdnu.getImage());//取得带有随机字符串的图片
- ActionContext.getContext().getSession().put("random", rdnu.getString());//取得随机字符串放入HttpSession
- return SUCCESS;
- }
- public void setInputStream(ByteArrayInputStream inputStream) {
- this.inputStream &#61; inputStream;
- }
- public ByteArrayInputStream getInputStream() {
- return inputStream;
- }
- }
4、LoginAction.java 验证验证码的action
- private String rand; //表单中的rand
- public String getRand() {
- return rand;
- }
- public void setRand(String rand) {
- this.rand &#61; rand;
- }
- //从session中取出RandomAction.java 中生成的验证码random
- String arandom&#61;(String)(ActionContext.getContext().getSession().get("random"));
- //下面就是将session中保存验证码字符串与客户输入的验证码字符串对比了
- if(arandom.equals(this.getRand())) {
- ActionContext.getContext().getSession().put("user", this.getUsername());
- return SUCCESS;
- }
- else {
- return ERROR;
- }
5、配置struts.xml文件
- <action name&#61;"rand" class&#61;"org.ml.rand.RandomAction">
- <result type&#61;"stream">
- <param name&#61;"contentType">p_w_picpath/jpegparam>
- <param name&#61;"inputName">inputStreamparam>
- result>
- action>
演示效果