Struts2 生成验证码-蒲公英云

ImageUtil.java
package com.ctl.util;
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.io.IOException;
import java.io.InputStream;
import java.util.HashMap;
import java.util.Map;
import java.util.Random;
import com.sun.image.codec.jpeg.JPEGCodec;
import com.sun.image.codec.jpeg.JPEGImageEncoder;
public final class ImageUtil {
    private static final char[] chars = { '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', 'x', 'y', 'z', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't',
            'u', 'v', 'w' };
    private static final int SIZE = 4;
    private static final int LINES = 6;
    private static final int WIDTH = 100;
    private static final int HEIGHT = 60;
    private static final int FONT_SIZE = 30;
    public static Map<String, BufferedImage> createImage() {
        StringBuffer sb = new StringBuffer();
        BufferedImage image = new BufferedImage(WIDTH, HEIGHT,
                BufferedImage.TYPE_INT_RGB);
        Random ran = new Random();
        Graphics graphic = image.getGraphics();
        graphic.setColor(new Color(55 + ran.nextInt(200),
                55 + ran.nextInt(200), 55 + ran.nextInt(200)));
        graphic.fillRect(0, 0, WIDTH, HEIGHT);
        // 画随机字符
        for (int i = 1; i <= SIZE; i++) {
            int r = ran.nextInt(chars.length);
            graphic.setColor(getRandomColor());
            graphic.setFont(new Font(null, Font.BOLD + Font.ITALIC, FONT_SIZE));
            graphic.drawString(chars[r] + "", (i - 1) * WIDTH / SIZE,
                    HEIGHT / 2);
            sb.append(chars[r]);// 将字符保存，存入Session
        }
        // 画干扰线
        for (int i = 1; i <= LINES; i++) {
            graphic.setColor(getRandomColor());
            graphic.drawLine(ran.nextInt(WIDTH), ran.nextInt(HEIGHT),
                    ran.nextInt(WIDTH), ran.nextInt(HEIGHT));
        }
        Map<String, BufferedImage> map = new HashMap<String, BufferedImage>();
        map.put(sb.toString(), image);
        return map;
    }
    public static Color getRandomColor() {
        Random ran = new Random();
        Color color = new Color(ran.nextInt(256), ran.nextInt(256),
                ran.nextInt(256));
        return color;
    }
    public static InputStream getInputStream(BufferedImage image)
            throws IOException {
        ByteArrayOutputStream bos = new ByteArrayOutputStream();
        JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(bos);
        encoder.encode(image);
        byte[] imageBts = bos.toByteArray();
        InputStream in = new ByteArrayInputStream(imageBts);
        return in;
    }
}
ImageAction.java
package com.ctl.util;
import java.awt.image.BufferedImage; 
import java.io.IOException; 
import java.io.InputStream; 
import java.util.Map; 
import javax.servlet.http.Cookie;
/** 
* 显示验证码的处理 
* @author tarena 
* 
*/ 
public class ImageAction extends BaseAction{ 
    //input 无 
    //output 
    //stream result只能输出inputStream类型的属性值 
    private InputStream imageStream; 
    public String execute() throws IOException{ 
        //生成一个验证码图片 
        Map<String,BufferedImage> map = 
            ImageUtil.createImage(); 
        String code = 
            map.keySet().iterator().next(); 
        BufferedImage image = map.get(code); 
        session.put("code", code);//用于验证 
        System.out.println(code);
        response.addCookie(new Cookie("code", code));
        //把图片给imageStream赋值 
        imageStream = 
            ImageUtil.getInputStream(image); 
        //调用stream result将imageStream输出 
        return "success"; 
    } 
    public InputStream getImageStream() { 
        return imageStream; 
    } 
    public void setImageStream(InputStream imageStream) { 
        this.imageStream = imageStream; 
    } 
}
struts.xml
<struts>
    <constant name="struts.multipart.maxSize" value="1048576000" /><!-- 
        限制上传的最大的字节数 -->
    <!-- 设置struts2 上传文件时 保存的临时目录 -->
    <constant name="struts.multipart.saveDir" value="C:\temp" /><!-- 
        临时目录 -->
    <package name="all" namespace="/" extends="struts-default">
        <!-- 产生验证码 -->
        <action name="image" class="com.ctl.util.ImageAction">
            <result type="stream">
                <param name="inputName">imageStream</param>
            </result>
        </action>
        <action name="upload" class="com.action.FileUploadAction">
            <result name="success">upload.jsp</result>
            <result name="input">upload.jsp</result>
        </action>
    </package>
</struts>    
html页面
<tr>
                            <td class="login-text02">验证码：</td>
                            <td class="width70"><input id="yzm" type="text" name="yzmn"
                                size="10" class="width70" value="" /></td>
                            <td><img src="<%=request.getContextPath()%>/image"
                                style="width:45px;height:21px; margin-left: -130px"
                                id="imageCode" alt="验证码" title="点击更换" /></td>
                        </tr>
    // 变换验证码
    $('#imageCode').click(function() {
        $('#imageCode').attr('src', "image?ts="+Math.random());
    });
function getCookie(c_name)
{
    if (document.cookie.length>0)
    { 
        c_start=document.cookie.indexOf(c_name + "=")
        if (c_start!=-1)
        { 
            c_start=c_start + c_name.length+1 
            c_end=document.cookie.indexOf(";",c_start)
            if (c_end==-1) c_end=document.cookie.length
            return unescape(document.cookie.substring(c_start,c_end))
        } 
    }
    return ""
}
function checkLogin() {
    var yzmv = document.frm.yzmn.value;
                if (yzmv == "") {
            alert("验证码不能为空");
            document.frm.yzmn.focus();
            return false;
        }
        var value=getCookie('code');
        //alert(value);
        if(yzmv!=value){
            alert("验证码错误");
            document.frm.yzmn.focus();
            return false;
        }
    }