Struts2 生成验证码

左手的ㄟ右手 2022-08-26 14:27 195阅读 0赞

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" />
    
    	
    	<constant name="struts.multipart.saveDir" value="C:\temp" />
    	<package name="all" namespace="/" extends="struts-default">
    
    		
    		<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;
    		}
    	}