struts2与springmvc验证码

实现验证码的功能网上都比较的散，综合以前学的内容做一个总结，struts与springmvc都使用同一个ImagUtil.java，只是action不同。
当时学习的时候的一个ImageUtil.java如下

package com.zqw.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.ImageFormatException;
import com.sun.image.codec.jpeg.JPEGCodec;
import com.sun.image.codec.jpeg.JPEGImageEncoder;

/**
 * 验证码
 * @author Administrator
 *
 */
public 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'
	};
	
	private static final int SIZE = 4;
	private static final int LINES = 5;
	private static final int WIDTH = 80;
	private static final int HEIGHT = 30;
	private static final int FONT_SIZE = 28;
	
	public static Map<String,BufferedImage> createIamge(){
		BufferedImage image = new BufferedImage
		(WIDTH,HEIGHT,BufferedImage.TYPE_INT_RGB);
		Graphics g = image.getGraphics();
		g.setColor(Color.LIGHT_GRAY);
		g.fillRect(0, 0, WIDTH, HEIGHT);
		//随机获取4位字符
		Random r = new Random();
		StringBuilder sp = new StringBuilder();
		for(int i=0;i<SIZE;i++){
			int index = r.nextInt(chars.length);
			g.setColor(getRandomColor());
			g.setFont(new Font(null,Font.ITALIC,FONT_SIZE));
			g.drawString(chars[index]+"", (i)*WIDTH/SIZE, HEIGHT/2+7);
			sp.append(chars[index]);
		}
		
		// 画干扰线
		for (int i = 1; i <= LINES; i++) {
			g.setColor(getRandomColor());
			g.drawLine(r.nextInt(WIDTH), r.nextInt(HEIGHT),
					r.nextInt(WIDTH), r.nextInt(HEIGHT));
		}
		
		
		Map<String,BufferedImage> map = 
			new HashMap<String,BufferedImage>();
		map.put(sp.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){
		//压缩内存映像图片		
		ByteArrayOutputStream bos = new ByteArrayOutputStream();
		JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(bos);
		//压缩图片
		try {
			encoder.encode(image);
		} catch (ImageFormatException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		}
		InputStream input = new ByteArrayInputStream(bos.toByteArray());
		return input;
	}

}

struts框架下：
生成验证码的CheckCodeActionStruts.java

package com.zqw.web.action;

import java.awt.image.BufferedImage;
import java.io.InputStream;
import java.util.Map;

import org.springframework.stereotype.Controller;

import com.opensymphony.xwork2.ActionContext;
import com.zqw.netctoss.util.ImageUtil;
@Controller
public class CheckCodeActionStruts {
	private InputStream input;
	public String execute(){
		
		Map<String,BufferedImage> map = ImageUtil.createIamge();//产生图片
		String code = map.keySet().iterator().next();
		BufferedImage image = map.get(code);
		ActionContext actionContext = ActionContext.getContext();
		Map session = actionContext.getSession();
		session.put("code", code);
		input = ImageUtil.getInputStream(image);//压缩图片并输出
		return "success";
		
	}
	public InputStream getInput() {
		return input;
	}
}

struts.xml的配置

		<action name="checkCode" class="com.zqw.web.action.CheckCodeActionStruts">
			<result type="stream">
				<param name="inputName">input</param>
			</result> 
		</action>

springMVC框架下只是action稍有不同,springMVC框架下：

package com.zqw.web.action;

import java.awt.image.BufferedImage;
import java.io.IOException;
import java.io.InputStream;
import java.util.Map;

import javax.imageio.ImageIO;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;

import com.zqw.netctoss.util.ImageUtil;
@Controller("checkCodeActionSpringMVC")
public class CheckCodeActionSpringMVC {
	@RequestMapping(value="/checkCode.do" )
	public void execute(HttpServletRequest req,HttpServletResponse resp) throws IOException{	
		Map<String,BufferedImage> map = ImageUtil.createIamge();//产生图片
		String code = map.keySet().iterator().next();
		BufferedImage image = map.get(code);
		req.getSession().setAttribute("code", code);
	       ServletOutputStream sos = resp.getOutputStream(); 
	        ImageIO.write(image, "jpeg", sos); 
	        sos.close(); 
	}
}

都使用相同的前台页面，点击更换图片则是参考网上的写法。

   	   		 function changeImg() { 
        var imgSrc = $("#imgObj"); 
        var src = imgSrc.attr("src"); 
        imgSrc.attr("src", chgUrl(src)); 
    } 
    //时间戳     
    //为了使每次生成图片不一致，即不让浏览器读缓存，所以需要加上时间戳     
    function chgUrl(url) { 
        var timestamp = (new Date()).valueOf(); 
        url = url.substring(0, 17); 
        if ((url.indexOf("&") >= 0)) { 
            url = url + "×tamp=" + timestamp; 
        } else { 
            url = url + "?timestamp=" + timestamp; 
        } 
        return url; 
    } 
   		</script>


                    <td class="login_info">验证码：</td>
                    <td class="width70"><input name="checkCode" type="text" class="width70" /></td>
                    <td>[img]checkCode" alt="验证码" id="imgObj" onclick="changeImg()[/img]</td>  
                    <td><span class="required"></span><br></td>              
                </tr>        

如图：