Servlet形式的图形验证码

servlet代码如下:

package com.common.web.servlet.verifycode;import java.awt.Color;import java.awt.Font;import java.awt.Graphics;import java.awt.image.BufferedImage;import java.io.IOException;import java.util.Random;import javax.imageio.ImageIO;import javax.servlet.ServletException;import javax.servlet.ServletOutputStream;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import javax.servlet.http.HttpSession;import com.io.hw.awt.color.CustomColor;import com.string.widget.util.ValueWidget;/*** * 生成验证码 * 
需要在web.xml中配置servlet才能访问 * 
 * 
     		
      
       imageVerifyCode
      		
      
       com.common.web.servlet.verifycode.RandomCodeServlet
      	
     	
     		
      
       imageVerifyCode
      		
      
       /imageVerifyCode
      	
      * @author huangwei * @since 20140424 */public class RandomCodeServlet extends HttpServlet {	private static final long serialVersionUID = 2040832365570046619L;	private int width = 60, height = 20;	public void doGet(HttpServletRequest request, HttpServletResponse response)			throws ServletException, IOException {		String picFormat=request.getParameter("picFormat");		// 在内存中创建图象		BufferedImage img = new BufferedImage(width, height,				BufferedImage.TYPE_INT_RGB);		// 获取图形上下文		Graphics g = img.getGraphics();		// 设定背景色		g.setColor(Color.WHITE);		g.fillRect(0, 0, width, height);		// 生成随机类		Random r = new Random();		// 设定字体		Font f = new Font("Times New Roman", Font.PLAIN, 18);		g.setFont(f);		// 画边框		g.setColor(Color.BLACK);		g.drawRect(0, 0, width - 1, height - 1);//		g.setColor(Color.GRAY);				// 随机产生160条干扰线，使图象中的认证码不易被其它程序探测到		for (int i = 0; i < 160; i++) {			g.setColor(CustomColor.getLightColor());			int x = r.nextInt(width);			int y = r.nextInt(height);			int x1 = r.nextInt(12);			int y1 = r.nextInt(12);			g.drawLine(x, y, x + x1, y + y1);		}		StringBuffer sb = new StringBuffer();		int red = 0, green = 0, blue = 0;		// 取随机产生的认证码(4位数字)		for (int i = 0; i < 4; i++) {			String strRand = String.valueOf(r.nextInt(10));			red = r.nextInt(110);			green = r.nextInt(50);			blue = r.nextInt(50);			// 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.setColor(new Color(red, green, blue));			// 将认证码显示到图象中			g.drawString(strRand, 13 * i + 6, 16);			sb.append(strRand);		}		HttpSession session = request.getSession();		session.setAttribute("randomCode", sb.toString());		// 设置页面不缓存		response.setHeader("Pragma", "no-cache");		response.setHeader("Cache-Control", "no-cache");		response.setDateHeader("Expires", 0);		if(ValueWidget.isNullOrEmpty(picFormat)){			picFormat="jpeg";		}		response.setContentType("image/"+picFormat);//		System.out.println("verify code picFormat:"+picFormat);				ServletOutputStream sos = response.getOutputStream();		ImageIO.write(img, picFormat, sos);		sos.close();	}		public void doPost(HttpServletRequest request, HttpServletResponse response)			throws ServletException, IOException {		this.doGet(request, response);	}}

package com.io.hw.awt.color;import java.awt.Color;import java.util.Random;public class CustomColor {    public  static Color red_little=new Color(255,200,200);    public  static Color red_little_more=new Color(255,230,230);    public static Color red_middle=new Color(255,100,100);    public static Color blue_little_ocean=new Color(130,200,255);    public static Color blue_little_gray=new Color(200,200,255);        	public static Color getColor(int r, int g, int b) {		return new Color(r,g,b);	}	/***	 * 	 * @param isLightColour : 浅色(亮色)	 * @return	 */	public static Color getColor(boolean isLightColour){	    int r = randomInt(isLightColour);        int g = randomInt(isLightColour);        int b = randomInt(isLightColour);        while (r == 255 && g == 255 && b == 255)        {            r = randomInt(isLightColour);            g = randomInt(isLightColour);            b = randomInt(isLightColour);        }        return new Color(r, g, b);	}	public static Color getColor(){		return getColor(false);	}	/***	 * 获取 	 * @return	 */	public static Color getLightColor(){        return getColor(true);	}		/***	 * 	 * @param isLightColour : 是否浅色(亮色)	 * @return	 */	public static int randomInt(boolean isLightColour) {		Random dom = new Random();		if(isLightColour){//浅色(亮色)			int base=125;			return dom.nextInt(base)+(255-base);		}else{			return dom.nextInt(255);		}	}	public static int randomInt() {		return randomInt(false/*isLightColour*/);	}	/***	 * 浅色	 * @return	 */	public static int randomIntLightColour() {		return randomInt(true);	}	public static void main(String[] args) {		System.out.println(randomInt());		System.out.println(randomInt());		System.out.println(randomInt());	}}

配置web.xml:

    		
     
      imageVerifyCode
     		
     
      com.common.web.servlet.verifycode.RandomCodeServlet
     	
    	
    		
     
      imageVerifyCode
     		
     
      /imageVerifyCode
     	
    

访问地址:

http://127.0.0.1:8080/tv_mobile/imageVerifyCode?picFormat=gif