jsp 生成验证码

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记录

<%@ page contentType="image/jpeg"    import="java.awt.*,java.awt.image.*,java.util.*,javax.imageio.*"%><%!Color getRandColor(int fc, int bc){Random rd =  new Random();if (fc > 255)fc = 255;if (bc > 255)bc = 255;int r = rd.nextInt(bc - fc);int g = rd.nextInt(bc - fc);int b = rd.nextInt(bc - fc);return new Color(r,g,b);}%><%response.setHeader("Pragma", "No-cache");response.setHeader("Cache-Control","no-cache");response.setDateHeader("Expires", 0);int width = 60, height = 20;BufferedImage image = new BufferedImage(width,height,BufferedImage.TYPE_INT_RGB);Graphics g = image.getGraphics();Random rd = new Random();g.setColor(getRandColor(200,250));g.fillRect(0, 0, width, height);g.setFont(new Font("Times New Roman",Font.PLAIN,18));g.setColor(new Color(255,255,255));g.drawRect(0, 0, width - 1, height - 1);g.setColor(getRandColor(160,200));for (int i=0;i<155;i++){     int x = rd.nextInt(width);     int y = rd.nextInt(height);     int xl = rd.nextInt(12);     int yl = rd.nextInt(12);     g.drawLine(x,y,x+xl,y+yl);}String sRand="";    for (int i=0;i<4;i++){        String rand=String.valueOf(rd.nextInt(10));        sRand+=rand;        g.setColor(new Color(20+rd.nextInt(110),20+rd.nextInt(110),20+rd.nextInt(110)));        g.drawString(rand,13*i+6,16);    }    session.setAttribute("rand",sRand);        g.dispose();ImageIO.write(image, "JPEG", response.getOutputStream());out.clear();out = pageContext.pushBody();%>

作为图片被其他页面调用

<img src = "code.jsp"/>

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