VerifyServlet.java如何处理长尾词查询请求？

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javapackage cn.web.servlet;

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;

public class VerifyServlet { public void generateImage() throws IOException { BufferedImage image=new BufferedImage(100, 30, BufferedImage.TYPE_INT_RGB); Graphics g=image.getGraphics(); g.setColor(Color.WHITE); g.fillRect(0, 0, 100, 30);

String code=; Random random=new Random(); for (int i=0; i <4; i++) { int num=random.nextInt(10); code +=num; g.setColor(new Color(random.nextInt(255), random.nextInt(255), random.nextInt(255))); g.setFont(new Font(Arial, Font.BOLD, 18)); g.drawString(String.valueOf(num), 20 * i + 10, 20); }

ImageIO.write(image, JPEG, new java.io.File(verifyImage.jpg)); }}

VerifyServlet.java

package cn.web.servlet; 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.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; public class VerifyServlet extends HttpServlet { public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { // 使用java图形界面技术绘制一张图片 int charNum = 4; int width = 20 * 4; int height = 28; // 1. 创建一张内存图片 BufferedImage bufferedImage = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB); // 2.获得绘图对象 Graphics graphics = bufferedImage.getGraphics(); // 3、绘制背景颜色 graphics.setColor(Color.YELLOW); graphics.fillRect(0, 0, width, height); // 4、绘制图片边框 graphics.setColor(Color.GRAY); graphics.drawRect(0, 0, width - 1, height - 1); // 5、输出验证码内容 graphics.setColor(Color.RED); graphics.setFont(new Font("宋体", Font.BOLD, 22)); // 随机输出4个字符 String s = "ABCDEFGHGKLMNPQRSTUVWXYZ23456789"; Random random = new Random(); // session中要用到 String msg = ""; int x = 5; for (int i = 0; i < charNum; i++) { int index = random.nextInt(32); String content = String.valueOf(s.charAt(index)); msg += content; graphics.setColor(new Color(random.nextInt(255), random.nextInt(255), random.nextInt(255))); graphics.drawString(content, x, 22); x += 20; } // 6、绘制干扰线 graphics.setColor(Color.GRAY); for (int i = 0; i < 5; i++) { int x1 = random.nextInt(width); int x2 = random.nextInt(width); int y1 = random.nextInt(height); int y2 = random.nextInt(height); graphics.drawLine(x1, y1, x2, y2); } // 释放资源 graphics.dispose(); // 图片输出 ImageIO ImageIO.write(bufferedImage, "jpg", response.getOutputStream()); } public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { } }