前台jsp页面与servlet传输图片验证码-蒲公英云

前台jsp页面与servlet传输图片验证码

我就是我 2022-05-16 08:38 219阅读 0赞

效果图

<%@page import=”java.util.*“%>
<%@ page language=”java” contentType=”text/html; charset=UTF-8” pageEncoding=”UTF-8”%>
<!DOCTYPE html>

Insert title here

验证码类

package cn.itcast.vcode.utils;

import java.awt.BasicStroke;
import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics2D;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.io.OutputStream;
import java.util.Random;

import javax.imageio.ImageIO;

public class VerifyCode {
private int w = 70;
private int h = 35;
private Random r = new Random();
// {“宋体”, “华文楷体”, “黑体”, “华文新魏”, “华文隶书”, “微软雅黑”, “楷体_GB2312”}
private String[] fontNames = {“宋体”, “华文楷体”, “黑体”, “微软雅黑”, “楷体_GB2312”};
private String codes = “23456789abcdefghjkmnopqrstuvwxyzABCDEFGHJKMNPQRSTUVWXYZ”;
private Color bgColor = new Color(255, 255, 255);
private String text ;

private Color randomColor () \{  
    int red = r.nextInt(150);  
    int green = r.nextInt(150);  
    int blue = r.nextInt(150);  
    return new Color(red, green, blue);  
\}  
private Font randomFont () \{  
    int index = r.nextInt(fontNames.length);  
    String fontName = fontNames\[index\];  
    int style = r.nextInt(4);  
    int size = r.nextInt(5) + 24;   
    return new Font(fontName, style, size);  
\}  
private void drawLine (BufferedImage image) \{  
    int num  = 3;  
    Graphics2D g2 = (Graphics2D)image.getGraphics();  
    for(int i = 0; i < num; i++) \{  
        int x1 = r.nextInt(w);  
        int y1 = r.nextInt(h);  
        int x2 = r.nextInt(w);  
        int y2 = r.nextInt(h);   
        g2.setStroke(new BasicStroke(1.5F));   
        g2.setColor(Color.BLUE);   
        g2.drawLine(x1, y1, x2, y2);  
    \}  
\}  
private char randomChar () \{  
    int index = r.nextInt(codes.length());  
    return codes.charAt(index);  
\}  
private BufferedImage createImage () \{  
    BufferedImage image = new BufferedImage(w, h, BufferedImage.TYPE\_INT\_RGB);   
    Graphics2D g2 = (Graphics2D)image.getGraphics();   
    g2.setColor(this.bgColor);  
    g2.fillRect(0, 0, w, h);  
     return image;  
\}  
public BufferedImage getImage () \{  
    BufferedImage image = createImage();   
    Graphics2D g2 = (Graphics2D)image.getGraphics();  
    StringBuilder sb = new StringBuilder();  
    // 向图片中画4个字符  
    for(int i = 0; i < 4; i++)  \{  
        String s = randomChar() + "";   
        sb.append(s);   
        float x = i \* 1.0F \* w / 4;   
        g2.setFont(randomFont());   
        g2.setColor(randomColor());   
        g2.drawString(s, x, h-5);   
    \}  
    this.text = sb.toString();   
    drawLine(image);   
    return image;          
\}  
public String getText () \{  
    return text;  
\}  
public static void output (BufferedImage image, OutputStream out)   
            throws IOException \{  
    ImageIO.write(image, "JPEG", out);  
\}

}

package com.zhang.test;

import java.awt.image.BufferedImage;
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import cn.itcast.vcode.utils.VerifyCode;

/**
* Servlet implementation class GetImgServlet
*/
@WebServlet(urlPatterns= {“/GetImgServlet”,”/login.action”})
public class GetImgServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
public GetImgServlet() {
super();

\}  
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException \{  
             String type=request.getRequestURI();  
             if(type.endsWith("GetImgServlet")) \{  
                   VerifyCode vc = new VerifyCode();                          
                    BufferedImage bi = vc.getImage();                                              
                    request.getSession().setAttribute("yzm", vc.getText());                                      
                    vc.output(bi, response.getOutputStream());  
             \}else \{  
                 String mess=request.getSession().getAttribute("yzm").toString().toLowerCase();  
                 String qtyzm=request.getParameter("qtyzm").toLowerCase();  
                 System.out.println(mess+"\*\*\*"+qtyzm);  
                if(mess.equals(qtyzm)) \{  
                     response.getWriter().write("successLogin");  
                \}else \{  
                     response.getWriter().write("failLogin");  
                \}                       
             \}  
\}  
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException \{  
    doGet(request, response);  
\}