验证码无法显示，而且无法跳转页面，老师帮忙检查下

<%@ page language="java" contentType="text/html; charset=UTF-8"

pageEncoding="UTF-8"%>

<!DOCTYPE html>

<html>

<head>

</head>

<body>

<h1>

</h1>

</div>

<p></p>

</div>

<p></p>

</div>

<p></p>

</div>

</div>

</form>

</div>

</body>

</html>

package com.imooc.domain;

public class User {

private String name;

private String password;

@Override

public String toString() {

return "User [name=" + name + ", password=" + password + "]";

}

public User(String name, String password) {

super();

this.name = name;

this.password = password;

}

public User() {

super();

// TODO Auto-generated constructor stub

}

public String getName() {

return name;

}

public void setName(String name) {

this.name = name;

}

public String getPassword() {

return password;

}

public void setPassword(String password) {

this.password = password;

}

package com.imooc.web.listener;

import java.util.ArrayList;

import java.util.List;

import javax.servlet.ServletContextEvent;

import javax.servlet.ServletContextListener;

import com.imooc.domain.User;

public class InitListener implements ServletContextListener {

@Override

public void contextDestroyed(ServletContextEvent sce) {

// TODO Auto-generated method stub

}

@Override

public void contextInitialized(ServletContextEvent sce) {

List<User> userList=new ArrayList<>();

userList.add(new User("张三","123456"));

userList.add(new User("李四","654321"));

sce.getServletContext().setAttribute("list", userList);

}

package com.imooc.servlet;

import java.io.IOException;

import java.util.List;

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 com.imooc.domain.User;

import com.imooc.utils.UserLogin;

import com.imooc.utils.UserServlet;

/**

* Servlet implementation class LoginServlet

@WebServlet("/login1")

public class LoginServlet extends HttpServlet {

private static final long serialVersionUID = 1L;

/**

* @see HttpServlet#HttpServlet()

public LoginServlet() {

super();

// TODO Auto-generated constructor stub

}

/**

* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)

protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

String code1=request.getParameter("verifyCode");

String code2=(String)request.getSession().getAttribute("checkCode");

if(code1==null || !code1.equals(code2)) {

request.setAttribute("msg", "验证码错误");

request.getRequestDispatcher("/login.jsp").forward(request, response);

return;

}

List<User> userList=(List<User>)request.getServletContext().getAttribute("list");

String name=request.getParameter("username");

String password=request.getParameter("password");

UserServlet user1=new UserLogin();

User user=user1.login(userList, new User(name,password));

if(user==null) {

request.getRequestDispatcher("/login.jsp").forward(request, response);

}else {

response.sendRedirect(request.getContextPath()+"/categoryList.jsp");

}

/**

* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)

protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

// TODO Auto-generated method stub

doGet(request, response);

}

package com.imooc.servlet;

import java.awt.Color;

import java.awt.Font;

import java.awt.Graphics;

import java.awt.Graphics2D;

import java.awt.image.BufferedImage;

import java.io.IOException;

import java.util.Random;

import javax.imageio.ImageIO;

import javax.servlet.ServletException;

import javax.servlet.annotation.WebServlet;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

/**

* Servlet implementation class CheckImgServlet

@WebServlet("/CheckImgServlet")

public class CheckImgServlet extends HttpServlet {

private static final long serialVersionUID = 1L;

/**

* @see HttpServlet#HttpServlet()

public CheckImgServlet() {

super();

// TODO Auto-generated constructor stub

}

/**

* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)

protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

int width=150;

int height=42;

BufferedImage bufferedImage=new BufferedImage(width,height,BufferedImage.TYPE_INT_RGB);

Graphics graphics=bufferedImage.getGraphics();

graphics.setColor(Color.BLUE);

graphics.fillRect(0, 0, width, height);

graphics.setColor(Color.YELLOW);

graphics.drawRect(0, 0, width-1, height-1);

Graphics2D g2d=(Graphics2D)graphics;

g2d.setColor(Color.BLACK);

g2d.setFont(new Font("宋体",Font.BOLD,15));

StringBuffer sb=new StringBuffer();

String words="AQZWSXCDERFVBGTYHNMJUIKLOPqazwsxedcrfvtgbyhnujmiklop0123456789";

int x=0;

Random random=new Random();

for(int i=0;i<4;i++) {

int idx=random.nextInt(words.length());

char ch=words.charAt(idx);

sb.append(ch);

int jiaodu=random.nextInt(60)-30;

double threa=jiaodu*Math.PI/180;

g2d.rotate(threa,x,20);

g2d.drawString(String.valueOf(ch), x, 20);

g2d.rotate(-threa,x,20);

x+=20;

}

ImageIO.write(bufferedImage,"jpg",response.getOutputStream());

request.getSession().setAttribute("checkCode",sb.toString());

}

/**

* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)

protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

// TODO Auto-generated method stub

doGet(request, response);

}

<?xml version="1.0" encoding="UTF-8"?>

<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://xmlns.jcp.org/xml/ns/javaee" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd" id="WebApp_ID" version="3.1">

<display-name>mvcc</display-name>

<welcome-file-list>

<welcome-file>index.html</welcome-file>

<welcome-file>index.htm</welcome-file>

<welcome-file>index.jsp</welcome-file>

<welcome-file>default.html</welcome-file>

<welcome-file>default.htm</welcome-file>

<welcome-file>default.jsp</welcome-file>

</welcome-file-list>

<listener-class>com.imooc.web.listener.InitListener</listener-class>

</listener>

</web-app>

package com.imooc.utils;

import java.util.List;

import com.imooc.domain.User;

public interface UserServlet {

public User login(List<User> userList,User user);

}

package com.imooc.utils;

import java.util.List;

import com.imooc.domain.User;

public class UserLogin implements UserServlet {

@Override

public User login(List<User> userList, User user) {

for(User user1:userList) {

if(user1.getName().equals(user.getName()) && user1.getPassword().equals(user.getPassword())) {

return user1;

}

return null;

}

慕沐2169693 2019-11-04

源自：项目：登录注册功能 6-2 项目作业

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2回答

提问者慕沐2169693 2019-11-04 21:16:54

老师那验证码问题在哪呢

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提问者慕沐2169693 #1

我知道了知道了

2019-11-04 21:57:48

好帮手慕小班 2019-11-04 19:09:55

同学你好，检查同学贴出代码，有如下两个问题：

1、404问题，根据贴出的运行效果，这里直接访问了login1并没有加项目名，导致没有找到对应地址，原因是以"/"开头，表示项目根目录，会直接直接从localhost:8080后直接访问，这里login1是以"/"开头，则直接访问login1，所以建议同学在/login1前添加项目名称，比如：

2、验证码图片不展示，是因为同学的servlet名称写错啦，例如：

CheckImgServlet与CheckImgSrevlet不一样呐，建议同学将这里的名称统一。

如果我的回答解决了你的疑惑，请采纳。祝：学习愉快~

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提问者慕沐2169693 #1

老师你说的我都改过来了，可是一直无法跳转图书分类页面，是地址输入得问题还是验证码查验有问题啊

2019-11-04 22:44:39
好帮手慕小班回复提问者慕沐2169693 #2

同学你好,1、这里同学无法跳转图书分类页面，在浏览器窗口运行效果是什么呐，是有错误吗，404还是500。2、验证码查验，同学可以输出一下code1与code2的值，查看是否一致呐。建议同学将修改后的运行效果贴出呐。如果我的回答解决了你的疑惑，请采纳。祝：学习愉快~

2019-11-05 10:57:12