点击登陆会出现404 哪里错了老师帮看下

package com.imooc.servlet;

import java.io.FileOutputStream;

import java.io.IOException;

import java.io.InputStream;

import java.io.OutputStream;

import java.util.ArrayList;

import java.util.HashMap;

import java.util.List;

import java.util.Map;

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 org.apache.commons.fileupload.FileItem;

import org.apache.commons.fileupload.FileUploadException;

import org.apache.commons.fileupload.disk.DiskFileItemFactory;

import org.apache.commons.fileupload.servlet.ServletFileUpload;

import com.imooc.cus.User;

import com.imooc.utils.UploadUtils;

/**

* Servlet implementation class RegistServlet

@WebServlet("/RegistServlet")

public class RegistServlet extends HttpServlet {

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

//数据的传输

//文件基本操作

try {

//创建一个map值用于保存接收到的数据；

Map<String,String> map=new HashMap<String,String>();

//1创建一个磁盘文件项工厂对象

DiskFileItemFactory diskFileItemFactory=new DiskFileItemFactory();

//2创建一个核心解析类

ServletFileUpload servletFileUpload=new ServletFileUpload(diskFileItemFactory);

//3解析reqest请求，返回的是List集合，List集合存放的是FileItem对象

List<FileItem> list=servletFileUpload.parseRequest(request);

//定义一个list的集合，用来保存兴趣爱好数据

List<String> hobbyList=new ArrayList<String>();

//4遍历集合，获得每个fileItem，判断是表单项还是文件上传项

String url=null;

for(FileItem fileItem:list) {

//判断是表单项还是文件上传项

if(fileItem.isFormField()) {

//普通表单项

String name=fileItem.getFieldName();//获得表单项name属性都值

String value=fileItem.getString("UTF-8");//获得表单项的值

System.out.println(name+" "+value);

if("hobby".equals(name)) {

String hobbyValue=fileItem.getString("UTF-8");

hobbyList.add(hobbyValue);

//hobbyValue=hobbyList.toString().substring(1,hobbyList.toString().length()-1);

System.out.println(name+" "+hobbyList);

map.put(name,hobbyValue);

}else {

map.put(name,value);

}

}else {

//文件上传

//文件上传功能

//获得文件上传的名字

String filename=fileItem.getName();

if(filename!=null && !"".equals(filename)) {

String uuidFileName=UploadUtils.getUUIDFileName(filename);

//获得文件上传都数据

InputStream is=fileItem.getInputStream();

//获得文件上传的路径

String path=this.getServletContext().getRealPath("/upload");

//将输入流对接到输出流

url=path+"\\"+uuidFileName;

OutputStream os=new FileOutputStream(url);

int len=0;

byte[] b=new byte[1024];

while((len=is.read(b))!=-1) {

os.write(b,0,len);

}

is.close();

os.close();

}

System.out.println(map);

//将注册信息放到List集合中

List<User> userlist=(List<User>)this.getServletContext().getAttribute("list");

//检测用户名

for(User u:userlist) {

if(u.getUsername().equals(map.get("username"))) {

request.setAttribute("msg", "用户名已存在！");

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

return;

}

//创建一个User对象

User userList=new User();

userList.setHobby(map.get("hobby"));

userList.setPassword(map.get("password"));

userList.setNickname(map.get("nickname"));

userList.setSex(map.get("sex"));

userList.setUsername(map.get("username"));

userList.setUsername(map.get(url));

//将注册信息放到List集合中

userlist.add(userList);

for(User u:userlist) {

System.out.println(u);

}

this.getServletContext().setAttribute("list", userlist);

request.getSession().setAttribute("username", userList.getUsername());

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

} catch (FileUploadException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

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

doGet(request, response);

}

//登陆界面

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

pageEncoding="UTF-8"%>

<!DOCTYPE html>

<html>

<head>

</head>

<body>

<h1>

</h1>

</div>

String username="";

if(session.getAttribute("username")!=null){

username=(String)session.getAttribute("username");

}

<tr>

</tr>

<tr>

</tr>

<tr>

<td colspan="2"><input class="p1" type="checkbox" value="1">记住用户名</td>

</tr>

<tr>

</tr>

</table>

</form>

</div>

</body>

</html>

//注册界面

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

pageEncoding="UTF-8"%>

<!DOCTYPE html>

<html>

<head>

</head>

<body>

<h1>

</h1>

</div>

String msg="";

if(request.getAttribute("msg")!=null){

msg=(String)request.getAttribute("msg");

}

<tr>

</tr>

<tr>

</tr>

<tr>

</tr>

<tr>

<td >

</td>

<td>

<input class="p3" checked type="radio" value="male" name="sex">男

<input type="radio" value="female" name="sex">女

</td>

</tr>

<tr>

</tr>

<tr>

<td>

</td>

<td>

<input class="p3" type="checkbox" value="篮球" name="bobby">篮球

<input type="checkbox" value="足球" name="bobby">足球

<input type="checkbox" value="羽毛球" name="bobby">羽毛球

<input type="checkbox" value="排球" name="bobby">排球

</td>

</tr>

<tr>

</tr>

</table>

</form>

</div>

</body>

</html>

package com.imooc.utils;

import java.util.UUID;

/**

* 文件上传的工作类

* @author

public class UploadUtils {

* 生成唯一的文件名

public static String getUUIDFileName(String fileName) {

int idx=fileName.lastIndexOf(".");

String extion=fileName.substring(idx);

String uuidfilename=UUID.randomUUID().toString().replace("-","")+extion;

return uuidfilename;

}

public static void main(String[] args) {

System.out.println(getUUIDFileName("1.jpg"));

}

package com.imooc.cus;

//包装类

public class User {

private String username;

private String password;

private String nickname;

private String hobby;

private String sex;

private String path;

public String getUsername() {

return username;

}

public void setUsername(String username) {

this.username = username;

}

public String getPassword() {

return password;

}

public void setPassword(String password) {

this.password = password;

}

public String getNickname() {

return nickname;

}

public void setNickname(String nickname) {

this.nickname = nickname;

}

public String getHobby() {

return hobby;

}

public void setHobby(String hobby) {

this.hobby = hobby;

}

public String getSex() {

return sex;

}

public void setSex(String sex) {

this.sex = sex;

}

public String getPath() {

return path;

}

public void setPath(String path) {

this.path = path;

}

@Override

public String toString() {

return "User [username=" + username + ", password=" + password + ", nickname=" + nickname + ", hobby=" + hobby

+ ", sex=" + sex + ", path=" + path + "]";

}

package com.imooc.servlet;

import java.util.ArrayList;

import java.util.List;

import javax.servlet.ServletException;

import javax.servlet.annotation.WebServlet;

import javax.servlet.http.HttpServlet;

import com.imooc.cus.User;

/**

* Servlet implementation class InitServlet

public class InitServlet extends HttpServlet {

@Override

public void init() throws ServletException {

// 创建一个list的集合用于保存用户注册信息

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

//将list导入ServletContext作用域中

this.getServletContext().setAttribute("list",list);

}

//logcss样式

margin:0;

padding:0;

}

body{

background:rgba(238,238,238,0.5);

position:relative;

font-family:"微软雅黑";

height:100%;

width:100%;

background:lightblue;

}

.reg{

height:400px;

width:500px;

position:absolute;

z-index:1;

margin:100px 100px 100px 350px;

background-color:#fff;

}

.header{

height:50px;

width:450px;

overflow:hidden;

margin-left:25px;

border-bottom:1px solid #bebebe;

}

.header h1{

margin-left:30px;

}

.header a{

font-size:18px;

text-decoration:none;

line-height:60px;

padding-left:10px;

}

.a1{

color:#2c689b;

}

.a2{

color:black;

}

.header a:hover{

color:black;

}

.main{

padding:15px;

height:350px;

width:450px;

font-weight:bolder;

font-size:16px;

margin-top:10px;

margin-left:40px;

}

.p1 .p3{

padding-left:10px;

}

.p2{

width:300px;

height:40px;

line-height: 40px;

border:1px solid #d0d6d9;

background: #F9F9F9;

margin-left:20px;

}

.p3{

width:380px;

height:50px;

background-color:lightgreen;

color:black;

}

//reg.css样式

margin:0;

padding:0;

}

body{

background:rgba(238,238,238,0.5);

position:relative;

font-family:"微软雅黑";

height:100%;

width:100%;

background:lightblue;

}

.reg{

height:auto;

width:500px;

position:absolute;

z-index:1;

margin:100px 100px 100px 350px;

background-color:#fff;

}

.header{

height:50px;

width:450px;

overflow:hidden;

margin-left:25px;

border-bottom:1px solid #bebebe;

}

.header h1{

margin-left:50px;

}

.header a{

font-size:18px;

text-decoration:none;

line-height:60px;

}

.a2{

color:#2c689b;

margin-left:10px;

}

.a1{

color:black;

}

.header a:hover{

color:black;

}

.main{

padding:15px;

height:500px;

width:450px;

font-weight:bolder;

font-size:16px;

margin-top:10px;

margin-left:40px;

}

.p1{

padding-left:10px;

}

.p2{

width:300px;

height:40px;

line-height: 40px;

border:1px solid #d0d6d9;

background: #F9F9F9;

margin-left:20px;

}

.p3{

margin-left:20px;

}

.p4{

width:400px;

height:50px;

background-color:lightgreen;

color:black;

}

慕雪1047781 2018-07-28

源自：项目：登录注册功能 3-7 校验用户名是否存在

收起

3回答

提问者慕雪1047781 2018-07-30 11:18:14

这是报错截图

http://localhost:8080/reg_login/RegistServlet //这是注册后的地址栏

web.xml只配了文件上传的工作类，其他都没

收起回答

好帮手慕阿莹 #1

同学的项目工程名字是reg_login么？是eclipse还是IDEA呢？

2018-07-30 14:22:28
提问者慕雪1047781 回复好帮手慕阿莹 #2

eclipse 是 reg_login

2018-07-31 01:29:34
好帮手慕阿莹回复提问者慕雪1047781 #3

因为测试了同学的代码是可以正常访问的， 1、建议同学之间访问http://localhost:8080/reg_login/RegistServlet 试试会不会报404错误， 2、建议同学把注解的方式改为在web.xml,配置一下试试

2018-07-31 10:11:29