我试图在Spring MVC中运行一个项目。这是代码

index.jsp

<%@page contentType="text/html" pageEncoding="UTF-8"%>
<%@taglib prefix="form" uri="http://www.springframework.org/tags/form" %>



    
        
        
    

    
        
Spring 3 Register!
        click
        
            

                

                    
Spring MVC Form Demo - Registration
                
                

                    
User Name
                    

                
                

                    
Password
                    

                
                

                    
Email
                    

                
                

                    
BirthDate (mm/dd/yyyy)
                    

                
                

                    
Profession
                    

                
                

                    

                

            
        
    

RegistrationController.java

/*
 * To change this license header, choose License Headers in Project Properties.
 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */

package RegisterInfo;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;

/**
 *
 * @author Harshit Shrivastava
 */
import RegisterInfo.model.User;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.ModelAttribute;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.ui.Model;

@Controller
@RequestMapping(value = "/register")
public class RegistrationController {

    @RequestMapping(method = RequestMethod.GET)
    public String viewRegistration(Model model)
    {
        User userForm = new User();
                model.addAttribute("userForm", new User());

                /*List professionList = new ArrayList();
                professionList.add("Developer");
                professionList.add("Designer");
                professionList.add("IT Manager");
                model.put("professionList", professionList);*/
        return "index";
    }

    @RequestMapping(method = RequestMethod.POST)
    public String processRegistration(@ModelAttribute("userForm") User user, Map model)
    {       
        System.out.println("Username : " + user.getUserName());
        model.put("userForm", new User());
        return "index";
    }
}

User.java

/*
 * To change this license header, choose License Headers in Project Properties.
 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */

package RegisterInfo.model;

/**
 *
 * @author Harshit Shrivastava
 */
import java.util.Date;

public class User {
    private String username;
    private String password;
    private String email;
    private Date birthDate;
    private String profession;

    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 getEmail()
    {
        return email;
    }
    public void setEmail(String email)
    {
        this.email = email;
    }
        public Date getBirthDate()
    {
        return birthDate;
    }
    public void setBirthDate(Date birthDate)
    {
        this.birthDate = birthDate;
    }
        public String getProfession()
    {
        return profession;
    }
    public void setProfession(String profession)
    {
        this.profession = profession;
    }
}

web.xml

    
        contextConfigLocation
        /WEB-INF/dispatcher-servlet.xml
    
    
        org.springframework.web.context.ContextLoaderListener
    
    
        dispatcher
        org.springframework.web.servlet.DispatcherServlet
        2
    
    
        dispatcher
        *.htm
    
    
        
            30
        
    
    
        index.htm
    

dispatcher-servlet.xml

    

    
    
    
    
        
            
                indexController
            
        
    

    

    
    

项目结构：

在上面的程序中，我总是得到404 not found status。我试过了

http：// localhost：8080 / RegisterInfoMaven / index

http：// localhost：8080 / RegisterInfoMaven / index.htm

两者都不起作用。

当我从项目中删除web.xml和dispatcher-servlet.xml时，它可以http://localhost:8080/RegisterInfoMaven/index.jsp很好地加载，但是正如我所说的web.xml & dispatcher-servlet.xml，它再次开始404 not found出现错误。

web.xml & dispatcher-servlet.xml文件有什么问题？

第一。web.xml文件中的映射：

   dispatcher
   *.html

意味着，调度程序Servlet将仅处理以结尾的请求.html。将其更改为下一个：

   dispatcher
   /

之后，调度程序servlet将处理所有传入的请求。

第二。来自您的解析器声明dispatcher-servlet.xml：

意味着，当Controller方法返回String值时，解析器将在任何值/WEB-INF/jsp之前和.jsp之后添加。然后将使用该名称查找文件。因此，您需要在jsp目录中创建WEB-INF目录，并将jsp文件放在此处。

第三。当您输入类似http：// localhost：8080 / index的内容时，spring会尝试查找标有的 Controller 类或方法@RequestMapping(value = "/index")，而不是文件 index.jsp。

因此，您必须声明标有的Controller方法@RequestMapping(value = "/index")。您的请求字符串将看起来像http：// localhost：8080 / index这样的东西，没有任何扩展名。