Thiết kế website giá rẻ

Question

I’m new to spring boot and built the MVC project but I’m facing the error:
Error:

Whitelabel Error Page

This application has no explicit mapping for /error, so you are seeing this as a fallback.

Sat Dec 07 18:22:16 IST 2024

There was an unexpected error (type=Not Found, status=404).

Below is the complete code.

DemoGoBootSpringMvcApplication.java

package com.example.prs;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.ComponentScan;

@SpringBootApplication
@ComponentScan(value= {"com.infosys.prs.controller"})
@ComponentScan(value= {"com.infosys.prs.service"})
public class DemoGoBootSpringMvcApplication {

    public static void main(String[] args) {
        SpringApplication.run(DemoGoBootSpringMvcApplication.class, args);
    }

}

HomeController.java

package com.example.prs.controller;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.servlet.ModelAndView;

@Controller
public class HomeController {
    @GetMapping(value="/")
    public ModelAndView getHomeDetails() {
        return new ModelAndView("infyGoHome",""," ");
    }
}

RegistrationController.java

package com.example.prs.controller;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.core.env.Environment;
import org.springframework.stereotype.Controller;
import org.springframework.validation.BindingResult;
import org.springframework.validation.annotation.Validated;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.ModelAttribute;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.servlet.ModelAndView;

import com.example.prs.exception.UserIdAlreadyPresentException;
import com.example.prs.model.User;
import com.example.prs.service.RegistrationService;

import org.springframework.ui.Model;
import jakarta.validation.Valid;

@Controller
public class RegistrationController {
    @Autowired
    @Qualifier("registrationService")
    private RegistrationService registrationService;
    
    @Autowired
    private Environment environment;
    
    private String command = "command";
    private String register = "register";
    
    @GetMapping(value="/register")
    public ModelAndView register(Model model) {
        return new ModelAndView(register,command,new User());
    }
    
    @PostMapping(value="/registerUser")
    public ModelAndView addCustomer(@Valid @ModelAttribute("command") User user, BindingResult result, Model model) {
        ModelAndView modelAndView = new ModelAndView();
        if(result.hasErrors()) {
            modelAndView = new ModelAndView(register,command,user);
        }else {
            try {
                registrationService.registerUser(user);
                modelAndView = new ModelAndView(register,command,user);
                modelAndView.addObject("succeedMessage",environment.getProperty("RegistrationController.SUCCESSFUL_REGISTRATION"));
            }catch(UserIdAlreadyPresentException e) {
                if(e.getMessage().contains("RegistrationService")) {
                    modelAndView = new ModelAndView(register);
                    modelAndView.addObject(command,user);
                    modelAndView.addObject("message",environment.getProperty(e.getMessage()));
                }
            }
        }
        return modelAndView;
    }
}

UserEntity.java

package com.example.prs.entity;

import jakarta.persistence.*;


@Entity
@Access(AccessType.FIELD)
@Table(name="USER_DETAILS")
public class UserEntity {
    @Id
    @Column(name="userid")
    private String userId;
    private String password;
    private String name;
    private String city;
    private String email;
    private String phone;
    public String getUserId() {
        return userId;
    }
    public void setUserId(String userId) {
        this.userId = userId;
    }
    public String getPassword() {
        return password;
    }
    public void setPassword(String password) {
        this.password = password;
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public String getCity() {
        return city;
    }
    public void setCity(String city) {
        this.city = city;
    }
    public String getEmail() {
        return email;
    }
    public void setEmail(String email) {
        this.email = email;
    }
    public String getPhone() {
        return phone;
    }
    public void setPhone(String phone) {
        this.phone = phone;
    }
    
}

User.java

package com.example.prs.model;

import jakarta.validation.constraints.Email;
import jakarta.validation.constraints.NotNull;
import jakarta.validation.constraints.Size;

public class User {
    @NotNull(message="USerID must not be blank.")
    @Size(min=4, max=15, message="USerId must be between 4 to 15 characters")
    private String userId;
    
    @NotNull(message="Password must not be blank.")
    @Size(min=8, max=15, message="USerId must be between 8 to 15 characters")
    private String password;
    
    @NotNull(message="Name must not be blank.")
    @Size(min=4, max=15, message="Name must be between 4 to 15 characters")
    private String name;
    
    @NotNull(message="City must not be blank.")
    private String city;
    
    @NotNull(message="Email must not be blank.")
    @Email
    private String email;
    
    @NotNull(message="PhoneNumber must not be blank.")
    @Size(min=10, max=10, message="PhoneNumber must be etween 10 digits.")
    private String phone;

    public String getUserId() {
        return userId;
    }

    public void setUserId(String userId) {
        this.userId = userId;
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getCity() {
        return city;
    }

    public void setCity(String city) {
        this.city = city;
    }

    public String getEmail() {
        return email;
    }

    public void setEmail(String email) {
        this.email = email;
    }

    public String getPhone() {
        return phone;
    }

    public void setPhone(String phone) {
        this.phone = phone;
    }
    
    
}

UserRepository.java

package com.example.prs.repository;

import org.springframework.data.jpa.repository.JpaRepository;
import org.springframework.stereotype.Repository;

import com.example.prs.entity.UserEntity;

@Repository
public interface UserRepository extends JpaRepository<UserEntity, String>{

}

RegistrationService.java

package com.example.prs.service;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
import org.springframework.stereotype.Service;

import com.example.prs.entity.UserEntity;
import com.example.prs.exception.UserIdAlreadyPresentException;
import com.example.prs.model.User;
import com.example.prs.repository.UserRepository;

@Service
@Component
public class RegistrationService {
    
    @Autowired
    public UserRepository userRepository;
    
    public void registerUser(User user) throws UserIdAlreadyPresentException{
        boolean ue = userRepository.existsById(user.getUserId());
        if(ue) throw new UserIdAlreadyPresentException("RegistrationService.USERID_PRESENT");
        
        UserEntity userEntity = new UserEntity();
        userEntity.setCity(user.getCity());
        userEntity.setEmail(user.getEmail());
        userEntity.setPassword(user.getPassword());
        userEntity.setPhone(user.getPhone());
        userEntity.setUserId(user.getUserId());
        
        userRepository.saveAndFlush(userEntity);
    }
}

application.properties

spring.application.name=DemoGoBoot_SpringMVC
server.port=8080
server.servlet.context-path = /register
spring.mvc.view.prefix = WEB-INF/pages/
spring.mvc.view.suffix = .jsp
spring.datasource.url = jdbc:mysql://localhost/db_practice_dev
spring.datasource.username = root
spring.datasource.password = root

pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>3.4.0</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.example.prs</groupId>
    <artifactId>DemoGoBoot_SpringMVC</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>war</packaging>
    <name>DemoGoBoot_SpringMVC</name>
    <description>Implementing web layer with Spring MVC</description>
    <url/>
    <licenses>
        <license/>
    </licenses>
    <developers>
        <developer/>
    </developers>
    <scm>
        <connection/>
        <developerConnection/>
        <tag/>
        <url/>
    </scm>
    <properties>
        <java.version>17</java.version>
    </properties>
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-jpa</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>com.mysql</groupId>
            <artifactId>mysql-connector-j</artifactId>
            <scope>runtime</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-tomcat</artifactId>
            <scope>provided</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-validation</artifactId>
        </dependency>
        <dependency>
            <groupId>org.apache.tomcat.embed</groupId>
            <artifactId>tomcat-embed.japser</artifactId>
            <scope>provided</scope>
        </dependency>
        <dependency>
            <groupId>jstl</groupId>
            <artifactId>jstl</artifactId>
            <version>1.2</version>
            <scope>provided</scope>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

</project>

Structure of my project

Please help me with the error because I’m stuck with further learnings here

Thiết kế website giá rẻ

Danh mục

Spring boot MVC project is not working due to status=404 Spring boot