得到错误java：找不到符号类

Question

我正在使用 spring mvc+spring boot 休眠。在我可以运行应用程序之前突然出现此错误。以下是错误信息

C:\Users\User_2\pdrm\src\main\java\com\example\RegisterController.java 错误:(23, 19) java: 找不到符号 符号：类 Default_profilesRepository 位置：包 com.example 错误:(33, 13) java: 找不到符号 符号：类 Default_profilesRepository 位置：com.example.RegisterController 类

这里是 RegisterController 类

   package com.example;

   import com.example.*;
   import org.springframework.beans.factory.annotation.Autowired;
   import org.springframework.stereotype.Controller;
   import org.springframework.ui.Model;
   import org.springframework.validation.BindingResult;
   import org.springframework.validation.Errors;
   import org.springframework.web.bind.annotation.*;
   import org.springframework.web.context.request.WebRequest;

   import javax.validation.Valid;
   import java.io.UnsupportedEncodingException;
   import java.math.BigInteger;
   import java.security.MessageDigest;
   import java.security.NoSuchAlgorithmException;
   import java.util.Date;

   import java.util.UUID;

   import static jdk.nashorn.internal.objects.NativeString.substr;

    @Controller

    public class RegisterController {

    @Autowired
    private Default_profilesRepository profilesRepository;

@Autowired
private Default_usersRepository usersRepository;

@RequestMapping("/login")
public String Login(Model model)
{
    model.addAttribute("user", new Default_users());

    return "login";
}

@RequestMapping("/loginProcess")
public String loginProcess(@ModelAttribute(value="user") @Valid Default_users user, BindingResult bindingResultUser)
{
    if(bindingResultUser.hasErrors())
    {
        return "login";
    }

    Default_users user2 = usersRepository.findByEmail(user.getEmail());
    if (user2 != null) {


        String passwordToHash = user.getPassword();
        String saltDB = user2.getSalt();
        String Password = null;
        try {
            // Create MessageDigest instance for MD5
            MessageDigest md = MessageDigest.getInstance("MD5");
            //Add password bytes to digest
            md.update(passwordToHash.getBytes());
            //Get the hash's bytes
            byte[] bytes = md.digest();
            //This bytes[] has bytes in decimal format;
            //Convert it to hexadecimal format
            StringBuilder sb = new StringBuilder();
            for (int i = 0; i < bytes.length; i++) {
                sb.append(Integer.toString((bytes[i] & 0xff) + 0x100, 16).substring(1));
            }
            //Get complete hashed password in hex format

        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
        }
        String uuid = UUID.randomUUID().toString();
        MessageDigest crypt = null;
        try {
            crypt = MessageDigest.getInstance("SHA-1");
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
        }
        crypt.reset();
        try {
            String tets = passwordToHash + saltDB;
            crypt.update(tets.getBytes("UTF-8"));
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        }
        Password = new BigInteger(1, crypt.digest()).toString(16);
        System.out.println(user2.getPassword());
        System.out.println(Password);
        System.out.println(saltDB);

        if (Password.equals(user2.getPassword())) {


            return "/home";
        } else {
            return "/login";
        }
    }
    return "/home";
}

@GetMapping("/register")
public String Register(Model model)

{
    model.addAttribute("profile", new Default_profiles());
    model.addAttribute("user", new Default_users());

    return "register";
}

@RequestMapping("/save")
public String Process(@ModelAttribute(value="user") @Valid Default_users user, BindingResult bindingResultUser, WebRequest request, Errors errors, @ModelAttribute(value="profile") @Valid Default_profiles profile, BindingResult bindingResultProfile)

{

    Date date = new Date();
    int unixTime = (int) date.getTime() / 1000;

    Default_users userExists = usersRepository.findByEmail(user.getEmail());
    System.out.println(userExists);
    if (userExists != null) {
        bindingResultUser
                .rejectValue("email", "error.user",
                        "There is already a user registered with the email provided");
    }
    if(bindingResultUser.hasErrors() || bindingResultProfile.hasErrors())
    {
        return "register";
    }

    String passwordToHash = user.getPassword();
    String salt = null;
    String Password = null;
    try {
        // Create MessageDigest instance for MD5
        MessageDigest md = MessageDigest.getInstance("MD5");
        //Add password bytes to digest
        md.update(passwordToHash.getBytes());
        //Get the hash's bytes
        byte[] bytes = md.digest();
        //This bytes[] has bytes in decimal format;
        //Convert it to hexadecimal format
        StringBuilder sb = new StringBuilder();
        for (int i = 0; i < bytes.length; i++) {
            sb.append(Integer.toString((bytes[i] & 0xff) + 0x100, 16).substring(1));
        }
        //Get complete hashed password in hex format
        salt = sb.toString();
        salt = substr(salt, 0, 6);
    } catch (NoSuchAlgorithmException e) {
        e.printStackTrace();
    }
    String uuid = UUID.randomUUID().toString();
    MessageDigest crypt = null;
    try {
        crypt = MessageDigest.getInstance("SHA-1");
    } catch (NoSuchAlgorithmException e) {
        e.printStackTrace();
    }
    crypt.reset();
    try {
        String tets = passwordToHash + salt;
        crypt.update(tets.getBytes("UTF-8"));
    } catch (UnsupportedEncodingException e) {
        e.printStackTrace();
    }
    Password = new BigInteger(1, crypt.digest()).toString(16);
    user.setPassword(Password);
    user.setSalt(salt);
    user.setGroup_id(2);
    user.setIp_address("");
    user.setActive(1);
    user.setActivation_code("");
    user.setCreated_on(unixTime);
    user.setLast_login(unixTime);
    user.setForgotten_password_code("");
    user.setRemember_code("hgshd");

    profile.setCreated(date);
    profile.setUpdated(date);
    profile.setCreated_by(unixTime);
    profile.setOrdering_count(0);
    profile.setDisplay_name(user.getEmail());
    profile.setDob(0);
    profile.setGender("");
    profile.setPhone("");
    profile.setAddress_line1("");
    profile.setAddress_line2("");
    profile.setAddress_line3("");
    profile.setPostcode("");
    profile.setUpdated_on(0);
    profile.setCountry("MY");
    profile.setUser_id(user);

    profilesRepository.save(profile);

    return "/result";

      }

     `` }

这里Default_profilesRepository

 package com.example;

 import org.springframework.data.repository.CrudRepository;


  public interface Default_profilesRepository extends 
   CrudRepository<Default_profiles, Integer> {


   }

配置文件

package com.example;


 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.beans.factory.annotation.Qualifier;
 import org.springframework.context.annotation.ComponentScan;
 import org.springframework.context.annotation.Configuration;
 import org.springframework.security.config.annotation.authentication.builders.AuthenticationManagerBuilder;
  import org.springframework.security.config.annotation.web.builders.HttpSecurity;
  import org.springframework.security.config.annotation.web.builders.WebSecurity;
  import org.springframework.security.config.annotation.web.configuration.EnableWebSecurity;
  import org.springframework.security.config.annotation.web.configuration.WebSecurityConfigurerAdapter;
  import org.springframework.security.web.util.matcher.AntPathRequestMatcher;

  import javax.sql.DataSource;

  @Configuration
  @EnableWebSecurity
  @ComponentScan
  public class SpringSecurityConfig extends WebSecurityConfigurerAdapter {

  @Qualifier("dataSource")
@Autowired
private DataSource dataSource;

@Autowired
public void configAuthentication(AuthenticationManagerBuilder auth) throws Exception {

    auth.jdbcAuthentication().dataSource(dataSource)
            .usersByUsernameQuery(
                    "select u from Default_users u where u.email=?");
}


@Override
protected void configure(HttpSecurity http) throws Exception {

    http.
            authorizeRequests()
            .antMatchers("/").permitAll()
            .antMatchers("/login").permitAll()
            .antMatchers("/registration").permitAll()
            .anyRequest().authenticated()
            .and()
            .formLogin()
            .and().csrf().disable().formLogin()
            .loginPage("/login").failureUrl("/login?error=true")
            .defaultSuccessUrl("/home")
            .and().logout()
            .logoutRequestMatcher(new AntPathRequestMatcher("/logout"))
            .logoutSuccessUrl("/").and().exceptionHandling()
            .accessDeniedPage("/access-denied");

    http.csrf().disable();
    http.headers().frameOptions().disable();

}

@Override
public void configure(WebSecurity web) throws Exception {
    web
            .ignoring()
            .antMatchers("/resources/**", "/static/**", "/css/**", "/js/**", "/images/**");
}

}

主应用程序

package com.example;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cache.annotation.EnableCaching;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.data.jpa.repository.config.EnableJpaRepositories;

  @SpringBootApplication
  @Configuration
  @EnableCaching

  public class PdrmApplication {

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

Answer 1

此错误可能有多种原因。就像缺少或错误的组件 -scan 标签...

能否请您也分享一下您的 spring 配置文件。

Answer 2

我通过为每一层创建包解决了这个问题。

• com.example.model
• com.example.repository
• com.example.controller
• com.example.configuration