我有一个使用H2作为数据库的项目，我正在尝试在UserDAO上对其上的所有用户进行查询，但是当我尝试运行终端时会出现很多错误，并且无法启动服务器，但是当我注释查询行时，程序正常运行。
org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'loginController': Unsatisfied dependency expressed through field 'usuarioService'; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'usuarioService' defined in file [/home/gustavolbs/PSOFT/back-end/lab3/target/classes/com/lab2/crud/service/UsuarioService.class]: Unsatisfied dependency expressed through constructor parameter 0; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'userDAO': Invocation of init method failed; nested exception is java.lang.IllegalStateException: Using named parameters for method public abstract com.lab2.crud.model.User com.lab2.crud.dao.UserDAO.findByLogin(java.lang.String) but parameter 'Optional[searchLogin]' not found in annotated query 'Select u from User u where u.login=:plogin'!
<?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 http://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>2.1.5.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<groupId>com.lab2</groupId>
<artifactId>crud</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>crud</name>
<description>Demo project for Spring Boot</description>
<properties>
<java.version>1.8</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>org.springframework.boot</groupId>
<artifactId>spring-boot-devtools</artifactId>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>com.h2database</groupId>
<artifactId>h2</artifactId>
<scope>runtime</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-thymeleaf</artifactId>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<version>1.18.4</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>io.jsonwebtoken</groupId>
<artifactId>jjwt</artifactId>
<version>0.9.0</version>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
package com.lab2.crud.controller;
import java.util.Date;
import javax.servlet.ServletException;
import com.lab2.crud.model.User;
import com.lab2.crud.service.UsuarioService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import io.jsonwebtoken.Jwts;
import io.jsonwebtoken.SignatureAlgorithm;
@RestController
@RequestMapping("/v1/auth")
public class LoginController {
private final String TOKEN_KEY = "banana";
@Autowired
private UsuarioService usuarioService;
@PostMapping("/login")
public LoginResponse authenticate(@RequestBody User usuario) throws ServletException {
// Recupera o usuario
User authUsuario = usuarioService.findByLogin(usuario.getLogin());
// verificacoes
if(authUsuario == null) {
throw new ServletException("Usuario nao encontrado!");
}
if(!authUsuario.getPassword().equals(usuario.getPassword())) {
throw new ServletException("Senha invalida!");
}
String token = Jwts.builder().
setSubject(authUsuario.getLogin()).
signWith(SignatureAlgorithm.HS512, TOKEN_KEY).
setExpiration(new Date(System.currentTimeMillis() + 1 * 60 * 1000))
.compact();
return new LoginResponse(token);
}
private class LoginResponse {
public String token;
public LoginResponse(String token) {
this.token = token;
}
}
}
package com.lab2.crud.controller;
import com.lab2.crud.model.User;
import com.lab2.crud.service.UsuarioService;
import com.lab2.exception.Usuario.UsuarioJaExisteException;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.HttpStatus;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
@RestController
@RequestMapping("/v1/usuarios")
public class UsuarioController {
@Autowired
private UsuarioService usuarioService;
UsuarioController(UsuarioService usuarioService) {
this.usuarioService = usuarioService;
}
@PostMapping(value="/")
public ResponseEntity<User> create(@RequestBody User usuario) {
if (usuarioService.findByLogin(usuario.getLogin()) != null) {
throw new UsuarioJaExisteException("Usuário já existe");
}
User newUser = usuarioService.create(usuario);
if (newUser == null) {
throw new InternalError("Something went wrong");
}
return new ResponseEntity<User>(newUser, HttpStatus.CREATED);
}
}
当我在UserDAO上注释查询行时，程序将运行，但不会搜索登录名。
package com.lab2.crud.dao;
import java.io.Serializable;
import java.util.List;
import com.lab2.crud.model.User;
import org.springframework.data.jpa.repository.JpaRepository;
import org.springframework.data.jpa.repository.Query;
import org.springframework.data.repository.query.Param;
import org.springframework.stereotype.Repository;
@Repository
public interface UserDAO<T, ID extends Serializable> extends JpaRepository<User, String> {
User save(User usuario);
User findById(long id);
@Query("Select u from User u where u.login=:plogin")
User findByLogin(@Param("searchLogin") String login);
List<User> findAll();
}
package com.lab2.crud.model;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import lombok.Data;
@Data
@Entity
public class User {
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
private long id;
private String name;
private String login;
private String password;
public User() {
}
public long getId() {
return id;
}
public String getName() {
return name;
}
public String getLogin() {
return login;
}
public String getPassword() {
return password;
}
public User(String name, String login, String password) {
this.name = name;
this.login = login;
this.password = password;
}
}
server.port = 8080
# H2
spring.h2.console.enabled=true
spring.h2.console.path=/h2
#indicará o path para você acessar a interface do h2, em geral, vá ao browser e coloque localhost:8080/h2 com 8080 ou sua porta
# Datasource
spring.datasource.url=jdbc:h2:file:~/PSOFT/back-end/lab3/test
spring.datasource.username=sa
spring.datasource.password=
spring.datasource.driver-class-name=org.h2.Driver
spring.jpa.hibernate.ddl-auto=update
server.servlet.context-path=/api
#diz ao spring que coloque /api antes de qualquer url, ou seja, se voce quiser utilizar as rotas /products, precisará adicionar /api => /api/v1/products e assim por diante
我试图以其他方式重写查询，尝试重新导入包，在另一台机器上运行，但是没有任何效果，我不知道解决什么以及为什么解决。有人可以帮我吗？
答案 0 :(得分：2)
在DAO中
upload.emit("finish"); // must emit after subscribing
您已将searchLogin声明为带有@Param批注的参数，但在查询中已将plogin用作参数。如下所示，在查询中将plogin替换为searchLogin，
@Query("Select u from User u where u.login=:plogin")
User findByLogin(@Param("searchLogin") String login);