我正在尝试启动一个简单的程序,它是一个学生系统。 这些是我的包裹:
Controle.java类:
package br.com.systemvidenci.systemvidenci.controle;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RestController;
import br.com.systemvidenci.systemvidenci.modelo.Estudante;
@RestController
public class Controle {
@GetMapping("")
public String mensagem(){
return "Hello World!";
}
@GetMapping("/boasVindas")
public String boasVindas(){
return "Seja bem vindo(a)";
}
@GetMapping("/boasVindas/{nome}")
public String boasVindas(@PathVariable String nome){
return "Seja bem vindo(a), " + nome;
}
@PostMapping("/estudante")
public Estudante estudante(@RequestBody Estudante e){
return e;
}
}
Estudante.java 类:
package br.com.systemvidenci.systemvidenci.modelo;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.Table;
@Entity
@Table(name="estudantes")
public class Estudante {
@Id
@GeneratedValue(strategy= GenerationType.IDENTITY)
private int codigo;
public int getCodigo() {
return codigo;
}
public void setCodigo(int codigo) {
this.codigo = codigo;
}
private String nome;
private int idade;
public String getNome() {
return nome;
}
public void setNome(String nome) {
this.nome = nome;
}
public int getIdade() {
return idade;
}
public void setIdade(int idade) {
this.idade = idade;
}
}
Systemvidenci应用类:
package br.com.systemvidenci.systemvidenci;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
@SpringBootApplication
public class SystemvidenciApplication {
public static void main(String[] args) {
SpringApplication.run(SystemvidenciApplication.class, args);
}
}
pom.xml文件:
<?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>2.7.10</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<groupId>br.com.systemvidenci</groupId>
<artifactId>systemvidenci</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>systemvidenci</name>
<description>Demo project for Spring Boot</description>
<properties>
<java.version>11</java.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
<version>3.0.5</version>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>8.0.32</version>
</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>
<optional>true</optional>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
Application.properties文件:
spring.jpa.hibernate.ddl-auto=update
# Acesso ao banco de dados
spring.datasource.url=jdbc:mysql://${MYSQL_HOST:localhost}:3306/estudantes
# Usuário do banco de dados
spring.datasource.username=root
# Senha do banco de dados
spring.datasource.password=99560405
但是当我启动这个程序时,出现以下错误:
应用程序启动失败
描述:
无法配置数据源:未指定“url”属性,无法配置嵌入式数据源。
原因:未能确定合适的司机类别
动作:
考虑以下因素: 如果您想要嵌入式数据库(H2、HSQL 或 Derby),请将其放在类路径中。 如果您有要从特定配置文件加载的数据库设置,您可能需要激活它(当前没有任何配置文件处于活动状态)。
有人知道怎么解决吗?我想学习这些基础知识,然后在我的系统上实现更好的配置,但我现在遇到了这个麻烦......
我试图将应用程序属性“spring.datasource.url=jdbc:mysql://${MYSQL_HOST:localhost}:3306/estudantes”更改为 spring.datasource.url=jdbc:mysql://localhost:3306/estudantes
什么也没有发生。我知道如何验证我的数据库是否处于活动状态,如果不是,我该如何解决...
您可以尝试添加
spring.datasource.driver-class-name=com.mysql.jdbc.Driver
到你的
application.properties
文件