Java docker compose无法连接到postgresql

应用程序属性

spring.datasource.url=jdbc:postgresql://db:5432/test
spring.datasource.username=postgres
spring.datasource.password=123
spring.jpa.properties.hibernate.dialect=org.hibernate.dialect.PostgreSQL9Dialect
spring.jpa.hibernate.ddl-auto=create
spring.jpa.properties.hibernate.format_sql=true
spring.jpa.properties.hibernate.id.new_generator_mappings=true
server.port=8000

docker compose

version: '3.7'
services:

  db:
    image: postgres:11.4
    ports:
      - "5432:5432"
    expose:
      - 5432
    environment:
      POSTGRES_PASSWORD: "root"
      POSTGRES_DB: test

  lady:
    depends_on:
      - db
    build: ./test/
    ports:
      - "8000:8000"
    expose:
      - 8000
    environment:
      DB_USER: "postgres"
      DB_PASSWORD: "123"
      DB_TYPE: "postgres"
    command: ["java","-jar","test.jar"]

记录错误

com.women.lady.LadyApplicationTests > contextLoads() FAILED
    java.lang.IllegalStateException
        Caused by: org.springframework.beans.factory.BeanCreationException
            Caused by: javax.persistence.PersistenceException
                Caused by: org.hibernate.exception.JDBCConnectionException
                    Caused by: org.postgresql.util.PSQLException
                        Caused by: java.net.UnknownHostException

运行docker compose时无法连接到postgres或db:docker compose up

问题

如何连接docker compose上的数据库。

---

请给我举个例子

首先，你能添加docker postgrs日志吗？还可以添加到您的yml文件中的

lady:

db\u host

db\u host:db

，如果您不告诉容器主机，容器如何知道要连接到哪个db容器？db是否正确启动？你提供zur Liga吗？我已经在

lady:

下添加了DB_HOST:DB，但仍然是error.log error>Task:test com.women.lady.LadyApplicationTests>contextLoads（）失败的java.lang.IllegalStateException由以下原因引起：org.springframework.beans.factory.BeanCreationException由以下原因引起：javax.persistence.PersistenceException由以下原因引起：org.hibernate.exception.JDBCConnectionException由以下原因引起：org.postgresql.util.psqlexeption原因：java.net.UnknownHostException 1测试已完成，1失败：生成失败并出现异常。>任务：测试失败