第四章 SpringCloud之Eureka-Client实现服务(Jpa，H2)

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1、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 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>2.1.3.RELEASE</version>

        <relativePath/> <!-- lookup parent from repository -->

    </parent>

    <groupId>com.test</groupId>

    <artifactId>eureka-client-user</artifactId>

    <version>0.0.1-SNAPSHOT</version>

    <name>eureka-client-user</name>

    <description>Demo project for Spring Boot</description>

    <properties>

        <java.version>1.8</java.version>

        <spring-cloud.version>Greenwich.SR1</spring-cloud.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.cloud</groupId>

            <artifactId>spring-cloud-starter-netflix-eureka-server</artifactId>

        </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>

    </dependencies>

    <dependencyManagement>

        <dependencies>

            <dependency>

                <groupId>org.springframework.cloud</groupId>

                <artifactId>spring-cloud-dependencies</artifactId>

                <version>${spring-cloud.version}</version>

                <type>pom</type>

                <scope>import</scope>

            </dependency>

        </dependencies>

    </dependencyManagement>

    <build>

        <plugins>

            <plugin>

                <groupId>org.springframework.boot</groupId>

                <artifactId>spring-boot-maven-plugin</artifactId>

            </plugin>

        </plugins>

    </build>

</project>

2、在application.yml文件中添加配置

spring:

  application:

    name: eureka-client-user  #应用名

  jpa:

    generate-ddl: false

    show-sql: true   #jpa显示sql语句

    hibernate:

      ddl-auto: none

  datasource:

    platform: h2   #数据库使用H2模拟

    schema: classpath:schema.sql  #sql语句配置

    data: classpath:data.sql  #数据配置

logging:  #logging日志配置

  level:

    root: INFO

    org.hibernate: INFO

server:

  port: 8663   #服务端口

eureka:

  instance:

    hostname: localhost

    prefer-ip-address: true

    instance-id: ${spring.application.name}:${spring.application.instance_id:${server.port}}

  client:

    serviceUrl:

      defaultZone: http://${eureka.instance.hostname}:8661/eureka

3、在启动类添加注解

package com.test.eurekaclientuser;

import org.springframework.boot.SpringApplication;

import org.springframework.boot.autoconfigure.SpringBootApplication;

import org.springframework.cloud.netflix.eureka.EnableEurekaClient;

@SpringBootApplication

@EnableEurekaClient

public class EurekaClientUserApplication {

    public static void main(String[] args) {

        SpringApplication.run(EurekaClientUserApplication.class, args);

    }

}

4、添加data.sql和schema.sql

#schema.sql文件内容

drop table user if exists ;

create  table user (id bigint generated by default as identity ,username varchar(40),name varchar(20),age int(3),balance decimal(10,2),primary key(id))

#data.sql文件内容

insert into user (id,username,name,age,balance) values(1,'user1','zhangsan',20,100.00);

insert into user (id,username,name,age,balance) values(2,'user2','zhangsan',20,100.00);

insert into user (id,username,name,age,balance) values(3,'user3','zhangsan',20,100.00);

insert into user (id,username,name,age,balance) values(4,'user4','zhangsan',20,100.00);

insert into user (id,username,name,age,balance) values(5,'user5','zhangsan',20,100.00);

5、User.java类

package com.test.eurekaclientuser.entity;

import com.fasterxml.jackson.annotation.JsonIgnoreProperties;

import javax.persistence.*;

import java.io.Serializable;

import java.math.BigDecimal;

//Jpa的注解配置

@Entity

@JsonIgnoreProperties(value = { "hibernateLazyInitializer", "handler" })

public class User implements Serializable {

    @Id

    @GeneratedValue(strategy = GenerationType.AUTO)

    private  Long id;

    @Column

    private  String name;

    @Column

    private  String username;

    @Column

    private  BigDecimal balance;

    @Column

    private  short age;

    public Long getId() {

        return id;

    }

    public void setId(Long id) {

        this.id = id;

    }

    public String getName() {

        return name;

    }

    public void setName(String name) {

        this.name = name;

    }

    public String getUsername() {

        return username;

    }

    public void setUsername(String username) {

        this.username = username;

    }

    public BigDecimal getBalance() {

        return balance;

    }

    public void setBalance(BigDecimal balance) {

        this.balance = balance;

    }

    public short getAge() {

        return age;

    }

    public void setAge(short age) {

        this.age = age;

    }

}

6、UserRepository.java类

package com.test.eurekaclientuser.repository;

import com.test.eurekaclientuser.entity.User;

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

#继承Jpa的类

public interface UserRepository extends JpaRepository<User,Long> {

}

7、UserController.java类

package com.test.eurekaclientuser.controller;

import com.test.eurekaclientuser.entity.User;

import com.test.eurekaclientuser.repository.UserRepository;

import org.springframework.beans.factory.annotation.Autowired;

import org.springframework.web.bind.annotation.GetMapping;

import org.springframework.web.bind.annotation.PathVariable;

import org.springframework.web.bind.annotation.RestController;

@RestController

public class UserController {

    @Autowired

    private UserRepository userRepository;

  /*  @Autowired

    private EurekaClient discoveryClient;*/

    @GetMapping("/user/{id}")

    public User findById(@PathVariable  Long id){

        System.out.println(id);

        return this.userRepository.getOne(id);

    }

   /* @GetMapping("/eureka/url")

    public String serviceUrl() {

        InstanceInfo instance = discoveryClient.getNextServerFromEureka("client1", false);

        return instance.getHomePageUrl();

    }*/

}