SpringCloud（第 038 篇）idea环境热部署微服务开发
一、大致介绍
1、我们在开发过程中，会经常需要启动、停止微服务，而且有时候会比较频繁，需要不停的操作启停动作；
2、而我们本章节主要讲解下如何在开发环境中进行热部署，这样的话可以在一定程度上专心敲代码，两耳不闻窗外事，一心只想敲代码；
二、实现步骤
2.1 添加 maven 引用包
<?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>
<artifactId>springms-simple-provider-user-devtools</artifactId>
<version>1.0-SNAPSHOT</version>
<packaging>jar</packaging>
<parent>
<groupId>com.springms.cloud</groupId>
<artifactId>springms-spring-cloud</artifactId>
<version>1.0-SNAPSHOT</version>
</parent>
<dependencies>
<!-- 访问数据库模块 -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
<!-- web模块 -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<!-- h2数据库模块 -->
<dependency>
<groupId>com.h2database</groupId>
<artifactId>h2</artifactId>
<scope>runtime</scope>
</dependency>
<!-- 支持Apache Solr搜索平台，包括spring-data-solr -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-solr</artifactId>
</dependency>
<!-- 热部署模块 -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-devtools</artifactId>
<optional>true</optional>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
<configuration>
<fork>true</fork>
</configuration>
</plugin>
</plugins>
</build>
</project>
2.2 添加应用配置文件（springms-simple-provider-user-devtools\src\main\resources\application.yml）
server:
port: 8305
spring:
application:
name: springms-simple-provider-user-devtools #全部小写
jpa:
generate-ddl: false
show-sql: true
hibernate:
ddl-auto: none
datasource:
platform: h2
schema: classpath:schema.sql
data: classpath:data.sql
thymeleaf:
cache: false
logging:
level:
root: INFO
org.hibernate: INFO
org.hibernate.type.descriptor.sql.BasicBinder: TRACE
org.hibernate.type.descriptor.sql.BasicExtractor: TRACE
com.springms: DEBUG
2.3 添加 H2 数据库脚本（springms-simple-provider-user-devtools\src\main\resources\schema.sql）
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)
);
2.4 插入 H2 数据库一些初始化数据（springms-simple-provider-user-devtools\src\main\resources\data.sql）
INSERT into user (id, username, name, age, balance) values (1, 'user1', '张三', 20, 100.00);
INSERT into user (id, username, name, age, balance) values (2, 'user2', '李四', 22, 100.00);
INSERT into user (id, username, name, age, balance) values (3, 'user3', '王五', 24, 100.00);
INSERT into user (id, username, name, age, balance) values (4, 'user4', '赵六', 26, 100.00);
INSERT into user (id, username, name, age, balance) values (5, 'user5', '李逵', 27, 100.00);
INSERT into user (id, username, name, age, balance) values (6, 'user6', '张远', 10, 100.00);
INSERT into user (id, username, name, age, balance) values (7, 'user7', '迪拜', 60, 100.00);
INSERT into user (id, username, name, age, balance) values (8, 'user8', '哈士奇', 40, 100.00);
INSERT into user (id, username, name, age, balance) values (9, 'user9', '关羽', 30, 100.00);
2.5 添加访问底层数据模型的DAO接口（springms-simple-provider-user-devtools\src\main\java\com\springms\cloud\repository\UserRepository.java）
package com.springms.cloud.repository;
import com.springms.cloud.entity.User;
import org.springframework.data.jpa.repository.JpaRepository;
import org.springframework.stereotype.Repository;
@Repository
public interface UserRepository extends JpaRepository<User, Long> {
}
2.6 添加实体用户类User（springms-simple-provider-user-devtools\src\main\java\com\springms\cloud\entity\User.java）
package com.springms.cloud.entity;
import java.math.BigDecimal;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
@Entity
public class User {
@Id
@GeneratedValue(strategy = GenerationType.AUTO)
private Long id;
@Column
private String username;
@Column
private String name;
@Column
private Short age;
@Column
private BigDecimal balance;
public Long getId() {
return this.id;
}
public void setId(Long id) {
this.id = id;
}
public String getUsername() {
return this.username;
}
public void setUsername(String username) {
this.username = username;
}
public String getName() {
return this.name;
}
public void setName(String name) {
this.name = name;
}
public Short getAge() {
return this.age;
}
public void setAge(Short age) {
this.age = age;
}
public BigDecimal getBalance() {
return this.balance;
}
public void setBalance(BigDecimal balance) {
this.balance = balance;
}
}
2.7 添加用户Web访问层Controller（springms-simple-provider-user-devtools/src/main/java/com/springms/cloud/controller/SimpleProviderUserDevtoolsController.java）
package com.springms.cloud.controller;
import com.springms.cloud.entity.User;
import com.springms.cloud.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;
/**
* 用户微服务Controller（支持 idea 热部署）。
*
* @author hmilyylimh
*
* @version 0.0.1
*
* @date 17/10/18
*
*/
@RestController
public class SimpleProviderUserDevtoolsController {
@Autowired
private UserRepository userRepository;
@GetMapping("/simple/{id}")
public User findById(@PathVariable Long id) {
return this.userRepository.findOne(id);
}
@GetMapping("simple")
public String simple() {
return "simple-2017-09";
}
@GetMapping("simple2")
public String simple2() {
return "simple2-2017";
}
}
2.8 添加简单用户微服务启动类（springms-simple-provider-user-devtools\src\main\java\com\springms\cloud\MsSimpleProviderUserApplication.java）
package com.springms.cloud;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
/**
* 简单用户微服务类（支持 idea 热部署）。
*
* @author hmilyylimh
*
* @version 0.0.1
*
* @date 17/10/18
*
*/
@SpringBootApplication
public class MsSimpleProviderUserDevtoolsApplication {
public static void main(String[] args) {
SpringApplication.run(MsSimpleProviderUserDevtoolsApplication.class, args);
System.out.println("【【【【【【 简单用户微服务（热部署） 】】】】】】已启动.");
}
}
三、测试
/****************************************************************************************
一、简单用户微服务接口测试：
1、添加 spring-boot-devtools 热部署依赖；
2、pom.xml 添加 <fork>true</fork> 属性；
3、设置 idea 属性：“File” -> “Settings” -> “Build,Execution,Deplyment” -> “Compiler”，选中打勾 “Build project automatically” ；
4、设置 idea 属性：组合键：“Shift+Ctrl+Alt+/” ，选择 “Registry” ，选中打勾 “compiler.automake.allow.when.app.running” ；
5、设置缓存配置 spring.thymeleaf.cache=false；
6、设置 chrome 属性：F12或者“Ctrl+Shift+I”，打开开发者工具，“Network” 选项卡下 选中打勾 “Disable Cache(while DevTools is open)” ；
7、启动 springms-simple-provider-user-devtools 模块服务，启动1个端口；
8、在浏览器输入地址 http://localhost:8305/simple 可以看到信息成功的被打印出来；
9、改动 Controller 某个方法的返回值，或者新增方法，然后会看到控制台自动重启该应用，进行热部署；
10、再在浏览器请求刚刚改动的链接，发现链接返回的内容确实动态改变过来了，这就是热部署；
****************************************************************************************/
四、下载地址
https://gitee.com/ylimhhmily/SpringCloudTutorial.git
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