SpringCloud（第 038 篇）idea環境熱部署微服務開發
一、大致介紹
1、我們在開發過程中，會經常需要啟動、停止微服務，而且有時候會比較頻繁，需要不停的操作啟停動作；
2、而我們本章節主要講解下如何在開發環境中進行熱部署，這樣的話可以在一定程度上專心敲代碼，兩耳不聞窗外事，一心只想敲代碼；
二、實現步驟
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>
<!-- 訪問數據庫模塊 -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
<!-- web模塊 -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<!-- h2數據庫模塊 -->
<dependency>
<groupId>com.h2database</groupId>
<artifactId>h2</artifactId>
<scope>runtime</scope>
</dependency>
<!-- 支持Apache Solr搜索平臺，包括spring-data-solr -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-solr</artifactId>
</dependency>
<!-- 熱部署模塊 -->
<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 添加應用配置文件（springms-simple-provider-user-devtools\src\main\resources\application.yml）
server:
port: 8305
spring:
application:
name: springms-simple-provider-user-devtools #全部小寫
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 數據庫腳本（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 數據庫一些初始化數據（springms-simple-provider-user-devtools\src\main\resources\data.sql）
INSERT into user (id, username, name, age, balance) values (1, 'user1', '張三', 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', '趙六', 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', '張遠', 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', '關羽', 30, 100.00);
2.5 添加訪問底層數據模型的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 添加實體用戶類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 添加用戶Web訪問層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;
/**
* 用戶微服務Controller（支持 idea 熱部署）。
*
* @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 添加簡單用戶微服務啟動類（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;
/**
* 簡單用戶微服務類（支持 idea 熱部署）。
*
* @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("【【【【【【 簡單用戶微服務（熱部署） 】】】】】】已啟動.");
}
}
三、測試
/****************************************************************************************
一、簡單用戶微服務接口測試：
1、添加 spring-boot-devtools 熱部署依賴；
2、pom.xml 添加 <fork>true</fork> 屬性；
3、設置 idea 屬性：“File” -> “Settings” -> “Build,Execution,Deplyment” -> “Compiler”，選中打勾 “Build project automatically” ；
4、設置 idea 屬性：組合鍵：“Shift+Ctrl+Alt+/” ，選擇 “Registry” ，選中打勾 “compiler.automake.allow.when.app.running” ；
5、設置緩存配置 spring.thymeleaf.cache=false；
6、設置 chrome 屬性：F12或者“Ctrl+Shift+I”，打開開發者工具，“Network” 選項卡下 選中打勾 “Disable Cache(while DevTools is open)” ；
7、啟動 springms-simple-provider-user-devtools 模塊服務，啟動1個端口；
8、在瀏覽器輸入地址 http://localhost:8305/simple 可以看到信息成功的被打印出來；
9、改動 Controller 某個方法的返回值，或者新增方法，然后會看到控制臺自動重啟該應用，進行熱部署；
10、再在瀏覽器請求剛剛改動的鏈接，發現鏈接返回的內容確實動態改變過來了，這就是熱部署；
****************************************************************************************/
四、下載地址
https://gitee.com/ylimhhmily/SpringCloudTutorial.git
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