springboot搭建微服务
修改application.properties。
·
目录
1、首先建一个springboot项目(idea)
不用选择任何依赖直接next
1.1、修改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 https://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> #版本管理需修改为pom打包 <packaging>pom</packaging> #子模块 <modules> <module>qy151-gzh-springcloud-order</module> <module>qy151-gzh-springcloud-common</module> <module>qy151-gzh-springcloud-goods</module> </modules> <parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version>2.3.12.RELEASE</version> <relativePath/> </parent> <groupId>com.gzh</groupId> <artifactId>myspringcloud</artifactId> <version>0.0.1-SNAPSHOT</version> #版本管理 <properties> <project.bulid.sourceEncoding>UTF-8</project.bulid.sourceEncoding> <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding> <spring-cloud.version>Hoxton.SR8</spring-cloud.version> <spring-cloud-alibaba.version>2.2.3.RELEASE</spring-cloud-alibaba.version> <java.version>1.8</java.version> </properties> <dependencyManagement> <dependencies> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-dependencies</artifactId> <version>${spring-cloud.version}</version> <type>pom</type> <scope>import</scope> </dependency> <dependency> <groupId>com.alibaba.cloud</groupId> <artifactId>spring-cloud-alibaba-dependencies</artifactId> <version>${spring-cloud-alibaba.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、新增公共子模块
选择以maven项目创建即可
2.1、添加依赖
其他子模块可以共用公共模块的依赖不需再添加依赖了
<dependencies> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <version>8.0.20</version> </dependency> #数据库驱动 <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-jdbc</artifactId> </dependency> <dependency> <groupId>com.fasterxml.jackson.core</groupId> <artifactId>jackson-databind</artifactId> <version>2.13.3</version> </dependency> <dependency> <groupId>org.projectlombok</groupId> <artifactId>lombok</artifactId> <version>1.18.24</version> </dependency> <!--mybatis-plus 生成器--> <dependency> <groupId>com.baomidou</groupId> <artifactId>mybatis-plus-generator</artifactId> <version>3.5.2</version> </dependency> <dependency> <groupId>org.freemarker</groupId> <artifactId>freemarker</artifactId> <version>2.3.31</version> </dependency> <dependency> <groupId>com.baomidou</groupId> <artifactId>mybatis-plus-boot-starter</artifactId> <version>3.5.2</version> </dependency> #数据库连接池 <dependency> <groupId>com.alibaba</groupId> <artifactId>druid-spring-boot-starter</artifactId> <version>1.2.11</version> </dependency> </dependencies>
2.2、建立一些公共对象
CommonResult
@Data @AllArgsConstructor @NoArgsConstructor public class CommonResult { private Integer status; //200成功 201失败 private String msg; //提示信息 private Object data; //服务器返回值数据 public static CommonResult fail(){ return new CommonResult(201,"业务调用失败!!",null); } public static CommonResult fail(int code, String msg){ return new CommonResult(code, msg, null); } public static CommonResult success(){ return new CommonResult(200,"业务调用成功!!",null); } public static CommonResult success(Object data){ return new CommonResult(200,"业务调用成功!!",data); } public static CommonResult success(String msg, Object data){ return new CommonResult(200,msg,data); } }
ShopOrder
@Data @Builder @TableName("shop_order") public class ShopOrder implements Serializable { private static final long serialVersionUID = 1L; /** * 订单id */ @TableId(value = "oid", type = IdType.ASSIGN_ID) private Long oid; /** * 用户id */ private Integer uid; /** * 用户名 */ private String username; /** * 商品id */ private Long pid; /** * 商品名称 */ private String pname; /** * 商品价格 */ private BigDecimal pprice; /** * 购买数量 */ private Integer number; }
ShopProduct
@Data @Builder @AllArgsConstructor @NoArgsConstructor @TableName("shop_product") public class ShopProduct implements Serializable { private static final long serialVersionUID = 1L; /** * 商品id */ @TableId(value = "pid", type = IdType.AUTO) private Long pid; /** * 商品名 */ private String pname; /** * 商品价格 */ private BigDecimal pprice; /** * 商品库存 */ private String stock; }
3、建立商品模块
3.1、修改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"> <parent> <artifactId>myspringcloud</artifactId> <groupId>com.gzh</groupId> <version>0.0.1-SNAPSHOT</version> </parent> <modelVersion>4.0.0</modelVersion> <artifactId>qy151-gzh-springcloud-goods</artifactId> <dependencies> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> #引用common模块 <dependency> <groupId>com.gzh</groupId> <artifactId>qy151-gzh-springcloud-common</artifactId> <version>0.0.1-SNAPSHOT</version> </dependency> </dependencies> </project>
3.2、 配置数据源
#服务端口号 server.port=8082 spring.datasource.druid.driver-class-name=com.mysql.cj.jdbc.Driver spring.datasource.druid.url=jdbc:mysql://localhost:3306/mydb?serverTimezone=Asia/Shanghai&characterEncoding=utf-8 spring.datasource.druid.username= spring.datasource.druid.password= #启动mysql日志 mybatis-plus.configuration.log-impl=org.apache.ibatis.logging.stdout.StdOutImpl
3.3、基本操作单表的类
IShopProductService
public interface IShopProductService extends IService<ShopProduct> { }
ShopProductServiceImpl
@Service public class ShopProductServiceImpl extends ServiceImpl<ShopProductMapper, ShopProduct> implements IShopProductService { }
ShopProductMapper
public interface ShopProductMapper extends BaseMapper<ShopProduct> { }
ShopProductController
@RestController @RequestMapping("/good") public class ShopProductController { @Autowired IShopProductService iShopProductService; @GetMapping("/selectone/{gid}") public CommonResult selectOne(@PathVariable String gid){ ShopProduct shopProduct = iShopProductService.getById(gid); return shopProduct != null ? CommonResult.success("success", shopProduct) : CommonResult.success("没有这条数据", null); } }
3.4、设置主启动类
@SpringBootApplication @MapperScan(basePackages = "com.gzh.mapper")//设置持久层扫描 public class SpringGoodApplication { public static void main(String[] args) { org.springframework.boot.SpringApplication.run(SpringGoodApplication.class, args); } }
4、建立订单模块
4.1、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"> <parent> <artifactId>myspringcloud</artifactId> <groupId>com.gzh</groupId> <version>0.0.1-SNAPSHOT</version> </parent> <modelVersion>4.0.0</modelVersion> <artifactId>qy151-gzh-springcloud-order</artifactId> <dependencies> <dependency> <groupId>com.gzh</groupId> <artifactId>qy151-gzh-springcloud-common</artifactId> <version>0.0.1-SNAPSHOT</version> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> </dependencies> </project>
4.2、设置数据源
与上面一致
4.3、设置启动类
@SpringBootApplication @MapperScan(basePackages = "com.gzh.mapper") public class SpringOrderApplication { public static void main(String[] args) { org.springframework.boot.SpringApplication.run(SpringOrderApplication.class, args); } @Bean//spring提供模块之间通信的类 需要手动注入 public RestTemplate restTemplate(){ return new RestTemplate(); } }
4.4、简单调用商品模块的接口进行下单
其他的mapper,service....与上面一样继承BaseMapper即可
@RestController @RequestMapping("/order") public class ShopOrderController { @Autowired RestTemplate restTemplate; @Autowired IShopOrderService shopOrderService; @PostMapping("/{gid}/{count}") @LoadBalanced public CommonResult pay(@PathVariable String gid,@PathVariable Integer count){ CommonResult commonResult = restTemplate.getForObject("http://localhost:8081/good/selectone/"+gid, CommonResult.class); //jackson包下的一个将object对象转为相应的java对象 ShopProduct shopProduct = new ObjectMapper().convertValue(commonResult.getData(), ShopProduct.class); ShopOrder order = ShopOrder.builder().pname(shopProduct.getPname()) .pprice(shopProduct.getPprice()) .username("wd") .pid(shopProduct.getPid()) .number(count) .uid(1).build(); //存入数据库中 boolean save = shopOrderService.save(order); return save ? CommonResult.success("添加成功", null) : CommonResult.success("添加失败", null); } }
这样就完成了基本的微服务架构
5、添加注册中心
5.1、nacos
1、添加依赖
<dependency> <groupId>com.alibaba.cloud</groupId> <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId> </dependency>
2、下载nacos服务器
Nacos官方文档:Nacos 快速开始
Nacos下载地址:Releases · alibaba/nacos · GitHub
编辑startup.sh,将MODE修改为standalone改为单机模式启动
然后访问http://localhost:8848/nacos/
默认帐号nacos 密码nacos
3、注册服务
编辑order模块的application.properties 新增属性
spring.cloud.nacos.server-addr=localhost:8848#nacos地址 spring.cloud.nacos.discovery.service=springcloud-order#注册服务名
可以看到已经注册到nacos中了
5.2、eureka
1、单独建立一个eureka模块作为启动eureka服务的服务器
2、pom.xml
<dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-netflix-eureka-server</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency>
3、修该application.properties
server.port=7000 eureka.instance.hostname=localhost #是否注册自己 eureka.client.register-with-eureka=false eureka.client.fetch-registry=false #eureka访问地址 eureka.client.service-url.defaultZone=http://localhost:7001/eureka/
4、创建主启动类
@SpringBootApplication @EnableEurekaServer//开启eureka服务 public class EurekaApp { public static void main(String[] args) { SpringApplication.run(EurekaApp.class, args); } }
5、配置客户端
添加依赖
<dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId> </dependency>
修改application.properties
#设置服务名 eureka.instance.appname=order eureka.client.service-url.defaultZone=http://localhost:7000/eureka/
6、启动
6、负载均衡
使用其内置的ribbon做负载均衡
在主启动类上加@EnableEurekaClient注解开启
@SpringBootApplication @MapperScan(basePackages = "com.gzh.mapper") @EnableEurekaClient public class SpringOrderApplication { public static void main(String[] args) { org.springframework.boot.SpringApplication.run(SpringOrderApplication.class, args); } @Bean @LoadBalanced public RestTemplate restTemplate(){ return new RestTemplate(); } }
使用负载均衡
@RestController @RequestMapping("/order") public class ShopOrderController { @Autowired RestTemplate restTemplate; @Autowired IShopOrderService shopOrderService; @Autowired DiscoveryClient discoveryClient; @PostMapping("/{gid}/{count}") public CommonResult pay(@PathVariable String gid,@PathVariable Integer count){ //会查询所有这个名字下服务 并进行轮询访问 CommonResult commonResult = restTemplate.getForObject("http://设置服务名/good/selectone/"+gid, CommonResult.class); ShopProduct shopProduct = new ObjectMapper().convertValue(commonResult.getData(), ShopProduct.class); ShopOrder order = ShopOrder.builder().pname(shopProduct.getPname()) .pprice(shopProduct.getPprice()) .username("wd") .pid(shopProduct.getPid()) .number(count) .uid(1).build(); boolean save = shopOrderService.save(order); return save ? CommonResult.success("添加成功", null) : CommonResult.success("添加失败", null); } }
自定义策略
#修改application.properties
springcloud-order.ribbon.NFLoadBalancerRuleClassName=com.netflix.loadbalancer.RandomRule
- 随机 (RandomRule)
- 轮询 (RoundRobinRule)
- 加权(WeightedResponseTimeRule)
- .........
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