尚硅谷2020最新版周阳SpringCloud(H版&alibaba)框架开发教程 学习笔记(一)
学习地址：https://www.bilibili.com/video/av94137107?p=1
新建maven聚合工程
Maven父工程，pom.xml记录
<?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>
<groupId>org.xzq.springcloud</groupId>
<artifactId>cloud2020</artifactId>
<version>1.0-SNAPSHOT</version>
<packaging>pom</packaging>
<!--统一管理jar包和版本-->
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<maven.compiler.source>1.8</maven.compiler.source>
<maven.compiler.target>1.8</maven.compiler.target>
<junit.version>4.12</junit.version>
<log4j.version>1.2.17</log4j.version>
<lombok.version>1.16.18</lombok.version>
<mysql.version>5.1.47</mysql.version>
<druid.verison>1.1.16</druid.verison>
<mybatis.spring.boot.verison>1.3.0</mybatis.spring.boot.verison>
</properties>
<dependencyManagement>
<dependencies>
<!--spring boot 2.2.2-->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-dependencies</artifactId>
<version>2.2.2.RELEASE</version>
<type>pom</type>
<scope>import</scope>
</dependency>
<!--spring cloud Hoxton.SR1-->
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-dependencies</artifactId>
<version>Hoxton.SR1</version>
<type>pom</type>
<scope>import</scope>
</dependency>
<!--spring cloud alibaba 2.1.0.RELEASE-->
<dependency>
<groupId>com.alibaba.cloud</groupId>
<artifactId>spring-cloud-alibaba-dependencies</artifactId>
<version>2.2.0.RELEASE</version>
<type>pom</type>
<scope>import</scope>
</dependency>
<!-- MySql -->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>${mysql.version}</version>
</dependency>
<!-- Druid -->
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>druid-spring-boot-starter</artifactId>
<version>${druid.verison}</version>
</dependency>
<!-- mybatis-springboot整合 -->
<dependency>
<groupId>org.mybatis.spring.boot</groupId>
<artifactId>mybatis-spring-boot-starter</artifactId>
<version>${mybatis.spring.boot.verison}</version>
</dependency>
<!--lombok-->
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<version>${lombok.version}</version>
</dependency>
<!--junit-->
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>${junit.version}</version>
</dependency>
<!-- log4j -->
<dependency>
<groupId>log4j</groupId>
<artifactId>log4j</artifactId>
<version>${log4j.version}</version>
</dependency>
</dependencies>
</dependencyManagement>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
<configuration>
<fork>true</fork>
<addResources>true</addResources>
</configuration>
</plugin>
</plugins>
</build>
</project>
开发环境设置记录：
新建Module:provider-payment8001
provider-payment8001的pom.xml
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-actuator</artifactId>
</dependency>
<dependency>
<groupId>org.mybatis.spring.boot</groupId>
<artifactId>mybatis-spring-boot-starter</artifactId>
</dependency>
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>druid-spring-boot-starter</artifactId>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-jdbc</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-devtools</artifactId>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
</dependency>
</dependencies>
application.yml
server:
port: 8081
spring:
application:
name: provider-payment8001
datasource:
type: com.alibaba.druid.pool.DruidDataSource
driver-class-name: org.gjt.mm.mysql.Driver
url: jdbc:mysql://localhost:3306/springcloud?useUnicode=true&characterEncoding=utf-8&useSSL=false
username: root
password: 123465
mybatis:
mapper-locations: classpath:mapper/*.xml
type-aliases-package: com.gx.springcloud.entity
启动注解: @SpringBootApplication
创建sql
CREATE TABLE `payment` (
`id` bigint(20) NOT NULL AUTO_INCREMENT COMMENT 'ID',
`serial` varchar(200) DEFAULT '',
PRIMARY KEY (`id`)
) ENGINE = InnoDB AUTO_INCREMENT = 1 DEFAULT CHARSET = utf8
写entity
package com.gx.springcloud.entity;
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
@Data
@AllArgsConstructor
@NoArgsConstructor
public class Payment {
private Long id;
private String serial;
}
写返回前端的entity
package com.gx.springcloud.entity;
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
@Data
@AllArgsConstructor
@NoArgsConstructor
public class Result<T> {
private boolean flag;
private String mes;
private T data;
public Result(boolean flag,String mes){
this(flag,mes,null);
}
}
写dao
package com.gx.springcloud.dao;
import com.gx.springcloud.entity.Payment;
import org.apache.ibatis.annotations.Mapper;
import org.apache.ibatis.annotations.Param;
@Mapper
public interface PaymentDao {
int create(Payment payment);
Payment selectPaymentById(@Param("id") long id);
}
写xml
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.gx.springcloud.dao.paymentDao">
<resultMap id="BaseResultMap" type="com.gx.springcloud.entity.Payment">
<id column="id" property="id" jdbcType="BIGINT"/>
<id column="serial" property="serial" jdbcType="VARCHAR"/>
</resultMap>
<insert id="create" parameterType="com.gx.springcloud.entity.Payment" useGeneratedKeys="true" keyProperty="id">
insert into payment(serial) values (#{serial})
</insert>
<select id="selectPaymentById" resultMap="BaseResultMap">
select * from payment where id = #{id}
</select>
</mapper>
在mybatis的配置文件中，有个叫keyProperty和useGeneratedKeys的属性。useGeneratedKeys 参数只针对 insert 语句生效，默认为 false。当设置为 true 时，表示如果插入的表以自增列为主键，则允许 JDBC 支持自动生成主键，并可将自动生成的主键返回。
具体用法：useGeneratedKeys=”true” keyProperty=”对应的主键的对象”。
写service
package com.gx.springcloud.service;
import com.gx.springcloud.entity.Payment;
public interface PaymentService {
int create(Payment payment);
Payment selectPaymentById(long id);
}
写serviceImpl
package com.gx.springcloud.serviceImpl;
import com.gx.springcloud.dao.PaymentDao;
import com.gx.springcloud.entity.Payment;
import com.gx.springcloud.service.PaymentService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
@Service
public class PaymentServiceImpl implements PaymentService {
@Autowired
PaymentDao paymentDao;
public int create(Payment payment){
return paymentDao.create(payment);
}
public Payment selectPaymentById(long id){
return paymentDao.selectPaymentById(id);
}
}
写controller
package com.gx.springcloud.controller;
import com.gx.springcloud.entity.Payment;
import com.gx.springcloud.entity.Result;
import com.gx.springcloud.service.PaymentService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.*;
/**
* @Author GX
* @Date 2020-03-20 10:33
*/
@RestController
@Slf4j
@RequestMapping("/payment")
public class PaymentController {
@Autowired
private PaymentService paymentService;
@PostMapping("/create")
public Result create(Payment payment){
Result result = null;
try{
int num = paymentService.create(payment);
if(num>0){
result=new Result(true,"插入数据成功");
log.info("******插入"+payment+"成功******");
}else{
result=new Result(false,"插入数据失败");
log.info("******插入"+payment+"失败******");
}
}catch (Exception e){
result=new Result(false,"插入数据失败");
e.printStackTrace();
}
return result;
}
@GetMapping("/get/{id}")
public Result getPaymentById(@PathVariable Long id){
Result result = null;
try{
Payment payment = paymentService.selectPaymentById(id);
if(payment != null){
result=new Result(true,"获取数据成功",payment);
log.info("******根据id:"+id+"获取"+payment+"成功******");
}else{
result=new Result(false,"获取数据失败");
log.info("******根据id:"+id+"获取数据失败******");
}
}catch (Exception e){
result=new Result(false,"获取数据失败");
e.printStackTrace();
}
return result;
}
}