SpingBoot学习总结

客官°小女子只卖身不卖艺 2022-04-01 13:20 202阅读 0赞

##  一.项目初始配置 ##

### 1.1 引入依赖 ###

<?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>2.1.1.RELEASE</version>
            <relativePath/> 
        </parent>
        <groupId>com.lxy</groupId>
        <artifactId>springbootdemo</artifactId>
        <version>0.0.1-SNAPSHOT</version>
        <name>springbootdemo</name>
        <packaging>jar</packaging>
        <description>Demo project for Spring Boot</description>
    
        <properties>
            <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
            <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
            <java.version>1.8</java.version>
        </properties>
    
        <dependencies>
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-web</artifactId>
            </dependency>
            
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-test</artifactId>
                <scope>test</scope>
            </dependency>
            
            <dependency>
                <groupId>org.mybatis.spring.boot</groupId>
                <artifactId>mybatis-spring-boot-starter</artifactId>
                <version>1.1.1</version>
            </dependency>
            
            <dependency>
                <groupId>mysql</groupId>
                <artifactId>mysql-connector-java</artifactId>
            </dependency>
            
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-data-redis</artifactId>
            </dependency>
        </dependencies>
    
        <build>
            <plugins>
                <plugin>
                    <groupId>org.springframework.boot</groupId>
                    <artifactId>spring-boot-maven-plugin</artifactId>
                </plugin>
            </plugins>
        </build>
    
    </project>

### 1.2  **添加数据库连接信息** ###

在application.properties中添加数据量的连接信息

spring.datasource.driverClassName=com.mysql.jdbc.Driver
    spring.datasource.url=jdbc:mysql://127.0.0.1:3306/springboottest?serverTimezone=GMT%2B8
    spring.datasource.username=root
    spring.datasource.password=root

### 1.3 创建数据库表 ###

CREATE TABLE `user` (
      `id` int(11) NOT NULL AUTO_INCREMENT,
      `username` varchar(50) DEFAULT NULL,
      `password` varchar(50) DEFAULT NULL,
      `name` varchar(50) DEFAULT NULL,
      PRIMARY KEY (`id`)
    ) ENGINE=InnoDB AUTO_INCREMENT=12 DEFAULT CHARSET=utf8;

### 1.4  创建实体Bean ###

public class User {
        private Long id;
        private String username;
        private String password;
        private String name;
        .................
    }

### 1.5 **编写****Mapper** ###

@Mapper
    public interface UserMapper {
        public List<User> queryUserList();
    }

### 1.6  **配置Mapper映射文件** ###

在src\\main\\resources\\mapper路径下加入UserMapper.xml配置文件"

<?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.lxy.mapper.UserMapper">
        <select id="queryUserList" resultType="com.lxy.domain.User">
            select * from user
        </select>
    </mapper>

### 1.7  **在application.properties中添加mybatis的信息** ###

mybatis.type-aliases-package=com.lxy.domain
    mybatis.mapper-locations=classpath:mapper/*Mapper.xml

### 1.8 **编写测试****Controller** ###

@Controller
    public class MybatisController {
    
        @Autowired
        private UserMapper userMapper;
    
        @RequestMapping("/query")
        @ResponseBody
        public List<User> queryUserList(){
            List<User> users = userMapper.queryUserList();
            return users;
        }
    
    }

### 1.9 测试 ###

![20181231003951267.png][]

## 二. **SpringBoot****整合****Spring Data**** ****JPA** ##

### 2.1  **添加****Spring**** ****Data**** ****JPA****的起步依赖** ###

<dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-data-jpa</artifactId>
            </dependency>

### 2.2 **添加数据库驱动依赖（添加请忽略）** ###

<dependency>
                <groupId>mysql</groupId>
                <artifactId>mysql-connector-java</artifactId>
            </dependency>

### 2.3 **在****application.properties****中配置数据库和****jpa****的相关属性** ###

#JPA Configuration:
    spring.jpa.database=MySQL 
    spring.jpa.show-sql=true 
    spring.jpa.generate-ddl=true
    spring.jpa.hibernate.ddl-auto=update
    spring.jpa.hibernate.naming_strategy=org.hibernate.cfg.ImprovedNamingStrategy

### 2.4 修改**实体配置实体** ###

@Entity
    public class User {
        @Id
        @GeneratedValue(strategy = GenerationType.IDENTITY)
        private Long id;
        private String username;
        private String password;
        private String name;
        .........................
    }

### 2.5  **编写****UserRepository** ###

public interface UserRepository extends JpaRepository<User,Long> {
        public List<User> findAll();
    }

### 2.6 **编写测试类** ###

### 2.7 测试 ###

![20181231010644507.png][]

## 三. SpringBoot整合Redis ##

### 3.1 添加redis的起步依赖 ###

<dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-data-redis</artifactId>
            </dependency>

### 3.2 **配置****redis****的连接信息** ###

#Redis
    spring.redis.host=127.0.0.1
    spring.redis.port=6379

### 3.3  **注入****RedisTemplate****测试****redis****操作** ###

@RunWith(SpringRunner.class)
    @SpringBootTest(classes = SpringbootdemoApplication.class)
    public class JpaTest {
    
        @Autowired
        private UserRepository userRepository;
        @Autowired
        private RedisTemplate<String, String> redisTemplate;
    
        @Test
        public void test() {
            String userListData = redisTemplate.boundValueOps("users.findAll").get();
            if(StringUtils.isEmpty(userListData)){
                List<User> users = userRepository.findAll();
                System.out.println("users:"+users);
                if(!CollectionUtils.isEmpty(users)){
                    //可以转json
                    redisTemplate.boundValueOps("users.findAll").set(users.toString());
                }
            }
            String userListData2 = redisTemplate.boundValueOps("users.findAll").get();
            System.out.println("userListData2############:"+userListData2);
        }
    }

## 四. **SpringBoot****整合数据源** ##

## 五.使用小技巧 ##

### 5.1 打包 ###

当你的 Spring Boot 准备提测或者上线，都需要打成 jar 包或者 war 包运行，war 包方式这里不说直接丢到 Server 里面运行即可，这里介绍直接运行 jar 包的方式。  
  
$ java -jar javastack-0.0.1-SNAPSHOT.jar  
  
这种方式也支持开启远程调试，如：  
  
$ java -Xdebug -Xrunjdwp:server=y,transport=dt\_socket,address=8000,suspend=n -jar javastack-0.0.1-SNAPSHOT.jar

### 5.2 用插件运行 ###

可以在 IDE 或者命令行中使用 Maven 和 Gradle 插件来运行 Spring Boot 应用。

1）Maven Plugin

$ mvn spring-boot:run

[20181231003951267.png]: /images/20220401/9f2c5f65025f4ba780f0fe3d8ce48da7.png
[20181231010644507.png]: /images/20220401/6d04297300d54bbe9fbab7de326a760b.png