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What is the method for ssm to transform spring boot project?

WBOYforward: 2023-05-16 08:28:05540browse

Add dependencies

If it is a normal Maven project, you need to add it manually.


jar



    org.springframework.boot
    spring-boot-starter-parent
    2.3.3.RELEASE



    
    
        org.springframework.boot
        spring-boot-starter-web
    
    
    
        org.springframework.boot
        spring-boot-starter-test
        test
    
    
    
        org.projectlombok
        lombok
        provided

Add startup class

If it is a normal Maven project, it needs to be added manually.

@SpringBootApplication
public class xxxApplication {
    public static void main(String[] args) {
        SpringApplication.run(xxxApplication.class, args);
    }
}

Copy project code

Copy all the java code in src\main\java to src\main\java in the new project.
Copy the directory where mapper.xml is stored in src\main\resources to src\main\resources in the new project.

What to copy in the following steps

Configure the database connection pool

Add dependencies



    mysql
    mysql-connector-java
    runtime

You also need jdbc dependencies (transactions)

Automatic configuration method of connection pool

application.properties

spring.datasource.driver-class-name=com.mysql.jdbc.Driver
spring.datasource.url=jdbc:mysql:///数据库库名?useUnicode=true&characterEncoding=utf8&serverTimezone=GMT%2B8
spring.datasource.username=root
spring.datasource.password=admin

At this time, the database connection pool object obtained by running the test can be executed successfully, and we see the connection pool used It's Hikari, the full name is Hikaricp.

In fact, after Spring Boot 2.0, the default connection pool used is Hikari, which is known as "the fastest connection pool in history", so we can use it directly without adding dependencies. Spring Boot The automatic configuration contains the DataSourceAutoConfiguration configuration class. It will first check whether there is a connection pool object in the container. If not, the default connection pool will be used and the connection pool object will be automatically configured according to specific properties. The property values used come from DataSourceProperties object.

Configure Druid connection pool

Of course, if we still want to use Druid as the connection pool in the project, it is also possible. You only need to add dependencies. What is added at this time is the druid-spring-boot-starter automatic configuration package of Druid, which contains the DruidDataSourceAutoConfigure automatic configuration class, which will automatically create the Druid connection pool object, so Spring If Boot finds that there is already a connection pool object, it will no longer use Hikari.



    com.alibaba
    druid-spring-boot-starter
    1.1.21

Note: If the added dependency is the previous ordinary package, which only depends on Druid itself and is not an automatic configuration package, the following configuration is required:


    com.alibaba
    druid
    1.1.19

Add parameters in the configuration file

spring.datasource.type=com.alibaba.druid.pool.DruidDataSource

So generally if Spring Boot-related automatic configuration packages have been provided, it will be more convenient to use automatic configuration directly.

For Hikari and Druid, both are open source products. Alibaba’s Druid has a Chinese open source community, which makes communication more convenient and has been tested by multiple Alibaba systems. The experiment is also very stable, and Hikari is the default connection pool of Spring Boot 2.0. It is also widely used around the world. For most businesses, it is almost the same which one to use. After all, the performance bottleneck is generally not in the connection pool. .

Integrate MyBatis

Add dependencies



    org.mybatis.spring.boot
    mybatis-spring-boot-starter
    1.3.1

Configure Mapper object

Scan Mapper interfaceJust configure any class in ##Post a comment@MapperScan and specify the package path to be scanned.

@SpringBootApplication
@MapperScan("cn.xxx.mapper")
public class SsmApplication {
    public static void main(String[] args) {
        SpringApplication.run(SsmApplication.class, args);
    }
}

MyBatis configuration properties

Configure those MyBatis properties previously configured in XML in application.properties, with the property prefix mybatis.

# 配置别名
mybatis.type-aliases-package=cn.xxx.domain

# 打印 SQL 日志
logging.level.cn.xxx.mapper=trace

Transaction management

Add dependency



    org.springframework.boot
    spring-boot-starter-jdbc

Annotation method

Directly on the

business layer implementation class or directly on its method Just post the @Transactional comment.

Spring Boot automatic configuration provides the TransactionAutoConfiguration transaction annotation automatic configuration class. After the transaction dependency is introduced, the

@Transactional annotation can be used directly.

Configure switching agent

Spring Boot gives priority to the CGLIB agent by default. If you need to change to the JDK agent first, you need to do the following configuration:

spring.aop.proxy-target-class=false

Test verification

Add a method to the test class and print the business object to see its true type.

@Test
public void testSave() {
    System.out.println(departmentService.getClass());
}

Integrated Web

Add dependencies



    org.springframework.boot
    spring-boot-starter-web

Modify the port