系列导航

springBoot项目打jar包

1、springboot工程新建(单模块)

2、springboot创建多模块工程

3、springboot连接数据库

4、SpringBoot连接数据库引入druid

5、SpringBoot连接数据库引入mybatis

6、SpringBoot-mybatis分页实现pagehelper

7、SpringBoot-mybatis-plus引入

8、SpringBoot 事务

9、SpringBoot-mybatis-druid多源数据多源数据

10、SpringBoot-mybatis-plus-druid多源数据

11、SpringBoot-mybatis-plus-druid多源数据事务

12、SpringBoot-mybatis-plus-ehcache

13、SpringBoot-配置文件里密码加密

14、SpringBoot-easyexcel导出excle

完结

SpringBoot连接数据库引入mybatis

1、 在上一个项目的基础上pom.xml增加mybatis的依赖

<?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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.example</groupId>
<artifactId>demo</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>demo</name>
<description>Demo project for Spring Boot</description> <properties>
<java.version>1.8</java.version>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
<spring-boot.version>2.1.17.RELEASE</spring-boot.version>
</properties> <dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-jdbc</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency> <dependency>
<groupId>com.oracle</groupId>
<artifactId>ojdbc6</artifactId>
<version>11.2.0.3</version>
</dependency> <!-- 集成druid -->
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>druid-spring-boot-starter</artifactId>
<version>1.1.10</version>
</dependency> <!-- 集成mybatis -->
<dependency>
<groupId>org.mybatis.spring.boot</groupId>
<artifactId>mybatis-spring-boot-starter</artifactId>
<version>1.3.2</version>
</dependency> <dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
<exclusions>
<exclusion>
<groupId>org.junit.vintage</groupId>
<artifactId>junit-vintage-engine</artifactId>
</exclusion>
</exclusions>
</dependency>
</dependencies> <dependencyManagement>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-dependencies</artifactId>
<version>${spring-boot.version}</version>
<type>pom</type>
<scope>import</scope>
</dependency>
</dependencies>
</dependencyManagement> <build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.8.1</version>
<configuration>
<source>1.8</source>
<target>1.8</target>
<encoding>UTF-8</encoding>
</configuration>
</plugin>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
<version>2.1.17.RELEASE</version>
<configuration>
<mainClass>com.example.demo.DemoApplication</mainClass>
</configuration>
<executions>
<execution>
<id>repackage</id>
<goals>
<goal>repackage</goal>
</goals>
</execution>
</executions>
</plugin>
</plugins>
</build> </project>

2、application.properties配置

增加mybatis的配置,如下红色部分

# 应用名称
spring.application.name=demo
# 应用服务 WEB 访问端口
server.port=8080 # 数据库设置
spring.datasource.driverClassName=oracle.jdbc.OracleDriver
spring.datasource.url=jdbc:oracle:thin:@192.168.0.100:1521:orcl
spring.datasource.username=zy
spring.datasource.password=1 # druid配置
spring.datasource.type=com.alibaba.druid.pool.DruidDataSource # druid参数调优(可选)
# 初始化大小,最小,最大
spring.datasource.initialSize=5
spring.datasource.minIdle=5
spring.datasource.maxActive=20
# 配置获取连接等待超时的时间
spring.datasource.maxWait=60000
# 配置间隔多久才进行一次检测,检测需要关闭的空闲连接,单位是毫秒
spring.datasource.timeBetweenEvictionRunsMillis=60000
# 配置一个连接在池中最小生存的时间,单位是毫秒
spring.datasource.minEvictableIdleTimeMillis=300000
# 测试连接
spring.datasource.testWhileIdle=true
spring.datasource.testOnBorrow=false
spring.datasource.testOnReturn=false
# 打开PSCache,并且指定每个连接上PSCache的大小
spring.datasource.poolPreparedStatements=true
spring.datasource.maxPoolPreparedStatementPerConnectionSize=20
# 配置监控统计拦截的filters
spring.datasource.filters=stat
# asyncInit是1.1.4中新增加的配置,如果有initialSize数量较多时,打开会加快应用启动时间
spring.datasource.asyncInit=true ## mybatis配置
# 参数类型的包别名设置
mybatis.typeAliasesPackage=com.example.demo.domain
# 指向映射xml文件目录
mybatis.mapperLocations=classpath:mapper/*.xml
注:typeAliasesPackage:参数类型的包别名设置,设置这个以后xml映射文件在parameterType的值就不用写成全路径名了,parameterType=”com.example.demo.domain.Block”可以写成parameterType = “Block”

4、文件目录

5、启动类DemoApplication 上添加 @MapperScan注解

@MapperScan的作用是指定要扫描的mybatis映射类的路径,放在应用类的前面:


package com.example.demo;

import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.stereotype.Component; @SpringBootApplication
//指定要扫描的mybatis映射类的路径
@MapperScan("com.example.demo.mapper")
public class DemoApplication {
public static void main(String[] args) {
SpringApplication.run(DemoApplication.class, args);
}
}

6、代码部分

DruidConfig的配置类
package com.example.demo.config;

import java.sql.SQLException;

import javax.sql.DataSource;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Primary; import com.alibaba.druid.pool.DruidDataSource; @Configuration
public class DruidConfig {
private Logger logger = LoggerFactory.getLogger(DruidConfig.class); @Value("${spring.datasource.url}")
private String dbUrl; @Value("${spring.datasource.username}")
private String username; @Value("${spring.datasource.password}")
private String password; @Value("${spring.datasource.driver-class-name}")
private String driverClassName; @Value("${spring.datasource.initial-size}")
private int initialSize; @Value("${spring.datasource.min-idle}")
private int minIdle; @Value("${spring.datasource.max-active}")
private int maxActive; @Value("${spring.datasource.max-wait}")
private int maxWait; @Value("${spring.datasource.time-between-eviction-runs-millis}")
private int timeBetweenEvictionRunsMillis; @Value("${spring.datasource.min-evictable-idle-time-millis}")
private int minEvictableIdleTimeMillis; // @Value("${spring.datasource.validation-query}")
// private String validationQuery; @Value("${spring.datasource.test-while-idle}")
private boolean testWhileIdle; @Value("${spring.datasource.test-on-borrow}")
private boolean testOnBorrow; @Value("${spring.datasource.test-on-return}")
private boolean testOnReturn; @Value("${spring.datasource.pool-prepared-statements}")
private boolean poolPreparedStatements; @Value("${spring.datasource.max-pool-prepared-statement-per-connection-size}")
private int maxPoolPreparedStatementPerConnectionSize; @Value("${spring.datasource.filters}")
private String filters; @Bean //声明其为Bean实例
@Primary //在同样的DataSource中,首先使用被标注的DataSource
public DataSource dataSource(){
DruidDataSource datasource = new DruidDataSource(); datasource.setUrl(this.dbUrl);
datasource.setUsername(username);
datasource.setPassword(password);
datasource.setDriverClassName(driverClassName); //configuration
datasource.setInitialSize(initialSize);
datasource.setMinIdle(minIdle);
datasource.setMaxActive(maxActive);
datasource.setMaxWait(maxWait);
datasource.setTimeBetweenEvictionRunsMillis(timeBetweenEvictionRunsMillis);
datasource.setMinEvictableIdleTimeMillis(minEvictableIdleTimeMillis);
// datasource.setValidationQuery(validationQuery);
datasource.setTestWhileIdle(testWhileIdle);
datasource.setTestOnBorrow(testOnBorrow);
datasource.setTestOnReturn(testOnReturn);
datasource.setPoolPreparedStatements(poolPreparedStatements);
datasource.setMaxPoolPreparedStatementPerConnectionSize(maxPoolPreparedStatementPerConnectionSize);
try {
datasource.setFilters(filters);
} catch (SQLException e) {
logger.error("druid configuration initialization filter", e);
}
// datasource.setConnectionProperties(connectionProperties); return datasource;
}
}
Block  实体定义 
package com.example.demo.domain;

public class  Block   {
private String blockId; private String blockName; public String getBlockId() {
return blockId;
} public void setBlockId(String blockId) {
this.blockId = blockId;
} public String getBlockName() {
return blockName;
} public void setBlockName(String blockName) {
this.blockName = blockName;
} @Override
public String toString() {
return "XyDicBlockT{" +
"blockId='" + blockId + '\'' +
", blockName='" + blockName + '\'' +
'}';
}
}

mapper文件

package com.example.demo.mapper;

import com.example.demo.domain.Block;
import org.apache.ibatis.annotations.Mapper; public interface BlockMapper {
// 对应xml映射文件元素的ID
Block selectByPrimaryKey(String blockId);
}

接口类

package com.example.demo.service;

import com.example.demo.domain.Block;

public interface  BlockService {

    Block getUserById(String userId);

}

接口实现类

package com.example.demo.service.impl;

import javax.annotation.Resource;

import com.example.demo.domain.Block;
import com.example.demo.mapper.BlockMapper;
import com.example.demo.service.BlockService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service; @Service
public class BlockServiceImpl implements BlockService { // 注入mapper类
@Autowired
private BlockMapper blockMapper; @Override
public Block getUserById(String blockId) {
return blockMapper.selectByPrimaryKey(blockId);
}
}

xml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.example.demo.mapper.BlockMapper">
<resultMap id="BaseResultMap" type="com.example.demo.domain.Block">
<result property="blockId" column="block_Id"/>
<result property="blockName" column="block_Name"/>
</resultMap> <sql id="Base_Column_List">
block_id,block_name
</sql>
<select id="selectByPrimaryKey" parameterType="String" resultMap="BaseResultMap">
select
<include refid="Base_Column_List" />
from TEST_BLOCK_T
where block_Id = #{blockId,jdbcType=VARCHAR}
</select>
</mapper>

控制器类

package com.example.demo.controller;

import com.example.demo.domain.Block;
import com.example.demo.service.BlockService; import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.*; @RestController
@RequestMapping("/hello")
public class HelloController { @Autowired
private BlockService blockService; @GetMapping("/list")
@ResponseBody
public Block index() { Block block = blockService.getUserById("1"); return block;
}
}

7、启动项目访问项目


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