- 通过maven的形式创建springboot工程。
- springboot工程中常见的配置文件类型。
- java如何读取springboot文件中的内容。
- springboot如何注册web三大组件。
- springboot自动装配的原理。
- springboot整合数据源。
- springboot整合mybatis.
- properties属性文件类型
- yml文件
properties的格式
yml文件的格式
(1)通过@ConfigurationProperties(prefix = “student”)
properties配置文件的内容
yml文件的配置内容
(2)通过@Value注解来读取
如果通过@value读取的为properties 不能读取map以及自定义的类型。 如果读取的yml那么只能读取基本数据类型以及String和date类型
. #3.java如何读取springboot文件中的内容。
(1)web三大组件包含的是什么
- Servlet:
- Filter:过滤器
- Listener:监听器
(1)注册servlet
2、创建一个配置类
@Bean
public ServletRegistrationBean servletBean(){
ServletRegistrationBean servletRegistrationBean=new ServletRegistrationBean();
servletRegistrationBean.setServlet(new MyServelt());
servletRegistrationBean.setName("MyServelt");
servletRegistrationBean.addUrlMappings("/my");
return servletRegistrationBean;
}
(2)注册filter
package com.yaokui.filter;
import javax.servlet.*; import java.io.IOException;
public class MyFilter implements Filter {
@Override
public void init(FilterConfig filterConfig) throws ServletException {} @Override public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws
IOException, ServletException {
System.out.println(“经过了filter过滤器”);
filterChain.doFilter(servletRequest, servletResponse);
}@Override public void destroy() { } }
注册该过滤器到Springboot容器中
@Bean public FilterRegistrationBean filterBean(){ FilterRegistrationBean filterRegistrationBean=new FilterRegistrationBean(); filterRegistrationBean.setFilter(new MyFilter()); filterRegistrationBean.setName("/MyFilter"); filterRegistrationBean.addUrlPatterns("/*"); return filterRegistrationBean; }
(3)注册Listener
package com.yaokui.listener;
import javax.servlet.ServletContextEvent; import
javax.servlet.ServletContextListener; import
javax.servlet.annotation.WebListener;@WebListener public class MyListener implements ServletContextListener
{
@Override
public void contextInitialized(ServletContextEvent sce) {
System.out.println(“监听器开启”);
}@Override public void contextDestroyed(ServletContextEvent sce) { System.out.println("监听器结束"); } }
2、创建listener配置类
@Bean public ServletListenerRegistrationBean listenerbean(){ ServletListenerRegistrationBean servletListenerRegistrationBean=new ServletListenerRegistrationBean(); servletListenerRegistrationBean.setListener(new MyListener()); return servletListenerRegistrationBean; }
在properties配置文件中加入如下的配置
spring.datasource.druid.username=root
spring.datasource.druid.password=123456
spring.datasource.druid.url=jdbc:mysql://localhost:3306/shop?serverTimezone=Asia/Shanghai
spring.datasource.druid.driver-class-name=com.mysql.cj.jdbc.Driver
测试是否连接数据库成功
package com.yk.datasource;
import org.junit.jupiter.api.Test; import
org.springframework.beans.factory.annotation.Autowired; import
org.springframework.boot.test.context.SpringBootTest;import javax.sql.DataSource; import java.sql.SQLException;
@SpringBootTest class DatasourceApplicationTests {
@Autowired
private DataSource dataSource;
@Test
void contextLoads() throws SQLException {
// System.out.println(dataSource);
System.out.println(dataSource.getConnection());
}
}
(1)引入相关的依赖
<?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 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>2.5.1</version>
</parent>
<groupId>com.yaokui</groupId>
<artifactId>demo11</artifactId>
<version>1.0-SNAPSHOT</version>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-quartz</artifactId>
</dependency>
</dependencies>
</project>
(2)配置mybatis映射文件所在的路径
spring.datasource.druid.username=root
spring.datasource.druid.password=123456
spring.datasource.druid.url=jdbc:mysql://localhost:3306/shop?serverTimezone=Asia/Shanghai
spring.datasource.druid.driver-class-name=com.mysql.cj.jdbc.Driver
#配置映射文件所在的路径
mybatis.mapper-locations=classpath:/mapper/*.xml
logging.level.com.yk.surshop.mapper=debug
#mybatis.configuration.mapUnderscoreToCamelCase=true
#指定thymeleaf的前缀
spring.thymeleaf.prefix=classpath:/templates/style/
(3)创建相应的entity以及mapper
public interface UserMapper {
public List findAll();
}
<?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.yk.surshop.mapper.EmpMapper">
<!--查询-->
<select id="selectEmp" resultType="com.yk.surshop.entry.TabEmp">
select * from tab_emp
</select>
<!--新增-->
<insert id="insertEmp" parameterType="com.yk.surshop.entry.TabEmp">
insert into tab_emp (emp_name,emp_sex,emp_birth,emp_phone,emp_addr,emp_dist,emp_hiredate)
values
(#{emp_name},#{emp_sex},#{emp_birth},#{emp_phone},#{emp_addr},#{emp_dist},#{emp_hiredate})
</insert>
<!--修改-->
<update id="updateEmp" parameterType="com.yk.surshop.entry.TabEmp">
update tab_emp set emp_name=#{emp_name},emp_sex=#{emp_sex},emp_birth=#{emp_birth},emp_phone=#{emp_phone},
emp_addr=#{emp_addr},emp_dist=#{emp_dist},emp_hiredate=#{emp_hiredate}
</update>
<!--删除-->
<delete id="deleteEmp" parameterType="int">
delete from tab_emp where emp_id=#{emp_id}
</delete>
<select id="selectEmpById" parameterType="int" resultType="com.yk.surshop.entry.TabEmp">
select *
from tab_emp where emp_id=#{emp_id}
</select>
</mapper>