Druid Ali developed with data from monitoring is recommended!
在pom文件中引入依赖
<!-- https://mvnrepository.com/artifact/com.alibaba/druid -->
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>druid</artifactId>
<version>1.1.21</version>
</dependency>
<!-- 因为druidj中配置了lo4j的日志功能,所以需要引入log4j -->
<dependency>
<groupId>log4j</groupId>
<artifactId>log4j</artifactId>
<version>1.2.17</version>
</dependency>
Our data source configuration file in application.yml
server:
port: 8888
spring:
datasource:
url: jdbc:mysql://localhost:3306/mybatis?useUnicode=true&&useSSL=false&&characterEncoding=UTF-8&&serverTimezone=GMT%2B8
driver-class-name: com.mysql.jdbc.Driver
username: root
password: 123456
type: com.alibaba.druid.pool.DruidDataSource
initialSize: 5
minIdle: 5
maxActive: 20
maxWait: 60000
timeBetweenEvictionRunsMillis: 60000
minEvictableIdleTimeMillis: 300000
validationQuery: SELECT 1 FROM DUAL
testWhileIdle: true
testOnBorrow: false
testOnReturn: false
poolPreparedStatements: true
# 配置监控统计拦截的filters , stat:监控统计、wall:防止SQL注入、log4j:日志记录
filters: stat,wall,log4j
maxPoolPreparedStatementPerConnectionSize: 20
useGlobalDataSourceStat: true
connectionProperties: druid.stat.mergeSql=true;druid.stat.slowSqlMillis=500
Configuring a DruidConfig class configuration of our Druid data sources used to customize the (dead code does not need to remember directly on the line)
package com.jee.config;
import com.alibaba.druid.pool.DruidDataSource;
import com.alibaba.druid.support.http.StatViewServlet;
import com.alibaba.druid.support.http.WebStatFilter;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.boot.web.servlet.FilterRegistrationBean;
import org.springframework.boot.web.servlet.ServletRegistrationBean;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import javax.sql.DataSource;
import java.util.Arrays;
import java.util.HashMap;
import java.util.Map;
@Configuration
public class DruidConfig {
@ConfigurationProperties(prefix = "spring.datasource")
@Bean
public DataSource druid(){
return new DruidDataSource();
}
//配置Druid的监控
//1、配置一个管理后台的Servlet
@Bean
public ServletRegistrationBean statViewServlet(){
ServletRegistrationBean bean = new ServletRegistrationBean(new StatViewServlet(), "/druid/*");
Map<String,String> initParams = new HashMap<>();
initParams.put("loginUsername","admin");
initParams.put("loginPassword","123456");
initParams.put("allow","");//默认就是允许所有访问
initParams.put("deny","192.168.15.21");
bean.setInitParameters(initParams);
return bean;
}
//2、配置一个web监控的filter
@Bean
public FilterRegistrationBean webStatFilter(){
FilterRegistrationBean bean = new FilterRegistrationBean();
bean.setFilter(new WebStatFilter());
Map<String,String> initParams = new HashMap<>();
initParams.put("exclusions","*.js,*.css,/druid/*");
bean.setInitParameters(initParams);
bean.setUrlPatterns(Arrays.asList("/*"));
return bean;
}
}
We went to look at Druid's web page monitoring page
to enter a user name and password we'll configuration class set to sign:
Above our Druid data source on the configuration finished
After configuring the data source we have is very simple to configure Mybatis framework
First import dependence:
<!-- https://mvnrepository.com/artifact/org.mybatis.spring.boot/mybatis-spring-boot-starter -->
<dependency>
<groupId>org.mybatis.spring.boot</groupId>
<artifactId>mybatis-spring-boot-starter</artifactId>
<version>1.3.2</version>
</dependency>
Create a database table and the corresponding entity class
public class User {
private int id;
private String name;
private String password;
public User() {
}
}
Create a mapper class
@Mapper //@Mapper注解表示这个接口是Mybatis中的Mapper类
@Repository //@Repository注解表示这个类是输入dao层的
public interface UserMapper {
//查找所有用户
public List<User> getAllUser();
}
Create a directory next to the resource mybatis/mapper
directory for storing files mapper.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">
<!--注意 这里我们的resultType用了别名 而不是全类名 这是我们再application.yml中配置的 我们待会就去配置-->
<mapper namespace="com.jee.mapper.UserMapper">
<select id="selectAllUser" resultType="User">
select * from user
</select>
</mapper>
Finally go application.yml configured in some of our mybatis
mybatis:
type-aliases-package: com.jee.entity #起别名的包 该包下所有的类都会自动设置别名 就是类本身的名字
mapper-locations: classpath:mybatis/mapper/*Mapper.xml #mapper.xml文件的存放位置
When we use the mapper interfaces can be automatically injected into the code
@Controller
public class MyController {
@Autowired
private UserMapper userMapper;
@RequestMapping("/aa")
@ResponseBody
public String fun1() throws JsonProcessingException {
List<User> allUser = userMapper.getAllUser();
ObjectMapper mapper = new ObjectMapper();
return (mapper.writeValueAsString(allUser));
}
}