springboot--使用JdbcTemplate和druid--实例

1 创建项目

整体pom文件如下

	4.0.0
	
		org.springframework.boot
		spring-boot-starter-parent
		2.1.3.RELEASE
		 
	
	com.zfh
	springboot-mysql-01
	0.0.1-SNAPSHOT
	springboot-mysql-01
	Demo project for Spring Boot

	
		1.8
	

	
		
			org.springframework.boot
			spring-boot-starter
		

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

         
		
			mysql
			mysql-connector-java
			runtime
		
		
		
		
		  org.springframework.boot
		  spring-boot-starter-jdbc
		
		
		
		
		
		
		  com.alibaba
		  druid
		  1.1.4
		
		
		
		
		  org.springframework.boot
		  spring-boot-starter-thymeleaf
		
		
		
	

	
		
			
				org.springframework.boot
				spring-boot-maven-plugin
			
		
	

2 创建POJO

package com.fhzheng.demo.entity;

import java.util.Date;

public class User {

	private String name;
	private String sex;
	private Integer age;
	private Date birthday;
	
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public String getSex() {
		return sex;
	}
	public void setSex(String sex) {
		this.sex = sex;
	}
	public Integer getAge() {
		return age;
	}
	public void setAge(Integer age) {
		this.age = age;
	}
	public Date getBirthday() {
		return birthday;
	}
	public void setBirthday(Date birthday) {
		this.birthday = birthday;
	}
	
	
}

和

package com.fhzheng.demo.entity;

public class User1 {

	private Integer id;
	private String username;
	private String password;
	public Integer getId() {
		return id;
	}
	public void setId(Integer id) {
		this.id = id;
	}
	public String getUsername() {
		return username;
	}
	public void setUsername(String username) {
		this.username = username;
	}
	public String getPassword() {
		return password;
	}
	public void setPassword(String password) {
		this.password = password;
	}
	
	
}

3 测试一下控制器

package com.fhzheng.demo.controller;

import java.util.ArrayList;
import java.util.Date;
import java.util.List;

import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;

import com.fhzheng.demo.entity.User;

@Controller
@RequestMapping("/user")
public class UserController {

	@RequestMapping("/test")
	public String test(Model model) {
		//查询用户
		List users = new ArrayList();
		
		User user1 = new User();
		user1.setName("郑丰华");
		user1.setSex("男"); 
		user1.setAge(20);
		user1.setBirthday(new Date());
		
		User user2 = new User();
		user2.setName("郑富华");
		user2.setSex("女"); 
		user2.setAge(30);
		user2.setBirthday(new Date());
		
		User user3 = new User();
		user3.setName("郑生华");
		user3.setSex("保密"); 
		user3.setAge(40);
		user3.setBirthday(new Date());
		
		users.add(user1);
		users.add(user2);
		users.add(user3);
		
		model.addAttribute("users",users);
		return "user";
	}
}

执行项目，查看控制器访问结果：

4 用junit方式测试JdbcTemplate访问数据库

4.1 配置application.properties文件

server.port  = 8081

### mysql连接信息
###### &allowMultiQueries=true&useSSL=false&serverTimezone=GMT%2B8
spring.datasource.url=jdbc:mysql://127.0.0.1:3306/test?useUnicode=true&characterEncoding=UTF-8&allowMultiQueries=true&useSSL=false&serverTimezone=GMT%2B8
### 用户名
spring.datasource.username=rootcuit
### 密码
spring.datasource.password=rootcuit
### 驱动
spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver

注意，端口配置是8081
这里的url配置一定要注意设置区时，否则解析可能出错

4.2 编写测试文件

	@Resource
	private JdbcTemplate jdbcTemplate;
	
	@Test
	public void mySqlTest() {
		
		String sql="select id,username,password from user";
		List userList = (List) jdbcTemplate.query(sql,new RowMapper() {
			@Override
			public User1 mapRow(ResultSet rs,int rowNum) throws SQLException{
				User1 user = new User1();
				user.setId(rs.getInt("id"));
				user.setUsername(rs.getString("username"));
				user.setPassword(rs.getString("password"));
				return user;
			}
		});
		System.out.println("查询成功：");
		for (User1 user : userList) {
			System.out.println("【id】:"+user.getId()+";【name】:"+user.getUsername() );
		}
		
	}
	

这里的测试，是直接调用jdbcTemplate的query方法，完成查询动作，然后再控制台输出查看结果.
4.3运行测试结果如下

5 试用druid

5.1 添加druid配置类

package com.fhzheng.demo.filter;

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 com.alibaba.druid.support.http.StatViewServlet;
import com.alibaba.druid.support.http.WebStatFilter;

@Configuration
public class DruidConfiguration {
	
	// TODO 未完成druid配置和测试

	// 配置类完成ServletRegistrationBean和FilterRegistrationBean实现
	// Servlet和Filter类的注册 
//	在druidStatViewServlet类中，设定访问数据库的白名单，黑名单，登录用户名和密码等信息
//	在druidStateFilter类中，设定了过滤的规则和需要忽略的格式
	
	@Bean
	public ServletRegistrationBean druidStatViewServlet(){
		ServletRegistrationBean servletRegistrationBean = new ServletRegistrationBean(new StatViewServlet(),"/druid/*");
		//添加初始化参数 initParams
		//白名单：
		servletRegistrationBean.addInitParameter("allow", "127.0.0.1");
		//IP黑名单(存在共同时，deny优先于allow)
		//如果满足deny,就提示：Sorry, you are not permitted to view this page.
		servletRegistrationBean.addInitParameter("deny","192.168.1.1");
		//登录查看信息的帐号和密码
		servletRegistrationBean.addInitParameter("loginUsername", "admin");
		servletRegistrationBean.addInitParameter("loginPassword", "123456");
		//是否能够重置数据
		servletRegistrationBean.addInitParameter("resetEnable", "false");
		return servletRegistrationBean;
	} 
	
	@Bean
	public FilterRegistrationBean druidStateFilter() {
		FilterRegistrationBean filterRegistrationBean = new FilterRegistrationBean(new WebStatFilter());
		//添加过滤规则
		filterRegistrationBean.addUrlPatterns("/*");
		//添加需要忽略的格式信息
		filterRegistrationBean.addInitParameter("exclusions", "*.js,*.gif,*.jpg,*.png,*.css,*.ico,/druid/*");
		return filterRegistrationBean;
	}
}

5.2 添加druid配置信息在application.properties文件中

###### druid配置信息
### 数据源类别
spring.datasource.type=com.alibaba.druid.pool.DruidDataSource
### 初始化参数：大小，最小，最大
spring.datasource.initialSize=5
spring.datasource.minIdle=5
spring.datasource.maxActive=20
### 超时时间
spring.datasource.maxWait=60000
### 检测并关闭空闲连接时间
spring.datasource.timeBetweenEvictionRunsMillis=60000
## 连接在池中的最小生存时间
spring.datasource.minEvictableIdleTimeMillis=300000
spring.datasource.validateQuery=SELECT 1 FROM DUAL
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filters，去掉后监控界面无法显示SQL无法统计，'wall'用于防火墙
spring.datasource.filters=stat,wall,log4j
### 通过connectionProperties属性来打开mergeSql功能，慢SQL记录
spring.datasource.connectionProperties=druid.stat.mergeSql=true;druid.stat.slowSqlMillis=5000

5.3 运行项目，测试
在地栏输入：http://localhost:8081/druid/

然后输入设置的用户名和密码：admin:123456

登录后的界面