SpringBoot2.X之旅，JPA+Durid+Mysql实践Druid Monitor笔记demo（Web Project）
一、开发环境
本文的开发环境是跟之前的一篇文章一样的SpringBoot2.X之旅，开篇 hello world（Web Project）
二、搭建项目基础：
1、Idea新建web项目，需要引入的包如图：
2、在pom.xml中加入druid的包，可以参照druid的文档
https://github.com/alibaba/druid/tree/master/druid-spring-boot-starter
最终pom.xml文件如下：
4.0.0
org.springframework.boot
spring-boot-starter-parent
2.1.3.RELEASE
com.cobra
jpademo
0.0.1-SNAPSHOT
jpademo
Demo project for Spring Boot
1.8
org.springframework.boot
spring-boot-starter-data-jpa
org.springframework.boot
spring-boot-starter-web
mysql
mysql-connector-java
runtime
com.alibaba
druid-spring-boot-starter
1.1.10
org.projectlombok
lombok
true
org.springframework.boot
spring-boot-starter-test
test
org.springframework.boot
spring-boot-maven-plugin
3、根据durid文档，配置连接需要的参数，这里我只做了最简单的配置，同时加入了WebStatFilter配置、StatViewServlet（监控页面）、AOP监控配置、同时设置sql语句控制台输出，这里给Druid Monitor设置的用户名/密码为：admin/admin：
spring:
datasource:
username: root
password: 123456
url: jdbc:mysql://127.0.0.1:3306/demo?serverTimezone=UTC&characterEncoding=utf-8&useSSL=false
# 一、WebStatFilter配置，说明请参考Druid Wiki，配置_配置WebStatFilter
druid:
web-stat-filter:
#是否启用StatFilter默认值false
enabled: true
url-pattern: "/*"
exclusions: "*.js,*.gif,*.jpg,*.png,*.css,*.ico,/druid/*"
session-stat-enable: "true"
# session-stat-max-count:
# principal-session-name:
# principal-cookie-name:
# profile-enable:
#二、是否启用StatViewServlet（监控页面）默认值为false（考虑到安全问题默认并未启动，如需启用建议设置密码或白名单以保障安全）
stat-view-servlet:
# Spring监控配置，说明请参考Druid Github Wiki，配置_Druid和Spring关联监控配置
enabled: true
url-pattern: "/druid/*"
reset-enable: "true"
login-username: "admin"
login-password: "admin"
allow: "192.168.0.100,127.0.0.1"
deny: "192.168.0.101"
#三、Spring监控AOP切入点，如x.y.z.service.*,配置多个英文逗号分隔
aop-patterns: "com.cobra.jpademo.service.impl.OrderServiceImpl.*"
#控制台输出sql
jpa:
show-sql: true
open-in-view: false4、本人使用的mysql5.7版本，如果版本不一样，表很简单，可以自行建表，数据库表和数据
/*
Navicat Premium Data Transfer
Source Server : localhost
Source Server Type : MySQL
Source Server Version : 50724
Source Host : localhost:3306
Source Schema : demo
Target Server Type : MySQL
Target Server Version : 50724
File Encoding : 65001
Date: 09/03/2019 19:20:22
*/
SET NAMES utf8mb4;
SET FOREIGN_KEY_CHECKS = 0;
-- ----------------------------
-- Table structure for order_info
-- ----------------------------
DROP TABLE IF EXISTS `order_info`;
CREATE TABLE `order_info` (
`order_id` int(255) NOT NULL AUTO_INCREMENT,
`order_desc` varchar(255) CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL,
`order_fee` decimal(65, 0) NOT NULL,
`user_id` int(255) NOT NULL,
PRIMARY KEY (`order_id`) USING BTREE
) ENGINE = InnoDB AUTO_INCREMENT = 4 CHARACTER SET = utf8 COLLATE = utf8_general_ci ROW_FORMAT = Dynamic;
-- ----------------------------
-- Records of order_info
-- ----------------------------
INSERT INTO `order_info` VALUES (1, '第一个订单', 12, 1);
INSERT INTO `order_info` VALUES (2, '第二个订单', 120, 2);
INSERT INTO `order_info` VALUES (3, '第三个订单', 60, 2);
-- ----------------------------
-- Table structure for user_info
-- ----------------------------
DROP TABLE IF EXISTS `user_info`;
CREATE TABLE `user_info` (
`user_id` int(11) NOT NULL AUTO_INCREMENT,
`username` varchar(255) CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL,
`password` varchar(255) CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL,
`email` varchar(255) CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL,
PRIMARY KEY (`user_id`) USING BTREE
) ENGINE = InnoDB AUTO_INCREMENT = 3 CHARACTER SET = utf8 COLLATE = utf8_general_ci ROW_FORMAT = Dynamic;
-- ----------------------------
-- Records of user_info
-- ----------------------------
INSERT INTO `user_info` VALUES (1, '周伯通', '123abc', '[email protected]');
INSERT INTO `user_info` VALUES (2, '黄药师', '456def', '[email protected]');
SET FOREIGN_KEY_CHECKS = 1;三、基本配置完成，开始coding：
1、数据实体类dataobject：
UserInfo：
package com.cobra.jpademo.dataobject;
import lombok.Data;
import javax.persistence.Entity;
import javax.persistence.Id;
/**
* @Author: Baron
* @Description: 用户dataobject
* @Date: Created in 2019/3/8 18:29
*/
@Entity
@Data
public class UserInfo {
@Id
private Integer userId;
private String username;
private String password;
private String email;
}OrderInfo：
package com.cobra.jpademo.dataobject;
import lombok.Data;
import javax.persistence.Entity;
import javax.persistence.Id;
import java.math.BigDecimal;
/**
* @Author: Baron
* @Description: 订单dataobject
* @Date: Created in 2019/3/8 18:20
*/
@Data
@Entity
public class OrderInfo {
@Id
private Integer orderId;
private String orderDesc;
private BigDecimal orderFee;
private Integer userId;
}2、基础的目录结构如下，本文为了演示方便，只有dataobject，真实项目中是需要VO、DTO等传递数据，否则直接暴露数据库结构给前端，是绝对不允许的行为：
1、repository层，也就是我们所说的dao，新建UserInfoRepository、OrderInfoRepository接口，继承JpaRepository指定实体类和主键类型：
1）UserInfoRepository
package com.cobra.jpademo.repository;
import com.cobra.jpademo.dataobject.UserInfo;
import org.springframework.data.jpa.repository.JpaRepository;
/**
* @Author: Baron
* @Description: 用户Repository
* @Date: Created in 2019/3/8 18:36
*/
public interface UserInfoRepository extends JpaRepository {
} 2）OrderInfoRepository，这里新建一个特殊的根据userId查询订单的方法findByUserId(Integer userId)，注意方法名是有一定规律的，可以根据idea的提示自动补全：
package com.cobra.jpademo.repository;
import com.cobra.jpademo.dataobject.OrderInfo;
import com.cobra.jpademo.dataobject.UserInfo;
import org.springframework.data.jpa.repository.JpaRepository;
import java.util.List;
/**
* @Author: Baron
* @Description: 订单Repository
* @Date: Created in 2019/3/8 18:36
*/
public interface OrderInfoRepository extends JpaRepository {
/**
* 根据UserId查询订单
* @param userId
* @return
*/
List findByUserId(Integer userId);
} 3、service层：
1）新建对应的接口，并分别定义方法：
UserService，查询所有用户（为了演示，分页就不做了）：
package com.cobra.jpademo.service;
import com.cobra.jpademo.dataobject.UserInfo;
import java.util.List;
/**
* @Author: Baron
* @Description: 用户Service接口
* @Date: Created in 2019/3/8 23:46
*/
public interface UserService {
/**
* 查询所有用户
* @return
*/
List findAllUser();
} OrderService，根据userId查询订单
package com.cobra.jpademo.service;
import com.cobra.jpademo.dataobject.OrderInfo;
import java.util.List;
/**
* @Author: Baron
* @Description: 订单服务接口
* @Date: Created in 2019/3/8 23:48
*/
public interface OrderService {
/**
* 根据userId查找订单
* @param userId
* @return
*/
List findOrdersByUserId(Integer userId);
} 2）service接口实现
UserServiceImpl：
package com.cobra.jpademo.service.impl;
import com.cobra.jpademo.dataobject.UserInfo;
import com.cobra.jpademo.repository.UserInfoRepository;
import com.cobra.jpademo.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import java.util.List;
/**
* @Author: Baron
* @Description: 用户Service接口
* @Date: Created in 2019/3/8 23:51
*/
@Service
public class UserServiceImpl implements UserService {
@Autowired
private UserInfoRepository repository;
/**
* 查询所有用户
* @return
*/
@Override
public List findAllUser() {
return repository.findAll();
}
} OrderServiceIml：
package com.cobra.jpademo.service.impl;
import com.cobra.jpademo.dataobject.OrderInfo;
import com.cobra.jpademo.repository.OrderInfoRepository;
import com.cobra.jpademo.service.OrderService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import java.util.List;
/**
* @Author: Baron
* @Description: 订单Service实现
* @Date: Created in 2019/3/8 23:49
*/
@Service
public class OrderServiceImpl implements OrderService {
@Autowired
private OrderInfoRepository repository;
/**
* 根据userId查找订单
* @param userId
* @return
*/
@Override
public List findOrdersByUserId(Integer userId) {
return repository.findByUserId(userId);
}
} 4、controller层，这里以json格式返回数据，直接使用@RestController注解
UserController：
package com.cobra.jpademo.controller;
import com.cobra.jpademo.dataobject.UserInfo;
import com.cobra.jpademo.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import java.util.List;
/**
* @Author: Baron
* @Description: 用户controller
* @Date: Created in 2019/3/8 23:41
*/
@RestController
@RequestMapping("/user")
public class UserController {
@Autowired
private UserService userService;
/**
* 获取所有的用户
* @return
*/
@GetMapping("/all")
public List findAllUsers() {
return userService.findAllUser();
}
} OrderController：
package com.cobra.jpademo.controller;
import com.cobra.jpademo.dataobject.OrderInfo;
import com.cobra.jpademo.service.OrderService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.*;
import java.util.List;
/**
* @Author: Baron
* @Description: 订单controller
* @Date: Created in 2019/3/8 23:41
*/
@RestController
@RequestMapping("/order")
public class OrderController {
@Autowired
private OrderService orderService;
/**
* 根据userId获取订单
* @param userId
* @return
*/
@GetMapping("/user/{userId}")
public List getOrdersByUserId(@PathVariable("userId") Integer userId) {
return orderService.findOrdersByUserId(userId);
}
} 四、启动项目，测试：
1、接口1：浏览器输入：http://localhost:8080/user/all
2、接口2：浏览器输入：http://localhost:8080/order/user/2
3、打开Druid Monitor，浏览器输入：http://localhost:8080/druid/login.html
填写用户名/密码：admin/admin，登录：
就可以查看你需要监控的数据了：
sql：
接口：
aop：
