Spring Boot 2.x基础教程：使用国产数据库连接池Druid

Author: dyc87112

2.1.x/chapter3-3/.gitignore

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+HELP.md
+/target/
+!.mvn/wrapper/maven-wrapper.jar
+
+### STS ###
+.apt_generated
+.classpath
+.factorypath
+.project
+.settings
+.springBeans
+.sts4-cache
+
+### IntelliJ IDEA ###
+.idea
+*.iws
+*.iml
+*.ipr
+
+### NetBeans ###
+/nbproject/private/
+/nbbuild/
+/dist/
+/nbdist/
+/.nb-gradle/
+/build/
+
+### VS Code ###
+.vscode/

2.1.x/chapter3-3/pom.xml

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+<?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>2.1.3.RELEASE</version>
+		<relativePath/> <!-- lookup parent from repository -->
+	</parent>
+
+	<groupId>com.didispace</groupId>
+	<artifactId>chapter3-3</artifactId>
+	<version>0.0.1-SNAPSHOT</version>
+
+	<properties>
+		<java.version>1.8</java.version>
+	</properties>
+
+	<dependencies>
+		<dependency>
+			<groupId>org.springframework.boot</groupId>
+			<artifactId>spring-boot-starter-web</artifactId>
+		</dependency>
+
+		<dependency>
+			<groupId>org.springframework.boot</groupId>
+			<artifactId>spring-boot-starter-jdbc</artifactId>
+		</dependency>
+
+		<dependency>
+			<groupId>com.alibaba</groupId>
+			<artifactId>druid-spring-boot-starter</artifactId>
+			<version>1.1.21</version>
+		</dependency>
+
+		<dependency>
+			<groupId>org.springframework.boot</groupId>
+			<artifactId>spring-boot-starter-actuator</artifactId>
+		</dependency>
+
+		<dependency>
+			<groupId>mysql</groupId>
+			<artifactId>mysql-connector-java</artifactId>
+		</dependency>
+
+		<dependency>
+			<groupId>org.projectlombok</groupId>
+			<artifactId>lombok</artifactId>
+			<scope>provided</scope>
+		</dependency>
+
+		<dependency>
+			<groupId>org.springframework.boot</groupId>
+			<artifactId>spring-boot-starter-test</artifactId>
+			<scope>test</scope>
+		</dependency>
+	</dependencies>
+
+	<build>
+		<plugins>
+			<plugin>
+				<groupId>org.springframework.boot</groupId>
+				<artifactId>spring-boot-maven-plugin</artifactId>
+			</plugin>
+		</plugins>
+	</build>
+
+</project>

2.1.x/chapter3-3/src/main/java/com/didispace/chapter33/Chapter33Application.java

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+package com.didispace.chapter33;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+@SpringBootApplication
+public class Chapter33Application {
+
+	public static void main(String[] args) {
+		SpringApplication.run(Chapter33Application.class, args);
+	}
+
+	@RestController
+	static class TextController {
+
+		@GetMapping("/hello")
+		public String hello() {
+			return "hello world";
+		}
+
+	}
+
+}

2.1.x/chapter3-3/src/main/java/com/didispace/chapter33/User.java

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+package com.didispace.chapter33;
+
+import lombok.Data;
+import lombok.NoArgsConstructor;
+
+@Data
+@NoArgsConstructor
+public class User {
+
+    private String name;
+    private Integer age;
+
+}

2.1.x/chapter3-3/src/main/java/com/didispace/chapter33/UserController.java

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+package com.didispace.chapter33;
+
+import lombok.AllArgsConstructor;
+import lombok.Data;
+import org.springframework.web.bind.annotation.*;
+
+import java.util.List;
+
+/**
+ * Created by 程序猿DD/翟永超 on 2020/2/8.
+ * <p>
+ * Blog: http://blog.didispace.com/
+ * Github: https://github.com/dyc87112/
+ */
+@Data
+@AllArgsConstructor
+@RestController
+public class UserController {
+
+    private UserService userService;
+
+    @PostMapping("/user")
+    public int create(@RequestBody User user) {
+        return userService.create(user.getName(), user.getAge());
+    }
+
+    @GetMapping("/user/{name}")
+    public List<User> getByName(@PathVariable String name) {
+        return userService.getByName(name);
+    }
+
+    @DeleteMapping("/user/{name}")
+    public int deleteByName(@PathVariable String name) {
+        return userService.deleteByName(name);
+    }
+
+    @GetMapping("/user/count")
+    public int getAllUsers() {
+        return userService.getAllUsers();
+    }
+
+    @DeleteMapping("/user/all")
+    public int deleteAllUsers() {
+        return userService.deleteAllUsers();
+    }
+
+}

2.1.x/chapter3-3/src/main/java/com/didispace/chapter33/UserService.java

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+package com.didispace.chapter33;
+
+import java.util.List;
+
+public interface UserService {
+
+    /**
+     * 新增一个用户
+     *
+     * @param name
+     * @param age
+     */
+    int create(String name, Integer age);
+
+    /**
+     * 根据name查询用户
+     *
+     * @param name
+     * @return
+     */
+    List<User> getByName(String name);
+
+    /**
+     * 根据name删除用户
+     *
+     * @param name
+     */
+    int deleteByName(String name);
+
+    /**
+     * 获取用户总量
+     */
+    int getAllUsers();
+
+    /**
+     * 删除所有用户
+     */
+    int deleteAllUsers();
+
+}

2.1.x/chapter3-3/src/main/java/com/didispace/chapter33/UserServiceImpl.java

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+package com.didispace.chapter33;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.jdbc.core.JdbcTemplate;
+import org.springframework.jdbc.core.RowMapper;
+import org.springframework.stereotype.Service;
+
+import java.sql.ResultSet;
+import java.sql.SQLException;
+import java.util.List;
+
+@Service
+public class UserServiceImpl implements UserService {
+
+    private JdbcTemplate jdbcTemplate;
+
+    UserServiceImpl(JdbcTemplate jdbcTemplate) {
+        this.jdbcTemplate = jdbcTemplate;
+    }
+
+    @Override
+    public int create(String name, Integer age) {
+        return jdbcTemplate.update("insert into USER(NAME, AGE) values(?, ?)", name, age);
+    }
+
+    @Override
+    public List<User> getByName(String name) {
+        List<User> users = jdbcTemplate.query("select NAME, AGE from USER where NAME = ?", (resultSet, i) -> {
+            User user = new User();
+            user.setName(resultSet.getString("NAME"));
+            user.setAge(resultSet.getInt("AGE"));
+            return user;
+        }, name);
+        return users;
+    }
+
+    @Override
+    public int deleteByName(String name) {
+        return jdbcTemplate.update("delete from USER where NAME = ?", name);
+    }
+
+    @Override
+    public int getAllUsers() {
+        return jdbcTemplate.queryForObject("select count(1) from USER", Integer.class);
+    }
+
+    @Override
+    public int deleteAllUsers() {
+        return jdbcTemplate.update("delete from USER");
+    }
+
+}

2.1.x/chapter3-3/src/main/resources/application.properties

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+
+# 基础配置
+spring.datasource.druid.url=jdbc:mysql://localhost:3306/test
+spring.datasource.druid.username=root
+spring.datasource.druid.password=
+spring.datasource.druid.driver-class-name=com.mysql.cj.jdbc.Driver
+
+# 连接池配置
+spring.datasource.druid.initialSize=10
+spring.datasource.druid.maxActive=20
+spring.datasource.druid.maxWait=60000
+spring.datasource.druid.minIdle=1
+spring.datasource.druid.timeBetweenEvictionRunsMillis=60000
+spring.datasource.druid.minEvictableIdleTimeMillis=300000
+spring.datasource.druid.testWhileIdle=true
+spring.datasource.druid.testOnBorrow=true
+spring.datasource.druid.testOnReturn=false
+spring.datasource.druid.poolPreparedStatements=true
+spring.datasource.druid.maxOpenPreparedStatements=20
+spring.datasource.druid.validationQuery=SELECT 1
+spring.datasource.druid.validation-query-timeout=500
+spring.datasource.druid.filters=stat,wall
+
+# 监控配置
+spring.datasource.druid.stat-view-servlet.enabled=true
+spring.datasource.druid.stat-view-servlet.url-pattern=/druid/*
+spring.datasource.druid.stat-view-servlet.reset-enable=true
+spring.datasource.druid.stat-view-servlet.login-username=admin
+spring.datasource.druid.stat-view-servlet.login-password=admin

2.1.x/chapter3-3/src/test/java/com/didispace/chapter33/Chapter33ApplicationTests.java

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+package com.didispace.chapter33;
+
+import lombok.extern.slf4j.Slf4j;
+import org.junit.Assert;
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.http.MediaType;
+import org.springframework.test.annotation.Rollback;
+import org.springframework.test.context.junit4.SpringRunner;
+import org.springframework.test.web.servlet.MockMvc;
+import org.springframework.test.web.servlet.RequestBuilder;
+import org.springframework.test.web.servlet.setup.MockMvcBuilders;
+import org.springframework.transaction.annotation.Transactional;
+
+import javax.sql.DataSource;
+import java.util.List;
+
+import static org.hamcrest.Matchers.equalTo;
+import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.*;
+import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.content;
+import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.status;
+
+@Slf4j
+@RunWith(SpringRunner.class)
+@SpringBootTest
+public class Chapter33ApplicationTests {
+
+    @Autowired
+    private UserService userSerivce;
+
+    @Autowired
+    private DataSource dataSource;
+
+    @Before
+    public void setUp() {
+        // 准备，清空user表
+        userSerivce.deleteAllUsers();
+
+    }
+
+    @Test
+    public void test() throws Exception {
+        // 插入5个用户
+        userSerivce.create("Tom", 10);
+        userSerivce.create("Mike", 11);
+        userSerivce.create("Didispace", 30);
+        userSerivce.create("Oscar", 21);
+        userSerivce.create("Linda", 17);
+
+        // 查询名为Oscar的用户，判断年龄是否匹配
+        List<User> userList = userSerivce.getByName("Oscar");
+        Assert.assertEquals(21, userList.get(0).getAge().intValue());
+
+        // 查数据库，应该有5个用户
+        Assert.assertEquals(5, userSerivce.getAllUsers());
+
+        // 删除两个用户
+        userSerivce.deleteByName("Tom");
+        userSerivce.deleteByName("Mike");
+
+        // 查数据库，应该有5个用户
+        Assert.assertEquals(3, userSerivce.getAllUsers());
+
+    }
+
+}