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SpringBoot整合JDBC、Druid數(shù)據(jù)源的示例代碼

更新時(shí)間：2021年05月12日 08:24:10 作者：人無名，則可專心練劍

這篇文章主要介紹了SpringBoot整合JDBC、Druid數(shù)據(jù)源,本文通過實(shí)例代碼給大家介紹的非常詳細(xì)，對(duì)大家的學(xué)習(xí)或工作具有一定的參考借鑒價(jià)值，需要的朋友可以參考下

1.SpringBoot整合JDBCTemplate

1.1.導(dǎo)入jdbc相關(guān)依賴包

主要的依賴包：

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-jdbc</artifactId>
</dependency>

<dependency>
    <groupId>mysql</groupId>
    <artifactId>mysql-connector-java</artifactId>
    <scope>runtime</scope>
</dependency>

<!--實(shí)現(xiàn)web頁面接口調(diào)用-->
<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-web</artifactId>
</dependency>

1.2.yaml配置數(shù)據(jù)源

application.yml用于連接jdbc數(shù)據(jù)庫操作數(shù)據(jù)源配置，這里是最簡化的配置：

spring:
  datasource:
    username: root
    password: admin
    #假如時(shí)區(qū)報(bào)錯(cuò)，增加時(shí)區(qū)配置serverTimezone=UTC，以及編碼配置
    url: jdbc:mysql://localhost:3306/mybatis02_0322?serverTimezone=UTC&useUnicode=true&characterEncoding=utf-8
    driver-class-name: com.mysql.cj.jdbc.Driver

實(shí)際開發(fā)過程中基本上會(huì)與Druid、C3P0整合，下面也給出了整合Druid數(shù)據(jù)源相關(guān)的配置，所以這里一并放上完整的application.yml配置：

spring:
  datasource:
    username: root
    password: admin
    #假如時(shí)區(qū)報(bào)錯(cuò)，增加時(shí)區(qū)配置serverTimezone=UTC
    url: jdbc:mysql://localhost:3306/mybatis02_0322?serverTimezone=UTC&useUnicode=true&characterEncoding=utf-8
    driver-class-name: com.mysql.cj.jdbc.Driver
    type: com.alibaba.druid.pool.DruidDataSource

    #springboot 默認(rèn)是不注入這些屬性值的，需要自己綁定
    #druid 數(shù)據(jù)源專有配置
    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

    #配置監(jiān)控統(tǒng)計(jì)攔截的filters，stat：監(jiān)控統(tǒng)計(jì)、log4j：日志記錄、wall：防止sql注入
    #如果允許時(shí)報(bào)錯(cuò)：java.lang.ClassNotFoundException:org.apache.log4j.Priority
    #則導(dǎo)入 log4j 依賴即可，maven地址：https://mvnrepository.com/artifact/log4j/log4j
    filters: stat,wall,log4j
    maxPoolPreparedStatementPerConnectionSize: 20
    useGlobalDataSourceStat: true
    connectionProperties: druid.stat.mergeSql=true;druid.stat.slowSqlMillis=500

最后測試一下數(shù)據(jù)庫連接訪問是否成功：

@SpringBootTest
class SpringbootDataApplicationTests {
    @Autowired
    private DataSource dataSource;

    @Test
    void testConnection() throws SQLException {
        System.out.println(dataSource.getClass());
        Connection connection = dataSource.getConnection();
        System.out.println(connection);
    }
}

打印成功，顯示獲取到了數(shù)據(jù)源信息：

1.3.界面訪問接口測試

@RestController
public class JDBCController {
    @Autowired
    private JdbcTemplate jdbcTemplate;

    @RequestMapping("/queryList")
    public List<Map<String, Object>> query() {
        String sql = "select * from user";
        List<Map<String, Object>> queryForList = jdbcTemplate.queryForList(sql);
        return queryForList;
    }

    @RequestMapping("/addUser")
    public String AddUser(){
        String sql = "insert into mybatis02_0322.user(id, username, password) values(4, '李磊', '654321')";
        int update = jdbcTemplate.update(sql);
        return "AddUser Ok";
    }

    @RequestMapping("/update/{id}")
    public String update(@PathVariable("id") Integer id){
        String sql = "update mybatis02_0322.user set username = ?, password = ? where id = " + id;
        Object[] objects = new Object[2];
        objects[0] = "測試哈哈哈111";
        objects[1] = "32321";
        int update = jdbcTemplate.update(sql, objects);
        return "updateUser Ok";
    }

    @RequestMapping("/delete/{id}")
    public String delete(@PathVariable("id") Integer id){
        String sql = "delete from mybatis02_0322.user where id = " + id;
        int update = jdbcTemplate.update(sql);
        return "delete Ok";
    }
}

這里對(duì)應(yīng)接口請(qǐng)求頁面進(jìn)行請(qǐng)求測試即可，后臺(tái)數(shù)據(jù)庫層面進(jìn)行驗(yàn)證，比較簡單，這里就不一一細(xì)說，對(duì)應(yīng)可以去看我的源碼。

2.SpringBoot整合DruidDataSource

2.1.Druid簡介

Druid是阿里巴巴開源平臺(tái)上一個(gè)數(shù)據(jù)庫連接池實(shí)現(xiàn)，它結(jié)合了C3P0、DBCP、PROXOOL等DB池的優(yōu)秀實(shí)踐，同時(shí)加入了日志監(jiān)控。

Druid可以很好地監(jiān)控DB池連接和Sql的執(zhí)行情況，是天生針對(duì)監(jiān)控的DB連接池。

SpringBoot2.0以上默認(rèn)使用Hikari數(shù)據(jù)源，可以說HiKari和Druid都是當(dāng)前Java Web上開源的優(yōu)秀數(shù)據(jù)源。

2.2.導(dǎo)入Druid相關(guān)依賴

對(duì)應(yīng)pom.xml文件：

<!--整合alibaba druid數(shù)據(jù)源-->
<dependency>
    <groupId>com.alibaba</groupId>
    <artifactId>druid</artifactId>
    <version>1.2.3</version>
</dependency>
<!--導(dǎo)入log4j日志包-->
<dependency>
    <groupId>log4j</groupId>
    <artifactId>log4j</artifactId>
    <version>1.2.17</version>
</dependency>

2.3.配置Druid并使用監(jiān)控頁面

①編寫DruidConfig類，啟用后臺(tái)監(jiān)控功能Bean以及過濾器Bean：

@Configuration
public class DruidConfig {

    @ConfigurationProperties(prefix = "spring.datasource")
    @Bean
    public DataSource druidDataSource(){
        return new DruidDataSource();
    }

    //后臺(tái)監(jiān)控功能
    @Bean
    public ServletRegistrationBean statViewServlet(){
        ServletRegistrationBean<StatViewServlet> bean = new ServletRegistrationBean<>(new StatViewServlet(), "/druid/*");
        //后臺(tái)需要有人登陸，賬號(hào)密碼配置
        HashMap<String, String> initParameters = new HashMap<>();
        initParameters.put("loginUsername", "admin");  //登陸key，是固定的  loginUsername loginPassword
        initParameters.put("loginPassword", "123456");
        //允許誰可以訪問
        initParameters.put("allow", "");
        //禁止誰可以訪問   initParameters.put("fengye", "192.168.1.10");
        bean.setInitParameters(initParameters);     //設(shè)置初始化參數(shù)

        return bean;
    }

    //過濾器
    @Bean
    public FilterRegistrationBean webStatFilter(){
        FilterRegistrationBean<Filter> bean = new FilterRegistrationBean<>();
        bean.setFilter(new WebStatFilter());

        HashMap<String, String> initParameters = new HashMap<>();
        //這些不進(jìn)行統(tǒng)計(jì)
        initParameters.put("exclusions", "*.js,*.css,/druid/*");
        bean.setInitParameters(initParameters);

        return bean;
    }
}

②啟動(dòng)頁面訪問Druid并測試請(qǐng)求訪問sql：

本博客寫作參考文檔相關(guān)：

https://docs.spring.io/spring-boot/docs/current/reference/htmlsingle/#using-boot-starter

https://www.yuque.com/atguigu/springboot/aob431#wtNk1

Spring Boot 2 學(xué)習(xí)筆記（上）：https://blog.csdn.net/u011863024/article/details/113667634
Spring Boot 2 學(xué)習(xí)筆記（下）：
https://blog.csdn.net/u011863024/article/details/113667946

示例代碼已上傳至Github地址：

https://github.com/devyf/SpringBoot_Study

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