439 lines
15 KiB
Markdown
439 lines
15 KiB
Markdown
# spring +druid+ mybatis（xml配置方式）
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#### 1、创建标准web maven工程，导入依赖
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```xml
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<?xml version="1.0" encoding="UTF-8"?>
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<project xmlns="http://maven.apache.org/POM/4.0.0"
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xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
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<modelVersion>4.0.0</modelVersion>
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<groupId>com.heibaiying</groupId>
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<artifactId>spring-jdbc</artifactId>
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<version>1.0-SNAPSHOT</version>
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<properties>
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<spring-base-version>5.1.3.RELEASE</spring-base-version>
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</properties>
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<dependencies>
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<dependency>
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<groupId>org.springframework</groupId>
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<artifactId>spring-context</artifactId>
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<version>${spring-base-version}</version>
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</dependency>
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<dependency>
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<groupId>org.springframework</groupId>
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<artifactId>spring-beans</artifactId>
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<version>${spring-base-version}</version>
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</dependency>
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<dependency>
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<groupId>org.springframework</groupId>
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<artifactId>spring-core</artifactId>
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<version>${spring-base-version}</version>
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</dependency>
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<dependency>
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<groupId>org.springframework</groupId>
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<artifactId>spring-web</artifactId>
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<version>${spring-base-version}</version>
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</dependency>
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<dependency>
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<groupId>org.springframework</groupId>
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<artifactId>spring-webmvc</artifactId>
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<version>${spring-base-version}</version>
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</dependency>
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<dependency>
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<groupId>javax.servlet</groupId>
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<artifactId>javax.servlet-api</artifactId>
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<version>4.0.1</version>
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<scope>provided</scope>
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</dependency>
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<dependency>
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<groupId>org.projectlombok</groupId>
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<artifactId>lombok</artifactId>
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<version>1.18.4</version>
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<scope>provided</scope>
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</dependency>
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<!--jdbc 相关依赖包-->
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<dependency>
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<groupId>org.springframework</groupId>
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<artifactId>spring-jdbc</artifactId>
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<version>${spring-base-version}</version>
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</dependency>
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<dependency>
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<groupId>mysql</groupId>
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<artifactId>mysql-connector-java</artifactId>
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<version>8.0.13</version>
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</dependency>
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<!--单元测试相关依赖包-->
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<dependency>
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<groupId>junit</groupId>
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<artifactId>junit</artifactId>
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<version>4.12</version>
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<scope>test</scope>
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</dependency>
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<dependency>
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<groupId>org.springframework</groupId>
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<artifactId>spring-test</artifactId>
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<version>${spring-base-version}</version>
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<scope>test</scope>
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</dependency>
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<dependency>
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<groupId>com.oracle</groupId>
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<artifactId>ojdbc6</artifactId>
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<version>11.2.0.3.0</version>
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</dependency>
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<!--mybatis 依赖包-->
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<dependency>
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<groupId>org.mybatis</groupId>
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<artifactId>mybatis-spring</artifactId>
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<version>1.3.2</version>
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</dependency>
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<dependency>
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<groupId>org.mybatis</groupId>
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<artifactId>mybatis</artifactId>
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<version>3.4.6</version>
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</dependency>
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<!--druid 依赖-->
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<dependency>
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<groupId>com.alibaba</groupId>
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<artifactId>druid</artifactId>
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<version>1.1.12</version>
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</dependency>
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</dependencies>
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</project>
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```
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#### 2、在web.xml 进行如下配置
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```xml
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<?xml version="1.0" encoding="UTF-8"?>
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<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
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xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee
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http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"
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version="3.1">
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<!--配置spring前端控制器-->
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<servlet>
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<servlet-name>springMvc</servlet-name>
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<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
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<init-param>
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<param-name>contextConfigLocation</param-name>
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<param-value>classpath:springApplication.xml</param-value>
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</init-param>
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<load-on-startup>1</load-on-startup>
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</servlet>
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<servlet-mapping>
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<servlet-name>springMvc</servlet-name>
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<url-pattern>/</url-pattern>
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</servlet-mapping>
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<!-- 配置 Druid 监控信息显示页面 访问地址 <a href="http://localhost:8080/druid/index.html"> -->
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<servlet>
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<servlet-name>DruidStatView</servlet-name>
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<servlet-class>com.alibaba.druid.support.http.StatViewServlet</servlet-class>
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<init-param>
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<!-- 允许清空统计数据 -->
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<param-name>resetEnable</param-name>
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<param-value>true</param-value>
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</init-param>
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<init-param>
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<!-- 用户名 -->
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<param-name>loginUsername</param-name>
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<param-value>druid</param-value>
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</init-param>
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<init-param>
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<!-- 密码 -->
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<param-name>loginPassword</param-name>
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<param-value>druid</param-value>
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</init-param>
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</servlet>
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<servlet-mapping>
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<servlet-name>DruidStatView</servlet-name>
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<url-pattern>/druid/*</url-pattern>
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</servlet-mapping>
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<!--配置WebStatFilter用于采集web-jdbc关联监控的数据-->
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<filter>
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<filter-name>DruidWebStatFilter</filter-name>
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<filter-class>com.alibaba.druid.support.http.WebStatFilter</filter-class>
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<init-param>
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<param-name>exclusions</param-name>
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<param-value>*.js,*.gif,*.jpg,*.png,*.css,*.ico,/druid/*</param-value>
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</init-param>
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</filter>
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<filter-mapping>
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<filter-name>DruidWebStatFilter</filter-name>
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<url-pattern>/*</url-pattern>
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</filter-mapping>
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</web-app>
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```
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#### 3、在resources文件夹下新建数据库配置文件jdbc.properties
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```properties
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# mysql 数据库配置
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mysql.url=jdbc:mysql://localhost:3306/mysql
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mysql.username=root
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mysql.password=root
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# oracle 数据库配置
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oracle.url=jdbc:oracle:thin:@//IP地址:端口号/数据库实例名
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oracle.username=用户名
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oracle.password=密码
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```
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4、在resources文件夹下创建springApplication.xml 配置文件和druid.xml配置文件
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```xml
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<?xml version="1.0" encoding="UTF-8"?>
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<beans xmlns="http://www.springframework.org/schema/beans"
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xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xmlns:context="http://www.springframework.org/schema/context" xmlns:tx="http://www.springframework.org/schema/tx"
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xmlns:mvc="http://www.springframework.org/schema/mvc"
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xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
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http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.1.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd">
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<!-- 开启注解包扫描-->
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<context:component-scan base-package="com.heibaiying.*"/>
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<!--使用默认的Servlet来响应静态文件 -->
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<mvc:default-servlet-handler/>
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<!-- 开启注解驱动-->
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<mvc:annotation-driven/>
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<!--引入druid.xml配置 由于druid 的可配置项比较多，所以可以单独拆分为一个配置文件-->
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<import resource="druid.xml"/>
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<!--配置 mybatis 会话工厂 -->
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<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
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<property name="dataSource" ref="dataSource"/>
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<!--指定mapper文件所在的位置-->
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<property name="mapperLocations" value="classpath*:/mappers/**/*.xml"/>
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<property name="configLocation" value="classpath:mybatisConfig.xml"/>
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</bean>
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<!--扫描注册接口 -->
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<!--作用:从接口的基础包开始递归搜索，并将它们注册为 MapperFactoryBean(只有至少一种方法的接口才会被注册;, 具体类将被忽略)-->
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<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
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<!--指定会话工厂 -->
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<property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"/>
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<!-- 指定mybatis接口所在的包 -->
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<property name="basePackage" value="com.heibaiying.dao"/>
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</bean>
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<!--定义事务管理器-->
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<bean id="transactionManager"
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class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
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<property name="dataSource" ref="dataSource"/>
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</bean>
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<!-- 开启事务注解@Transactional支持 -->
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<tx:annotation-driven/>
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</beans>
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```
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```xml
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<?xml version="1.0" encoding="UTF-8"?>
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<beans xmlns="http://www.springframework.org/schema/beans"
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xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xmlns:context="http://www.springframework.org/schema/context"
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xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
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http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.1.xsd">
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<!--指定配置文件的位置-->
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<context:property-placeholder location="classpath:jdbc.properties"/>
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<!--配置druid数据源 关于更多的配置项 可以参考官方文档 <a src="https://github.com/alibaba/druid/wiki/DruidDataSource%E9%85%8D%E7%BD%AE%E5%B1%9E%E6%80%A7%E5%88%97%E8%A1%A8" > -->
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<bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource" init-method="init" destroy-method="close">
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<!-- 基本属性 url、user、password -->
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<property name="url" value="${mysql.url}"/>
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<property name="username" value="${mysql.username}"/>
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<property name="password" value="${mysql.password}"/>
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<!-- 配置初始化大小、最小、最大连连接数量 -->
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<property name="initialSize" value="5"/>
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<property name="minIdle" value="10"/>
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<property name="maxActive" value="20"/>
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<!-- 配置获取连接等待超时的时间 -->
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<property name="maxWait" value="60000"/>
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<!-- 配置间隔多久才进行一次检测，检测需要关闭的空闲连接，单位是毫秒 -->
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<property name="timeBetweenEvictionRunsMillis" value="2000"/>
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<!-- 配置一个连接在池中最小生存的时间，单位是毫秒 -->
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<property name="minEvictableIdleTimeMillis" value="600000"/>
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<!-- 配置一个连接在池中最大生存的时间，单位是毫秒 -->
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<property name="maxEvictableIdleTimeMillis" value="900000"/>
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<!--validationQuery 用来检测连接是否有效的sql，要求是一个查询语句，常用select 'x'。
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但是在 oracle 数据库下需要写成 select 'x' from dual 不然实例化数据源的时候就会失败,
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这是由于oracle 和 mysql 语法间的差异造成的-->
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<property name="validationQuery" value="select 'x'"/>
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<!--建议配置为true，不影响性能，并且保证安全性。申请连接的时候检测，
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如果空闲时间大于timeBetweenEvictionRunsMillis，执行validationQuery检测连接是否有效。-->
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<property name="testWhileIdle" value="true"/>
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<!--申请连接时执行validationQuery检测连接是否有效，做了这个配置会降低性能。-->
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<property name="testOnBorrow" value="false"/>
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<!--归还连接时执行validationQuery检测连接是否有效，做了这个配置会降低性能。-->
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<property name="testOnReturn" value="false"/>
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<!--连接池中的minIdle数量以内的连接，空闲时间超过minEvictableIdleTimeMillis，则会执行keepAlive操作。-->
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<property name="keepAlive" value="true"/>
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<property name="phyMaxUseCount" value="100000"/>
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<!-- 配置监控统计拦截的filters Druid连接池的监控信息主要是通过StatFilter 采集的，
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采集的信息非常全面，包括SQL执行、并发、慢查、执行时间区间分布等-->
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<property name="filters" value="stat"/>
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</bean>
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</beans>
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```
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#### 5、新建mybtais 配置文件 更多settings配置项可以参考[官方文档](http://www.mybatis.org/mybatis-3/zh/configuration.html)
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```xml
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<?xml version="1.0" encoding="UTF-8" ?>
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<!DOCTYPE configuration
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PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
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"http://mybatis.org/dtd/mybatis-3-config.dtd">
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<!-- mybatis 配置文件 -->
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<configuration>
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<settings>
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<!-- 开启驼峰命名 -->
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<setting name="mapUnderscoreToCamelCase" value="true"/>
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<!-- 打印查询sql -->
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<setting name="logImpl" value="STDOUT_LOGGING"/>
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</settings>
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</configuration>
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<!--更多settings配置项可以参考官方文档: <a href="http://www.mybatis.org/mybatis-3/zh/configuration.html"/>-->
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```
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#### 6、新建查询接口及其对应的mapper文件
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```java
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public interface MysqlDao {
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List<Relation> get();
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}
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```
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```xml
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<!DOCTYPE mapper
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PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
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"http://mybatis.org/dtd/mybatis-3-mapper.dtd">
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<mapper namespace="com.heibaiying.dao.MysqlDao">
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<select id="queryById" resultType="com.heibaiying.bean.Relation">
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SELECT help_keyword_id AS id,name
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FROM HELP_KEYWORD
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WHERE HELP_KEYWORD_ID = #{id}
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</select>
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</mapper>
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```
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```mysql
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public interface OracleDao {
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List<Flow> queryById(long id);
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}
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```
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```xml
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<!DOCTYPE mapper
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PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
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"http://mybatis.org/dtd/mybatis-3-mapper.dtd">
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<mapper namespace="com.heibaiying.dao.OracleDao">
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<select id="queryById" resultType="com.heibaiying.bean.Flow">
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select * from APEX_030200.WWV_FLOW_CALS where ID = #{id}
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</select>
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</mapper>
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```
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#### 7.新建测试controller进行测试
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```java
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package com.heibaiying.controller;
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import com.heibaiying.bean.Relation;
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import com.heibaiying.dao.MysqlDao;
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import org.springframework.beans.factory.annotation.Autowired;
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import org.springframework.web.bind.annotation.GetMapping;
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import org.springframework.web.bind.annotation.PathVariable;
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import org.springframework.web.bind.annotation.RestController;
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import java.util.List;
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/**
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* @author : heibaiying
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* @description :
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*/
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@RestController
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public class MysqlController {
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@Autowired
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private MysqlDao mysqlDao;
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@GetMapping("relation/{id}")
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public String get(@PathVariable(name = "id") String id) {
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return mysqlDao.queryById(id).get(0).toString();
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}
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}
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```
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```java
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package com.heibaiying.controller;
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import com.heibaiying.dao.OracleDao;
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import org.springframework.beans.factory.annotation.Autowired;
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import org.springframework.web.bind.annotation.GetMapping;
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import org.springframework.web.bind.annotation.PathVariable;
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import org.springframework.web.bind.annotation.RestController;
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/**
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* @author : heibaiying
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* @description :
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*/
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@RestController
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public class OracleController {
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@Autowired
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private OracleDao oracleDao;
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@GetMapping("flow/{id}")
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public String get(@PathVariable(name = "id") Long id) {
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return oracleDao.queryById(id).get(0).toString();
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}
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}
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```
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#### 8、druid 监控页面访问地址http://localhost:8080/druid/index.html
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