使用maven 一步一步搭建Spring+mybatis環境
阿新 • • 發佈:2019-02-08
本文章適合初學者學習 spring mybatis的一個操作 指導
首先看一下專案整體架構
看看這個專案是不是你想要的如果不是,就不用跟我這篇部落格浪費時間了
- 從spring的配置檔案開始講起
applicationConetxt.xml
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:context ="http://www.springframework.org/schema/context"
xmlns:aop="http://www.springframework.org/schema/aop"
xmlns:p="http://www.springframework.org/schema/p"
xmlns:tx="http://www.springframework.org/schema/tx"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
http://www.springframework.org/schema/aop
http://www.springframework.org/schema/aop/spring-aop-3.0.xsd
http://www.springframework.org/schema/tx
http://www.springframework.org/schema/tx/spring-tx-3.0.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-3.0.xsd" >
<!-- 1.採用註釋的方式配置bean -->
<context:annotation-config />
<!-- 2.配置要掃描的包 -->
<context:component-scan base-package="com.l"></context:component-scan>
<!-- 3.載入 jdbc.properties 配置檔案 -->
<bean
class ="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
<property name="locations">
<list>
<value>classpath:jdbc.properties</value>
</list>
</property>
</bean>
<!-- 4.配置資料來源 這裡用的是阿里巴巴的德魯伊 也可以配置成別的 -->
<bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource"
destroy-method="close" init-method="init" p:driverClassName="${jdbc.driverClassName}"
p:url="${jdbc.url}" p:connectionProperties="druid.stat.slowSqlMillis=1000;druid.stat.logSlowSql=true"
p:username="${jdbc.name}" p:password="${jdbc.pass}" p:minIdle="30"
p:maxActive="200" p:poolPreparedStatements="true"
p:maxPoolPreparedStatementPerConnectionSize="20" p:initialSize="100"
p:maxWait="60000" p:testWhileIdle="true" p:validationQuery="select 1"
p:timeBetweenEvictionRunsMillis="60000" >
<description>資料來源配置</description>
</bean>
<!-- 5.Session工廠 -->
<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
<property name="dataSource" ref="dataSource" />
<!-- mybatis配置檔案 -->
<property name="configLocation" value="classpath:mybatis.xml" />
</bean>
<!-- 6. 配置SqlSessionTemplate 為了程式中呼叫使用-->
<bean id="sqlSessionTemplate" class="org.mybatis.spring.SqlSessionTemplate">
<constructor-arg name="sqlSessionFactory" ref="sqlSessionFactory" />
</bean>
</beans>
- mybatis的配置檔案
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE configuration PUBLIC "-//mybatis.org//DTD Config 3.0//EN" "http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
<!--指定別名 -->
<typeAliases>
<typeAlias alias="personal" type="com.l.models.User"/>
</typeAliases>
<!-- 指定對映檔案 這個檔案就是你sql指令碼所在的檔案 可以配置多個 -->
<mappers>
<mapper resource="sqlmap/Usersmapping.xml" />
</mappers>
</configuration>
- Usersmapping.xml
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper
PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<!--名稱空間可以指向具體的 dao介面這樣可以不寫實現類自動呼叫 -->
<mapper namespace="com.darren.daointerface">
<cache />
<select id="queryById" resultType="personal" parameterType="int">
SELECT
UID,
USERNAME,
PASSWORD
FROM USERS
WHERE UID = #{id}
</select>
</mapper>
- QuerUser.java
這個就是個servlet 測試用的 模擬頁面上點選一個按鈕
就是從 spring 的容器裡面 拿出來一個 service
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
ServletContext servletContext = this.getServletContext();
WebApplicationContext context = WebApplicationContextUtils.getWebApplicationContext(servletContext);
UserService user= (UserService) context.getBean("userService");
user.queryone(1);
}
- UserServiceImpl.java
UserService 這個介面就不寫了,這裡起了個名字 跟上述servelet相呼應上
注入進去了一個Dao層,呼叫方法 在控制檯輸出結果
package com.l.service;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import com.l.daointerface.UserDao;
import com.l.models.User;
@Service(value="userService")
public class UserServiceImpl implements UserService {
@Autowired
UserDao userDao;
public void queryone(int id) {
System.out.println("開始查詢 " + id);
User usr = userDao.queryById(id);
System.out.println(usr.toString());
}
}
- UserDaoImpl
介面就不寫了,把在配置檔案裡面剛剛寫的 template注入進去(spring就是封裝了一個一個 template),之後呼叫selectone方法 ,第一個引數是 sql名字 第二個引數是傳入的引數
@Repository
public class UserDaoImpl implements UserDao {
@Autowired
private SqlSessionTemplate sqlSessionTemplate;
public User queryById(int id) {
return (User) sqlSessionTemplate.selectOne("queryById", id);
}
}
- 測試
我不太喜歡junit 所以就是直接部署在tomcat中 訪問 那個servelet的地址
web.xml
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" version="2.5">
<display-name>Archetype Created Web Application</display-name>
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>
classpath:applicationContext.xml
</param-value>
</context-param>
<listener>
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>
<servlet>
<description></description>
<display-name>QueryUser</display-name>
<servlet-name>QueryUser</servlet-name>
<servlet-class>com.l.controller.QueryUser</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>QueryUser</servlet-name>
<url-pattern>/QueryUser</url-pattern>
</servlet-mapping>
</web-app>
- pom檔案參考
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-core</artifactId>
<version>4.1.4.RELEASE</version>
</dependency>
<!-- 新增spring-context包 -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
<version>4.1.4.RELEASE</version>
</dependency>
<!-- 新增spring-tx包 -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-tx</artifactId>
<version>4.1.4.RELEASE</version>
</dependency>
<!-- 新增spring-jdbc包 -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-jdbc</artifactId>
<version>4.1.4.RELEASE</version>
</dependency>
<!-- 為了方便進行單元測試,新增spring-test包 -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-test</artifactId>
<version>4.1.4.RELEASE</version>
</dependency>
<!--新增spring-web包 -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-web</artifactId>
<version>4.1.4.RELEASE</version>
</dependency>
<!--新增aspectjweaver包 -->
<dependency>
<groupId>org.aspectj</groupId>
<artifactId>aspectjweaver</artifactId>
<version>1.8.5</version>
</dependency>
<!-- 新增mybatis的核心包 -->
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis</artifactId>
<version>3.2.8</version>
</dependency>
<!-- 新增mybatis與Spring整合的核心包 -->
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis-spring</artifactId>
<version>1.2.2</version>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.34</version>
</dependency>
<!-- 新增druid連線池包 -->
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>druid</artifactId>
<version>1.0.12</version>
</dependency>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>jstl</artifactId>
<version>1.2</version>
</dependency>