Spring学习笔记(06-使用JDBC模板对象、JUnit测试、读取配置文件)

1.使用IntelliJ IDEA创建maven工程，添加如下依赖

<?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>

    <groupId>com.xiao</groupId>
    <artifactId>spring_03</artifactId>
    <version>1.0-SNAPSHOT</version>

    <dependencies>

        <!-- spring-core -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-core</artifactId>
            <version>4.2.5.RELEASE</version>
        </dependency>

        <!-- spring-context -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context</artifactId>
            <version>4.2.5.RELEASE</version>
        </dependency>

        <!-- spring-beans -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-beans</artifactId>
            <version>4.2.5.RELEASE</version>
        </dependency>

        <!-- spring-expression -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-expression</artifactId>
            <version>4.2.5.RELEASE</version>
        </dependency>

        <!-- spring-jdbc -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-jdbc</artifactId>
            <version>4.2.4.RELEASE</version>
        </dependency>

        <!-- spring-tx -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-tx</artifactId>
            <version>4.2.4.RELEASE</version>
        </dependency>

        <!-- spring-test -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-test</artifactId>
            <version>4.2.4.RELEASE</version>
        </dependency>

        <!-- mysql驱动 -->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.45</version>
        </dependency>

        <!-- c3p0连接池-->
        <dependency>
            <groupId>c3p0</groupId>
            <artifactId>c3p0</artifactId>
            <version>0.9.1.2</version>
        </dependency>

        <!-- JUnit测试 -->
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.12</version>
        </dependency>

    </dependencies>

</project>

工程目录如下

2.书写spring核心配置文件applicationContext.xml文件

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	   xmlns="http://www.springframework.org/schema/beans"
	   xmlns:context="http://www.springframework.org/schema/context"
	   xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.2.xsd
						   http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.2.xsd">


	<!-- 读取外部数据库连接信息的配置文件 -->
	<context:property-placeholder location="classpath:jdbc.properties" />

	<!-- 配置c3p0连接池对象，将其交由Spring容器管理，并注入数据库连接信息 -->
	<bean name="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
		<property name="jdbcUrl" 	   value="${jdbc.url}"></property>
		<property name="driverClass"       value="${jdbc.driver}"></property>
		<property name="user"		   value="${jdbc.username}"></property>
		<property name="password"	   value="${jdbc.password}"></property>
	</bean>

	<!-- 配置JDBC模板对象，将其交由Spring容器管理 -->
	<bean name="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate">
		<!-- 注入连接池对象 -->
		<property name="dataSource" ref="dataSource"></property>
	</bean>

</beans>

3.数据库连接信息配置文件jdbc.properties

jdbc.driver=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/demo?characterEncoding=utf-8
jdbc.username=root
jdbc.password=root

4.User实体类

package com.xiao.pojo;

/**
 * @Author 笑笑
 * @Date 20:01 2018/06/05
 */
public class User {

    private int id;

    private String username;

    private String password;


    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public String getUsername() {
        return username;
    }

    public void setUsername(String username) {
        this.username = username;
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }

    @Override
    public String toString() {
        return "User{" +
                "id=" + id +
                ", username='" + username + '\'' +
                ", password='" + password + '\'' +
                '}';
    }
}

5.在UserDao中进行测试

package com.xiao.dao;

import com.xiao.pojo.User;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.jdbc.core.RowMapper;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.List;
/**
 * @Author 笑笑
 * @Date 20:31 2018/06/05
 */
//Spring使用JUnit测试
//创建容器
@RunWith(SpringJUnit4ClassRunner.class)
//指定配置文件路径
@ContextConfiguration("classpath:applicationContext.xml")
public class UserDao {

    //自动注入JDBC模板对象
    @Autowired
    private JdbcTemplate jdbcTemplate;

    @Test
    public void getAllUser(){

        String sql = "select * from tb_user";

        List<User> userList = jdbcTemplate.query(sql, new RowMapper<User>() {

            @Override
            public User mapRow(ResultSet rs, int rowNum) throws SQLException {
                User user = new User();
                user.setId(rs.getInt("id"));
                user.setUsername(rs.getString("username"));
                user.setPassword(rs.getString("password"));
                return user;
            }
        });
        System.out.println(userList);
    }



}

运行测试类，输出结果如下

对应数据库信息如下