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解析Spring第四天（Spring中的事物、Spring框架来管理模板类）

JDBC模板技术：
Spring框架中提供了很多持久层的模板类来简化编程，使用模板类编写程序会变的简单
- template 模板
- 都是Spring框架提供XxxTemplate
提供了JDBC模板，Spring框架提供的
- JdbcTemplate类，Connection 表示连接，管理事务 Statement ResultSet
如何使用JDBC模板类？

在数据库中新增表结构和数据

 1 DROP TABLE IF EXISTS `account`;
 2 CREATE TABLE `account` (
 3   `id` int(11) NOT NULL AUTO_INCREMENT,
 4   `name` varchar(40) DEFAULT NULL,
 5   `money` double DEFAULT NULL,
 6   PRIMARY KEY (`id`)
 7 ) ENGINE=InnoDB AUTO_INCREMENT=7 DEFAULT CHARSET=utf8;
 8 
 9 -- ----------------------------
10 -- Records of account
11 -- ----------------------------
12 INSERT INTO `account` VALUES ('1', 'aaa', '1000');
13 INSERT INTO `account` VALUES ('2', 'bbb', '1000');
14 INSERT INTO `account` VALUES ('3', 'ccc', '1000');
15 INSERT INTO `account` VALUES ('4', '熊大', '700');
16 INSERT INTO `account` VALUES ('5', '熊二', '1200');
17 INSERT INTO `account` VALUES ('6', '熊三', '800');

创建一个普通的Maven工程，引入坐标

 1 <dependencies>
 2     <dependency>
 3         <groupId>org.springframework</groupId>
 4         <artifactId>spring-context</artifactId>
 5         <version>5.0.2.RELEASE</version>
 6     </dependency>
 7     <dependency>
 8         <groupId>commons-logging</groupId>
 9         <artifactId>commons-logging</artifactId>
10         <version>1.2</version>
11     </dependency>
12     <dependency>
13         <groupId>log4j</groupId>
14         <artifactId>log4j</artifactId>
15         <version>1.2.12</version>
16     </dependency>
17     <dependency>
18         <groupId>junit</groupId>
19         <artifactId>junit</artifactId>
20         <version>4.12</version>
21     </dependency>
22     <dependency>
23         <groupId>org.springframework</groupId>
24         <artifactId>spring-test</artifactId>
25         <version>5.0.2.RELEASE</version>
26     </dependency>
27     
28     <dependency>
29         <groupId>aopalliance</groupId>
30         <artifactId>aopalliance</artifactId>
31         <version>1.0</version>
32     </dependency>
33     <dependency>
34         <groupId>org.springframework</groupId>
35         <artifactId>spring-aspects</artifactId>
36         <version>5.0.2.RELEASE</version>
37     </dependency>
38     <dependency>
39         <groupId>org.aspectj</groupId>
40         <artifactId>aspectjweaver</artifactId>
41         <version>1.8.13</version>
42     </dependency>
43     <dependency>
44         <groupId>mysql</groupId>
45         <artifactId>mysql-connector-java</artifactId>
46         <version>5.1.6</version>
47     </dependency>
48     <dependency>
49         <groupId>org.springframework</groupId>
50         <artifactId>spring-jdbc</artifactId>
51         <version>5.0.2.RELEASE</version>
52     </dependency>
53     <dependency>
54         <groupId>org.springframework</groupId>
55         <artifactId>spring-tx</artifactId>
56         <version>5.0.2.RELEASE</version>
57     </dependency>
58   </dependencies>

使用Spring框架来管理模板类，Spring管理内置的连接池

 1 <?xml version="1.0" encoding="UTF-8"?>
 2 <beans xmlns="http://www.springframework.org/schema/beans"
 3        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 4        xmlns:context="http://www.springframework.org/schema/context"
 5        xmlns:aop="http://www.springframework.org/schema/aop"
 6        xsi:schemaLocation="
 7                 http://www.springframework.org/schema/beans
 8                 http://www.springframework.org/schema/beans/spring-beans.xsd
 9                 http://www.springframework.org/schema/context
10                 http://www.springframework.org/schema/context/spring-context.xsd
11                 http://www.springframework.org/schema/aop
12                 http://www.springframework.org/schema/aop/spring-aop.xsd">
13 
14     <!--配置连接池-->
15     <bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
16         <property name="driverClassName" value="com.mysql.jdbc.Driver" />
17         <property name="url" value="jdbc:mysql:///spring_db" />
18         <property name="username" value="root" />
19         <property name="password" value="root" />
20     </bean>
21 
22     <!--配置jdbc模板-->
23     <bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate">
24         <property name="dataSource" ref="dataSource" />
25     </bean>
26 
27 </beans>

测试jdbcTemplate

package cn.tx.test;

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.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;


@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(value = "classpath:applicationContext_jdbc.xml")
public class Demo1_1 {

    @Autowired
    private JdbcTemplate jdbcTemplate;

    /**
     * 测试的方式
     */
    @Test
    public void run1(){
        jdbcTemplate.update("insert into account values (null,?,?)","熊二",500);
    }

}

Spring框架管理开源的连接池

配置开源的连接池，使用Druid的连接池，引入坐标

<dependency>
    <groupId>com.alibaba</groupId>
    <artifactId>druid</artifactId>
    <version>1.1.10</version>
</dependency>

新建一个属性文件后缀为.properties。配置连接数据库的基本信息

1 jdbc.driverClassName=com.mysql.jdbc.Driver
2     jdbc.url=jdbc:mysql:///spring_db
3     jdbc.username=root
4     jdbc.password=root

在xml的文件中配置读取属性文件，连接数据库和配置jdbc模板

 1 <?xml version="1.0" encoding="UTF-8"?>
 2 <beans xmlns="http://www.springframework.org/schema/beans"
 3        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 4        xmlns:context="http://www.springframework.org/schema/context"
 5        xmlns:aop="http://www.springframework.org/schema/aop"
 6        xsi:schemaLocation="
 7                 http://www.springframework.org/schema/beans
 8                 http://www.springframework.org/schema/beans/spring-beans.xsd
 9                 http://www.springframework.org/schema/context
10                 http://www.springframework.org/schema/context/spring-context.xsd
11                 http://www.springframework.org/schema/aop
12                 http://www.springframework.org/schema/aop/spring-aop.xsd">
13 
14     <!--配置连接池，使用的是Spring框架内置的连接池
15     <bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
16         <property name="driverClassName" value="com.mysql.jdbc.Driver" />
17         <property name="url" value="jdbc:mysql:///spring_db" />
18         <property name="username" value="root" />
19         <property name="password" value="root" />
20     </bean>
21     -->
22 
23     <!--使用开源连接池
24     <bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource">
25         <property name="driverClassName" value="com.mysql.jdbc.Driver" />
26         <property name="url" value="jdbc:mysql:///spring_db" />
27         <property name="username" value="root" />
28         <property name="password" value="root" />
29     </bean>
30     -->
31 
32     <!--加载属性文件
33     <bean id="placeholderConfigurer" class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
34         <property name="location" value="classpath:jdbc.properties" />
35     </bean>
36     -->
37 
38     <!--第二种写法：使用提供标签的方式-->
39     <context:property-placeholder location="classpath:jdbc.properties" />
40 
41     <!--加载属性的文件-->
42     <bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource">
43         <property name="driverClassName" value="${jdbc.driverClassName}" />
44         <property name="url" value="${jdbc.url}" />
45         <property name="username" value="${jdbc.username}" />
46         <property name="password" value="${jdbc.password}" />
47     </bean>
48 
49     <!--配置jdbc模板-->
50     <bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate">
51         <property name="dataSource" ref="dataSource" />
52     </bean>
53 
54 </beans>

对数据的基本操作做测试，增删改查

package cn.tx.test;

import cn.tx.demo1.Account;
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;


@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(value = "classpath:applicationContext_jdbc.xml")
public class Demo1_1 {

    @Autowired
    private JdbcTemplate jdbcTemplate;

    /**
     * 测试的方式
     */
    @Test
    public void run1(){
        jdbcTemplate.update("insert into account values (null,?,?)","熊四",800);
    }

    /**
     * 修改
     */
    @Test
    public void run2(){
        jdbcTemplate.update("update account set name = ?,money = ? where id = ?","光头强",100,7);
    }

    /**
     * 删除
     */
    @Test
    public void run3(){
        jdbcTemplate.update("delete from account where id = ?",7);
    }

    /**
     * 通过id查询
     */
    @Test
    public void run4(){
        Account account = jdbcTemplate.queryForObject("select * from account where id = ?", new BeanMapper(), 6);
        System.out.println(account);
    }

    /**
     * 查询所有的数据
     */
    @Test
    public void run5(){
        List<Account> list = jdbcTemplate.query("select * from account", new BeanMapper());
        for (Account account : list) {
            System.out.println(account);
        }
    }

}

/**
 * 实现类，用来进行数据封装的
 */
class BeanMapper implements RowMapper<Account>{

    /**
     * 是一行一行进行数据封装的
     * @param resultSet
     * @param i
     * @return
     * @throws SQLException
     */
    @Override
    public Account mapRow(ResultSet resultSet, int i) throws SQLException {
        Account account = new Account();
        account.setId(resultSet.getInt("id"));
        account.setName(resultSet.getString("name"));
        account.setMoney(resultSet.getDouble("money"));
        return account;
    }

}

模拟转账

编写service层代码

package cn.tx.demo2;


public interface AccountService {

    /**
     * 转账的方法
     * @param out       付款人
     * @param in        收款人
     * @param money     金额
     */
    public void pay(String out,String in,double money);

}

实现接口

package cn.tx.demo2;


public class AccountServiceImpl implements AccountService {

    private AccountDao accountDao;
    public void setAccountDao(AccountDao accountDao) {
        this.accountDao = accountDao;
    }

    /**
     * 转账方法
     * @param out       付款人
     * @param in        收款人
     * @param money     金额
     */
    @Override
    public void pay(String out, String in, double money) {
        // 调用dao方法
        accountDao.outMoney(out,money);

        accountDao.inMoney(in,money);
    }

}

dao层的代码

package cn.tx.demo2;


public interface AccountDao {

    /**
     * 付款
     * @param out
     * @param money
     */
    public void outMoney(String out,double money);

    /**
     * 收款
     * @param in
     * @param money
     */
    public void inMoney(String in,double money);

}

实现dao层的接口

package cn.tx.demo2;

import org.springframework.jdbc.core.JdbcTemplate;


public class AccountDaoImpl implements AccountDao {

    private JdbcTemplate jdbcTemplate;
    public void setJdbcTemplate(JdbcTemplate jdbcTemplate) {
        this.jdbcTemplate = jdbcTemplate;
    }

    /**
     * 付款
     * @param out
     * @param money
     */
    @Override
    public void outMoney(String out, double money) {
        jdbcTemplate.update("update account set money = money - ? where name = ?",money,out);
    }

    /**
     * 收款
     * @param in
     * @param money
     */
    @Override
    public void inMoney(String in, double money) {
        jdbcTemplate.update("update account set money = money + ? where name = ?",money,in);
    }

}

编写配置文件xml文件

<?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"
       xsi:schemaLocation="
                http://www.springframework.org/schema/beans
                http://www.springframework.org/schema/beans/spring-beans.xsd
                http://www.springframework.org/schema/context
                http://www.springframework.org/schema/context/spring-context.xsd
                http://www.springframework.org/schema/aop
                http://www.springframework.org/schema/aop/spring-aop.xsd">

    <!--第二种写法：使用提供标签的方式-->
    <context:property-placeholder location="classpath:jdbc.properties" />

    <!--加载属性的文件-->
    <bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource">
        <property name="driverClassName" value="${jdbc.driverClassName}" />
        <property name="url" value="${jdbc.url}" />
        <property name="username" value="${jdbc.username}" />
        <property name="password" value="${jdbc.password}" />
    </bean>

    <!--配置Jdbc模板类-->
    <bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate">
        <property name="dataSource" ref="dataSource" />
    </bean>

    <!--配置service-->
    <bean id="accountService" class="cn.tx.demo2.AccountServiceImpl">
        <property name="accountDao" ref="accountDao"/>
     </bean>

    <!--配置service-->
    <bean id="accountDao" class="cn.tx.demo2.AccountDaoImpl">
        <property name="jdbcTemplate" ref="jdbcTemplate" />
    </bean>

</beans>

测试转账和收款

 1 package cn.tx.test;
 2 
 3 import cn.tx.demo2.AccountService;
 4 import org.junit.Test;
 5 import org.junit.runner.RunWith;
 6 import org.springframework.beans.factory.annotation.Autowired;
 7 import org.springframework.test.context.ContextConfiguration;
 8 import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
 9 
10 
11 
12 @RunWith(SpringJUnit4ClassRunner.class)
13 @ContextConfiguration(value = "classpath:applicationContext_dao1.xml")
14 public class Demo2 {
15 
16     @Autowired
17     private AccountService accountService;
18 
19     /**
20      * 测试转账的方法
21      */
22     @Test
23     public void testPay(){
24         accountService.pay("熊大","熊二",100);
25     }
26 
27 }

在dao层使用JdbcDaoSupport 第二种方式，进行转账和收款的测试

同样在service层实现接口

 1  
 2 package cn.tx.demo3;
 3 
 4 
 5 public class AccountServiceImpl implements AccountService {
 6 
 7     private AccountDao accountDao;
 8     public void setAccountDao(AccountDao accountDao) {
 9         this.accountDao = accountDao;
10     }
11 
12     /**
13      * 转账方法
14      * @param out       付款人
15      * @param in        收款人
16      * @param money     金额
17      */
18     @Override
19     public void pay(String out, String in, double money) {
20         // 调用dao方法
21         accountDao.outMoney(out,money);
22 
23         accountDao.inMoney(in,money);
24     }
25 
26 }

注意在dao层编写，继承JdbcDaoSupport 和实现接口AccountDao

 1 package cn.tx.demo3;
 2 
 3 import org.springframework.jdbc.core.JdbcTemplate;
 4 import org.springframework.jdbc.core.support.JdbcDaoSupport;
 5 
 6 
 7 public class AccountDaoImpl extends JdbcDaoSupport implements AccountDao {
 8 
 9     /**
10      * 付款
11      * @param out
12      * @param money
13      */
14     @Override
15     public void outMoney(String out, double money) {
16         this.getJdbcTemplate().update("update account set money = money - ? where name = ?",money,out);
17     }
18 
19     /**
20      * 收款
21      * @param in
22      * @param money
23      */
24     @Override
25     public void inMoney(String in, double money) {
26         this.getJdbcTemplate().update("update account set money = money + ? where name = ?",money,in);
27     }
28 
29 }
30

编写配置文件

<?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"
       xsi:schemaLocation="
                http://www.springframework.org/schema/beans
                http://www.springframework.org/schema/beans/spring-beans.xsd
                http://www.springframework.org/schema/context
                http://www.springframework.org/schema/context/spring-context.xsd
                http://www.springframework.org/schema/aop
                http://www.springframework.org/schema/aop/spring-aop.xsd">

    <!--第二种写法：使用提供标签的方式-->
    <context:property-placeholder location="classpath:jdbc.properties" />

    <!--加载属性的文件-->
    <bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource">
        <property name="driverClassName" value="${jdbc.driverClassName}" />
        <property name="url" value="${jdbc.url}" />
        <property name="username" value="${jdbc.username}" />
        <property name="password" value="${jdbc.password}" />
    </bean>

    <!--配置Jdbc模板类
    <bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate">
        <property name="dataSource" ref="dataSource" />
    </bean>
    -->

    <!--配置service-->
    <bean id="accountService" class="cn.tx.demo3.AccountServiceImpl">
        <property name="accountDao" ref="accountDao"/>
     </bean>

    <!--配置dao
    <bean id="accountDao" class="cn.tx.demo3.AccountDaoImpl">
        <property name="jdbcTemplate" ref="jdbcTemplate" />
    </bean>
    -->

    <bean id="accountDao" class="cn.tx.demo3.AccountDaoImpl">
        <property name="dataSource" ref="dataSource" />
    </bean>

</beans>

测试使用JdbcDaoSupport 的方法进行转账和收款的测试

 1 package cn.tx.test;
 2 
 3 import cn.tx.demo3.AccountService;
 4 import org.junit.Test;
 5 import org.junit.runner.RunWith;
 6 import org.springframework.beans.factory.annotation.Autowired;
 7 import org.springframework.test.context.ContextConfiguration;
 8 import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
 9 
10 
11 @RunWith(SpringJUnit4ClassRunner.class)
12 @ContextConfiguration(value = "classpath:applicationContext_dao2.xml")
13 public class Demo3 {
14 
15     @Autowired
16     private AccountService accountService;
17 
18     /**
19      * 测试转账的方法
20      */
21     @Test
22     public void testPay(){
23         accountService.pay("熊大","熊二",100);
24     }
25 
26 }
27

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原文地址：https://www.cnblogs.com/LBJLAKERS/p/11752615.html

解析Spring第四天（Spring中的事物、Spring框架来管理模板类）

Spring框架管理开源的连接池

在dao层使用JdbcDaoSupport 第二种方式，进行转账和收款的测试