Spring配置数据源

我们是使用的是maven，我们下载节点即可。

<dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-context</artifactId>
    <version>4.3.3.RELEASE</version>
</dependency>

 <!--spring-jdbcjar 包-->
<dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-jdbc</artifactId>
    <version>4.3.3.RELEASE</version>
</dependency>
<!--commons-dncpjar 包-->
<dependency>
    <groupId>org.apache.commons</groupId>
    <artifactId>commons-dbcp2</artifactId>
    <version>2.1.1</version>
</dependency>

<!--c3p0jar 包-->
<dependency>
    <groupId>c3p0</groupId>
    <artifactId>c3p0</artifactId>
    <version>0.9.1.2</version>
</dependency>

<!--mysql数据库驱动-->
<dependency>
     <groupId>org.wisdom-framework</groupId>
     <artifactId>mysql-connector-java</artifactId>
     <version>5.1.34_1</version>
</dependency>
（1）创建分层  beans层（实体类）   dao（表示层）  biz（业务逻辑层） web（数据展示） util（工具类层）
BEANS:
public class Book {

    private Integer id;
    private String name;
    private String price;

    public Book() {
    }

    public Book(String name, String price) {
        this.name = name;
        this.price = price;
    }

    public Integer getId() {
        return id;
    }

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

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getPrice() {
        return price;
    }

    public void setPrice(String price) {
        this.price = price;
    }
}
DAO:

public interface BookDao {
    int add(Book book);

    List<Book> selectAll();
}
使用注解的方式实现方法的实现层impl

@Repository
public class BookDaoImpl extends  JdbcDaoSupport implements BookDao {

    public int add(Book book) {
        int count = this.getJdbcTemplate().update("insert into book(name,price) values(?,?)",book.getName(),book.getPrice());
        return count;
    }

    public List<Book> selectAll() {
        return this.getJdbcTemplate().query("select * from book",new MyRowMapper());
    }
    @Autowired
    public void setJdbcTemplate2(JdbcTemplate jbdcTemplate){
        super.setJdbcTemplate(jbdcTemplate);
    }
}
你可能会问为啥要定义setJdbcTemplate2()方法呢？

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



    @Override
    protected void checkDaoConfig() {
        if (this.jdbcTemplate == null) {
            throw new IllegalArgumentException("'dataSource' or 'jdbcTemplate' is required");
        }
    }
该方法源自父类的方法，并且是经过final修饰，我们都知道被final修饰的方法是不能被修改的，当我们自己不重新定义方法，而是使用相同的方法名时，会出现错误。
BIZ：

public interface BookBiz {
    int add(Book book);

    List<Book> selestAll();
}
Biz层方法的实现层impl:

@Service("bookBiz")
public class BookBizImpl implements BookBiz {
    @Resource
    private BookDao dao;
    public int add(Book book) {
        return dao.add(book);
    }

    public List<Book> selestAll() {
        return dao.selectAll();
    }
}

public class FirstTest {
    @Test
    public void findTwo(){
        ApplicationContext ctx=new ClassPathXmlApplicationContext("applicationContexttemp.xml");
        BookBiz proxy=(BookBiz) ctx.getBean("bookBiz");
        int count = proxy.add(new Book("hello ", "45"));
        System.out.println(count);
    }

    @Test
    public void findOne(){
        ApplicationContext ctx=new ClassPathXmlApplicationContext("applicationContexttemp.xml");
        BookBiz proxy=(BookBiz) ctx.getBean("bookBiz");
        List<Book> list = proxy.selestAll();
        for (Book item  : list) {
            System.out.println(item.getName());
        }
    }
}
xml编写：

<?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:tx="http://www.springframework.org/schema/tx"
       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
        http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx.xsd">
<!--配置数据源-->

<!--spring 内置-->
    <bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
        <property name="driverClassName" value="${jdbc.driver}"></property>
        <property name="url" value="${jdbc.url}"></property>
        <property name="username" value="${jdbc.username}"></property>
        <property name="password" value="${jdbc.password}"></property>
    </bean>
    <!--c3p0数据源-->
    <!--<bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
        <property name="driverClass" value="${jdbc.driver}"></property>
        <property name="jdbcUrl" value="${jdbc.url}"></property>
        <property name="user" value="${jdbc.username}"></property>
        <property name="password" value="${jdbc.password}"></property>
    </bean>-->
    <!--定义dbcp数据源-->
    <!--<bean id="dataSource" class="org.apache.commons.dbcp2.BasicDataSource">
        <property name="driverClassName" value="${jdbc.driver}"></property>
        <property name="url" value="${jdbc.url}"></property>
        <property name="username" value="${jdbc.username}"></property>
        <property name="password" value="${jdbc.password}"></property>
    </bean>-->
先这么多吧。。。。。。。。。。。。