Spring的初体验-4

一. Spring中使用JdbcTemplate模版

1. 配置properties文件（src/jdbc.properties）

jdbc.driverClassName=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/db_spring
jdbc.username=root
jdbc.password=123456

2. Spring配置文件（src/beans.xml）

<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns:aop="http://www.springframework.org/schema/aop"
    xmlns:context="http://www.springframework.org/schema/context"
    xsi:schemaLocation="http://www.springframework.org/schema/beans
        http://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/aop
        http://www.springframework.org/schema/aop/spring-aop.xsd
        http://www.springframework.org/schema/context
        http://www.springframework.org/schema/context/spring-context.xsd">
        
	<bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close">
        <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>
    
	<context:property-placeholder location="jdbc.properties"/>
    
    <bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate">
    	<property name="dataSource" ref="dataSource">property>
    bean>
	
	
	<bean id="studentDao" class="com.bee.dao.impl.StudentDaoImpl">
		<property name="jdbcTemplate" ref="jdbcTemplate">property>
	bean> 
	
	<bean id="studentService" class="com.bee.service.impl.StudentServiceImpl">
		<property name="studentDao" ref="studentDao">property>
	bean> 
	
beans>

3. 相关jar包

//连接池
commons-dbcp-1.4.jar
commons-pool.jar
//Spring
aopalliance.jar
aspectjweaver-1.6.6.jar
commons-collections-3.2.jar
commons-logging.jar
spring-aop-4.0.6.RELEASE.jar
spring-aspects-4.0.6.RELEASE.jar
spring-beans-4.0.6.RELEASE.jar
spring-context-4.0.6.RELEASE.jar
spring-core-4.0.6.RELEASE.jar
spring-expression-4.0.6.RELEASE.jar
spring-jdbc-4.0.6.RELEASE.jar
spring-tx-4.0.6.RELEASE.jar
//jdbc
mysql-connector-java-3.1.12-bin.jar

4. DAO层

public interface StudentDao {
	int addStudent(Student student);
	int updateStudent(Student student);
	int deleteStudent(int id);
	List<Student> findStudents();
}

public class StudentDaoImpl implements StudentDao{

	private JdbcTemplate jdbcTemplate;
	//依赖注入
	public void setJdbcTemplate(JdbcTemplate jdbcTemplate) {
		this.jdbcTemplate = jdbcTemplate;
	}

	@Override
	public int addStudent(Student student) {
		String sql="insert into t_student values(null,?,?)";
		Object[] params=new Object[]{student.getName(),student.getAge()};
		return jdbcTemplate.update(sql,params);
	}

	@Override
	public int updateStudent(Student student) {
		String sql="update t_student set name=?,age=? where id=?";
		Object[] params=new Object[]{student.getName(),student.getAge(),student.getId()};
		return jdbcTemplate.update(sql,params);
	}

	@Override
	public int deleteStudent(int id) {
		String sql="delete from t_student where id=?";
		Object[] params=new Object[]{id};
		return jdbcTemplate.update(sql,params);
	}

	@Override
	public List<Student> findStudents() {
		String sql="select * from t_student";
		//匿名内部类引用外部类的属性时，该属性必须用final修饰。
		final List<Student> studentList=new ArrayList<Student>();
		//定义回调函数——先定义方法，方法不是现在调用，什么时候调用，“等回头有需要的时候再说”。
		jdbcTemplate.query(sql, new RowCallbackHandler(){

			@Override
			public void processRow(ResultSet rs) throws SQLException {
				Student student=new Student();
				student.setId(rs.getInt("id"));
				student.setName(rs.getString("name"));
				student.setAge(rs.getInt("age"));
				studentList.add(student);
			}
		});
		return studentList;
	}
}

5. Service层

public interface StudentService {
	int addStudent(Student student);
	int updateStudent(Student student);
	int deleteStudent(int id);
	List<Student> findStudents();
}

public class StudentServiceImpl implements StudentService{

	private StudentDao studentDao;
	//依赖注入
	public void setStudentDao(StudentDao studentDao) {
		this.studentDao = studentDao;
	}

	@Override
	public int addStudent(Student student) {
		return studentDao.addStudent(student);
	}

	@Override
	public int updateStudent(Student student) {
		return studentDao.updateStudent(student);
	}

	@Override
	public int deleteStudent(int id) {
		return studentDao.deleteStudent(id);
	}

	@Override
	public List<Student> findStudents() {
		return studentDao.findStudents();
	}
}

6. 业务测试

public class DBTester {
	private ApplicationContext ac;
	
	@Before
	public void setUp() throws Exception {
		ac=new ClassPathXmlApplicationContext("beans.xml");
	}

	@Test
	public void addStudent() {
		StudentService studentService=(StudentService)ac.getBean("studentService");
		int addNums=studentService.addStudent(new Student("瓦塔诺", 1));
		if(addNums==1){
			System.out.println("添加成功");
		}
	}
	
	@Test
	public void updateStudent() {
		StudentService studentService=(StudentService)ac.getBean("studentService");
		int updateNums=studentService.updateStudent(new Student(8,"史巴拉古", 2));
		if(updateNums==1){
			System.out.println("更新成功");
		}
	}
	
	@Test
	public void deleteStudent() {
		StudentService studentService=(StudentService)ac.getBean("studentService");
		int deleteNums=studentService.deleteStudent(8);
		if(deleteNums==1){
			System.out.println("删除成功");
		}
	}
	
	@Test
	public void findStudents() {
		StudentService studentService=(StudentService)ac.getBean("studentService");
		List<Student> studentList=studentService.findStudents();
		for(Student student:studentList){
			System.out.println(student);
		}
	}
}

二. Spring中使用JdbcDaoSupport

1. Spring配置文件（src/beans.xml）

<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns:aop="http://www.springframework.org/schema/aop"
    xmlns:context="http://www.springframework.org/schema/context"
    xsi:schemaLocation="http://www.springframework.org/schema/beans
        http://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/aop
        http://www.springframework.org/schema/aop/spring-aop.xsd
        http://www.springframework.org/schema/context
        http://www.springframework.org/schema/context/spring-context.xsd">
        
	<bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close">
        <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>
    
	<context:property-placeholder location="jdbc.properties"/>
    
	<bean id="studentDao" class="com.bee.dao.impl.StudentDaoImpl">
		<property name="dataSource" ref="dataSource">property>
	bean> 
	
	<bean id="studentService" class="com.bee.service.impl.StudentServiceImpl">
		<property name="studentDao" ref="studentDao">property>
	bean> 
	
beans>

2. DAO层

public class StudentDaoImpl extends JdbcDaoSupport implements StudentDao{

	@Override
	public int addStudent(Student student) {
		String sql="insert into t_student values(null,?,?)";
		Object[] params=new Object[]{student.getName(),student.getAge()};
		return this.getJdbcTemplate().update(sql,params);
	}

	@Override
	public int updateStudent(Student student) {
		String sql="update t_student set name=?,age=? where id=?";
		Object[] params=new Object[]{student.getName(),student.getAge(),student.getId()};
		return this.getJdbcTemplate().update(sql,params);
	}

	@Override
	public int deleteStudent(int id) {
		String sql="delete from t_student where id=?";
		Object[] params=new Object[]{id};
		return this.getJdbcTemplate().update(sql,params);
	}

	@Override
	public List<Student> findStudents() {
		String sql="select * from t_student";
		final List<Student> studentList=new ArrayList<Student>();
		this.getJdbcTemplate().query(sql, new RowCallbackHandler(){

			@Override
			public void processRow(ResultSet rs) throws SQLException {
				Student student=new Student();
				student.setId(rs.getInt("id"));
				student.setName(rs.getString("name"));
				student.setAge(rs.getInt("age"));
				studentList.add(student);
			}
		});
		return studentList;
	}
}

三. Spring中使用NamedParameterJdbcTemplate

1. Spring配置文件（src/beans.xml）

<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns:aop="http://www.springframework.org/schema/aop"
    xmlns:context="http://www.springframework.org/schema/context"
    xsi:schemaLocation="http://www.springframework.org/schema/beans
        http://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/aop
        http://www.springframework.org/schema/aop/spring-aop.xsd
        http://www.springframework.org/schema/context
        http://www.springframework.org/schema/context/spring-context.xsd">
        
	<bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close">
        <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>
    
	<context:property-placeholder location="jdbc.properties"/>
    
    <bean id="namedParameterJdbcTemplate" class="org.springframework.jdbc.core.namedparam.NamedParameterJdbcTemplate">
    	<constructor-arg ref="dataSource">constructor-arg>
    bean>
	
	<bean id="studentDao" class="com.bee.dao.impl.StudentDaoImpl">
		<property name="namedParameterJdbcTemplate" ref="namedParameterJdbcTemplate">property>
	bean> 
	
	<bean id="studentService" class="com.bee.service.impl.StudentServiceImpl">
		<property name="studentDao" ref="studentDao">property>
	bean> 
	
beans>

2. DAO层

public class StudentDaoImpl implements StudentDao{

	private NamedParameterJdbcTemplate namedParameterJdbcTemplate;
	
	public void setNamedParameterJdbcTemplate(
			NamedParameterJdbcTemplate namedParameterJdbcTemplate) {
		this.namedParameterJdbcTemplate = namedParameterJdbcTemplate;
	}

	@Override
	public int addStudent(Student student) {
		String sql="insert into t_student values(null,:name,:age)";
		MapSqlParameterSource sps=new MapSqlParameterSource();
		sps.addValue("name", student.getName());
		sps.addValue("age", student.getAge());
		return namedParameterJdbcTemplate.update(sql,sps);
	}

	@Override
	public int updateStudent(Student student) {
		String sql="update t_student set name=:name,age=:age where id=:id";
		MapSqlParameterSource sps=new MapSqlParameterSource();
		sps.addValue("name", student.getName());
		sps.addValue("age", student.getAge());
		sps.addValue("id", student.getId());
		return namedParameterJdbcTemplate.update(sql,sps);
	}

	@Override
	public int deleteStudent(int id) {
		String sql="delete from t_student where id=:id";
		MapSqlParameterSource sps=new MapSqlParameterSource();
		sps.addValue("id", id);
		return namedParameterJdbcTemplate.update(sql,sps);
	}

	@Override
	public List<Student> findStudents() {
		String sql="select * from t_student";
		final List<Student> studentList=new ArrayList<Student>();
		namedParameterJdbcTemplate.query(sql, new RowCallbackHandler(){

			@Override
			public void processRow(ResultSet rs) throws SQLException {
				Student student=new Student();
				student.setId(rs.getInt("id"));
				student.setName(rs.getString("name"));
				student.setAge(rs.getInt("age"));
				studentList.add(student);
			}			
		});
		return studentList;
	}
}