1.分析
- 代码分为三层，分别为dao、service和test（测试用，暂时不涉及web）。
- 每个类拥有自己的接口和实现类。
2.Dao
- 包名是com.itlike.dao
- UserDao（接口）
package com.itlike.dao;
public interface UserDao {
public void delete();
}
- UserDaoImpl（实现类）
package com.itlike.dao;
import org.springframework.stereotype.Repository;
@Repository("userDao")
public class UserDaoImpl implements UserDao{
@Override
public void delete(){
System.out.println("从数据库当中删除记录");
}
}
3.Service
- 包名是com.itlike.service
- UserService（接口）
package com.itlike.service;
public interface UserService {
public void delete();
}
- UserServiceImpl（实现类）
package com.itlike.service;
import com.itlike.dao.UserDao;
import org.springframework.stereotype.Service;
import javax.annotation.Resource;
@Service("userService")
public class UserServiceImpl implements UserService {
@Resource(name="userDao")
private UserDao userDao;
@Override
public void delete() {
userDao.delete();
}
}
4.Test
- 包名是com.itlike.test
- UserTest
package com.itlike.test;
import com.itlike.service.UserService;
import com.itlike.service.UserServiceImpl;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
public class UserTest {
@Test
public void test(){
ApplicationContext app = new ClassPathXmlApplicationContext("applicationContext.xml");
UserService user =(UserServiceImpl) app.getBean("userService");
user.delete(); //从数据库当中删除记录
}
}
输出：从数据库当中删除记录
5.相关配置文件
- applicationContext.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"
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">
<context:component-scan base-package="com.itlike"/>
</beans>
- log4j.properties
# Define the root logger with appender file
log4j.rootLogger = DEBUG, FILE
# Define the file appender
log4j.appender.FILE=org.apache.log4j.FileAppender
# Set the name of the file
log4j.appender.FILE.File=D://mylog.log
# Set the immediate flush to true (default)
log4j.appender.FILE.ImmediateFlush=true
# Set the threshold to debug mode
log4j.appender.FILE.Threshold=debug
# Set the append to false, overwrite
log4j.appender.FILE.Append=false
# Define the layout for file appender
log4j.appender.FILE.layout=org.apache.log4j.PatternLayout
log4j.appender.FILE.layout.conversionPattern=%m%n