jdk8.0+tomcat8.0+IDEA+MySql数据库
在idea中建立maven工程sm_demo1,并进行如下配置:(idea中jar配置坐标后会自动下载,此处不多做解释)
*注意:中spring-bean.xml文件以spring-bean2.xml为主,其他两个请自动忽略
pom.xml:坐标配置
src:该目录下主要存放java代码,其中:
com.lmm.sm.bean:管理java实体类;
com.lmm.sm.dao:持久层代码管理,主要完成对数据库的CRUD;
com.lmm.sm.service:业务层代码管理,主要完成相关的业务处理;;
com.lmm.sm.test:一般用来进行单元测试;
com.lmm.sm.commons:自定义的一个切面类(实际上就是一个代理类);
resources:该目录下主要存放配置文件,其中有:
db.properties:配置数据库的driver、url、username、password
jdbc.driver=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/mybatis?characterEncoding=utf-8
jdbc.username=root
jdbc.password=root
log4j.properties:配置框架日志输出
# Global logging configuration
# developer-->DEBUG productor-->INFO or ERROR
log4j.rootLogger=DEBUG, stdout
# MyBatis logging configuration...
6
log4j.logger.org.mybatis.example.BlogMapper=TRACE
# Console output...
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=%5p [%t] - %m%n
mybatis-config.xml:主要进行mybatis框架的配置,我们一般会配置别名、mapper映射等
spring-bean2.xml:spring框架配置文件,主要用来配置dataSource、sqlSessionFactory等
/**
* 用户实体类
*/
public class User implements Serializable {
private Integer id;
private String username;
private String sex;
private Date birthday;
private String address;
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
public String getSex() {
return sex;
}
public void setSex(String sex) {
this.sex = sex;
}
public Date getBirthday() {
return birthday;
}
public void setBirthday(Date birthday) {
this.birthday = birthday;
}
public String getAddress() {
return address;
}
public void setAddress(String address) {
this.address = address;
}
@Override
public String toString() {
return "User{" +
"id=" + id +
", username='" + username + '\'' +
", sex='" + sex + '\'' +
", birthday=" + birthday +
", address='" + address + '\'' +
'}';
}
}
/**
* dao层接口
*/
public interface UserDao {
@Select("select *from user")
@Results(
id = "userMap",
value = {
@Result(id = true,column = "id",property = "id"),
@Result(column = "username",property = "username"),
@Result(column = "sex",property = "sex"),
@Result(column = "birthday",property = "birthday"),
@Result(column = "address",property = "address")
}
)
public List findUsers();
}
/**
* service层实现类
*/
@Service("userService")//需要在spring-dao.xml中配置扫包等同于
public class UserServiceImpl implements UserService {
@Autowired//需要在spring-dao.xml中配置相关信息,等同于
private UserDao userDao;
public List findUsers() {
return userDao.findUsers();
}
}
/**
* service层接口
*/
public interface UserService {
/**
* 查询所有用户信息
* @return
*/
public List findUsers();
}
public class AspectAround {
/**
* 环绕通知
* @param joinPoint (加强版连接点)
*/
public Object time(ProceedingJoinPoint joinPoint){
Object obj = null;
long starttime = 0;//开始时间
long endtime = 0;//结束时间
try {
System.out.println("开始事务****************************");
starttime = System.currentTimeMillis();
//执行目标方法
obj = joinPoint.proceed();
endtime = System.currentTimeMillis();
System.out.println("提交事务****************************");
} catch (Throwable throwable) {
System.out.println("回滚事务****************************");
throwable.printStackTrace();
}finally {
System.out.println("结束事务****************************");
//计算执行方法的时间
System.out.println("目标方法执行的时间:======"+(endtime-starttime)+"毫秒");
//接收目标方法的返回数据
List users = (List) obj;
System.out.println("返回数据:++++"+users.toString());
}
return obj;
}
}
public class AspectCommon {
/**
* 定义前置通知
*/
//public void methodBefore(){
public void methodBefore(JoinPoint joinPoint){
System.out.println("AspectCommon------------------开始事务!");
System.out.println("joinPoint.getTarget():"+joinPoint.getTarget());
System.out.println("joinPoint.getArgs():"+joinPoint.getArgs());
System.out.println("joinPoint.getSignature():"+joinPoint.getSignature());
}
/**
* 定义后置通知(有返回值)
* @param returnValue:这个就是目标方法的返回值
*/
public void methodAfterReturning(Object returnValue){
System.out.println("AspectCommon------------------提交事务!");
List users = (List) returnValue;
System.out.println("AspectCommon------------------:"+users.toString());
}
/**
* 定义后置通知(目标方法异常)
* @param ex:这个就是目标方法的异常
*/
public void processException(Exception ex){
System.out.println("AspectCommon------------------回滚事务!");
System.out.println("AspectCommon------------------ex:"+ex.getMessage());
System.out.println("AspectCommon------------------ex:"+ex.getStackTrace());
}
}
public class MyAspectAround implements MethodBeforeAdvice, AfterReturningAdvice {
/**
* 后置通知
* @param o
* @param method
* @param objects
* @param o1
* @throws Throwable
*/
public void afterReturning(Object o, Method method, Object[] objects, Object o1) throws Throwable {
System.out.println("MyAspectAround------------------------后置通知");
}
/**
* 前置通知
* @param method
* @param objects
* @param o
* @throws Throwable
*/
public void before(Method method, Object[] objects, Object o) throws Throwable {
System.out.println("MyAspectAround------------------------前置通知");
}
}
public class UserTest {
public class UserTest {
/**
* 查询所有用户信息
*/
@Test
public void findUsers(){
ApplicationContext context = new ClassPathXmlApplicationContext("spring-bean.xml");
UserService userService = (UserService) context.getBean("userService");
List users = userService.findUsers();
System.out.println(users);
}
}
以上测试内容就包含了前置通知+后置通知+后置异常通知+环绕通知,如有疑问,欢迎各位评论