spring的入門編程
一、常用的springjar說明
- spring-aop-5.0.2.RELEASE.jar:spring對aop的支持
- spring-aspects-5.0.2.RELEASE.jar:spring對aspects的集成支持aspects就是一個AOP的開源庫
- spring-beans-5.0.2.RELEASE.jar:spring對配置文件的對象的解析與創建
- spring-context-5.0.2.RELEASE.jar:spring 對上下文(應用程序的運行環境)的支持包
- spring-context-support-5.0.2.RELEASE.jar:spring上下文集成的一些第三方主庫,如定時器
- spring-core-5.0.2.RELEASE.jar:spring 的核心包
- spring-expression-5.0.2.RELEASE.jar:spring 的相關表達式包
- spring-instrument-5.0.2.RELEASE.jar:輔助包【可以不使用】
- spring-instrument-tomcat-5.0.2.RELEASE.jar:輔助包【對tomcat的支持】
- spring-jdbc-5.0.2.RELEASE.jar:spring 對數據訪問的支持,類似DbUtil.java JdbcTemplete
- spring-messaging-5.0.2.RELEASE.jar
- spring-jms-5.0.2.RELEASE.jar:spring 對消息中間件的支持,如可以繼承MQ (Message Queue)
- spring-orm-5.0.2.RELEASE.jar
- spring-oxm-5.0.2.RELEASE.jar:都是對第三方 ORM 框架的擴展和集成
- spring-tx-5.0.2.RELEASE.jar:spring 對所有ORM 框架的事務支持
- spring-web-5.0.2.RELEASE.jar:spring 對所有的控制層的框架的集成支持如 struts
- spring-webmvc-5.0.2.RELEASE.jar:springmvc
- spring-websocket-5.0.2.RELEASE.jar:spring 對網頁聊天的支持
二、準備工作
1. 創建一個WEB項目並導包
2. 導入日誌包並創建log4j.properties
導包
創建db.properties
# Global logging configuration
log4j.rootLogger=DEBUG, stdout
# MyBatis logging configuration...
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
3. 創建User實體類
package com.lasing.domain;
import java.util.Date;
public class User {
private Integer id;
private String name;
private String address;
private Date birthday;
public User() {
super();
}
public User(Integer id, String name, String address, Date birthday) {
super();
this.id = id;
this.name = name;
this.address = address;
this.birthday = birthday;
}
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 getAddress() {
return address;
}
public void setAddress(String address) {
this.address = address;
}
public Date getBirthday() {
return birthday;
}
public void setBirthday(Date birthday) {
this.birthday = birthday;
}
@Override
public String toString() {
return "User [id=" + id + ", name=" + name + ", address=" + address + ", birthday=" + birthday + "]";
}
}
4. 創建UserDao
package com.lasing.dao;
import com.lasing.domain.User;
public interface UserDao {
public User queryUserById(Integer id);
}
5. 創建UserDaoImpl
package com.lasing.dao.impl;
import java.util.Date;
import com.lasing.dao.UserDao;
import com.lasing.domain.User;
public class UserDaoImpl implements UserDao{
public User queryUserById(Integer id) {
User user = null;
switch (id) {
case 1:
user = new User(1,"小明","清遠",new Date());
break;
case 2:
user = new User(2,"老王","清遠",new Date());
break;
case 3:
user = new User(3,"史萊克","清遠",new Date());
break;
}
return user;
}
}
6. 創建UserService
package com.lasing.service;
import com.lasing.domain.User;
public interface UserService {
public User queryUserById(Integer id);
}
7. 創建UserServiceImpl
package com.lasing.service.impl;
import com.lasing.dao.UserDao;
import com.lasing.domain.User;
import com.lasing.service.UserService;
public class UserServiceImpl implements UserService{
private UserDao userDao;
public void setDao(UserDao userDao) {
this.userDao = userDao;
}
public User queryUserById(Integer id) {
return userDao.queryUserById(id);
}
}
8. 創建UserController
package com.lasing.controller;
import com.lasing.domain.User;
import com.lasing.service.UserService;
public class UserController {
private UserService userService;
public void setService(UserService userService) {
this.userService = userService;
}
public void queryUserById() {
Integer id = 1;
User user = userService.queryUserById(id);
System.out.println(user.toString());
}
}
9. 創建並配置applicationContext
<?xml version="1.0" encoding="UTF-8"?>
<!-- 導入頭文件 -->
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd">
<!-- 聲明dao -->
<bean id="userDao" class="com.lasing.dao.impl.UserDaoImpl"/>
<!-- 聲明service -->
<bean id="userService" class="com.lasing.service.impl.UserService">
<property name="userDao" ref="userDao"/>
</bean>
<!-- 聲明controller -->
<bean id="userController" class="com.lasing.controller.UserController">
<property name="userService" ref="userService"/>
</bean>
</beans>
10. 測試
package com.lasing.test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import com.lasing.controller.UserController;
public class UserTest {
public static void main(String[] args) {
ApplicationContext applicationContext = new ClassPathXmlApplicationContext("classpath:applicationContext.xml");
System.out.println(applicationContext);
UserController userController = (UserController) applicationContext.getBean("userController", UserController.class);
userController.queryUserById();
}
}