spring 集成 mybatis的实例详解

 环境配置

1>先创建maven的quickstart项目;并且创建dao层,service层,controller层,po层,mapper,resources以及下面的配置文件(db.properties,log4j.properties,mybatis.xml,spring.xml).

2>配置pom.xml

​ 修改jdk版本;

​ 添加依赖:

​ junit版本改为4.12;spring-context;spring-test;spring-jdbc;spring-tx(事务);aspectjweaver(切面编程);c3p0(连接池);mybatis;mybatis-spring;mysql-connector-java(mysql驱动包);slf4j-log4j12,slf4j-api(日志打印);

​ 设置资源目录和插件

 
 
 
  
  src/main/resources
  
  
  src/main/java
  
   **/*.xml
   **/*.properties
   **/*.tld
  
  false
  
 
 

3>配置spring.xml

4>配置 mybatis.xml

5>配置 db.properties

jdbc.url中?前面的spring_mybatis是数据库名字,注意要修改下

password是密码,也是要修改下的

6>添加日志

jdbc.driver=com.mysql.cj.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/spring_mybatis?
useUnicode=true&characterEncoding=utf8&serverTimezone=GMT%2B8&useSSL=false
jdbc.username=root
jdbc.password=root 

log4j.properties

log4j.rootLogger=DEBUG, Console
# Console
log4j.appender.Console=org.apache.log4j.ConsoleAppender
log4j.appender.Console.layout=org.apache.log4j.PatternLayout
log4j.appender.Console.layout.ConversionPattern=%d [%t] %-5p [%c] - %m%n
log4j.logger.java.sql.ResultSet=INFO
log4j.logger.org.apache=INFO
log4j.logger.java.sql.Connection=DEBUG
log4j.logger.java.sql.Statement=DEBUG
log4j.logger.java.sql.PreparedStatement=DEBUG

添加源代码

1>在po 包下创建 JavaBean 文件 User.java

public class User {
 private Integer userId;
 private String userName;
 private String userPwd;
 private String userEmail;
 private Date createDate;
 private Date updateDate;
 
 /**
  set get toString 方法省略
 **/
}

2>在dao层添加UserDao接口

public interface UserDao {
 User queryUserByUserId(Integer userId);
}

3>在mapper包添加UserMapper.xml 映射文件

sql代码写在这地方

  
   select user_id as userId,user_name as userName,user_pwd as userPwd
   from tb_user
   where user_id = #{userId}
  

4>添加 UserService.java

@Service
public class UserService {
 @Autowired
 private UserDao userDao;
 public User queryUserByUserId(Integer userId){
  return userDao.queryUserByUserId(userId);
 }
}

5>添加 UserController.java

@Controller
public class UserController {
 // 注入userService
 @Resource
 private UserService userService;
 /**
 * 通过用户ID查询用户对象
 * @param userId
 * @return
 */
 public User queryUserByUserId(Integer userId) {
  User user = userService.queryUserByUserId(userId);
  return user;
 }
}

执行测试

public class App {
 public static void main(String[] args) {
  // 加载Spring的配置
  BeanFactory factory = new ClassPathXmlApplicationContext("spring.xml");
  // 得到UserController对象
  UserController userController = (UserController)
factory.getBean("userController");
  // 调用方法
  User user = userController.queryUserByUserId(1);
System.out.println(user.toString());
 }
}

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