Spring 註解版簡單例項之強大的@Component(二)
阿新 • • 發佈:2019-02-20
1 接上一篇文章<Spring 註解版簡單例項(一)>,此處為 @Component與@Resource相結合
在applicationContext.xml 檔案中使用<context:component-scan>的效果,大大的減少了配置檔案的書寫,只新增一句
<context:component-scan base-package="com.bjsxt"/> 掃描包的路徑
<?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-2.5.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-2.5.xsd"> <context:annotation-config /> <context:component-scan base-package="com.bjsxt"/> </beans>
2 在UserServer和UserDAo類中分別更改為
UserSevice
package com.bjsxt.service; import javax.annotation.Resource; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.beans.factory.annotation.Qualifier; import org.springframework.stereotype.Component; import com.bjsxt.dao.UserDAO; import com.bjsxt.model.User; @Component("userService") public class UserService { private UserDAO userDAO; public void init() { System.out.println("init"); } public void add(User user) { userDAO.save(user); } public UserDAO getUserDAO() { return userDAO; } @Resource(name="u") public void setUserDAO( UserDAO userDAO) { this.userDAO = userDAO; } }
userDAO
package com.bjsxt.dao.impl; import org.springframework.stereotype.Component; import com.bjsxt.dao.UserDAO; import com.bjsxt.model.User; @Component("u") public class UserDAOImpl implements UserDAO { public void save(User user) { //Hibernate //JDBC //XML //NetWork System.out.println("user saved!"); } }
3執行效果和以前的一樣