标签：数据 建议 rri system osi text string div under
1.Spring依赖注入的方式。
创建Hello实体类
private String name; private int age;
1.1通过set方法来完成依赖注入。
<bean id="Hello" class="com.zhiyou100.wyf.dao.Hello" > <property name="name" value="张三"/> <property name="age" value="11"/> </bean>
1.2通过构造方法来完成依赖注入。
<bean id="Hello2" class="com.zhiyou100.wyf.dao.Hello"> <constructor-arg index="0" value="lisi"/> <constructor-arg index="1" value="11"/> </bean>
1.3编写测试类
ApplicationContext app = new ClassPathXmlApplicationContext("applicationContext.xml"); Hello s = (Hello) app.getBean("Hello"); System.out.println(s);
2.依赖注入的数据类型
2.1基本数据类型和字符串 使用value
2.2如果是指向另一个对象的引用 使用ref
<bean id="Hello3" class="com.zhiyou100.wyf.dao.Hello" autowire="byName"> <property name="name" value="张三3"/> <property name="age" value="113"/> <property name="stu" ref="student1"/> </bean> <bean id="stu" class="com.zhiyou100.wyf.dao.student"> <property name="address" value="${user.a}"/> </bean>
2.3如果类对象注入的属性类型为list类型。
<bean id="Hello4" class="com.zhiyou100.wyf.dao.Hello"> <property name="name" value="张三3"/> <property name="age" value="113"/> <property name="s"> <list> <bean class="com.zhiyou100.wyf.dao.student"> <property name="address" value="南京"/> </bean> <bean class="com.zhiyou100.wyf.dao.student"> <property name="address" value="北京"/> </bean> <bean class="com.zhiyou100.wyf.dao.student"> <property name="address" value="九寨沟"/> </bean> </list> </property> </bean>
2.4如果类对象注入的属性类型为map类型
<bean id="Hello5" class="com.zhiyou100.wyf.dao.Hello"> <property name="name" value="张三"/> <property name="age" value="11"/> <property name="map"> <map> <entry key="wyf1" value="王玉峰"/> <entry key="wyf2" value="王玉峰"/> <entry key="wyf3" value="王玉峰"/> </map> </property> </bean>
3.bean 的作用域
Bean的作用域默认为单例模式
scope：表示bean的作用域，默认singleton， struts框架要求非单例
prototype:原生,非单例
<bean id="Hello" class="com.zhiyou100.wyf.dao.Hello" scope="prototype"> <property name="name" value="张三"/> <property name="age" value="11"/> </bean>
4.自动注入
新建两个实体类UserDao和UserService，两个类都实现接口
package com.zhiyou100.wyf.dao; import org.springframework.stereotype.Repository; @Repository public class UserDaoImp implements UserDao{ public void fingByid(int id) { System.out.println("根据id查询数据库"+id); } }
package com.zhiyou100.wyf.service; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Service; import com.zhiyou100.wyf.dao.UserDao; @Service public class UserServiceImp implements UserService { @Autowired private UserDao userDao;//依赖注入userdao接口的实现类对象 public UserDao getUserDao() { return userDao; } public void setUserDao(UserDao userDao) { this.userDao = userDao; } @Override public void queryByid(int id) { System.out.println("服务层"); userDao.fingByid(id); } }
package com.zhiyou100.wyf.controller; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Controller; import com.zhiyou100.wyf.service.UserService; @Controller(value="UserController") public class UserController { @Autowired private UserService userService; public UserService getUserService() { return userService; } public void setUserService(UserService userService) { this.userService = userService; } public void selectByid(int id) { System.out.println("控制台"); userService.queryByid(id); } }
4.1通过xml进行测试
配置文件：
<?xml version="1.0" encoding="UTF-8"?> <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"> <bean id="UserDao" class="com.zhiyou100.wyf.dao.UserDaoImp"></bean> <bean id="UserService" class="com.zhiyou100.wyf.service.UserServiceImp"> <property name="userDao" ref="UserDao"></property> </bean> <bean id="UserController" class="com.zhiyou100.wyf.controller.UserController"> <property name="userService" ref="UserService"></property> </bean> </beans>
test类
package test; import org.omg.CORBA.portable.ApplicationException; import org.springframework.context.ApplicationContext; import org.springframework.context.support.ClassPathXmlApplicationContext; import com.zhiyou100.wyf.controller.UserController; public class test { public static void main(String[] args) { ApplicationContext app = new ClassPathXmlApplicationContext("applicationContext.xml"); UserController u = (UserController) app.getBean("UserController"); u.selectByid(1); } }
4.2 通过注解
配置文件：
<?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-4.2.xsd"> <context:component-scan base-package="com.zhiyou100.wyf"></context:component-scan> </beans>
test类
package test; import org.springframework.context.ApplicationContext; import org.springframework.context.support.ClassPathXmlApplicationContext; import com.zhiyou100.wyf.controller.UserController; public class test1 { public static void main(String[] args) { ApplicationContext app = new ClassPathXmlApplicationContext("applicationContext1.xml"); UserController u = (UserController) app.getBean("UserController"); u.selectByid(2); } }
在相应的类上加上注解.
5.在spring配置文件中引入属性文件
users.name=zzzz users.age=55 users.address=asdasd
1 <context:property-placeholder location="classpath:my.properties"/> 2 <bean id="users" class="com.zhiyou100.wyf.Users"> 4 <property name="name" value="${users.name}"></property> 5 <property name="age" value="${users.age}"></property> 6 <property name="address" value="${users.address}"></property> 7 </bean>
不能使用user.name属性，会得到本电脑的用户名
标签：数据 建议 rri system osi text string div under
原文地址：https://www.cnblogs.com/yufengwang/p/11478781.html
