标签:obb ram rri pre 标签 依赖注入 span oss release
1、官网
2、构造器注入(前面有)
3、Set方式注入(重点)
A、依赖 : bean对象 依赖 容器 创建
B、注入: bean对象的属性,由容器注入
https://docs.spring.io/spring/docs/5.2.7.RELEASE/spring-framework-reference/core.html#beans-factory-properties-detailed
案例
a、pojo
Address.java
package com.wt.pojo; public class Address { private String address; public String getAddress() { return address; } public void setAddress(String address) { this.address = address; } @Override public String toString() { return "Address{" + "address=‘" + address + ‘\‘‘ + ‘}‘; } }
Student.java
package com.wt.pojo; import java.util.*; public class Student { private String name; private Address address; private String[] books; private List<String> hobbys; private Map<String, String> card; private Set<String> games; private String wife; private Properties info; @Override public String toString() { return "Student{" + "name=‘" + name + ‘\‘‘ + ", address=" + address.toString() + ", books=" + Arrays.toString(books) + ", hobbys=" + hobbys + ", card=" + card + ", games=" + games + ", wife=‘" + wife + ‘\‘‘ + ", info=" + info + ‘}‘; } public String getName() { return name; } public void setName(String name) { this.name = name; } public Address getAddress() { return address; } public void setAddress(Address address) { this.address = address; } public String[] getBooks() { return books; } public void setBooks(String[] books) { this.books = books; } public List<String> getHobbys() { return hobbys; } public void setHobbys(List<String> hobbys) { this.hobbys = hobbys; } public Map<String, String> getCard() { return card; } public void setCard(Map<String, String> card) { this.card = card; } public Set<String> getGames() { return games; } public void setGames(Set<String> games) { this.games = games; } public String getWife() { return wife; } public void setWife(String wife) { this.wife = wife; } public Properties getInfo() { return info; } public void setInfo(Properties info) { this.info = info; } }
b、xml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 https://www.springframework.org/schema/beans/spring-beans.xsd"> <bean id="address" class="com.wt.pojo.Address"> <property name="address" value="徐州大庙李井村"/> </bean> <bean id="user" class="com.wt.pojo.Student" name="student"> <!-- 普通数据 --> <property name="name" value="吴通"/> <!-- 类 --> <property name="address" ref="address"/> <!-- 数组 --> <property name="books"> <array> <value>西游记</value> <value>红楼梦</value> <value>家</value> <value>兄弟</value> </array> </property> <!-- list--> <property name="hobbys"> <list> <value>看电影</value> <value>敲代码</value> </list> </property> <!-- map--> <property name="card"> <map> <entry key="银行卡" value="7458694756870"></entry> <entry key="电话卡" value="13057122577"></entry> </map> </property> <!-- set--> <property name="games"> <set> <value>WOW</value> <value>鬼泣</value> </set> </property> <!-- null--> <property name="wife"> <null/> </property> <!-- Properties--> <property name="info"> <props> <prop key="driver">driver</prop> <prop key="url">url</prop> <prop key="port">3306</prop> <prop key="user">root</prop> </props> </property> </bean> </beans>
c、测试
import com.wt.pojo.Student; import org.junit.Test; import org.springframework.context.ApplicationContext; import org.springframework.context.support.ClassPathXmlApplicationContext; public class MyTest { @Test public void getStudent(){ ApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml"); Student userInfo = (Student) context.getBean("student"); System.out.println(userInfo.toString()); } }
4、其它方式注入
A、p命名空间
property
xml格式 引入p="***"
<beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:p="http://www.springframework.org/schema/p" xsi:schemaLocation="http://www.springframework.org/schema/beans https://www.springframework.org/schema/beans/spring-beans.xsd"> </beans>
例子
<bean id="user" class="com.wt.pojo.User"> <property name="name" value="tom"/> <property name="age" value="18"/> </bean> <bean id="user2" class="com.wt.pojo.User" p:name="loss" p:age="34"/>
两个bean标签的效果是一样的
B、c命名空间(有含参构成函数)
构造器注入
xml文件 添加 c="*****"
<beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:c="http://www.springframework.org/schema/c" xsi:schemaLocation="http://www.springframework.org/schema/beans https://www.springframework.org/schema/beans/spring-beans.xsd"> </beans>
例子
<bean id="user3" class="com.wt.pojo.User"> <constructor-arg name="name" value="gg"/> <constructor-arg name="age" value="45"/> </bean> <bean id="user4" class="com.wt.pojo.User" c:name="死侍" c:age="100"/>
上述两种情况一致
标签:obb ram rri pre 标签 依赖注入 span oss release
原文地址:https://www.cnblogs.com/wt7018/p/13337300.html