标签:中国邮政 property getbean pat 姓名 code res xmla pre
要求被注入的属性 , 必须有set方法 , set方法的方法名由set + 属性首字母大写 , 如果属性是boolean类型 , 没有set方法 , 是 is .
测试pojo类 :
Address.java
public class Address {
private String address;
public String getAddress() {
return address;
}
public void setAddress(String address) {
this.address = address;
}
}
Student.java
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;
public void setName(String name) {
this.name = name;
}
public void setAddress(Address address) {
this.address = address;
}
public void setBooks(String[] books) {
this.books = books;
}
public void setHobbys(List<String> hobbys) {
this.hobbys = hobbys;
}
public void setCard(Map<String, String> card) {
this.card = card;
}
public void setGames(Set<String> games) {
this.games = games;
}
public void setWife(String wife) {
this.wife = wife;
}
public void setInfo(Properties info) {
this.info = info;
}
public void show(){
System.out.println("name="+ name
+ ",address="+ address.getAddress()
+ ",books="
);
for (String book:books){
System.out.print(book+"\t");
}
System.out.println("\n爱好:"+hobbys);
System.out.println("card:"+card);
System.out.println("games:"+games);
System.out.println("wife:"+wife);
System.out.println("info:"+info);
}
}
<bean id="student" class="com.maple.pojo.Student">
<property name="name" value="杜甫"/>
</bean>
测试:
@Test
public void test01(){
ApplicationContext context = newClassPathXmlApplicationContext("applicationContext.xml");
Student student = (Student) context.getBean("student");
System.out.println(student.getName());
}
注意点:这里的值是一个引用,ref
<bean id="addr" class="com.maple.pojo.Address">
<property name="address" value="成都"/>
</bean>
<bean id="student" class="com.maple.pojo.Student">
<property name="name" value="杜甫"/>
<property name="address" ref="addr"/>
</bean>
<bean id="student" class="com.maple.pojo.Student">
<property name="name" value="李白"/>
<!--这里的属性是另一个bean所以要使用ref-->
<property name="address" ref="addr"/>
<!--数组注入-->
<property name="books">
<!--基本数据类型可以省略value-type-->
<array value-type="java.lang.String">
<value>《西游记》</value>
<value>《红楼梦》</value>
<value>《水浒传》</value>
<value>《三国演义》</value>
</array>
</property>
</bean>
<!--List注入-->
<property name="hobbys">
<list>
<value>蹦迪</value>
<value>蹦极</value>
<value>酷跑</value>
<value>攀岩</value>
<value>饮酒</value>
<value>作诗</value>
</list>
</property>
<property name="card">
<map>
<entry key="中国工商" value="1547896548462566"/>
<entry key="中国邮政" value="1564774656164467"/>
</map>
</property>
<property name="games">
<set>
<value>LOL</value>
<value>COD16</value>
<value>CS GO</value>
</set>
</property>
<property name="wife"><null/></property>
8、Properties注入
常用于数据库连接配置等的注入
<property name="info">
<props>
<!--这里的值是写在<prop></prop>之间的而不是用value来指定-->
<prop key="学号">20200110</prop>
<prop key="性别">男</prop>
<prop key="姓名">杜甫</prop>
</props>
</property>
name=李白,address=成都,books=
《西游记》 《红楼梦》 《水浒传》 《三国演义》
爱好:[蹦迪, 蹦极, 酷跑, 攀岩, 饮酒, 作诗]
card:{中国工商=1547896548462566, 中国邮政=1564774656164467}
games:[LOL, COD16, CS GO]
wife:null
info:{学号=20200110, 性别=男, 姓名=杜甫}
p命名和c命名注入
User.java :【注意:这里没有有参构造器!】
public class User {
private String name;
private int age;
public void setName(String name) {
this.name = name;
}
public void setAge(int age) {
this.age = age;
}
@Override
public String toString() {
return "User{" +
"name=‘" + name + ‘\‘‘ +
", age=" + age +
‘}‘;
}
}
1、P命名空间注入 : 需要在头文件中加入约束文件
导入约束 : xmlns:p="http://www.springframework.org/schema/p"
<!--P(属性: properties)命名空间 , 属性依然要设置set方法-->
<bean id="user" class="com.maple.pojo.User" p:name="枫叶" p:age="20"/>
2、c 命名空间注入 : 需要在头文件中加入约束文件
导入约束 : xmlns:c="http://www.springframework.org/schema/c"
<!--C(构造: Constructor)命名空间 , 属性依然要设置set方法-->
<bean id="user" class="com.maple.pojo.User" c:name="枫叶" c:age="18"/>
发现问题:爆红了,刚才我们没有写有参构造!
解决:把有参构造器加上,这里也能知道,c 就是所谓的构造器注入!
测试代码:
@Test
public void test02(){
ApplicationContext context =newClassPathXmlApplicationContext("applicationContext.xml");
User user = (User) context.getBean("user");
System.out.println(user);
}
标签:中国邮政 property getbean pat 姓名 code res xmla pre
原文地址:https://www.cnblogs.com/junlinsky/p/12822235.html