spring学习笔记之---bean属性注入
2024-10-01 11:06:17
bean属性注入
（一）构造方法的属性注入
1.Student.java
package entity;
public class Student {
private String name;
private String age;
public Student(String name, String age) {
this.name = name;
this.age = age;
}
@Override
public String toString() {
return "Student{" +
"name='" + name + '\'' +
", age='" + age + '\'' +
'}';
}
}
2.applicationContext.xml
<?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="student" class="entity.Student">
<constructor-arg name="name" value="李四"/>
<constructor-arg name="age" value="21"/>
</bean>
</beans>
3.StudentTest.java
package Test;
import entity.Student;
import entity.User;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
public class StudentTest {
@Test
public void stu(){
ApplicationContext applicationContext=new ClassPathXmlApplicationContext("applicationContext.xml");
Student student=(Student)applicationContext.getBean("student");
System.out.println(student);
}
}
（二）set方法的属性注入
1.Student.java
package entity;
public class Student {
private String name;
private String age;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getAge() {
return age;
}
public void setAge(String age) {
this.age = age;
}
@Override
public String toString() {
return "Student{" +
"name='" + name + '\'' +
", age='" + age + '\'' +
'}';
}
}
2.applicationContext.xml
<?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="student2" class="entity.Student">
<property name="name" value="张三"/>
<property name="age" value="22"/>
</bean>
</beans>
3.StudentTest.java
package Test;
import entity.Student;
import entity.User;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
public class StudentTest {
@Test
public void stu2(){
ApplicationContext applicationContext=new ClassPathXmlApplicationContext("applicationContext.xml");
Student student2=(Student)applicationContext.getBean("student2");
System.out.println(student2);
}
}
（三）p名称空间的属性注入
1.Student.java
package entity;
public class Student {
private String name;
private String age;
private Cat cat;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getAge() {
return age;
}
public void setAge(String age) {
this.age = age;
}
public Cat getCat() {
return cat;
}
public void setCat(Cat cat) {
this.cat = cat;
}
@Override
public String toString() {
return "Student{" +
"name='" + name + '\'' +
", age='" + age + '\'' +
", cat=" + cat +
'}';
}
}
2.Cat.java
package entity;
public class Cat {
private String name;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
@Override
public String toString() {
return "Cat{" +
"name='" + name + '\'' +
'}';
}
}
3.applicationContext.xml
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:p="http://www.springframework.org/schema/p"
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="student3" class="entity.Student" p:name="小明" p:age="15" p:cat-ref="cat"/>
<bean id="cat" class="entity.Cat" p:name="小黄"/>
</beans>
4.StudentTest.java
package Test;
import entity.Student;
import entity.User;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
public class StudentTest {
@Test
public void stu3(){
ApplicationContext applicationContext=new ClassPathXmlApplicationContext("applicationContext.xml");
Student student3=(Student)applicationContext.getBean("student3");
System.out.println(student3);
}
}
（四）spel的属性注入
1.Student.java
package entity;
public class Student {
private String name;
private String age;
private Cat cat;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getAge() {
return age;
}
public void setAge(String age) {
this.age = age;
}
public Cat getCat() {
return cat;
}
public void setCat(Cat cat) {
this.cat = cat;
}
@Override
public String toString() {
return "Student{" +
"name='" + name + '\'' +
", age='" + age + '\'' +
", cat=" + cat +
'}';
}
}
2.Cat.java
package entity;
public class Cat {
private String name;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
@Override
public String toString() {
return "Cat{" +
"name='" + name + '\'' +
'}';
}
}
3.applicationContext.xml
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:p="http://www.springframework.org/schema/p"
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="student4" class="entity.Student">
<property name="name" value="#{'大名'}"/>
<property name="age" value="#{16}"/>
<property name="cat" value="#{cat}"/>
</bean>
<bean id="cat" class="entity.Cat">
<property name="name" value="#{'大黄'}"/>
</bean>
</beans>
4.StudentTest.java
package Test;
import entity.Student;
import entity.User;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
public class StudentTest {
@Test
public void stu4(){
ApplicationContext applicationContext=new ClassPathXmlApplicationContext("applicationContext.xml");
Student student4=(Student)applicationContext.getBean("student4");
System.out.println(student4);
}
}
（五）复杂类型的属性注入
1.Bean.java
package entity;
import java.util.*;
public class Bean {
private String arr[];//数组类型
private List<String > list;//List集合类型
private Set<String> set;//Set集合类型
private Map<String,Integer> map;//Map集合类型
private Properties properties;//属性类型
public String[] getArr() {
return arr;
}
public void setArr(String[] arr) {
this.arr = arr;
}
public List<String> getList() {
return list;
}
public void setList(List<String> list) {
this.list = list;
}
public Set<String> getSet() {
return set;
}
public void setSet(Set<String> set) {
this.set = set;
}
public Map<String, Integer> getMap() {
return map;
}
public void setMap(Map<String, Integer> map) {
this.map = map;
}
public Properties getProperties() {
return properties;
}
public void setProperties(Properties properties) {
this.properties = properties;
}
@Override
public String toString() {
return "Bean{" +
"arr=" + Arrays.toString(arr) +
", list=" + list +
", set=" + set +
", map=" + map +
", properties=" + properties +
'}';
}
}
2.applicationContext.xml
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:p="http://www.springframework.org/schema/p"
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="bean" class="entity.Bean">
<!--数组类型-->
<property name="arr">
<list >
<value>aaa</value>
<value>bbb</value>
<value>ccc</value>
</list>
</property>
<!--List集合类型-->
<property name="list">
<list>
<value>111</value>
<value>222</value>
<value>333</value>
</list>
</property>
<!--Set集合类型-->
<property name="set">
<set>
<value>aaa</value>
<value>bbb</value>
<value>ccc</value>
</set>
</property>
<!--Map集合类型-->
<property name="map">
<map>
<entry key="aaa" value="111"/>
<entry key="bbb" value="222"/>
<entry key="ccc" value="333"/>
</map>
</property>
<!--属性类型-->
<property name="properties">
<props>
<prop key="username">111</prop>
<prop key="password">222</prop>
</props>
</property>
</bean>
</beans>
3.BeanTest.java
package Test;
import entity.Bean;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
public class BeanTest {
@Test
public void bean(){
ApplicationContext applicationContext=new ClassPathXmlApplicationContext("applicationContext.xml");
Bean bean=(Bean)applicationContext.getBean("bean");
System.out.println(bean);
}
}
最新文章
- BZOJ 1105: [POI2007]石头花园SKA
- GR32 TImage32的图层绘制原理
- poj3159 Candies(差分约束，dij+heap)
- 如何用 matlab 在图片上绘制矩形框 和 添加文字 ？
- 将Java程序作成exe文件的几种方法【转载】
- C#中提供的精准测试程序运行时间的类Stopwatch
- HDJ -- 1022
- WCF - 实例与会话
- Class Fxp\Composer\AssetPlugin\Repository\NpmRepository does not exist
- COJ 1010 WZJ的数据结构（十） 线段树区间操作
- vim的命令集合
- 【转载】Xcode6中添加pch文件
- JS - 侧边导航收缩伸展
- 剑指offer编程题Java实现——面试题11数值的整数次方
- Django笔记--模型
- STL——string
- Bootstrap3基础 form-horizontal 表单元素横向布局 简单示例
- java super的用法
- Android开发日常-listVIiew嵌套webView回显阅读位置
- c# List使用中遇到的问题
热门文章
- ZOJ 3962：Seven Segment Display（思维）
- 自我救赎 → 利用 IDEA 和 Spring Boot 搭建 SSM
- pycharm在服务器上远程调试 mac版本
- Noip 2016 天天爱跑步 题解
- 解决springboot项目请求出现非法字符问题 java.lang.IllegalArgumentException:Invalid character found in the request target. The valid characters are defined in RFC 7230 and RFC 3986
- C# Winform --xml文件
- xx.exe 中的 0x014180bd 处有未经处理的异常: 0xC0000005: 读取位置 0xfeeefeee 时发生访问冲突（当指针访问异常时，应考虑是不是对象未创建）。
- list模板题
- C#各版本新增加功能
- [leetcode] 929. Unique Email Addresses (easy)