springBean参数注入的几个方法
1、普通方式注入
applicationContext.xml
1 <?xml version="1.0" encoding="UTF-8"?> 2 <beans xmlns="http://www.springframework.org/schema/beans" 3 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 4 xsi:schemaLocation="http://www.springframework.org/schema/beans 5 http://www.springframework.org/schema/beans/spring-beans.xsd"> 6 7 <bean id="person" class="com.xiaostudy.service.PersonImple"> 8 <property name="id" value="2018"></property> 9 <property name="name" value="xiaostudy"></property> 10 <property name="age" value="23"></property> 11 </bean> 12 </beans>
PersonImple.java
1 package com.xiaostudy.service; 2 3 public class PersonImple implements Person { 4 5 private Integer id; 6 private String name; 7 private Integer age; 8 9 public Integer getId() { 10 return id; 11 } 12 13 public void setId(Integer id) { 14 this.id = id; 15 } 16 17 public String getName() { 18 return name; 19 } 20 21 public void setName(String name) { 22 this.name = name; 23 } 24 25 public Integer getAge() { 26 return age; 27 } 28 29 public void setAge(Integer age) { 30 this.age = age; 31 } 32 33 @Override 34 public String toString() { 35 return "PersonImple [id=" + id + ", name=" + name + ", age=" + age + "]"; 36 } 37 38 }
2、通过构造方法的注入，name为参数名称
applicationContext.xml
1 <?xml version="1.0" encoding="UTF-8"?> 2 <beans xmlns="http://www.springframework.org/schema/beans" 3 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 4 xsi:schemaLocation="http://www.springframework.org/schema/beans 5 http://www.springframework.org/schema/beans/spring-beans.xsd"> 6 7 <bean id="person" class="com.xiaostudy.service.PersonImple"> 8 <constructor-arg name="id" value="2018"></constructor-arg> 9 <constructor-arg name="name" value="xiaostudy"></constructor-arg> 10 <constructor-arg name="age" value="23"></constructor-arg> 11 </bean> 12 </beans>
PersonImple.java
1 package com.xiaostudy.service; 2 3 public class PersonImple implements Person { 4 5 private Integer id; 6 private String name; 7 private Integer age; 8 9 public PersonImple(Integer id, String name, Integer age) { 10 this.id = id; 11 this.name = name; 12 this.age = age; 13 } 14 15 public Integer getId() { 16 return id; 17 } 18 19 public void setId(Integer id) { 20 this.id = id; 21 } 22 23 public String getName() { 24 return name; 25 } 26 27 public void setName(String name) { 28 this.name = name; 29 } 30 31 public Integer getAge() { 32 return age; 33 } 34 35 public void setAge(Integer age) { 36 this.age = age; 37 } 38 39 @Override 40 public String toString() { 41 return "PersonImple [id=" + id + ", name=" + name + ", age=" + age + "]"; 42 } 43 44 }
3、也是通过构造方法注入，index为参数索引的位置
applicationContext.xml
1 <?xml version="1.0" encoding="UTF-8"?> 2 <beans xmlns="http://www.springframework.org/schema/beans" 3 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 4 xsi:schemaLocation="http://www.springframework.org/schema/beans 5 http://www.springframework.org/schema/beans/spring-beans.xsd"> 6 7 <bean id="person" class="com.xiaostudy.service.PersonImple"> 8 <constructor-arg index="0" value="2018"></constructor-arg> 9 <constructor-arg index="1" value="xiaostudy"></constructor-arg> 10 <constructor-arg index="2" value="23"></constructor-arg> 11 </bean> 12 </beans>
4、也是通过构造方法注入，type是参数的数据类型
applicationContext.xml
1 <?xml version="1.0" encoding="UTF-8"?> 2 <beans xmlns="http://www.springframework.org/schema/beans" 3 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 4 xsi:schemaLocation="http://www.springframework.org/schema/beans 5 http://www.springframework.org/schema/beans/spring-beans.xsd"> 6 7 <bean id="person" class="com.xiaostudy.service.PersonImple"> 8 <constructor-arg type="java.lang.Integer" value="2018" index="0"></constructor-arg> 9 <constructor-arg type="java.lang.String" value="xiaostudy" index="1"></constructor-arg> 10 <constructor-arg type="java.lang.Integer" value="23" index="2"></constructor-arg> 11 </bean> 12 </beans>
