详解Spring基于xml的两种依赖注入方式

2023-08-03 19:11:05 485

1）使用构造器注入bean

实体类：用户类

publicclassUser{
privateStringname;
privateUserMessageuserMessage;

publicUser(){
}

publicUser(Stringname,UserMessageuserMessage){
this.name=name;
this.userMessage=userMessage;
}

publicStringgetName(){
returnname;
}

publicvoidsetName(Stringname){
this.name=name;
}

publicUserMessagegetUserMessage(){
returnuserMessage;
}

publicvoidsetUserMessage(UserMessageuserMessage){
this.userMessage=userMessage;
}

@Override
publicStringtoString(){
return"User{"+"name='"+name+'\''+",userMessage="+userMessage+'}';
}
}

实体类：用户信息类

publicclassUserMessage{
privateStringusername;
privateStringpassword;

publicUserMessage(){
}

publicUserMessage(Stringusername,Stringpassword){
this.username=username;
this.password=password;
}

publicStringgetUsername(){
returnusername;
}

publicvoidsetUsername(Stringusername){
this.username=username;
}

publicStringgetPassword(){
returnpassword;
}

publicvoidsetPassword(Stringpassword){
this.password=password;
}

@Override
publicStringtoString(){
return"UserMessage{"+"username='"+username+'\''+",password='"+password+'\''+'}';
}
}

配置文件

测试类

publicclassTestDI{
@Test
publicvoidtest(){
ApplicationContextac=newClassPathXmlApplicationContext("applicationContext.xml");
Useruser=ac.getBean("user",User.class);
System.out.println(user);
}
}

测试结果

User{name='tom',userMessage=UserMessage{username='scott',password='tiger'}}

2）使用setter方法注入bean

实体类：用户类

publicclassUser{
privateStringname;
privateUserMessageuserMessage;

publicUser(){
}

publicUser(Stringname,UserMessageuserMessage){
this.name=name;
this.userMessage=userMessage;
}

publicStringgetName(){
returnname;
}

publicvoidsetName(Stringname){
this.name=name;
}

publicUserMessagegetUserMessage(){
returnuserMessage;
}

publicvoidsetUserMessage(UserMessageuserMessage){
this.userMessage=userMessage;
}

@Override
publicStringtoString(){
return"User{"+"name='"+name+'\''+",userMessage="+userMessage+'}';
}
}

实体类：用户信息类

publicclassUserMessage{
privateStringusername;
privateStringpassword;

publicUserMessage(){
}

publicUserMessage(Stringusername,Stringpassword){
this.username=username;
this.password=password;
}

publicStringgetUsername(){
returnusername;
}

publicvoidsetUsername(Stringusername){
this.username=username;
}

publicStringgetPassword(){
returnpassword;
}

publicvoidsetPassword(Stringpassword){
this.password=password;
}

@Override
publicStringtoString(){
return"UserMessage{"+"username='"+username+'\''+",password='"+password+'\''+'}';
}
}

配置文件

测试类

publicclassTestDI{
@Test
publicvoidtest(){
ApplicationContextac=newClassPathXmlApplicationContext("applicationContext.xml");
Useruser=ac.getBean("user",User.class);
System.out.println(user);
}
}

测试结果

User{name='tom',userMessage=UserMessage{username='scott',password='tiger'}}

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详解Spring基于xml的两种依赖注入方式

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