详解Spring基于xml的两种依赖注入方式
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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