Spring学习之创建对象实例的三种方式

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1、创建对象实例的三种方式我们知道可以通过Spring的IOC容器创建对象的实例，有三种方式：举例：UserDao接口UserDaoImpl实现类：UserDao接口：packagecom.workit.threestyle01;publicinterfaceUserDao{publicvoidprintInfo();}UserDaoImpl实现类：packagecom.workit.threestyle01;publicclassUserDaoImplimplementsUserDao{privateStri

2、ngjdbcUrl;privateStringdriverClass;privateStringusername;privateStringpassword;@OverridepublicvoidprintInfo(){System.out.println("jdbcUrl="+jdbcUrl);System.out.println("driverClass="+driverClass);System.out.println("username="+username);System.out.println(

3、"password="+password);}publicStringgetJdbcUrl(){returnjdbcUrl;}publicvoidsetJdbcUrl(StringjdbcUrl){this.jdbcUrl=jdbcUrl;}publicStringgetDriverClass(){returndriverClass;}publicvoidsetDriverClass(StringdriverClass){this.driverClass=driverClass;}publicStringg

4、etUsername(){returnusername;}publicvoidsetUsername(Stringusername){this.username=username;}publicStringgetPassword(){returnpassword;}publicvoidsetPassword(Stringpassword){this.password=password;}}beanFactory:packagecom.workit.threestyle01;publicclassBeanFa

5、ctory{publicstaticUserDaonewInstanceByStaticMethod(){System.out.println("BeanFactoryByStaticMethod.newInstanceByStaticMethod()");returnnewUserDaoImpl();}publicUserDaonewInstanceByUnStaticMethod(){System.out.println("BeanFactoryByStaticMethod.newInstanceByU

6、nStaticMethod()");returnnewUserDaoImpl();}}三种方式的配置文件的配置：applicationContext.xmll通过类的全限定名利用反射创建：