Question

我尝试学习Spring。我关注此网站http://www.roseindia.net/spring/spring3/spring-3-hello-world.shtml

我尝试了一个例子。我正在使用下面的一些内容，但这里显示：

不推荐使用XmlBeanFactory类型

我必须使用什么作为替代方案？

public class SpringHelloWorldTest {
    public static void main(String[] args) {

        XmlBeanFactory beanFactory = new XmlBeanFactory(new ClassPathResource("SpringHelloWorld.xml"));

        Spring3HelloWorld myBean = (Spring3HelloWorld)beanFactory.getBean("Spring3HelloWorldBean");
        myBean.sayHello();
    }
}

Answer 1

ApplicationContext是BeanFactory的子接口。您可以使用这种方式

public class SpringHelloWorldTest {
    public static void main(String[] args) {
        ApplicationContext context= new ClassPathXmlApplicationContext("SpringHelloWorld.xml");
        Spring3HelloWorld myBean= (Spring3HelloWorld) context.getBean("Spring3HelloWorldBean");
        myBean.sayHello();
    }
}

Answer 2

这是替代码，

public static void main(String[] args){
    ApplicationContext context=new ClassPathXmlApplicationContext(new String[]{"SpringHelloWorld.xml"});
    BeanFactory factory=context;
    Spring3HelloWorld myBean=(Spring3HelloWorld)factory.getBean("Spring3HelloWorldBean");
    myBean.sayHello();
}

Answer 3

BeanDefinitionRegistry beanDefinitionRegistry = new DefaultListableBeanFactory();
XmlBeanDefinitionReader reader = new XmlBeanDefinitionReader(beanDefinitionRegistry);
reader.loadBeanDefinitions(new ClassPathResource("SPRING_CONFIGURATION_FILE"));

Answer 4

您可以使用ClassPathXmlApplicationContext类。

Answer 5

获取bean上下文的新方法（没有类转换）：

BeanDefinitionRegistry beanFactory = new DefaultListableBeanFactory();
XmlBeanDefinitionReader reader = new XmlBeanDefinitionReader(beanFactory);
reader.loadBeanDefinitions(new ClassPathResource("beans.xml"));

在启动应用程序范围的上下文时，应使用

ApplicationContext context = new ClassPathXmlApplicationContext("application.xml");

Answer 6

这是实施

的最佳方式

Resource res = new FileSystemResource("beans.xml");
XmlBeanFactory factory = new XmlBeanFactory(res);

or

ClassPathResource res = new ClassPathResource("beans.xml");
XmlBeanFactory factory = new XmlBeanFactory(res);

or

ClassPathXmlApplicationContext appContext = new ClassPathXmlApplicationContext(
       new String[] {"applicationContext.xml", "applicationContext-part2.xml"});
// of course, an ApplicationContext is just a BeanFactory
BeanFactory factory = (BeanFactory) appContext;

Answer 7

怎么样：

DefaultListableBeanFactory factory = new DefaultListableBeanFactory();
XmlBeanDefinitionReader reader = new XmlBeanDefinitionReader(factory);
reader.loadBeanDefinitions(new ClassPathResource("config/Beans.xml"));
Messager msg = (Messager) factory.getBean("Messager");

Answer 8

在Spring文档中找到的XMLBeanFactory的替代

GenericApplicationContext ctx = new GenericApplicationContext();
XmlBeanDefinitionReader xmlReader = new XmlBeanDefinitionReader(ctx);
xmlReader.loadBeanDefinitions(new 
ClassPathResource("applicationContext.xml"));
PropertiesBeanDefinitionReader propReader = new 
PropertiesBeanDefinitionReader(ctx);
propReader.loadBeanDefinitions(new 
ClassPathResource("otherBeans.properties"));
ctx.refresh();

MyBean myBean = (MyBean) ctx.getBean("myBean");

Answer 9

使用“ FileSystemXmlApplicationContext”作为

ApplicationContext  context =  new FileSystemXmlApplicationContext("SpringHelloWorld.xml");

Spring3HelloWorld myBean= (Spring3HelloWorld) context.getBean("Spring3HelloWorldBean");

myBean.sayHello();

Answer 10

警告“ 资源泄漏：'上下文'从未关闭”，并且给出了可接受的答案。

SO帖子Spring ApplicationContext - Resource leak: 'context' is never closed中建议的解决方案解决了该问题。

希望它可以帮助某人。

Answer 11

我认识到ApplicationContext和XmlBeanFactory在对象的运行时初始化方面存在巨大差异。

applicationcontext立即调用对象构造函数，从而立即创建对象。

仅当beanFactory.getBean（String name）被调用时，XmlBeanFactory才会创建一个对象。

如果这对问题域很重要，请尝试以下代码，作为等效于原始源的代码，避免使用XmlBeanFactory。

final Resource resource = new ClassPathResource("SpringHelloWorld.xml");
final DefaultListableBeanFactory beanFactory = new DefaultListableBeanFactory();
final XmlBeanDefinitionReader xmlBeanDefinitionReader = new XmlBeanDefinitionReader(beanFactory);
xmlBeanDefinitionReader.loadBeanDefinitions(resource);
Spring3HelloWorld myBean = beanFactory.getBean("Spring3HelloWorldBean", Spring3HelloWorld.class);
myBean.sayHello();

以下是使Obvious船长满意地进行比较的完整示例。

首先是模型Person.java。

package com.stackoverflow.questions_5231371;

// ./spring-tutorial/src/main/java/com/stackoverflow/questions_5231371/Person.java
public class Person {

    int id;
    String name;

    public Person() {
        System.out.println("calling Employee constructor");
    }

    public int getId() {
        return id;
    }

    public void setId(final int id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(final String name) {
        this.name = name;
    }

    @Override
    public String toString() {
        return "Person [id=" + id + ", name=" + name + "]";
    }
}

然后在personbeans.xml中添加对象数据。

<?xml version="1.0" encoding="UTF-8"?>
<!-- ./spring-tutorial/src/main/java/personbeans.xmlxml  -->
<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="p1" class="com.stackoverflow.questions_5231371.Person">
        <property name="id" value="1" />
        <property name="name" value="Sheldon" />    
    </bean>

    <bean id="p2" class="com.stackoverflow.questions_5231371.Person">
        <property name="id" value="2" />
        <property name="name" value="Penny" />  
    </bean>

    <bean id="p3" class="com.stackoverflow.questions_5231371.Person">
        <property name="id" value="3" />
        <property name="name" value="Leonard" />    
    </bean>

</beans>

还有调用对象的主要方法。

package com.stackoverflow.questions_5231371;

import org.springframework.beans.factory.support.DefaultListableBeanFactory;
import org.springframework.beans.factory.xml.XmlBeanDefinitionReader;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import org.springframework.core.io.ClassPathResource;
import org.springframework.core.io.Resource;

// ./spring-tutorial/src/main/java/com/stackoverflow/questions_5231371/Main.java
public class Main {

    public static void main(final String[] args) {
        // Spring #1 IoC application context
        System.out.println("--- ApplicationContext");
        final ApplicationContext context = new ClassPathXmlApplicationContext("personbeans.xml");
        System.out.println("context created ---");
        System.out.println(context.getBean("p1"));
        System.out.println(context.getBean("p2"));
        System.out.println(context.getBean("p3"));

        // Spring #2 IoC bean factory
        System.out.println("--- DefaultListableBeanFactory");
        final Resource resource = new ClassPathResource("personbeans.xml");
        final DefaultListableBeanFactory beanFactory = new DefaultListableBeanFactory();
        final XmlBeanDefinitionReader xmlBeanDefinitionReader = new XmlBeanDefinitionReader(beanFactory);
        xmlBeanDefinitionReader.loadBeanDefinitions(resource);
        System.out.println("bean definition loaded ---");
        System.out.println(beanFactory.getBean("p1"));
        System.out.println(beanFactory.getBean("p2"));
        System.out.println(beanFactory.getBean("p3"));
    }

}

最有趣的部分是在控制台输出中将输出“调用Employee构造函数”加载到构造函数时的比较。

--- ApplicationContext
calling Employee constructor
calling Employee constructor
calling Employee constructor
context created ---
Person [id=1, name=Sheldon]
Person [id=2, name=Penny]
Person [id=3, name=Leonard]
--- DefaultListableBeanFactory
bean definition loaded ---
calling Employee constructor
Person [id=1, name=Sheldon]
calling Employee constructor
Person [id=2, name=Penny]
calling Employee constructor
Person [id=3, name=Leonard]

Answer 12

我尝试了以下代码

    public class Spring3HelloWorldTest {
    public static void main(String[] args) {        
        DefaultListableBeanFactory  beanFactory = new DefaultListableBeanFactory ((BeanFactory) new ClassPathResource("SpringHelloWorld.xml"));     
        Spring3HelloWorld myBean = (Spring3HelloWorld) beanFactory.getBean("Spring3HelloWorldBean");
        myBean.sayHello();
    }
}

并且有效

不推荐使用Springs XmlBeanFactory

12 个答案: