快速上手Spring 加载Bean配置文件-Java频道-中国IT实验室

1. 创建项目

    新建一个 Project：SpringBeanFile，注意要导入用户库Spring.

    这是完成后整个项目的结构（预览一下）：项目源码（不包含库文件）：？javamxj  Spring目录下面。

2. 编写类文件

    下面开始创建一个新类：BeanFile ；包名：javamxj.spring.beanfile

BeanFile.java
package javamxj.spring.beanfile;

public class BeanFile {

    private String beanFile = "多种方式加载Bean的配置文件";

    public void setBeanFile(String beanFile) {
        this.beanFile = beanFile;
    }

    public String getBeanFile() {
        return beanFile;
    }
}
新建Test.java，测试一下。
package javamxj.spring.beanfile;

import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.InputStream;

import org.springframework.beans.factory.BeanFactory;
import org.springframework.beans.factory.support.BeanDefinitionRegistry;
import org.springframework.beans.factory.support.DefaultListableBeanFactory;
import org.springframework.beans.factory.support.PropertiesBeanDefinitionReader;
import org.springframework.beans.factory.xml.XmlBeanFactory;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import org.springframework.core.io.ClassPathResource;
import org.springframework.core.io.FileSystemResource;
import org.springframework.core.io.InputStreamResource;
import org.springframework.core.io.Resource;

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

        // 直接调用HelloBean
        BeanFile bf = new BeanFile();
        System.out.println(bf.getBeanFile());

        /**
         * 利用XmlBeanFactory(Resource resource)
         * 这里Resource必须是xml格式
         * Resource包括：AbstractResource, ClassPathResource, FileSystemResource,
         * InputStreamResource, ServletContextResource, UrlResource
         */

        /*
         * 利用 InputStreamResource(InputStream inputStream)
         * 要将bean.xml放在项目根目录下
         */
        InputStream is = null;
        try {
            is = new FileInputStream("bean1.xml");
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        }
        Resource resource = new InputStreamResource(is);
        sayHello(resource);

        /*
         * 利用 ClassPathResource(String path)
         * 要将bean.xml放在源文件夹（src）目录下
         */
        resource = new ClassPathResource("bean2.xml");
        sayHello(resource);

        /*
         * 利用 FileSystemResource(String path)
         * 要将bean.xml放在项目根目录下
         */
        resource = new FileSystemResource("bean3.xml");
        sayHello(resource);

        /*
         * 利用 Properties
         * 要将bean.properties放在类路径－－源文件夹（src）目录下
         */
        BeanDefinitionRegistry reg = new DefaultListableBeanFactory();
        PropertiesBeanDefinitionReader reader = new PropertiesBeanDefinitionReader(
                reg);
        reader.loadBeanDefinitions(new ClassPathResource("bean.properties"));
        BeanFactory factory = (BeanFactory) reg;

        bf = (BeanFile) factory.getBean("beanFile");
        System.out.println("利用 " + bf.getBeanFile() + " 加载 Bean.properties");
       

        /*
         * 利用 ApplicationContext
         * 要将bean.xml放在类路径－－源文件夹（src）目录下
         */
        ApplicationContext appContext = new ClassPathXmlApplicationContext(
                "bean4.xml");
        bf = (BeanFile) appContext.getBean("beanFile");
        System.out.println("利用 " + bf.getBeanFile() + " 加载 Bean.xml");

    }

    public static void sayHello(Resource resource) {
        BeanFactory factory = new XmlBeanFactory(resource);
        BeanFile bf = (BeanFile) factory.getBean("beanFile");
        System.out.println("利用 " + bf.getBeanFile() + " 加载 Bean.xml");
    }
}

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【责编:Chuan】

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