spring中bean的Resources(7)

最新推荐文章于 2021-08-31 19:10:50 发布

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本文介绍了Spring框架中资源文件的六种加载方式，包括通过URL、类路径、文件系统、ServletContext、输入流及字节数组等方式加载资源。并提供了一个具体的实现示例，展示了如何在实际应用中使用这些资源加载方式。

2016/1/16 13:53:12

1.Resources

针对于资源文件的统一接口
Resources
- UrlResource:URL对应的资源,根据一个URL地址即可创建
- ClassPathResource:获取类路径下的资源文件
- FileSystemResource:获取文件系统里面的资源
- ServletContextResource:ServletContext封装的资源,用于访问ServletContext环境下的资源
- InputStreamResource:针对输入流封装的资源
- ByteArrayResource:针对于字节数封装的资源

2.ResourceLoader

XML:spring-resource.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans  xmlns="http://www.springframework.org/schema/beans" 
        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
        xmlns:p="http://www.springframework.org/schema/p" 
        xmlns:aop="http://www.springframework.org/schema/aop" 
        xmlns:tx="http://www.springframework.org/schema/tx" 
        xmlns:mvc="http://www.springframework.org/schema/mvc" 
        xmlns:context="http://www.springframework.org/schema/context" 
        xsi:schemaLocation="http://www.springframework.org/schema/beans
                            http://www.springframework.org/schema/beans/spring-beans-3.0.xsd 
                            http://www.springframework.org/schema/context
                            http://www.springframework.org/schema/context/spring-context-3.0.xsd 
                            http://www.springframework.org/schema/aop
                            http://www.springframework.org/schema/aop/spring-aop-3.0.xsd 
                            http://www.springframework.org/schema/tx
                            http://www.springframework.org/schema/tx/spring-tx-3.0.xsd 
                            http://www.springframework.org/schema/mvc
                            http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd"> 

        <bean id="resource" class="com.zjx.resource.Resource"></bean>

</beans>

bean类:

package com.zjx.resource;

import java.io.IOException;

import org.springframework.beans.BeansException;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;

public class Resource implements ApplicationContextAware {
    private ApplicationContext applicationContext;

    @Override
    public void setApplicationContext(ApplicationContext arg0)
            throws BeansException {
        this.applicationContext = arg0; 
    }

    public void resource() throws IOException{
        org.springframework.core.io.Resource resource = this.applicationContext.getResource("classpath:jdbc.properties");
        System.out.println(resource.getFilename());
        System.out.println(resource.contentLength());
    }

}

测试:

package com.zjx.interfaces.test;

import java.io.IOException;

import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.BlockJUnit4ClassRunner;

import com.zjx.resource.Resource;

@RunWith(BlockJUnit4ClassRunner.class)
public class TestResource extends UnitTestBase{
    public TestResource() {
        super("spring-resource.xml");
    }
    @Test
    public void test() throws IOException{
        Resource resource = super.getBean("resource");
        resource.resource();
    }
}