Spring学习一之IOC工作原理 2

上一篇简单介绍了依赖，这一篇把第一篇的内容重构。

重构代码：

创建HelloStr接口：

/**
 * 
 */
package com.nantian.spring.example2;

/**
 * @author ps
 *
 */
public interface HelloStr {
	public String getContent();
}

其次声明FileHelloStr类，实现HelloStr接口：

/**
 * 
 */
package com.nantian.spring.example2;

import java.io.InputStream;
import java.util.Properties;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

/**
 * @author ps
 *
 */
public class FileHelloStr implements HelloStr {
	protected static final Log log = LogFactory.getLog(FileHelloStr.class);
	private String profilename;
	
	public FileHelloStr(String profilename) {
		this.profilename = profilename;
	}
	/* (non-Javadoc)
	 * @see com.nantian.spring.example2.HelloStr#getContent()
	 */
	@Override
	public String getContent() {
		String helloWorld = "";
		
		try{
			Properties properties = new Properties();
			InputStream is = getClass().getClassLoader().getResourceAsStream(profilename);
			properties.load(is);
			is.close();
			helloWorld = properties.getProperty("helloworld");
		}catch (Exception e) {
			log.error(e.getMessage());
		}
		
		return helloWorld;
	}

}

重构HelloWorld类：

/**
 * 
 */
package com.nantian.spring.example2;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

/**
 * @author ps
 *
 */
public class HelloWorld {
	protected static final Log log = LogFactory.getLog(HelloWorld.class);
	private HelloStr helloStr;
	
	public HelloWorld(HelloStr helloStr) {
		this.helloStr = helloStr;
	}
	
	public String getContent(){
		return helloStr.getContent();
	}
}

还要重构HelloWorldClient类：

/**
 * 
 */
package com.nantian.spring.example2;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

/**
 * @author ps
 *
 */
public class HelloWorldClient {
	protected static final Log log = LogFactory.getLog(HelloWorldClient.class);
	/**
	 * @param args
	 */
	public static void main(String[] args) {
		FileHelloStr fileHelloStr = new FileHelloStr("helloworld.properties");
		HelloWorld helloWorld = new HelloWorld(fileHelloStr);
		log.info(helloWorld.getContent());
	}

}

 

运行其输出结果跟上一篇一样。