一、引言

        做檔案上傳解析時，一個上傳入口往往會上傳多種型別的待解析檔案或者上傳的壓縮包包含多種型別待解析檔案，或者多個上傳入口呼叫後臺同一個介面。本文基於這樣的場景，在滿足多用組合、少用繼承的原則下，設計了工廠+策略+模板方法設計模式實現業務需求。具體實現如下：

二、業務介面

package com.test.oneFactoryAndStrategySystem;

/**
 * @author admin
 * 解析檔案呼叫介面
 */
public interface IService
{
	/**
	 * <解析檔案呼叫介面>
	 * @param inPutPath
	 * @param outPathPath
	 * @param typeId
	 * @return
	 */
	String parse(String inPutPath,String outPathPath,int typeId);
}
 

三、業務介面實現類

package com.test.oneFactoryAndStrategySystem.Impl;

import com.test.oneFactoryAndStrategySystem.IService;
import com.test.oneFactoryAndStrategySystem.factory.AnalysisStrateGyFactory;
import com.test.oneFactoryAndStrategySystem.strategy.AbstractStrategyTemplate;

/**
 * @author admin
 *
 */
public class SomeService implements IService
{
	/*
	 * 解析介面實現方法
	 */
	@Override
	public String parse(String inPutPath, String outPathPath, int typeId)
	{
		AbstractStrategyTemplate handle = AnalysisStrateGyFactory.buildStratey(inPutPath, outPathPath, typeId);
		long successNum = handle.analysis();
		String message = "成功解析" + successNum + "條資料";
		return message;
	}

}
 

四、選擇策略工廠

package com.test.oneFactoryAndStrategySystem.factory;

import com.test.oneFactoryAndStrategySystem.strategy.AbstractStrategyTemplate;
import com.test.oneFactoryAndStrategySystem.strategy.CSVAnalysisHandle;
import com.test.oneFactoryAndStrategySystem.strategy.ExcelAnalysisHandle;
import com.test.oneFactoryAndStrategySystem.strategy.XMLAnalysisHandle;

/**
 * @author admin
 * 選擇策略工廠
 */
public class AnalysisStrateGyFactory
{
	public static AbstractStrategyTemplate buildStratey(String inPutPath, String outPathPath, int typeId)
	{
		AbstractStrategyTemplate handle = null;
		//根據需要檔案typeId選擇具體策略
		switch(typeId)
		{
			case 101:
				//解析CSV檔案
				handle = new CSVAnalysisHandle(inPutPath, outPathPath, typeId);
				break;
			case 102:
				//解析Excel檔案
				handle = new ExcelAnalysisHandle(inPutPath, outPathPath, typeId);
				break;
			case 103:
				//解析XML檔案
				handle = new XMLAnalysisHandle(inPutPath, outPathPath, typeId);
				break;
		}
		return handle;
	}
}
 

五、模板方法

package com.test.oneFactoryAndStrategySystem.strategy;

/**
 * @author admin
 * 模板方法
 */
public abstract class AbstractStrategyTemplate
{
	/**
	 * 檔案型別是否正確
	 */
	public final boolean checkFileType(String inputPath,String suffix)
	{
		if(inputPath.endsWith(suffix))
		{
			return true;
		}
		return false;
	}
	
	/**
	 * 檔案解析主方法
	 */
	public abstract long analysis();
	
	/**
	 * 鉤子方法，子類可重寫
	 */
	public void writeFile(String outPathPath)
	{
		System.out.println("預設寫出CSV檔案");
	}
}

六、策略一

package com.test.oneFactoryAndStrategySystem.strategy;

import org.apache.log4j.Logger;

/**
 * @author admin
 * 解析CSV型別檔案handle
 *
 */
public class CSVAnalysisHandle extends AbstractStrategyTemplate
{
	private static Logger logger = Logger.getLogger(CSVAnalysisHandle.class);
	/**
	 * 檔案輸入路徑
	 */
	private String inPutPath;
	
	/**
	 * 檔案輸出路徑
	 */
	private String outPathPath;
	
	/**
	 * 檔案型別
	 */
	private int typeId;
	
	public CSVAnalysisHandle()
	{
	}

	public CSVAnalysisHandle(String inPutPath, String outPathPath, int typeId)
	{
		super();
		this.inPutPath = inPutPath;
		this.outPathPath = outPathPath;
		this.typeId = typeId;
	}

	@Override
	public long analysis()
	{
		//成功解析條數計數
		long successNum = 0;
		//判斷是否為需要解析的檔案
		//檔案型別正確，並且typeId正確
		if(checkFileType(inPutPath, ".csv") && typeId == 101)
		{
			System.out.println("解析"+ typeId + "型別的CSV檔案，並返回成功解析條數");
			//成功解析10條檔案
			successNum = 10;
			//使用預設寫出方法，寫出CSV檔案
			writeFile(outPathPath);
		}
		else
		{
			logger.error("file type is error");
			return 0;
		}
		return successNum;
	}

}

七、策略2

package com.test.oneFactoryAndStrategySystem.strategy;

import org.apache.log4j.Logger;

/**
 * @author admin
 * 解析Excel型別檔案handle
 *
 */
public class ExcelAnalysisHandle extends AbstractStrategyTemplate
{
	private static Logger logger = Logger.getLogger(ExcelAnalysisHandle.class);
	/**
	 * 檔案輸入路徑
	 */
	private String inPutPath;
	
	/**
	 * 檔案輸出路徑
	 */
	private String outPathPath;
	
	/**
	 * 檔案型別
	 */
	private int typeId;
	
	public ExcelAnalysisHandle()
	{
	}

	public ExcelAnalysisHandle(String inPutPath, String outPathPath, int typeId)
	{
		super();
		this.inPutPath = inPutPath;
		this.outPathPath = outPathPath;
		this.typeId = typeId;
	}

	@Override
	public long analysis()
	{
		//成功解析條數計數
		long successNum = 0;
		//判斷是否為需要解析的檔案
		//檔案型別正確，並且typeId正確
		if(checkFileType(inPutPath, ".xlsx") && typeId == 102)
		{
			System.out.println("解析"+ typeId + "型別的xml檔案，並返回成功解析條數");
			//成功解析10條檔案
			successNum = 10;
			//使用預設寫出方法，寫出xml檔案
			writeFile(outPathPath);
		}
		else
		{
			logger.error("file type is error");
			return 0;
		}
		return successNum;
	
	}

}

八、策略3

package com.test.oneFactoryAndStrategySystem.strategy;

import org.apache.log4j.Logger;

/**
 * @author admin
 * 解析XML型別檔案handle
 *
 */
public class XMLAnalysisHandle extends AbstractStrategyTemplate
{
	private static Logger logger = Logger.getLogger(ExcelAnalysisHandle.class);
	/**
	 * 檔案輸入路徑
	 */
	private String inPutPath;
	
	/**
	 * 檔案輸出路徑
	 */
	private String outPathPath;
	
	/**
	 * 檔案型別
	 */
	private int typeId;
	
	public XMLAnalysisHandle()
	{
	}

	public XMLAnalysisHandle(String inPutPath, String outPathPath, int typeId)
	{
		super();
		this.inPutPath = inPutPath;
		this.outPathPath = outPathPath;
		this.typeId = typeId;
	}

	@Override
	public long analysis()
	{

		//成功解析條數計數
		long successNum = 0;
		//判斷是否為需要解析的檔案
		//檔案型別正確，並且typeId正確
		if(checkFileType(inPutPath, ".xml") && typeId == 103)
		{
			System.out.println("解析"+ typeId + "型別的xml檔案，並返回成功解析條數");
			//成功解析10條檔案
			successNum = 10;
			//使用預設寫出方法，寫出xml檔案
			writeFile(outPathPath);
		}
		else
		{
			logger.error("file type is error");
			return 0;
		}
		return successNum;
	}
	
	/*
	 * 重寫鉤子方法，寫出Excel檔案
	 */
	@Override
	public void writeFile(String outPathPath)
	{
		System.out.println("寫出Excel檔案");
	}
}

九、Test

package com.test.oneFactoryAndStrategySystem.test;

import org.junit.After;
import org.junit.Before;
import org.junit.Test;

import com.test.oneFactoryAndStrategySystem.IService;
import com.test.oneFactoryAndStrategySystem.Impl.SomeService;

/**
 * @author admin
 * 測試類
 *
 */
public class MyTest
{
	/**
	 * 解析呼叫
	 */
	private IService service;
	
	/**
	 * 檔案輸入路徑
	 */
	private String inPutPath;
	
	/**
	 * 檔案輸出路徑
	 */
	private String outPathPath;
	
	/**
	 * 檔案型別
	 */
	private int typeId;
	
	/**
	 * 解析完成返回值
	 */
	private String message;
	
	@Before
	public void before()
	{
		service = new SomeService();
	} 
	
	@After
	public void after()
	{
		//控制檯資料返回訊息
		System.out.println(message);
	}
	
	/**
	 * 解析CSV檔案測試類
	 */
	@Test
	public void CSVAnalysisTest()
	{
		inPutPath = "C:\\Users\\test\\Desktop\\1.csv";
		outPathPath = "C:\\Users\\test\\Desktop\\1\\";
		typeId = 101;
		message = service.parse(inPutPath, outPathPath, typeId);
	}
	
	/**
	 * 解析Excel檔案測試類
	 */
	@Test
	public void ExcelAnalysisTest()
	{
		inPutPath = "C:\\Users\\test\\Desktop\\1.xlsx";
		outPathPath = "C:\\Users\\test\\Desktop\\1\\";
		typeId = 102;
		message = service.parse(inPutPath, outPathPath, typeId);
	}
	
	/**
	 * 解析XML檔案測試類
	 */
	@Test
	public void XMLAnalysisTest()
	{
		inPutPath = "C:\\Users\\test\\Desktop\\1.xml";
		outPathPath = "C:\\Users\\test\\Desktop\\1\\";
		typeId = 103;
		message = service.parse(inPutPath, outPathPath, typeId);
	}
}

十、結果

解析103型別的xml檔案，並返回成功解析條數
寫出Excel檔案
成功解析10條資料

解析101型別的CSV檔案，並返回成功解析條數
預設寫出CSV檔案
成功解析10條資料

解析102型別的xml檔案，並返回成功解析條數
預設寫出CSV檔案
成功解析10條資料