materialexport.java

物料管理 物料登记 批量登记：一次性导入多条物料 单条登记：只能录入一条物料信息 物料管理 更新： 删除： 查看： 物料导出 库管员可以将系统中登记的所有物料一次性导出来 Mat

package com.qrsx.storage.view;

import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.nio.channels.FileChannel;
import java.util.ArrayList;
import java.util.List;
import java.nio.ByteBuffer;

import com.qrsx.storage.manager.MaterialManager;
import com.qrsx.storage.model.Material;


public class MaterialExport { 
	private MaterialManager materialManager;
	private String filePath;
	public MaterialExport(MaterialManager mm,String filePath){
		this.filePath=filePath;
		this.materialManager=mm;
	}
	private int writerToFile(StringBuffer sb) throws FileNotFoundException{
		FileOutputStream out=new FileOutputStream(filePath,true);
		FileChannel fic=out.getChannel();
		ByteBuffer bb=ByteBuffer.allocate(1024);
		//String b=new String(sb.toString().getBytes());
		String b=sb.toString();
		byte[] bt=b.getBytes();
		bb.put(bt);
		try{
			bb.flip();
			fic.write(bb);
			bb.clear();
		}catch(IOException e){
			e.printStackTrace();
		}
		
		return 0;
	}
	private StringBuffer parseMaterialTOString(List<Material> materials){
		Material material=new Material();
		StringBuffer sb=new StringBuffer();
		sb.append("id"+"\t~"+"name"+"\t~"+"client"+"\t~"+"unit"+"\t~"+"price"+"\t~"+"total"+"\t~"+"note"+"\n");
		for(int i=0;i<materials.size();i++){
			material=materials.get(i);
			sb.append(String.valueOf(material.getId())+"\t~");
			sb.append(String.valueOf(material.getName())+"\t~");
			sb.append(String.valueOf(material.getClient())+"\t~");
			sb.append(String.valueOf(material.getUnit())+"\t~");
			sb.append(String.valueOf(material.getPrice())+"\t~");
			sb.append(String.valueOf(material.getTotal())+"\t~");
			sb.append(String.valueOf(material.getNote())+"\n");
			
		}
		
		return sb;
	}
	public void importFile() throws FileNotFoundException{
		List<Material> list=new ArrayList<Material>();
		list=materialManager.readAll();
		StringBuffer sb=parseMaterialTOString(list);
		writerToFile(sb);
	}
	public static void main(String[] args) throws FileNotFoundException{
		String filePath="E:\\java\\storage\\src\\Material.txt";
		MaterialManager mm=new MaterialManager();
		MaterialExport mi=new MaterialExport(mm,filePath);
		mi.importFile();
		System.out.println("ok");
	}
	
}