文件传输 博客分类： java基础 文件传输

将文件转换为二进制的文件，并将二进制写进文件

package ceshiOA;

import java.io.BufferedWriter;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStreamWriter;
import java.nio.ByteBuffer;
import java.util.Arrays;


public class Test {
	public static void main(String[] args) {doIt(5);}
	private static void doIt(int t){

		Test test = new Test();
		byte[] buffers =test.file2byte(new File("res/DocumentManager.rar"));
		OutputStreamWriter writer = null ;
		try{
			
			int num = buffers.length %t == 0 ? buffers.length /t : buffers.length/t+1;
			for(int j = 0 ; j < t ; j ++){
				writer = new OutputStreamWriter(new FileOutputStream("res/ProjectFiles/bytenumber("+j+").txt" , false) , "utf-8");
				if(j == t-1){
					byte[] buffer = new byte[buffers.length - num*j] ;
					System.arraycopy(buffers, num*j, buffer, 0, buffer.length);
					int forNum = buffer.length %1024 == 0 ? buffer.length /1024 : buffer.length/1024+1;
					for(int i= 0 ; i < forNum  ; i++){
						if(i == buffer.length/1024){
							byte[] bu = new byte[buffer.length-i*1024] ;
							System.arraycopy(buffer, i*1024, bu, 0, bu.length);
							String str = Arrays.toString(bu).replaceAll(", ", " ");
							writer.write(str.substring(1,str.length()-1));
						}else{
							byte[] bu = new byte[1024] ;
							System.arraycopy(buffer, i*1024, bu, 0, bu.length);
							String str = Arrays.toString(bu).replaceAll(", ", " ");
							writer.write(str.substring(1,str.length()-1));
//							writer.write(byte2string(bu));
						}
						writer.write("\r\n");
						writer.flush();
					}
				}else{
					byte[] buffer = new byte[num] ;
					System.arraycopy(buffers, num*j, buffer, 0, num);
					int forNum = buffer.length %1024 == 0 ? buffer.length /1024 : buffer.length/1024+1;
					for(int i= 0 ; i < forNum  ; i++){
						if(i == buffer.length/1024){
							byte[] bu = new byte[buffer.length-i*1024] ;
							System.arraycopy(buffer, i*1024, bu, 0, bu.length);
							String str = Arrays.toString(bu).replaceAll(", ", " ");
							writer.write(str.substring(1,str.length()-1));
						}else{
							byte[] bu = new byte[1024] ;
							System.arraycopy(buffer, i*1024, bu, 0, bu.length);
							String str = Arrays.toString(bu).replaceAll(", ", " ");
							writer.write(str.substring(1,str.length()-1));
//							writer.write(byte2string(bu));
						}
						writer.write("\r\n");
						writer.flush();
					}
				}
				 
				writer.flush();
			}
			
			writer.flush();
		}
		catch(Exception e){}
		test.byte2File(buffers);
		
	
	}
	
	private static String byte2string(byte[] buffer){
		StringBuilder sb = new StringBuilder();
		for(byte b : buffer){
			sb.append(" "+b);
		}
		return sb.toString();
	}
	private void byte2File(byte[] buffer){
		FileOutputStream os = null ; 
		try{
			os = new FileOutputStream(new File("res/copyFile.rar"));
			os.write(buffer);
			os.flush();
		}
		catch(Exception e){}
		finally{
			if(os != null ){
				try {
					os.close() ;
				} catch (IOException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				}
			}
		}
	}
	private byte[] file2byte(File file){
		FileInputStream os = null ;
		ByteBuffer buffer = ByteBuffer.allocate(10485760*20) ;
		try{
			
			os = new FileInputStream(file);
			byte[] byBuffer = new byte[1024] ;
			int length = 0 ;
			while((length = os.read(byBuffer)) != -1){
				byte[] putb = new byte[length];
				System.arraycopy(byBuffer, 0, putb, 0, length);
				buffer.put(putb);
			}
			buffer.flip();
			byte[] result =  new byte[buffer.limit()] ;
			System.arraycopy(buffer.array(), 0, result, 0, result.length);
			return result;
		}
		catch(Exception e){
			return new byte[1] ;
		}
		finally{
			if(os!=null){
				try {
					os.close();
				} catch (IOException e) {
					e.printStackTrace();
				}
			}
				
		}
	}
}

 将二进制的文件还原为原文件

package ceshiOA;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;

public class Binarry2File {
	public static void main(String[] args) {
		new Binarry2File().getFiles("res/ProjectFiles/", "res/project.rar");
	}
	
	public void getFiles(String dirs , String saveFile){
		File[] files = new File(dirs).listFiles();
		BufferedReader reader = null ;
		FileOutputStream os = null ;
		
		for(File file : files){
			try {
				os = new FileOutputStream(saveFile,true);
			} catch (FileNotFoundException e1) {
				// TODO Auto-generated catch block
				e1.printStackTrace();
			}
			System.out.println(file.getName());
			try{
				reader = new BufferedReader(new InputStreamReader(new FileInputStream(file),"utf-8"));
				String str = null ; 
				while((str = reader.readLine()) != null){
					String[] strs = str.split(" ");
					byte[] buffer =new byte[strs.length];
					for(int i = 0 ; i < strs.length ; i ++){
						buffer[i] = Byte.parseByte(strs[i]);
					}
					System.out.println(str);
					os.write(buffer);
				}
				os.flush();
			}
			catch(Exception e ){
				e.printStackTrace();
			}
			finally{
				if(reader!=null){
					try {
						reader.close();
					} catch (IOException e) {
						e.printStackTrace();
					}
				}
				if(os != null ){
					try {
						os.close();
					} catch (IOException e) {
						// TODO Auto-generated catch block
						e.printStackTrace();
					}
				}
			}
		}
		
	}
}