java分割文件并且合并文件(zip,rar....)

J***A分割文件，把一个ZIP文件通过指定的大小分割，然后合并起来。

分割

package com.zkq.objectstream;

import java.io.BufferedInputStream;

import java.io.BufferedOutputStream;

import java.io.File;

import java.io.FileInputStream;

import java.io.FileNotFoundException;

import java.io.FileOutputStream;

import java.io.IOException;

import java.io.InputStream;

import java.io.OutputStream;

public class HomeWork1 {

public static void main(String[] args) {

String srcName="D:\\apache-tomcat-7.0.40-windows-x86.zip";

String destName="E:\\temp\\";

int size=1;

System.out.println("开始分割文件");

split(srcName, size, destName);

System.out.println("文件分割完成");

}

private static void split(String src,int mb,String dest) {

// TODO 自动生成的方法存根

File srcFile=new File(src);

if(!srcFile.exists())

{

return;

}

long countSize=srcFile.length();

long fileSize=1024*1024*mb;

int num=0;

if(countSize%fileSize==0)

{

num=(int) (countSize/fileSize);

}

else

{

num=(int) (countSize/fileSize)+1;

}

InputStream in=null;

try {

in = new FileInputStream(srcFile);

BufferedInputStream bis=new BufferedInputStream(in);

BufferedOutputStream bos=null;

byte bytes[]=new byte[1024*1024];

int len=-1;

for (int i = 0; i < num; i++) {

String newFile=dest+File.separator+srcFile.getName()+"-"+i;

bos=new BufferedOutputStream(new FileOutputStream(newFile));

int count=0;

while ((len=bis.read(bytes))!=-1) {

bos.write(bytes,0,len);

bos.flush();

count+=len;

if(count>=fileSize)

{

break;

}



}

bos.close();

}

bis.close();

in.close();

} catch (FileNotFoundException e) {

// TODO 自动生成的 catch 块

e.printStackTrace();

} catch (IOException e) {

// TODO 自动生成的 catch 块

e.printStackTrace();

}



}

}

合并

package com.zkq.objectstream;

import java.io.BufferedInputStream;

import java.io.BufferedOutputStream;

import java.io.File;

import java.io.FileInputStream;

import java.io.FileNotFoundException;

import java.io.FileOutputStream;

import java.io.IOException;

public class HomeWork2 {

public static void main(String[] args) {

System.out.println("开始合并");

merge("E:\\temp", new File("E:\\temp\\apache-tomcat-7.0.40-windows-x86.zip-0"),new File("E:\\temp\\apache-tomcat-7.0.40-windows-x86.zip-1"),

new File("E:\\temp\\apache-tomcat-7.0.40-windows-x86.zip-2"),

new File("E:\\temp\\apache-tomcat-7.0.40-windows-x86.zip-3"),

new File("E:\\temp\\apache-tomcat-7.0.40-windows-x86.zip-4"),

new File("E:\\temp\\apache-tomcat-7.0.40-windows-x86.zip-5"),

new File("E:\\temp\\apache-tomcat-7.0.40-windows-x86.zip-6"),

new File("E:\\temp\\apache-tomcat-7.0.40-windows-x86.zip-7"),new File("E:\\temp\\apache-tomcat-7.0.40-windows-x86.zip-8"));

System.out.println("合并成功");

}

private static void merge(String dest,File... files) {

// TODO 自动生成的方法存根

String filename=files[0].getName();

filename=files[0].getName().substring(0,filename.lastIndexOf("-"));

try {

BufferedOutputStream bos=new BufferedOutputStream(new FileOutputStream(dest+File.separator+filename));

BufferedInputStream bis=null;

byte bytes[]=new byte[1024*1024];

int len=-1;

for(int i=0;i<files.length;i++)

{

bis=new BufferedInputStream(new FileInputStream(files[i]));

while ((len=bis.read(bytes))!=-1) {

bos.write(bytes, 0, len);

}

}

} catch (FileNotFoundException e) {

// TODO 自动生成的 catch 块

e.printStackTrace();

} catch (IOException e) {

// TODO 自动生成的 catch 块

e.printStackTrace();

}



}

}