【实例简介】

【实例截图】

【核心代码】

package cn.part.com;

import java.io.BufferedInputStream;

import java.io.BufferedOutputStream;

import java.io.DataInputStream;

import java.io.DataOutputStream;

import java.io.File;

import java.io.FileInputStream;

import java.io.FileOutputStream;

public class LargeMappedFiles {

public static void splitFile(File file, int size,String path) throws Exception {

if (size <= 0) {

size = 1024;

}

if (!file.isFile()) {

throw new Exception("file not exists" path file.getName());

}

String filename = path file.getName();

File filetmp = new File(filename "_" 0 ".zip");

if (filetmp.isFile()) {

throw new Exception("file exists" path file.getName());

}

byte[] buf = new byte[1024 * 10];

FileInputStream fis = new FileInputStream(file);

int readsize = 0;

int pos = 0;

int k = 0;

int m = -1;

File fileout = null;

FileOutputStream fos = null;

while ((readsize = fis.read(buf, 0, buf.length)) > 0) {

if (k != m) {

if (fos != null) {

fos.close();

fos = null;

}

m = k;

fileout = new File(filename "_" k ".zip");

fos = new FileOutputStream(fileout);

}

fos.write(buf, 0, readsize);

fos.flush();

pos = readsize;

if (pos > size * (k 1)) {

k ;

}

}

if (fos != null) {

fos.close();

fos = null;

}

fis.close();

}

// 合并文件

public static void combination(File file) throws Exception {

String filename = file.getAbsolutePath();

File fileout = new File(filename);

if (fileout.isFile()) {

throw new Exception("file exists" fileout.getAbsolutePath());

}

FileOutputStream fos = new FileOutputStream(fileout);

int k = 0;

File filein = null;

FileInputStream fis = null;

byte[] buf = new byte[1024 * 10];

while (true) {

if (fis != null) {

fis.close();

fis = null;

}

filein = new File(filename "_" k ".zip");

if (!filein.isFile()) {

break;

}

fis = new FileInputStream(filein);

int readsize = 0;

while ((readsize = fis.read(buf, 0, buf.length)) > 0) {

fos.write(buf, 0, readsize);

fos.flush();

}

k ;

}

if (fis != null) {

fis.close();

fis = null;

}

fos.close();

}

public static void main(String[] args) throws Exception {

//splitFile(new File("E:\\downlaod\\c\\inventory.local.debug.zip"),4922765,"E:\\downlaod\\");

combination(new File("E:\\downlaod\\inventory.local.debug.zip"));

}

}